include/linux/memblock.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef _LINUX_MEMBLOCK_H
   3 #define _LINUX_MEMBLOCK_H
   4
   5 /*
   6  * Logical memory blocks.
   7  *
   8  * Copyright (C) 2001 Peter Bergner, IBM Corp.
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/mm.h>
  13 #include <asm/dma.h>
  14
  15 extern unsigned long max_low_pfn;
  16 extern unsigned long min_low_pfn;
  17
  18 /*
  19  * highest page
  20  */
  21 extern unsigned long max_pfn;
  22 /*
  23  * highest possible page
  24  */
  25 extern unsigned long long max_possible_pfn;
  26
  27 /**
  28  * enum memblock_flags - definition of memory region attributes
  29  * @MEMBLOCK_NONE: no special request
  30  * @MEMBLOCK_HOTPLUG: memory region indicated in the firmware-provided memory
  31  * map during early boot as hot(un)pluggable system RAM (e.g., memory range
  32  * that might get hotunplugged later). With "movable_node" set on the kernel
  33  * commandline, try keeping this memory region hotunpluggable. Does not apply
  34  * to memblocks added ("hotplugged") after early boot.
  35  * @MEMBLOCK_MIRROR: mirrored region
  36  * @MEMBLOCK_NOMAP: don't add to kernel direct mapping and treat as
  37  * reserved in the memory map; refer to memblock_mark_nomap() description
  38  * for further details
  39  * @MEMBLOCK_DRIVER_MANAGED: memory region that is always detected and added
  40  * via a driver, and never indicated in the firmware-provided memory map as
  41  * system RAM. This corresponds to IORESOURCE_SYSRAM_DRIVER_MANAGED in the
  42  * kernel resource tree.
  43  * @MEMBLOCK_RSRV_NOINIT: memory region for which struct pages are
  44  * not initialized (only for reserved regions).
  45  */
  46 enum memblock_flags {
  47         MEMBLOCK_NONE           = 0x0,  /* No special request */
  48         MEMBLOCK_HOTPLUG        = 0x1,  /* hotpluggable region */
  49         MEMBLOCK_MIRROR         = 0x2,  /* mirrored region */
  50         MEMBLOCK_NOMAP          = 0x4,  /* don't add to kernel direct mapping */
  51         MEMBLOCK_DRIVER_MANAGED = 0x8,  /* always detected via a driver */
  52         MEMBLOCK_RSRV_NOINIT    = 0x10, /* don't initialize struct pages */
  53 };
  54
  55 /**
  56  * struct memblock_region - represents a memory region
  57  * @base: base address of the region
  58  * @size: size of the region
  59  * @flags: memory region attributes
  60  * @nid: NUMA node id
  61  */
  62 struct memblock_region {
  63         phys_addr_t base;
  64         phys_addr_t size;
  65         enum memblock_flags flags;
  66 #ifdef CONFIG_NUMA
  67         int nid;
  68 #endif
  69 };
  70
  71 /**
  72  * struct memblock_type - collection of memory regions of certain type
  73  * @cnt: number of regions
  74  * @max: size of the allocated array
  75  * @total_size: size of all regions
  76  * @regions: array of regions
  77  * @name: the memory type symbolic name
  78  */
  79 struct memblock_type {
  80         unsigned long cnt;
  81         unsigned long max;
  82         phys_addr_t total_size;
  83         struct memblock_region *regions;
  84         char *name;
  85 };
  86
  87 /**
  88  * struct memblock - memblock allocator metadata
  89  * @bottom_up: is bottom up direction?
  90  * @current_limit: physical address of the current allocation limit
  91  * @memory: usable memory regions
  92  * @reserved: reserved memory regions
  93  */
  94 struct memblock {
  95         bool bottom_up;  /* is bottom up direction? */
  96         phys_addr_t current_limit;
  97         struct memblock_type memory;
  98         struct memblock_type reserved;
  99 };
 100
 101 extern struct memblock memblock;
 102
 103 #ifndef CONFIG_ARCH_KEEP_MEMBLOCK
 104 #define __init_memblock __meminit
 105 #define __initdata_memblock __meminitdata
 106 void memblock_discard(void);
 107 #else
 108 #define __init_memblock
 109 #define __initdata_memblock
 110 static inline void memblock_discard(void) {}
 111 #endif
 112
 113 void memblock_allow_resize(void);
 114 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid,
 115                       enum memblock_flags flags);
 116 int memblock_add(phys_addr_t base, phys_addr_t size);
 117 int memblock_remove(phys_addr_t base, phys_addr_t size);
 118 int memblock_phys_free(phys_addr_t base, phys_addr_t size);
 119 int memblock_reserve(phys_addr_t base, phys_addr_t size);
 120 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
 121 int memblock_physmem_add(phys_addr_t base, phys_addr_t size);
 122 #endif
 123 void memblock_trim_memory(phys_addr_t align);
 124 unsigned long memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
 125                                      phys_addr_t base2, phys_addr_t size2);
 126 bool memblock_overlaps_region(struct memblock_type *type,
 127                               phys_addr_t base, phys_addr_t size);
 128 bool memblock_validate_numa_coverage(unsigned long threshold_bytes);
 129 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
 130 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
 131 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
 132 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
 133 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
 134 int memblock_reserved_mark_noinit(phys_addr_t base, phys_addr_t size);
 135
 136 void memblock_free_all(void);
 137 void memblock_free(void *ptr, size_t size);
 138 void reset_all_zones_managed_pages(void);
 139
 140 /* Low level functions */
 141 void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags,
 142                       struct memblock_type *type_a,
 143                       struct memblock_type *type_b, phys_addr_t *out_start,
 144                       phys_addr_t *out_end, int *out_nid);
 145
 146 void __next_mem_range_rev(u64 *idx, int nid, enum memblock_flags flags,
 147                           struct memblock_type *type_a,
 148                           struct memblock_type *type_b, phys_addr_t *out_start,
 149                           phys_addr_t *out_end, int *out_nid);
 150
 151 void memblock_free_late(phys_addr_t base, phys_addr_t size);
 152
 153 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
 154 static inline void __next_physmem_range(u64 *idx, struct memblock_type *type,
 155                                         phys_addr_t *out_start,
 156                                         phys_addr_t *out_end)
 157 {
 158         extern struct memblock_type physmem;
 159
 160         __next_mem_range(idx, NUMA_NO_NODE, MEMBLOCK_NONE, &physmem, type,
 161                          out_start, out_end, NULL);
 162 }
 163
 164 /**
 165  * for_each_physmem_range - iterate through physmem areas not included in type.
 166  * @i: u64 used as loop variable
 167  * @type: ptr to memblock_type which excludes from the iteration, can be %NULL
 168  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 169  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 170  */
 171 #define for_each_physmem_range(i, type, p_start, p_end)                 \
 172         for (i = 0, __next_physmem_range(&i, type, p_start, p_end);     \
 173              i != (u64)ULLONG_MAX;                                      \
 174              __next_physmem_range(&i, type, p_start, p_end))
 175 #endif /* CONFIG_HAVE_MEMBLOCK_PHYS_MAP */
 176
 177 /**
 178  * __for_each_mem_range - iterate through memblock areas from type_a and not
 179  * included in type_b. Or just type_a if type_b is NULL.
 180  * @i: u64 used as loop variable
 181  * @type_a: ptr to memblock_type to iterate
 182  * @type_b: ptr to memblock_type which excludes from the iteration
 183  * @nid: node selector, %NUMA_NO_NODE for all nodes
 184  * @flags: pick from blocks based on memory attributes
 185  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 186  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 187  * @p_nid: ptr to int for nid of the range, can be %NULL
 188  */
 189 #define __for_each_mem_range(i, type_a, type_b, nid, flags,             \
 190                            p_start, p_end, p_nid)                       \
 191         for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b,    \
 192                                      p_start, p_end, p_nid);            \
 193              i != (u64)ULLONG_MAX;                                      \
 194              __next_mem_range(&i, nid, flags, type_a, type_b,           \
 195                               p_start, p_end, p_nid))
 196
 197 /**
 198  * __for_each_mem_range_rev - reverse iterate through memblock areas from
 199  * type_a and not included in type_b. Or just type_a if type_b is NULL.
 200  * @i: u64 used as loop variable
 201  * @type_a: ptr to memblock_type to iterate
 202  * @type_b: ptr to memblock_type which excludes from the iteration
 203  * @nid: node selector, %NUMA_NO_NODE for all nodes
 204  * @flags: pick from blocks based on memory attributes
 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  * @p_nid: ptr to int for nid of the range, can be %NULL
 208  */
 209 #define __for_each_mem_range_rev(i, type_a, type_b, nid, flags,         \
 210                                  p_start, p_end, p_nid)                 \
 211         for (i = (u64)ULLONG_MAX,                                       \
 212                      __next_mem_range_rev(&i, nid, flags, type_a, type_b, \
 213                                           p_start, p_end, p_nid);       \
 214              i != (u64)ULLONG_MAX;                                      \
 215              __next_mem_range_rev(&i, nid, flags, type_a, type_b,       \
 216                                   p_start, p_end, p_nid))
 217
 218 /**
 219  * for_each_mem_range - iterate through memory areas.
 220  * @i: u64 used as loop variable
 221  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 222  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 223  */
 224 #define for_each_mem_range(i, p_start, p_end) \
 225         __for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE,   \
 226                              MEMBLOCK_HOTPLUG | MEMBLOCK_DRIVER_MANAGED, \
 227                              p_start, p_end, NULL)
 228
 229 /**
 230  * for_each_mem_range_rev - reverse iterate through memblock areas from
 231  * type_a and not included in type_b. Or just type_a if type_b is NULL.
 232  * @i: u64 used as loop variable
 233  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 234  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 235  */
 236 #define for_each_mem_range_rev(i, p_start, p_end)                       \
 237         __for_each_mem_range_rev(i, &memblock.memory, NULL, NUMA_NO_NODE, \
 238                                  MEMBLOCK_HOTPLUG | MEMBLOCK_DRIVER_MANAGED,\
 239                                  p_start, p_end, NULL)
 240
 241 /**
 242  * for_each_reserved_mem_range - iterate over all reserved memblock areas
 243  * @i: u64 used as loop variable
 244  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 245  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 246  *
 247  * Walks over reserved areas of memblock. Available as soon as memblock
 248  * is initialized.
 249  */
 250 #define for_each_reserved_mem_range(i, p_start, p_end)                  \
 251         __for_each_mem_range(i, &memblock.reserved, NULL, NUMA_NO_NODE, \
 252                              MEMBLOCK_NONE, p_start, p_end, NULL)
 253
 254 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
 255 {
 256         return m->flags & MEMBLOCK_HOTPLUG;
 257 }
 258
 259 static inline bool memblock_is_mirror(struct memblock_region *m)
 260 {
 261         return m->flags & MEMBLOCK_MIRROR;
 262 }
 263
 264 static inline bool memblock_is_nomap(struct memblock_region *m)
 265 {
 266         return m->flags & MEMBLOCK_NOMAP;
 267 }
 268
 269 static inline bool memblock_is_reserved_noinit(struct memblock_region *m)
 270 {
 271         return m->flags & MEMBLOCK_RSRV_NOINIT;
 272 }
 273
 274 static inline bool memblock_is_driver_managed(struct memblock_region *m)
 275 {
 276         return m->flags & MEMBLOCK_DRIVER_MANAGED;
 277 }
 278
 279 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
 280                             unsigned long  *end_pfn);
 281 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
 282                           unsigned long *out_end_pfn, int *out_nid);
 283
 284 /**
 285  * for_each_mem_pfn_range - early memory pfn range iterator
 286  * @i: an integer used as loop variable
 287  * @nid: node selector, %MAX_NUMNODES for all nodes
 288  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
 289  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
 290  * @p_nid: ptr to int for nid of the range, can be %NULL
 291  *
 292  * Walks over configured memory ranges.
 293  */
 294 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)           \
 295         for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 296              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
 297
 298 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
 299 void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
 300                                   unsigned long *out_spfn,
 301                                   unsigned long *out_epfn);
 302
 303 /**
 304  * for_each_free_mem_pfn_range_in_zone_from - iterate through zone specific
 305  * free memblock areas from a given point
 306  * @i: u64 used as loop variable
 307  * @zone: zone in which all of the memory blocks reside
 308  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 309  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 310  *
 311  * Walks over free (memory && !reserved) areas of memblock in a specific
 312  * zone, continuing from current position. Available as soon as memblock is
 313  * initialized.
 314  */
 315 #define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \
 316         for (; i != U64_MAX;                                      \
 317              __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
 318
 319 #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
 320
 321 /**
 322  * for_each_free_mem_range - iterate through free memblock areas
 323  * @i: u64 used as loop variable
 324  * @nid: node selector, %NUMA_NO_NODE for all nodes
 325  * @flags: pick from blocks based on memory attributes
 326  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 327  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 328  * @p_nid: ptr to int for nid of the range, can be %NULL
 329  *
 330  * Walks over free (memory && !reserved) areas of memblock.  Available as
 331  * soon as memblock is initialized.
 332  */
 333 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid)   \
 334         __for_each_mem_range(i, &memblock.memory, &memblock.reserved,   \
 335                              nid, flags, p_start, p_end, p_nid)
 336
 337 /**
 338  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
 339  * @i: u64 used as loop variable
 340  * @nid: node selector, %NUMA_NO_NODE for all nodes
 341  * @flags: pick from blocks based on memory attributes
 342  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 343  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 344  * @p_nid: ptr to int for nid of the range, can be %NULL
 345  *
 346  * Walks over free (memory && !reserved) areas of memblock in reverse
 347  * order.  Available as soon as memblock is initialized.
 348  */
 349 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end,  \
 350                                         p_nid)                          \
 351         __for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
 352                                  nid, flags, p_start, p_end, p_nid)
 353
 354 int memblock_set_node(phys_addr_t base, phys_addr_t size,
 355                       struct memblock_type *type, int nid);
 356
 357 #ifdef CONFIG_NUMA
 358 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 359 {
 360         r->nid = nid;
 361 }
 362
 363 static inline int memblock_get_region_node(const struct memblock_region *r)
 364 {
 365         return r->nid;
 366 }
 367 #else
 368 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 369 {
 370 }
 371
 372 static inline int memblock_get_region_node(const struct memblock_region *r)
 373 {
 374         return 0;
 375 }
 376 #endif /* CONFIG_NUMA */
 377
 378 /* Flags for memblock allocation APIs */
 379 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 380 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 381 #define MEMBLOCK_ALLOC_NOLEAKTRACE      1
 382
 383 /* We are using top down, so it is safe to use 0 here */
 384 #define MEMBLOCK_LOW_LIMIT 0
 385
 386 #ifndef ARCH_LOW_ADDRESS_LIMIT
 387 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 388 #endif
 389
 390 phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align,
 391                                       phys_addr_t start, phys_addr_t end);
 392 phys_addr_t memblock_alloc_range_nid(phys_addr_t size,
 393                                       phys_addr_t align, phys_addr_t start,
 394                                       phys_addr_t end, int nid, bool exact_nid);
 395 phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 396
 397 static __always_inline phys_addr_t memblock_phys_alloc(phys_addr_t size,
 398                                                        phys_addr_t align)
 399 {
 400         return memblock_phys_alloc_range(size, align, 0,
 401                                          MEMBLOCK_ALLOC_ACCESSIBLE);
 402 }
 403
 404 void *memblock_alloc_exact_nid_raw(phys_addr_t size, phys_addr_t align,
 405                                  phys_addr_t min_addr, phys_addr_t max_addr,
 406                                  int nid);
 407 void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align,
 408                                  phys_addr_t min_addr, phys_addr_t max_addr,
 409                                  int nid);
 410 void *memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
 411                              phys_addr_t min_addr, phys_addr_t max_addr,
 412                              int nid);
 413
 414 static __always_inline void *memblock_alloc(phys_addr_t size, phys_addr_t align)
 415 {
 416         return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
 417                                       MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
 418 }
 419
 420 static inline void *memblock_alloc_raw(phys_addr_t size,
 421                                                phys_addr_t align)
 422 {
 423         return memblock_alloc_try_nid_raw(size, align, MEMBLOCK_LOW_LIMIT,
 424                                           MEMBLOCK_ALLOC_ACCESSIBLE,
 425                                           NUMA_NO_NODE);
 426 }
 427
 428 static inline void *memblock_alloc_from(phys_addr_t size,
 429                                                 phys_addr_t align,
 430                                                 phys_addr_t min_addr)
 431 {
 432         return memblock_alloc_try_nid(size, align, min_addr,
 433                                       MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
 434 }
 435
 436 static inline void *memblock_alloc_low(phys_addr_t size,
 437                                                phys_addr_t align)
 438 {
 439         return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
 440                                       ARCH_LOW_ADDRESS_LIMIT, NUMA_NO_NODE);
 441 }
 442
 443 static inline void *memblock_alloc_node(phys_addr_t size,
 444                                                 phys_addr_t align, int nid)
 445 {
 446         return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
 447                                       MEMBLOCK_ALLOC_ACCESSIBLE, nid);
 448 }
 449
 450 /*
 451  * Set the allocation direction to bottom-up or top-down.
 452  */
 453 static inline __init_memblock void memblock_set_bottom_up(bool enable)
 454 {
 455         memblock.bottom_up = enable;
 456 }
 457
 458 /*
 459  * Check if the allocation direction is bottom-up or not.
 460  * if this is true, that said, memblock will allocate memory
 461  * in bottom-up direction.
 462  */
 463 static inline __init_memblock bool memblock_bottom_up(void)
 464 {
 465         return memblock.bottom_up;
 466 }
 467
 468 phys_addr_t memblock_phys_mem_size(void);
 469 phys_addr_t memblock_reserved_size(void);
 470 unsigned long memblock_estimated_nr_free_pages(void);
 471 phys_addr_t memblock_start_of_DRAM(void);
 472 phys_addr_t memblock_end_of_DRAM(void);
 473 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 474 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
 475 void memblock_mem_limit_remove_map(phys_addr_t limit);
 476 bool memblock_is_memory(phys_addr_t addr);
 477 bool memblock_is_map_memory(phys_addr_t addr);
 478 bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 479 bool memblock_is_reserved(phys_addr_t addr);
 480 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 481
 482 void memblock_dump_all(void);
 483
 484 /**
 485  * memblock_set_current_limit - Set the current allocation limit to allow
 486  *                         limiting allocations to what is currently
 487  *                         accessible during boot
 488  * @limit: New limit value (physical address)
 489  */
 490 void memblock_set_current_limit(phys_addr_t limit);
 491
 492
 493 phys_addr_t memblock_get_current_limit(void);
 494
 495 /*
 496  * pfn conversion functions
 497  *
 498  * While the memory MEMBLOCKs should always be page aligned, the reserved
 499  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 500  * idea of what they return for such non aligned MEMBLOCKs.
 501  */
 502
 503 /**
 504  * memblock_region_memory_base_pfn - get the lowest pfn of the memory region
 505  * @reg: memblock_region structure
 506  *
 507  * Return: the lowest pfn intersecting with the memory region
 508  */
 509 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 510 {
 511         return PFN_UP(reg->base);
 512 }
 513
 514 /**
 515  * memblock_region_memory_end_pfn - get the end pfn of the memory region
 516  * @reg: memblock_region structure
 517  *
 518  * Return: the end_pfn of the reserved region
 519  */
 520 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 521 {
 522         return PFN_DOWN(reg->base + reg->size);
 523 }
 524
 525 /**
 526  * memblock_region_reserved_base_pfn - get the lowest pfn of the reserved region
 527  * @reg: memblock_region structure
 528  *
 529  * Return: the lowest pfn intersecting with the reserved region
 530  */
 531 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 532 {
 533         return PFN_DOWN(reg->base);
 534 }
 535
 536 /**
 537  * memblock_region_reserved_end_pfn - get the end pfn of the reserved region
 538  * @reg: memblock_region structure
 539  *
 540  * Return: the end_pfn of the reserved region
 541  */
 542 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 543 {
 544         return PFN_UP(reg->base + reg->size);
 545 }
 546
 547 /**
 548  * for_each_mem_region - iterate over memory regions
 549  * @region: loop variable
 550  */
 551 #define for_each_mem_region(region)                                     \
 552         for (region = memblock.memory.regions;                          \
 553              region < (memblock.memory.regions + memblock.memory.cnt);  \
 554              region++)
 555
 556 /**
 557  * for_each_reserved_mem_region - itereate over reserved memory regions
 558  * @region: loop variable
 559  */
 560 #define for_each_reserved_mem_region(region)                            \
 561         for (region = memblock.reserved.regions;                        \
 562              region < (memblock.reserved.regions + memblock.reserved.cnt); \
 563              region++)
 564
 565 extern void *alloc_large_system_hash(const char *tablename,
 566                                      unsigned long bucketsize,
 567                                      unsigned long numentries,
 568                                      int scale,
 569                                      int flags,
 570                                      unsigned int *_hash_shift,
 571                                      unsigned int *_hash_mask,
 572                                      unsigned long low_limit,
 573                                      unsigned long high_limit);
 574
 575 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 576 #define HASH_ZERO       0x00000002      /* Zero allocated hash table */
 577
 578 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
 579  * sufficient vmalloc space.
 580  */
 581 #ifdef CONFIG_NUMA
 582 #define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT)
 583 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 584 #else
 585 #define hashdist (0)
 586 #endif
 587
 588 #ifdef CONFIG_MEMTEST
 589 void early_memtest(phys_addr_t start, phys_addr_t end);
 590 void memtest_report_meminfo(struct seq_file *m);
 591 #else
 592 static inline void early_memtest(phys_addr_t start, phys_addr_t end) { }
 593 static inline void memtest_report_meminfo(struct seq_file *m) { }
 594 #endif
 595
 596
 597 #endif /* _LINUX_MEMBLOCK_H */