include/linux/memblock.h

   1 #ifndef _LINUX_MEMBLOCK_H
   2 #define _LINUX_MEMBLOCK_H
   3 #ifdef __KERNEL__
   4
   5 #ifdef CONFIG_HAVE_MEMBLOCK
   6 /*
   7  * Logical memory blocks.
   8  *
   9  * Copyright (C) 2001 Peter Bergner, IBM Corp.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version
  14  * 2 of the License, or (at your option) any later version.
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/mm.h>
  19
  20 #define INIT_MEMBLOCK_REGIONS   128
  21 #define INIT_PHYSMEM_REGIONS    4
  22
  23 /* Definition of memblock flags. */
  24 enum {
  25         MEMBLOCK_NONE           = 0x0,  /* No special request */
  26         MEMBLOCK_HOTPLUG        = 0x1,  /* hotpluggable region */
  27         MEMBLOCK_MIRROR         = 0x2,  /* mirrored region */
  28         MEMBLOCK_NOMAP          = 0x4,  /* don't add to kernel direct mapping */
  29 };
  30
  31 struct memblock_region {
  32         phys_addr_t base;
  33         phys_addr_t size;
  34         unsigned long flags;
  35 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
  36         int nid;
  37 #endif
  38 };
  39
  40 struct memblock_type {
  41         unsigned long cnt;      /* number of regions */
  42         unsigned long max;      /* size of the allocated array */
  43         phys_addr_t total_size; /* size of all regions */
  44         struct memblock_region *regions;
  45 };
  46
  47 struct memblock {
  48         bool bottom_up;  /* is bottom up direction? */
  49         phys_addr_t current_limit;
  50         struct memblock_type memory;
  51         struct memblock_type reserved;
  52 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
  53         struct memblock_type physmem;
  54 #endif
  55 };
  56
  57 extern struct memblock memblock;
  58 extern int memblock_debug;
  59 #ifdef CONFIG_MOVABLE_NODE
  60 /* If movable_node boot option specified */
  61 extern bool movable_node_enabled;
  62 #endif /* CONFIG_MOVABLE_NODE */
  63
  64 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
  65 #define __init_memblock __meminit
  66 #define __initdata_memblock __meminitdata
  67 #else
  68 #define __init_memblock
  69 #define __initdata_memblock
  70 #endif
  71
  72 #define memblock_dbg(fmt, ...) \
  73         if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  74
  75 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align,
  76                                             phys_addr_t start, phys_addr_t end,
  77                                             int nid, ulong flags);
  78 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
  79                                    phys_addr_t size, phys_addr_t align);
  80 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
  81 phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr);
  82 void memblock_allow_resize(void);
  83 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
  84 int memblock_add(phys_addr_t base, phys_addr_t size);
  85 int memblock_remove(phys_addr_t base, phys_addr_t size);
  86 int memblock_free(phys_addr_t base, phys_addr_t size);
  87 int memblock_reserve(phys_addr_t base, phys_addr_t size);
  88 void memblock_trim_memory(phys_addr_t align);
  89 bool memblock_overlaps_region(struct memblock_type *type,
  90                               phys_addr_t base, phys_addr_t size);
  91 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
  92 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
  93 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
  94 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
  95 ulong choose_memblock_flags(void);
  96
  97 /* Low level functions */
  98 int memblock_add_range(struct memblock_type *type,
  99                        phys_addr_t base, phys_addr_t size,
 100                        int nid, unsigned long flags);
 101
 102 void __next_mem_range(u64 *idx, int nid, ulong flags,
 103                       struct memblock_type *type_a,
 104                       struct memblock_type *type_b, phys_addr_t *out_start,
 105                       phys_addr_t *out_end, int *out_nid);
 106
 107 void __next_mem_range_rev(u64 *idx, int nid, ulong flags,
 108                           struct memblock_type *type_a,
 109                           struct memblock_type *type_b, phys_addr_t *out_start,
 110                           phys_addr_t *out_end, int *out_nid);
 111
 112 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start,
 113                                phys_addr_t *out_end);
 114
 115 /**
 116  * for_each_mem_range - iterate through memblock areas from type_a and not
 117  * included in type_b. Or just type_a if type_b is NULL.
 118  * @i: u64 used as loop variable
 119  * @type_a: ptr to memblock_type to iterate
 120  * @type_b: ptr to memblock_type which excludes from the iteration
 121  * @nid: node selector, %NUMA_NO_NODE for all nodes
 122  * @flags: pick from blocks based on memory attributes
 123  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 124  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 125  * @p_nid: ptr to int for nid of the range, can be %NULL
 126  */
 127 #define for_each_mem_range(i, type_a, type_b, nid, flags,               \
 128                            p_start, p_end, p_nid)                       \
 129         for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b,    \
 130                                      p_start, p_end, p_nid);            \
 131              i != (u64)ULLONG_MAX;                                      \
 132              __next_mem_range(&i, nid, flags, type_a, type_b,           \
 133                               p_start, p_end, p_nid))
 134
 135 /**
 136  * for_each_mem_range_rev - reverse iterate through memblock areas from
 137  * type_a and not included in type_b. Or just type_a if type_b is NULL.
 138  * @i: u64 used as loop variable
 139  * @type_a: ptr to memblock_type to iterate
 140  * @type_b: ptr to memblock_type which excludes from the iteration
 141  * @nid: node selector, %NUMA_NO_NODE for all nodes
 142  * @flags: pick from blocks based on memory attributes
 143  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 144  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 145  * @p_nid: ptr to int for nid of the range, can be %NULL
 146  */
 147 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags,           \
 148                                p_start, p_end, p_nid)                   \
 149         for (i = (u64)ULLONG_MAX,                                       \
 150                      __next_mem_range_rev(&i, nid, flags, type_a, type_b,\
 151                                          p_start, p_end, p_nid);        \
 152              i != (u64)ULLONG_MAX;                                      \
 153              __next_mem_range_rev(&i, nid, flags, type_a, type_b,       \
 154                                   p_start, p_end, p_nid))
 155
 156 /**
 157  * for_each_reserved_mem_region - iterate over all reserved memblock areas
 158  * @i: u64 used as loop variable
 159  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 160  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 161  *
 162  * Walks over reserved areas of memblock. Available as soon as memblock
 163  * is initialized.
 164  */
 165 #define for_each_reserved_mem_region(i, p_start, p_end)                 \
 166         for (i = 0UL,                                                   \
 167              __next_reserved_mem_region(&i, p_start, p_end);            \
 168              i != (u64)ULLONG_MAX;                                      \
 169              __next_reserved_mem_region(&i, p_start, p_end))
 170
 171 #ifdef CONFIG_MOVABLE_NODE
 172 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
 173 {
 174         return m->flags & MEMBLOCK_HOTPLUG;
 175 }
 176
 177 static inline bool __init_memblock movable_node_is_enabled(void)
 178 {
 179         return movable_node_enabled;
 180 }
 181 #else
 182 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
 183 {
 184         return false;
 185 }
 186 static inline bool movable_node_is_enabled(void)
 187 {
 188         return false;
 189 }
 190 #endif
 191
 192 static inline bool memblock_is_mirror(struct memblock_region *m)
 193 {
 194         return m->flags & MEMBLOCK_MIRROR;
 195 }
 196
 197 static inline bool memblock_is_nomap(struct memblock_region *m)
 198 {
 199         return m->flags & MEMBLOCK_NOMAP;
 200 }
 201
 202 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 203 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
 204                             unsigned long  *end_pfn);
 205 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
 206                           unsigned long *out_end_pfn, int *out_nid);
 207
 208 /**
 209  * for_each_mem_pfn_range - early memory pfn range iterator
 210  * @i: an integer used as loop variable
 211  * @nid: node selector, %MAX_NUMNODES for all nodes
 212  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
 213  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
 214  * @p_nid: ptr to int for nid of the range, can be %NULL
 215  *
 216  * Walks over configured memory ranges.
 217  */
 218 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)           \
 219         for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 220              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
 221 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 222
 223 /**
 224  * for_each_free_mem_range - iterate through free memblock areas
 225  * @i: u64 used as loop variable
 226  * @nid: node selector, %NUMA_NO_NODE for all nodes
 227  * @flags: pick from blocks based on memory attributes
 228  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 229  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 230  * @p_nid: ptr to int for nid of the range, can be %NULL
 231  *
 232  * Walks over free (memory && !reserved) areas of memblock.  Available as
 233  * soon as memblock is initialized.
 234  */
 235 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid)   \
 236         for_each_mem_range(i, &memblock.memory, &memblock.reserved,     \
 237                            nid, flags, p_start, p_end, p_nid)
 238
 239 /**
 240  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
 241  * @i: u64 used as loop variable
 242  * @nid: node selector, %NUMA_NO_NODE for all nodes
 243  * @flags: pick from blocks based on memory attributes
 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  * @p_nid: ptr to int for nid of the range, can be %NULL
 247  *
 248  * Walks over free (memory && !reserved) areas of memblock in reverse
 249  * order.  Available as soon as memblock is initialized.
 250  */
 251 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end,  \
 252                                         p_nid)                          \
 253         for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
 254                                nid, flags, p_start, p_end, p_nid)
 255
 256 static inline void memblock_set_region_flags(struct memblock_region *r,
 257                                              unsigned long flags)
 258 {
 259         r->flags |= flags;
 260 }
 261
 262 static inline void memblock_clear_region_flags(struct memblock_region *r,
 263                                                unsigned long flags)
 264 {
 265         r->flags &= ~flags;
 266 }
 267
 268 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 269 int memblock_set_node(phys_addr_t base, phys_addr_t size,
 270                       struct memblock_type *type, int nid);
 271
 272 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 273 {
 274         r->nid = nid;
 275 }
 276
 277 static inline int memblock_get_region_node(const struct memblock_region *r)
 278 {
 279         return r->nid;
 280 }
 281 #else
 282 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 283 {
 284 }
 285
 286 static inline int memblock_get_region_node(const struct memblock_region *r)
 287 {
 288         return 0;
 289 }
 290 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 291
 292 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 293 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 294
 295 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
 296
 297 #ifdef CONFIG_MOVABLE_NODE
 298 /*
 299  * Set the allocation direction to bottom-up or top-down.
 300  */
 301 static inline void __init memblock_set_bottom_up(bool enable)
 302 {
 303         memblock.bottom_up = enable;
 304 }
 305
 306 /*
 307  * Check if the allocation direction is bottom-up or not.
 308  * if this is true, that said, memblock will allocate memory
 309  * in bottom-up direction.
 310  */
 311 static inline bool memblock_bottom_up(void)
 312 {
 313         return memblock.bottom_up;
 314 }
 315 #else
 316 static inline void __init memblock_set_bottom_up(bool enable) {}
 317 static inline bool memblock_bottom_up(void) { return false; }
 318 #endif
 319
 320 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
 321 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 322 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 323
 324 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
 325                                         phys_addr_t start, phys_addr_t end,
 326                                         ulong flags);
 327 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 328                                 phys_addr_t max_addr);
 329 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 330                                   phys_addr_t max_addr);
 331 phys_addr_t memblock_phys_mem_size(void);
 332 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
 333 phys_addr_t memblock_start_of_DRAM(void);
 334 phys_addr_t memblock_end_of_DRAM(void);
 335 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 336 bool memblock_is_memory(phys_addr_t addr);
 337 int memblock_is_map_memory(phys_addr_t addr);
 338 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 339 bool memblock_is_reserved(phys_addr_t addr);
 340 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 341
 342 extern void __memblock_dump_all(void);
 343
 344 static inline void memblock_dump_all(void)
 345 {
 346         if (memblock_debug)
 347                 __memblock_dump_all();
 348 }
 349
 350 /**
 351  * memblock_set_current_limit - Set the current allocation limit to allow
 352  *                         limiting allocations to what is currently
 353  *                         accessible during boot
 354  * @limit: New limit value (physical address)
 355  */
 356 void memblock_set_current_limit(phys_addr_t limit);
 357
 358
 359 phys_addr_t memblock_get_current_limit(void);
 360
 361 /*
 362  * pfn conversion functions
 363  *
 364  * While the memory MEMBLOCKs should always be page aligned, the reserved
 365  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 366  * idea of what they return for such non aligned MEMBLOCKs.
 367  */
 368
 369 /**
 370  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 371  * @reg: memblock_region structure
 372  */
 373 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 374 {
 375         return PFN_UP(reg->base);
 376 }
 377
 378 /**
 379  * memblock_region_memory_end_pfn - Return the end_pfn this region
 380  * @reg: memblock_region structure
 381  */
 382 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 383 {
 384         return PFN_DOWN(reg->base + reg->size);
 385 }
 386
 387 /**
 388  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 389  * @reg: memblock_region structure
 390  */
 391 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 392 {
 393         return PFN_DOWN(reg->base);
 394 }
 395
 396 /**
 397  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 398  * @reg: memblock_region structure
 399  */
 400 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 401 {
 402         return PFN_UP(reg->base + reg->size);
 403 }
 404
 405 #define for_each_memblock(memblock_type, region)                                        \
 406         for (region = memblock.memblock_type.regions;                           \
 407              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 408              region++)
 409
 410 #define for_each_memblock_type(memblock_type, rgn)                      \
 411         idx = 0;                                                        \
 412         rgn = &memblock_type->regions[idx];                             \
 413         for (idx = 0; idx < memblock_type->cnt;                         \
 414              idx++,rgn = &memblock_type->regions[idx])
 415
 416 #ifdef CONFIG_MEMTEST
 417 extern void early_memtest(phys_addr_t start, phys_addr_t end);
 418 #else
 419 static inline void early_memtest(phys_addr_t start, phys_addr_t end)
 420 {
 421 }
 422 #endif
 423
 424 #else
 425 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 426 {
 427         return 0;
 428 }
 429
 430 #endif /* CONFIG_HAVE_MEMBLOCK */
 431
 432 #endif /* __KERNEL__ */
 433
 434 #endif /* _LINUX_MEMBLOCK_H */