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