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 };
  29
  30 struct memblock_region {
  31         phys_addr_t base;
  32         phys_addr_t size;
  33         unsigned long flags;
  34 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
  35         int nid;
  36 #endif
  37 };
  38
  39 struct memblock_type {
  40         unsigned long cnt;      /* number of regions */
  41         unsigned long max;      /* size of the allocated array */
  42         phys_addr_t total_size; /* size of all regions */
  43         struct memblock_region *regions;
  44 };
  45
  46 struct memblock {
  47         bool bottom_up;  /* is bottom up direction? */
  48         phys_addr_t current_limit;
  49         struct memblock_type memory;
  50         struct memblock_type reserved;
  51 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
  52         struct memblock_type physmem;
  53 #endif
  54 };
  55
  56 extern struct memblock memblock;
  57 extern int memblock_debug;
  58 #ifdef CONFIG_MOVABLE_NODE
  59 /* If movable_node boot option specified */
  60 extern bool movable_node_enabled;
  61 #endif /* CONFIG_MOVABLE_NODE */
  62
  63 #define memblock_dbg(fmt, ...) \
  64         if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  65
  66 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align,
  67                                             phys_addr_t start, phys_addr_t end,
  68                                             int nid, ulong flags);
  69 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
  70                                    phys_addr_t size, phys_addr_t align);
  71 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
  72 phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr);
  73 void memblock_allow_resize(void);
  74 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
  75 int memblock_add(phys_addr_t base, phys_addr_t size);
  76 int memblock_remove(phys_addr_t base, phys_addr_t size);
  77 int memblock_free(phys_addr_t base, phys_addr_t size);
  78 int memblock_reserve(phys_addr_t base, phys_addr_t size);
  79 void memblock_trim_memory(phys_addr_t align);
  80 bool memblock_overlaps_region(struct memblock_type *type,
  81                               phys_addr_t base, phys_addr_t size);
  82 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
  83 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
  84 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
  85 ulong choose_memblock_flags(void);
  86
  87 /* Low level functions */
  88 int memblock_add_range(struct memblock_type *type,
  89                        phys_addr_t base, phys_addr_t size,
  90                        int nid, unsigned long flags);
  91
  92 void __next_mem_range(u64 *idx, int nid, ulong flags,
  93                       struct memblock_type *type_a,
  94                       struct memblock_type *type_b, phys_addr_t *out_start,
  95                       phys_addr_t *out_end, int *out_nid);
  96
  97 void __next_mem_range_rev(u64 *idx, int nid, ulong flags,
  98                           struct memblock_type *type_a,
  99                           struct memblock_type *type_b, phys_addr_t *out_start,
 100                           phys_addr_t *out_end, int *out_nid);
 101
 102 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start,
 103                                phys_addr_t *out_end);
 104
 105 /**
 106  * for_each_mem_range - iterate through memblock areas from type_a and not
 107  * included in type_b. Or just type_a if type_b is NULL.
 108  * @i: u64 used as loop variable
 109  * @type_a: ptr to memblock_type to iterate
 110  * @type_b: ptr to memblock_type which excludes from the iteration
 111  * @nid: node selector, %NUMA_NO_NODE for all nodes
 112  * @flags: pick from blocks based on memory attributes
 113  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 114  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 115  * @p_nid: ptr to int for nid of the range, can be %NULL
 116  */
 117 #define for_each_mem_range(i, type_a, type_b, nid, flags,               \
 118                            p_start, p_end, p_nid)                       \
 119         for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b,    \
 120                                      p_start, p_end, p_nid);            \
 121              i != (u64)ULLONG_MAX;                                      \
 122              __next_mem_range(&i, nid, flags, type_a, type_b,           \
 123                               p_start, p_end, p_nid))
 124
 125 /**
 126  * for_each_mem_range_rev - reverse iterate through memblock areas from
 127  * type_a and not included in type_b. Or just type_a if type_b is NULL.
 128  * @i: u64 used as loop variable
 129  * @type_a: ptr to memblock_type to iterate
 130  * @type_b: ptr to memblock_type which excludes from the iteration
 131  * @nid: node selector, %NUMA_NO_NODE for all nodes
 132  * @flags: pick from blocks based on memory attributes
 133  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 134  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 135  * @p_nid: ptr to int for nid of the range, can be %NULL
 136  */
 137 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags,           \
 138                                p_start, p_end, p_nid)                   \
 139         for (i = (u64)ULLONG_MAX,                                       \
 140                      __next_mem_range_rev(&i, nid, flags, type_a, type_b,\
 141                                          p_start, p_end, p_nid);        \
 142              i != (u64)ULLONG_MAX;                                      \
 143              __next_mem_range_rev(&i, nid, flags, type_a, type_b,       \
 144                                   p_start, p_end, p_nid))
 145
 146 /**
 147  * for_each_reserved_mem_region - iterate over all reserved memblock areas
 148  * @i: u64 used as loop variable
 149  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 150  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 151  *
 152  * Walks over reserved areas of memblock. Available as soon as memblock
 153  * is initialized.
 154  */
 155 #define for_each_reserved_mem_region(i, p_start, p_end)                 \
 156         for (i = 0UL,                                                   \
 157              __next_reserved_mem_region(&i, p_start, p_end);            \
 158              i != (u64)ULLONG_MAX;                                      \
 159              __next_reserved_mem_region(&i, p_start, p_end))
 160
 161 #ifdef CONFIG_MOVABLE_NODE
 162 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
 163 {
 164         return m->flags & MEMBLOCK_HOTPLUG;
 165 }
 166
 167 static inline bool movable_node_is_enabled(void)
 168 {
 169         return movable_node_enabled;
 170 }
 171 #else
 172 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
 173 {
 174         return false;
 175 }
 176 static inline bool movable_node_is_enabled(void)
 177 {
 178         return false;
 179 }
 180 #endif
 181
 182 static inline bool memblock_is_mirror(struct memblock_region *m)
 183 {
 184         return m->flags & MEMBLOCK_MIRROR;
 185 }
 186
 187 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 188 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
 189                             unsigned long  *end_pfn);
 190 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
 191                           unsigned long *out_end_pfn, int *out_nid);
 192
 193 /**
 194  * for_each_mem_pfn_range - early memory pfn range iterator
 195  * @i: an integer used as loop variable
 196  * @nid: node selector, %MAX_NUMNODES for all nodes
 197  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
 198  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
 199  * @p_nid: ptr to int for nid of the range, can be %NULL
 200  *
 201  * Walks over configured memory ranges.
 202  */
 203 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)           \
 204         for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 205              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
 206 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 207
 208 /**
 209  * for_each_free_mem_range - iterate through free memblock areas
 210  * @i: u64 used as loop variable
 211  * @nid: node selector, %NUMA_NO_NODE for all nodes
 212  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 213  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 214  * @p_nid: ptr to int for nid of the range, can be %NULL
 215  * @flags: pick from blocks based on memory attributes
 216  *
 217  * Walks over free (memory && !reserved) areas of memblock.  Available as
 218  * soon as memblock is initialized.
 219  */
 220 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid)   \
 221         for_each_mem_range(i, &memblock.memory, &memblock.reserved,     \
 222                            nid, flags, p_start, p_end, p_nid)
 223
 224 /**
 225  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
 226  * @i: u64 used as loop variable
 227  * @nid: node selector, %NUMA_NO_NODE for all nodes
 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  * @flags: pick from blocks based on memory attributes
 232  *
 233  * Walks over free (memory && !reserved) areas of memblock in reverse
 234  * order.  Available as soon as memblock is initialized.
 235  */
 236 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end,  \
 237                                         p_nid)                          \
 238         for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
 239                                nid, flags, p_start, p_end, p_nid)
 240
 241 static inline void memblock_set_region_flags(struct memblock_region *r,
 242                                              unsigned long flags)
 243 {
 244         r->flags |= flags;
 245 }
 246
 247 static inline void memblock_clear_region_flags(struct memblock_region *r,
 248                                                unsigned long flags)
 249 {
 250         r->flags &= ~flags;
 251 }
 252
 253 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 254 int memblock_set_node(phys_addr_t base, phys_addr_t size,
 255                       struct memblock_type *type, int nid);
 256
 257 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 258 {
 259         r->nid = nid;
 260 }
 261
 262 static inline int memblock_get_region_node(const struct memblock_region *r)
 263 {
 264         return r->nid;
 265 }
 266 #else
 267 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 268 {
 269 }
 270
 271 static inline int memblock_get_region_node(const struct memblock_region *r)
 272 {
 273         return 0;
 274 }
 275 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 276
 277 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 278 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 279
 280 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
 281
 282 #ifdef CONFIG_MOVABLE_NODE
 283 /*
 284  * Set the allocation direction to bottom-up or top-down.
 285  */
 286 static inline void __init memblock_set_bottom_up(bool enable)
 287 {
 288         memblock.bottom_up = enable;
 289 }
 290
 291 /*
 292  * Check if the allocation direction is bottom-up or not.
 293  * if this is true, that said, memblock will allocate memory
 294  * in bottom-up direction.
 295  */
 296 static inline bool memblock_bottom_up(void)
 297 {
 298         return memblock.bottom_up;
 299 }
 300 #else
 301 static inline void __init memblock_set_bottom_up(bool enable) {}
 302 static inline bool memblock_bottom_up(void) { return false; }
 303 #endif
 304
 305 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
 306 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 307 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 308
 309 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
 310                                         phys_addr_t start, phys_addr_t end,
 311                                         ulong flags);
 312 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 313                                 phys_addr_t max_addr);
 314 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 315                                   phys_addr_t max_addr);
 316 phys_addr_t memblock_phys_mem_size(void);
 317 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
 318 phys_addr_t memblock_start_of_DRAM(void);
 319 phys_addr_t memblock_end_of_DRAM(void);
 320 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 321 int memblock_is_memory(phys_addr_t addr);
 322 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 323 int memblock_is_reserved(phys_addr_t addr);
 324 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 325
 326 extern void __memblock_dump_all(void);
 327
 328 static inline void memblock_dump_all(void)
 329 {
 330         if (memblock_debug)
 331                 __memblock_dump_all();
 332 }
 333
 334 /**
 335  * memblock_set_current_limit - Set the current allocation limit to allow
 336  *                         limiting allocations to what is currently
 337  *                         accessible during boot
 338  * @limit: New limit value (physical address)
 339  */
 340 void memblock_set_current_limit(phys_addr_t limit);
 341
 342
 343 phys_addr_t memblock_get_current_limit(void);
 344
 345 /*
 346  * pfn conversion functions
 347  *
 348  * While the memory MEMBLOCKs should always be page aligned, the reserved
 349  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 350  * idea of what they return for such non aligned MEMBLOCKs.
 351  */
 352
 353 /**
 354  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 355  * @reg: memblock_region structure
 356  */
 357 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 358 {
 359         return PFN_UP(reg->base);
 360 }
 361
 362 /**
 363  * memblock_region_memory_end_pfn - Return the end_pfn this region
 364  * @reg: memblock_region structure
 365  */
 366 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 367 {
 368         return PFN_DOWN(reg->base + reg->size);
 369 }
 370
 371 /**
 372  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 373  * @reg: memblock_region structure
 374  */
 375 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 376 {
 377         return PFN_DOWN(reg->base);
 378 }
 379
 380 /**
 381  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 382  * @reg: memblock_region structure
 383  */
 384 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 385 {
 386         return PFN_UP(reg->base + reg->size);
 387 }
 388
 389 #define for_each_memblock(memblock_type, region)                                        \
 390         for (region = memblock.memblock_type.regions;                           \
 391              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 392              region++)
 393
 394
 395 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
 396 #define __init_memblock __meminit
 397 #define __initdata_memblock __meminitdata
 398 #else
 399 #define __init_memblock
 400 #define __initdata_memblock
 401 #endif
 402
 403 #ifdef CONFIG_MEMTEST
 404 extern void early_memtest(phys_addr_t start, phys_addr_t end);
 405 #else
 406 static inline void early_memtest(phys_addr_t start, phys_addr_t end)
 407 {
 408 }
 409 #endif
 410
 411 #else
 412 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 413 {
 414         return 0;
 415 }
 416
 417 #endif /* CONFIG_HAVE_MEMBLOCK */
 418
 419 #endif /* __KERNEL__ */
 420
 421 #endif /* _LINUX_MEMBLOCK_H */