include/linux/memblock.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef _LINUX_MEMBLOCK_H
   3 #define _LINUX_MEMBLOCK_H
   4 #ifdef __KERNEL__
   5
   6 /*
   7  * Logical memory blocks.
   8  *
   9  * Copyright (C) 2001 Peter Bergner, IBM Corp.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/mm.h>
  14 #include <asm/dma.h>
  15
  16 extern unsigned long max_low_pfn;
  17 extern unsigned long min_low_pfn;
  18
  19 /*
  20  * highest page
  21  */
  22 extern unsigned long max_pfn;
  23 /*
  24  * highest possible page
  25  */
  26 extern unsigned long long max_possible_pfn;
  27
  28 /**
  29  * enum memblock_flags - definition of memory region attributes
  30  * @MEMBLOCK_NONE: no special request
  31  * @MEMBLOCK_HOTPLUG: hotpluggable region
  32  * @MEMBLOCK_MIRROR: mirrored region
  33  * @MEMBLOCK_NOMAP: don't add to kernel direct mapping
  34  */
  35 enum memblock_flags {
  36         MEMBLOCK_NONE           = 0x0,  /* No special request */
  37         MEMBLOCK_HOTPLUG        = 0x1,  /* hotpluggable region */
  38         MEMBLOCK_MIRROR         = 0x2,  /* mirrored region */
  39         MEMBLOCK_NOMAP          = 0x4,  /* don't add to kernel direct mapping */
  40 };
  41
  42 /**
  43  * struct memblock_region - represents a memory region
  44  * @base: base address of the region
  45  * @size: size of the region
  46  * @flags: memory region attributes
  47  * @nid: NUMA node id
  48  */
  49 struct memblock_region {
  50         phys_addr_t base;
  51         phys_addr_t size;
  52         enum memblock_flags flags;
  53 #ifdef CONFIG_NEED_MULTIPLE_NODES
  54         int nid;
  55 #endif
  56 };
  57
  58 /**
  59  * struct memblock_type - collection of memory regions of certain type
  60  * @cnt: number of regions
  61  * @max: size of the allocated array
  62  * @total_size: size of all regions
  63  * @regions: array of regions
  64  * @name: the memory type symbolic name
  65  */
  66 struct memblock_type {
  67         unsigned long cnt;
  68         unsigned long max;
  69         phys_addr_t total_size;
  70         struct memblock_region *regions;
  71         char *name;
  72 };
  73
  74 /**
  75  * struct memblock - memblock allocator metadata
  76  * @bottom_up: is bottom up direction?
  77  * @current_limit: physical address of the current allocation limit
  78  * @memory: usable memory regions
  79  * @reserved: reserved memory regions
  80  */
  81 struct memblock {
  82         bool bottom_up;  /* is bottom up direction? */
  83         phys_addr_t current_limit;
  84         struct memblock_type memory;
  85         struct memblock_type reserved;
  86 };
  87
  88 extern struct memblock memblock;
  89
  90 #ifndef CONFIG_ARCH_KEEP_MEMBLOCK
  91 #define __init_memblock __meminit
  92 #define __initdata_memblock __meminitdata
  93 void memblock_discard(void);
  94 #else
  95 #define __init_memblock
  96 #define __initdata_memblock
  97 static inline void memblock_discard(void) {}
  98 #endif
  99
 100 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
 101                                    phys_addr_t size, phys_addr_t align);
 102 void memblock_allow_resize(void);
 103 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
 104 int memblock_add(phys_addr_t base, phys_addr_t size);
 105 int memblock_remove(phys_addr_t base, phys_addr_t size);
 106 int memblock_free(phys_addr_t base, phys_addr_t size);
 107 int memblock_reserve(phys_addr_t base, phys_addr_t size);
 108 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
 109 int memblock_physmem_add(phys_addr_t base, phys_addr_t size);
 110 #endif
 111 void memblock_trim_memory(phys_addr_t align);
 112 bool memblock_overlaps_region(struct memblock_type *type,
 113                               phys_addr_t base, phys_addr_t size);
 114 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
 115 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
 116 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
 117 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
 118 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
 119
 120 void memblock_free_all(void);
 121 void reset_node_managed_pages(pg_data_t *pgdat);
 122 void reset_all_zones_managed_pages(void);
 123
 124 /* Low level functions */
 125 void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags,
 126                       struct memblock_type *type_a,
 127                       struct memblock_type *type_b, phys_addr_t *out_start,
 128                       phys_addr_t *out_end, int *out_nid);
 129
 130 void __next_mem_range_rev(u64 *idx, int nid, enum memblock_flags flags,
 131                           struct memblock_type *type_a,
 132                           struct memblock_type *type_b, phys_addr_t *out_start,
 133                           phys_addr_t *out_end, int *out_nid);
 134
 135 void __memblock_free_late(phys_addr_t base, phys_addr_t size);
 136
 137 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
 138 static inline void __next_physmem_range(u64 *idx, struct memblock_type *type,
 139                                         phys_addr_t *out_start,
 140                                         phys_addr_t *out_end)
 141 {
 142         extern struct memblock_type physmem;
 143
 144         __next_mem_range(idx, NUMA_NO_NODE, MEMBLOCK_NONE, &physmem, type,
 145                          out_start, out_end, NULL);
 146 }
 147
 148 /**
 149  * for_each_physmem_range - iterate through physmem areas not included in type.
 150  * @i: u64 used as loop variable
 151  * @type: ptr to memblock_type which excludes from the iteration, can be %NULL
 152  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 153  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 154  */
 155 #define for_each_physmem_range(i, type, p_start, p_end)                 \
 156         for (i = 0, __next_physmem_range(&i, type, p_start, p_end);     \
 157              i != (u64)ULLONG_MAX;                                      \
 158              __next_physmem_range(&i, type, p_start, p_end))
 159 #endif /* CONFIG_HAVE_MEMBLOCK_PHYS_MAP */
 160
 161 /**
 162  * __for_each_mem_range - iterate through memblock areas from type_a and not
 163  * included in type_b. Or just type_a if type_b is NULL.
 164  * @i: u64 used as loop variable
 165  * @type_a: ptr to memblock_type to iterate
 166  * @type_b: ptr to memblock_type which excludes from the iteration
 167  * @nid: node selector, %NUMA_NO_NODE for all nodes
 168  * @flags: pick from blocks based on memory attributes
 169  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 170  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 171  * @p_nid: ptr to int for nid of the range, can be %NULL
 172  */
 173 #define __for_each_mem_range(i, type_a, type_b, nid, flags,             \
 174                            p_start, p_end, p_nid)                       \
 175         for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b,    \
 176                                      p_start, p_end, p_nid);            \
 177              i != (u64)ULLONG_MAX;                                      \
 178              __next_mem_range(&i, nid, flags, type_a, type_b,           \
 179                               p_start, p_end, p_nid))
 180
 181 /**
 182  * __for_each_mem_range_rev - reverse iterate through memblock areas from
 183  * type_a and not included in type_b. Or just type_a if type_b is NULL.
 184  * @i: u64 used as loop variable
 185  * @type_a: ptr to memblock_type to iterate
 186  * @type_b: ptr to memblock_type which excludes from the iteration
 187  * @nid: node selector, %NUMA_NO_NODE for all nodes
 188  * @flags: pick from blocks based on memory attributes
 189  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 190  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 191  * @p_nid: ptr to int for nid of the range, can be %NULL
 192  */
 193 #define __for_each_mem_range_rev(i, type_a, type_b, nid, flags,         \
 194                                  p_start, p_end, p_nid)                 \
 195         for (i = (u64)ULLONG_MAX,                                       \
 196                      __next_mem_range_rev(&i, nid, flags, type_a, type_b, \
 197                                           p_start, p_end, p_nid);       \
 198              i != (u64)ULLONG_MAX;                                      \
 199              __next_mem_range_rev(&i, nid, flags, type_a, type_b,       \
 200                                   p_start, p_end, p_nid))
 201
 202 /**
 203  * for_each_mem_range - iterate through memory areas.
 204  * @i: u64 used as loop variable
 205  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 206  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 207  */
 208 #define for_each_mem_range(i, p_start, p_end) \
 209         __for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE,   \
 210                              MEMBLOCK_NONE, p_start, p_end, NULL)
 211
 212 /**
 213  * for_each_mem_range_rev - reverse iterate through memblock areas from
 214  * type_a and not included in type_b. Or just type_a if type_b is NULL.
 215  * @i: u64 used as loop variable
 216  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 217  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 218  */
 219 #define for_each_mem_range_rev(i, p_start, p_end)                       \
 220         __for_each_mem_range_rev(i, &memblock.memory, NULL, NUMA_NO_NODE, \
 221                                  MEMBLOCK_NONE, p_start, p_end, NULL)
 222
 223 /**
 224  * for_each_reserved_mem_range - iterate over all reserved memblock areas
 225  * @i: u64 used as loop variable
 226  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 227  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 228  *
 229  * Walks over reserved areas of memblock. Available as soon as memblock
 230  * is initialized.
 231  */
 232 #define for_each_reserved_mem_range(i, p_start, p_end)                  \
 233         __for_each_mem_range(i, &memblock.reserved, NULL, NUMA_NO_NODE, \
 234                              MEMBLOCK_NONE, p_start, p_end, NULL)
 235
 236 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
 237 {
 238         return m->flags & MEMBLOCK_HOTPLUG;
 239 }
 240
 241 static inline bool memblock_is_mirror(struct memblock_region *m)
 242 {
 243         return m->flags & MEMBLOCK_MIRROR;
 244 }
 245
 246 static inline bool memblock_is_nomap(struct memblock_region *m)
 247 {
 248         return m->flags & MEMBLOCK_NOMAP;
 249 }
 250
 251 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
 252                             unsigned long  *end_pfn);
 253 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
 254                           unsigned long *out_end_pfn, int *out_nid);
 255
 256 /**
 257  * for_each_mem_pfn_range - early memory pfn range iterator
 258  * @i: an integer used as loop variable
 259  * @nid: node selector, %MAX_NUMNODES for all nodes
 260  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
 261  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
 262  * @p_nid: ptr to int for nid of the range, can be %NULL
 263  *
 264  * Walks over configured memory ranges.
 265  */
 266 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)           \
 267         for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 268              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
 269
 270 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
 271 void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
 272                                   unsigned long *out_spfn,
 273                                   unsigned long *out_epfn);
 274 /**
 275  * for_each_free_mem_pfn_range_in_zone - iterate through zone specific free
 276  * memblock areas
 277  * @i: u64 used as loop variable
 278  * @zone: zone in which all of the memory blocks reside
 279  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 280  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 281  *
 282  * Walks over free (memory && !reserved) areas of memblock in a specific
 283  * zone. Available once memblock and an empty zone is initialized. The main
 284  * assumption is that the zone start, end, and pgdat have been associated.
 285  * This way we can use the zone to determine NUMA node, and if a given part
 286  * of the memblock is valid for the zone.
 287  */
 288 #define for_each_free_mem_pfn_range_in_zone(i, zone, p_start, p_end)    \
 289         for (i = 0,                                                     \
 290              __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end);    \
 291              i != U64_MAX;                                      \
 292              __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
 293
 294 /**
 295  * for_each_free_mem_pfn_range_in_zone_from - iterate through zone specific
 296  * free memblock areas from a given point
 297  * @i: u64 used as loop variable
 298  * @zone: zone in which all of the memory blocks reside
 299  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 300  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 301  *
 302  * Walks over free (memory && !reserved) areas of memblock in a specific
 303  * zone, continuing from current position. Available as soon as memblock is
 304  * initialized.
 305  */
 306 #define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \
 307         for (; i != U64_MAX;                                      \
 308              __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
 309
 310 int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask);
 311
 312 #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
 313
 314 /**
 315  * for_each_free_mem_range - iterate through free memblock areas
 316  * @i: u64 used as loop variable
 317  * @nid: node selector, %NUMA_NO_NODE for all nodes
 318  * @flags: pick from blocks based on memory attributes
 319  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 320  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 321  * @p_nid: ptr to int for nid of the range, can be %NULL
 322  *
 323  * Walks over free (memory && !reserved) areas of memblock.  Available as
 324  * soon as memblock is initialized.
 325  */
 326 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid)   \
 327         __for_each_mem_range(i, &memblock.memory, &memblock.reserved,   \
 328                              nid, flags, p_start, p_end, p_nid)
 329
 330 /**
 331  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
 332  * @i: u64 used as loop variable
 333  * @nid: node selector, %NUMA_NO_NODE for all nodes
 334  * @flags: pick from blocks based on memory attributes
 335  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 336  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 337  * @p_nid: ptr to int for nid of the range, can be %NULL
 338  *
 339  * Walks over free (memory && !reserved) areas of memblock in reverse
 340  * order.  Available as soon as memblock is initialized.
 341  */
 342 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end,  \
 343                                         p_nid)                          \
 344         __for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
 345                                  nid, flags, p_start, p_end, p_nid)
 346
 347 int memblock_set_node(phys_addr_t base, phys_addr_t size,
 348                       struct memblock_type *type, int nid);
 349
 350 #ifdef CONFIG_NEED_MULTIPLE_NODES
 351 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 352 {
 353         r->nid = nid;
 354 }
 355
 356 static inline int memblock_get_region_node(const struct memblock_region *r)
 357 {
 358         return r->nid;
 359 }
 360 #else
 361 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 362 {
 363 }
 364
 365 static inline int memblock_get_region_node(const struct memblock_region *r)
 366 {
 367         return 0;
 368 }
 369 #endif /* CONFIG_NEED_MULTIPLE_NODES */
 370
 371 /* Flags for memblock allocation APIs */
 372 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 373 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 374 #define MEMBLOCK_ALLOC_KASAN            1
 375
 376 /* We are using top down, so it is safe to use 0 here */
 377 #define MEMBLOCK_LOW_LIMIT 0
 378
 379 #ifndef ARCH_LOW_ADDRESS_LIMIT
 380 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 381 #endif
 382
 383 phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align,
 384                                       phys_addr_t start, phys_addr_t end);
 385 phys_addr_t memblock_alloc_range_nid(phys_addr_t size,
 386                                       phys_addr_t align, phys_addr_t start,
 387                                       phys_addr_t end, int nid, bool exact_nid);
 388 phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 389
 390 static inline phys_addr_t memblock_phys_alloc(phys_addr_t size,
 391                                               phys_addr_t align)
 392 {
 393         return memblock_phys_alloc_range(size, align, 0,
 394                                          MEMBLOCK_ALLOC_ACCESSIBLE);
 395 }
 396
 397 void *memblock_alloc_exact_nid_raw(phys_addr_t size, phys_addr_t align,
 398                                  phys_addr_t min_addr, phys_addr_t max_addr,
 399                                  int nid);
 400 void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align,
 401                                  phys_addr_t min_addr, phys_addr_t max_addr,
 402                                  int nid);
 403 void *memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
 404                              phys_addr_t min_addr, phys_addr_t max_addr,
 405                              int nid);
 406
 407 static __always_inline void *memblock_alloc(phys_addr_t size, phys_addr_t align)
 408 {
 409         return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
 410                                       MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
 411 }
 412
 413 static inline void *memblock_alloc_raw(phys_addr_t size,
 414                                                phys_addr_t align)
 415 {
 416         return memblock_alloc_try_nid_raw(size, align, MEMBLOCK_LOW_LIMIT,
 417                                           MEMBLOCK_ALLOC_ACCESSIBLE,
 418                                           NUMA_NO_NODE);
 419 }
 420
 421 static inline void *memblock_alloc_from(phys_addr_t size,
 422                                                 phys_addr_t align,
 423                                                 phys_addr_t min_addr)
 424 {
 425         return memblock_alloc_try_nid(size, align, min_addr,
 426                                       MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
 427 }
 428
 429 static inline void *memblock_alloc_low(phys_addr_t size,
 430                                                phys_addr_t align)
 431 {
 432         return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
 433                                       ARCH_LOW_ADDRESS_LIMIT, NUMA_NO_NODE);
 434 }
 435
 436 static inline void *memblock_alloc_node(phys_addr_t size,
 437                                                 phys_addr_t align, int nid)
 438 {
 439         return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
 440                                       MEMBLOCK_ALLOC_ACCESSIBLE, nid);
 441 }
 442
 443 static inline void memblock_free_early(phys_addr_t base,
 444                                               phys_addr_t size)
 445 {
 446         memblock_free(base, size);
 447 }
 448
 449 static inline void memblock_free_early_nid(phys_addr_t base,
 450                                                   phys_addr_t size, int nid)
 451 {
 452         memblock_free(base, size);
 453 }
 454
 455 static inline void memblock_free_late(phys_addr_t base, phys_addr_t size)
 456 {
 457         __memblock_free_late(base, size);
 458 }
 459
 460 /*
 461  * Set the allocation direction to bottom-up or top-down.
 462  */
 463 static inline __init_memblock void memblock_set_bottom_up(bool enable)
 464 {
 465         memblock.bottom_up = enable;
 466 }
 467
 468 /*
 469  * Check if the allocation direction is bottom-up or not.
 470  * if this is true, that said, memblock will allocate memory
 471  * in bottom-up direction.
 472  */
 473 static inline __init_memblock bool memblock_bottom_up(void)
 474 {
 475         return memblock.bottom_up;
 476 }
 477
 478 phys_addr_t memblock_phys_mem_size(void);
 479 phys_addr_t memblock_reserved_size(void);
 480 phys_addr_t memblock_start_of_DRAM(void);
 481 phys_addr_t memblock_end_of_DRAM(void);
 482 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 483 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
 484 void memblock_mem_limit_remove_map(phys_addr_t limit);
 485 bool memblock_is_memory(phys_addr_t addr);
 486 bool memblock_is_map_memory(phys_addr_t addr);
 487 bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 488 bool memblock_is_reserved(phys_addr_t addr);
 489 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 490
 491 void memblock_dump_all(void);
 492
 493 /**
 494  * memblock_set_current_limit - Set the current allocation limit to allow
 495  *                         limiting allocations to what is currently
 496  *                         accessible during boot
 497  * @limit: New limit value (physical address)
 498  */
 499 void memblock_set_current_limit(phys_addr_t limit);
 500
 501
 502 phys_addr_t memblock_get_current_limit(void);
 503
 504 /*
 505  * pfn conversion functions
 506  *
 507  * While the memory MEMBLOCKs should always be page aligned, the reserved
 508  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 509  * idea of what they return for such non aligned MEMBLOCKs.
 510  */
 511
 512 /**
 513  * memblock_region_memory_base_pfn - get the lowest pfn of the memory region
 514  * @reg: memblock_region structure
 515  *
 516  * Return: the lowest pfn intersecting with the memory region
 517  */
 518 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 519 {
 520         return PFN_UP(reg->base);
 521 }
 522
 523 /**
 524  * memblock_region_memory_end_pfn - get the end pfn of the memory region
 525  * @reg: memblock_region structure
 526  *
 527  * Return: the end_pfn of the reserved region
 528  */
 529 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 530 {
 531         return PFN_DOWN(reg->base + reg->size);
 532 }
 533
 534 /**
 535  * memblock_region_reserved_base_pfn - get the lowest pfn of the reserved region
 536  * @reg: memblock_region structure
 537  *
 538  * Return: the lowest pfn intersecting with the reserved region
 539  */
 540 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 541 {
 542         return PFN_DOWN(reg->base);
 543 }
 544
 545 /**
 546  * memblock_region_reserved_end_pfn - get the end pfn of the reserved region
 547  * @reg: memblock_region structure
 548  *
 549  * Return: the end_pfn of the reserved region
 550  */
 551 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 552 {
 553         return PFN_UP(reg->base + reg->size);
 554 }
 555
 556 /**
 557  * for_each_mem_region - itereate over memory regions
 558  * @region: loop variable
 559  */
 560 #define for_each_mem_region(region)                                     \
 561         for (region = memblock.memory.regions;                          \
 562              region < (memblock.memory.regions + memblock.memory.cnt);  \
 563              region++)
 564
 565 /**
 566  * for_each_reserved_mem_region - itereate over reserved memory regions
 567  * @region: loop variable
 568  */
 569 #define for_each_reserved_mem_region(region)                            \
 570         for (region = memblock.reserved.regions;                        \
 571              region < (memblock.reserved.regions + memblock.reserved.cnt); \
 572              region++)
 573
 574 extern void *alloc_large_system_hash(const char *tablename,
 575                                      unsigned long bucketsize,
 576                                      unsigned long numentries,
 577                                      int scale,
 578                                      int flags,
 579                                      unsigned int *_hash_shift,
 580                                      unsigned int *_hash_mask,
 581                                      unsigned long low_limit,
 582                                      unsigned long high_limit);
 583
 584 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 585 #define HASH_SMALL      0x00000002      /* sub-page allocation allowed, min
 586                                          * shift passed via *_hash_shift */
 587 #define HASH_ZERO       0x00000004      /* Zero allocated hash table */
 588
 589 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
 590  * sufficient vmalloc space.
 591  */
 592 #ifdef CONFIG_NUMA
 593 #define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT)
 594 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 595 #else
 596 #define hashdist (0)
 597 #endif
 598
 599 #ifdef CONFIG_MEMTEST
 600 extern void early_memtest(phys_addr_t start, phys_addr_t end);
 601 #else
 602 static inline void early_memtest(phys_addr_t start, phys_addr_t end)
 603 {
 604 }
 605 #endif
 606
 607 #endif /* __KERNEL__ */
 608
 609 #endif /* _LINUX_MEMBLOCK_H */