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         char *name;
  46 };
  47
  48 struct memblock {
  49         bool bottom_up;  /* is bottom up direction? */
  50         phys_addr_t current_limit;
  51         struct memblock_type memory;
  52         struct memblock_type reserved;
  53 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
  54         struct memblock_type physmem;
  55 #endif
  56 };
  57
  58 extern struct memblock memblock;
  59 extern int memblock_debug;
  60 /* If movable_node boot option specified */
  61 extern bool movable_node_enabled;
  62
  63 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
  64 #define __init_memblock __meminit
  65 #define __initdata_memblock __meminitdata
  66 #else
  67 #define __init_memblock
  68 #define __initdata_memblock
  69 #endif
  70
  71 #define memblock_dbg(fmt, ...) \
  72         if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  73
  74 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align,
  75                                         phys_addr_t start, phys_addr_t end,
  76                                         int nid, ulong flags);
  77 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
  78                                    phys_addr_t size, phys_addr_t align);
  79 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
  80 phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr);
  81 void memblock_allow_resize(void);
  82 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
  83 int memblock_add(phys_addr_t base, phys_addr_t size);
  84 int memblock_remove(phys_addr_t base, phys_addr_t size);
  85 int memblock_free(phys_addr_t base, phys_addr_t size);
  86 int memblock_reserve(phys_addr_t base, phys_addr_t size);
  87 void memblock_trim_memory(phys_addr_t align);
  88 bool memblock_overlaps_region(struct memblock_type *type,
  89                               phys_addr_t base, phys_addr_t size);
  90 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
  91 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
  92 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
  93 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
  94 int memblock_clear_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, __next_reserved_mem_region(&i, p_start, p_end);   \
 167              i != (u64)ULLONG_MAX;                                      \
 168              __next_reserved_mem_region(&i, p_start, p_end))
 169
 170 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
 171 {
 172         return m->flags & MEMBLOCK_HOTPLUG;
 173 }
 174
 175 static inline bool __init_memblock movable_node_is_enabled(void)
 176 {
 177         return movable_node_enabled;
 178 }
 179
 180 static inline bool memblock_is_mirror(struct memblock_region *m)
 181 {
 182         return m->flags & MEMBLOCK_MIRROR;
 183 }
 184
 185 static inline bool memblock_is_nomap(struct memblock_region *m)
 186 {
 187         return m->flags & MEMBLOCK_NOMAP;
 188 }
 189
 190 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 191 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
 192                             unsigned long  *end_pfn);
 193 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
 194                           unsigned long *out_end_pfn, int *out_nid);
 195 unsigned long memblock_next_valid_pfn(unsigned long pfn, unsigned long max_pfn);
 196
 197 /**
 198  * for_each_mem_pfn_range - early memory pfn range iterator
 199  * @i: an integer used as loop variable
 200  * @nid: node selector, %MAX_NUMNODES for all nodes
 201  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
 202  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
 203  * @p_nid: ptr to int for nid of the range, can be %NULL
 204  *
 205  * Walks over configured memory ranges.
 206  */
 207 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)           \
 208         for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 209              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
 210 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 211
 212 /**
 213  * for_each_free_mem_range - iterate through free memblock areas
 214  * @i: u64 used as loop variable
 215  * @nid: node selector, %NUMA_NO_NODE for all nodes
 216  * @flags: pick from blocks based on memory attributes
 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  * @p_nid: ptr to int for nid of the range, can be %NULL
 220  *
 221  * Walks over free (memory && !reserved) areas of memblock.  Available as
 222  * soon as memblock is initialized.
 223  */
 224 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid)   \
 225         for_each_mem_range(i, &memblock.memory, &memblock.reserved,     \
 226                            nid, flags, p_start, p_end, p_nid)
 227
 228 /**
 229  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
 230  * @i: u64 used as loop variable
 231  * @nid: node selector, %NUMA_NO_NODE for all nodes
 232  * @flags: pick from blocks based on memory attributes
 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  * @p_nid: ptr to int for nid of the range, can be %NULL
 236  *
 237  * Walks over free (memory && !reserved) areas of memblock in reverse
 238  * order.  Available as soon as memblock is initialized.
 239  */
 240 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end,  \
 241                                         p_nid)                          \
 242         for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
 243                                nid, flags, p_start, p_end, p_nid)
 244
 245 static inline void memblock_set_region_flags(struct memblock_region *r,
 246                                              unsigned long flags)
 247 {
 248         r->flags |= flags;
 249 }
 250
 251 static inline void memblock_clear_region_flags(struct memblock_region *r,
 252                                                unsigned long flags)
 253 {
 254         r->flags &= ~flags;
 255 }
 256
 257 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 258 int memblock_set_node(phys_addr_t base, phys_addr_t size,
 259                       struct memblock_type *type, int nid);
 260
 261 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 262 {
 263         r->nid = nid;
 264 }
 265
 266 static inline int memblock_get_region_node(const struct memblock_region *r)
 267 {
 268         return r->nid;
 269 }
 270 #else
 271 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 272 {
 273 }
 274
 275 static inline int memblock_get_region_node(const struct memblock_region *r)
 276 {
 277         return 0;
 278 }
 279 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 280
 281 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 282 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 283
 284 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
 285
 286 /*
 287  * Set the allocation direction to bottom-up or top-down.
 288  */
 289 static inline void __init memblock_set_bottom_up(bool enable)
 290 {
 291         memblock.bottom_up = enable;
 292 }
 293
 294 /*
 295  * Check if the allocation direction is bottom-up or not.
 296  * if this is true, that said, memblock will allocate memory
 297  * in bottom-up direction.
 298  */
 299 static inline bool memblock_bottom_up(void)
 300 {
 301         return memblock.bottom_up;
 302 }
 303
 304 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
 305 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 306 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 307
 308 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
 309                                         phys_addr_t start, phys_addr_t end,
 310                                         ulong flags);
 311 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 312                                 phys_addr_t max_addr);
 313 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 314                                   phys_addr_t max_addr);
 315 phys_addr_t memblock_phys_mem_size(void);
 316 phys_addr_t memblock_reserved_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 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
 322 void memblock_mem_limit_remove_map(phys_addr_t limit);
 323 bool memblock_is_memory(phys_addr_t addr);
 324 int memblock_is_map_memory(phys_addr_t addr);
 325 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 326 bool memblock_is_reserved(phys_addr_t addr);
 327 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 328
 329 extern void __memblock_dump_all(void);
 330
 331 static inline void memblock_dump_all(void)
 332 {
 333         if (memblock_debug)
 334                 __memblock_dump_all();
 335 }
 336
 337 /**
 338  * memblock_set_current_limit - Set the current allocation limit to allow
 339  *                         limiting allocations to what is currently
 340  *                         accessible during boot
 341  * @limit: New limit value (physical address)
 342  */
 343 void memblock_set_current_limit(phys_addr_t limit);
 344
 345
 346 phys_addr_t memblock_get_current_limit(void);
 347
 348 /*
 349  * pfn conversion functions
 350  *
 351  * While the memory MEMBLOCKs should always be page aligned, the reserved
 352  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 353  * idea of what they return for such non aligned MEMBLOCKs.
 354  */
 355
 356 /**
 357  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 358  * @reg: memblock_region structure
 359  */
 360 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 361 {
 362         return PFN_UP(reg->base);
 363 }
 364
 365 /**
 366  * memblock_region_memory_end_pfn - Return the end_pfn this region
 367  * @reg: memblock_region structure
 368  */
 369 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 370 {
 371         return PFN_DOWN(reg->base + reg->size);
 372 }
 373
 374 /**
 375  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 376  * @reg: memblock_region structure
 377  */
 378 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 379 {
 380         return PFN_DOWN(reg->base);
 381 }
 382
 383 /**
 384  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 385  * @reg: memblock_region structure
 386  */
 387 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 388 {
 389         return PFN_UP(reg->base + reg->size);
 390 }
 391
 392 #define for_each_memblock(memblock_type, region)                                        \
 393         for (region = memblock.memblock_type.regions;                                   \
 394              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 395              region++)
 396
 397 #define for_each_memblock_type(memblock_type, rgn)                      \
 398         for (idx = 0, rgn = &memblock_type->regions[0];                 \
 399              idx < memblock_type->cnt;                                  \
 400              idx++, rgn = &memblock_type->regions[idx])
 401
 402 #ifdef CONFIG_MEMTEST
 403 extern void early_memtest(phys_addr_t start, phys_addr_t end);
 404 #else
 405 static inline void early_memtest(phys_addr_t start, phys_addr_t end)
 406 {
 407 }
 408 #endif
 409
 410 extern unsigned long memblock_reserved_memory_within(phys_addr_t start_addr,
 411                 phys_addr_t end_addr);
 412 #else
 413 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 414 {
 415         return 0;
 416 }
 417
 418 static inline unsigned long memblock_reserved_memory_within(phys_addr_t start_addr,
 419                 phys_addr_t end_addr)
 420 {
 421         return 0;
 422 }
 423
 424 #endif /* CONFIG_HAVE_MEMBLOCK */
 425
 426 #endif /* __KERNEL__ */
 427
 428 #endif /* _LINUX_MEMBLOCK_H */