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
  61 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
  62 #define __init_memblock __meminit
  63 #define __initdata_memblock __meminitdata
  64 void memblock_discard(void);
  65 #else
  66 #define __init_memblock
  67 #define __initdata_memblock
  68 #endif
  69
  70 #define memblock_dbg(fmt, ...) \
  71         if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  72
  73 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align,
  74                                         phys_addr_t start, phys_addr_t end,
  75                                         int nid, ulong flags);
  76 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
  77                                    phys_addr_t size, phys_addr_t align);
  78 void memblock_allow_resize(void);
  79 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
  80 int memblock_add(phys_addr_t base, phys_addr_t size);
  81 int memblock_remove(phys_addr_t base, phys_addr_t size);
  82 int memblock_free(phys_addr_t base, phys_addr_t size);
  83 int memblock_reserve(phys_addr_t base, phys_addr_t size);
  84 void memblock_trim_memory(phys_addr_t align);
  85 bool memblock_overlaps_region(struct memblock_type *type,
  86                               phys_addr_t base, phys_addr_t size);
  87 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
  88 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
  89 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
  90 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
  91 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
  92 ulong choose_memblock_flags(void);
  93
  94 /* Low level functions */
  95 int memblock_add_range(struct memblock_type *type,
  96                        phys_addr_t base, phys_addr_t size,
  97                        int nid, unsigned long flags);
  98
  99 void __next_mem_range(u64 *idx, int nid, ulong flags,
 100                       struct memblock_type *type_a,
 101                       struct memblock_type *type_b, phys_addr_t *out_start,
 102                       phys_addr_t *out_end, int *out_nid);
 103
 104 void __next_mem_range_rev(u64 *idx, int nid, ulong flags,
 105                           struct memblock_type *type_a,
 106                           struct memblock_type *type_b, phys_addr_t *out_start,
 107                           phys_addr_t *out_end, int *out_nid);
 108
 109 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start,
 110                                 phys_addr_t *out_end);
 111
 112 void __memblock_free_early(phys_addr_t base, phys_addr_t size);
 113 void __memblock_free_late(phys_addr_t base, phys_addr_t size);
 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 memblock_is_mirror(struct memblock_region *m)
 176 {
 177         return m->flags & MEMBLOCK_MIRROR;
 178 }
 179
 180 static inline bool memblock_is_nomap(struct memblock_region *m)
 181 {
 182         return m->flags & MEMBLOCK_NOMAP;
 183 }
 184
 185 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 186 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
 187                             unsigned long  *end_pfn);
 188 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
 189                           unsigned long *out_end_pfn, int *out_nid);
 190
 191 /**
 192  * for_each_mem_pfn_range - early memory pfn range iterator
 193  * @i: an integer used as loop variable
 194  * @nid: node selector, %MAX_NUMNODES for all nodes
 195  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
 196  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
 197  * @p_nid: ptr to int for nid of the range, can be %NULL
 198  *
 199  * Walks over configured memory ranges.
 200  */
 201 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)           \
 202         for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 203              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
 204 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 205
 206 /**
 207  * for_each_free_mem_range - iterate through free memblock areas
 208  * @i: u64 used as loop variable
 209  * @nid: node selector, %NUMA_NO_NODE for all nodes
 210  * @flags: pick from blocks based on memory attributes
 211  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 212  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 213  * @p_nid: ptr to int for nid of the range, can be %NULL
 214  *
 215  * Walks over free (memory && !reserved) areas of memblock.  Available as
 216  * soon as memblock is initialized.
 217  */
 218 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid)   \
 219         for_each_mem_range(i, &memblock.memory, &memblock.reserved,     \
 220                            nid, flags, p_start, p_end, p_nid)
 221
 222 /**
 223  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
 224  * @i: u64 used as loop variable
 225  * @nid: node selector, %NUMA_NO_NODE for all nodes
 226  * @flags: pick from blocks based on memory attributes
 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  * @p_nid: ptr to int for nid of the range, can be %NULL
 230  *
 231  * Walks over free (memory && !reserved) areas of memblock in reverse
 232  * order.  Available as soon as memblock is initialized.
 233  */
 234 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end,  \
 235                                         p_nid)                          \
 236         for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
 237                                nid, flags, p_start, p_end, p_nid)
 238
 239 /**
 240  * for_each_resv_unavail_range - iterate through reserved and unavailable memory
 241  * @i: u64 used as loop variable
 242  * @flags: pick from blocks based on memory attributes
 243  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 244  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 245  *
 246  * Walks over unavailable but reserved (reserved && !memory) areas of memblock.
 247  * Available as soon as memblock is initialized.
 248  * Note: because this memory does not belong to any physical node, flags and
 249  * nid arguments do not make sense and thus not exported as arguments.
 250  */
 251 #define for_each_resv_unavail_range(i, p_start, p_end)                  \
 252         for_each_mem_range(i, &memblock.reserved, &memblock.memory,     \
 253                            NUMA_NO_NODE, MEMBLOCK_NONE, p_start, p_end, NULL)
 254
 255 static inline void memblock_set_region_flags(struct memblock_region *r,
 256                                              unsigned long flags)
 257 {
 258         r->flags |= flags;
 259 }
 260
 261 static inline void memblock_clear_region_flags(struct memblock_region *r,
 262                                                unsigned long flags)
 263 {
 264         r->flags &= ~flags;
 265 }
 266
 267 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 268 int memblock_set_node(phys_addr_t base, phys_addr_t size,
 269                       struct memblock_type *type, int nid);
 270
 271 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 272 {
 273         r->nid = nid;
 274 }
 275
 276 static inline int memblock_get_region_node(const struct memblock_region *r)
 277 {
 278         return r->nid;
 279 }
 280 #else
 281 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 282 {
 283 }
 284
 285 static inline int memblock_get_region_node(const struct memblock_region *r)
 286 {
 287         return 0;
 288 }
 289 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 290
 291 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 292 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 293
 294 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
 295
 296 /*
 297  * Set the allocation direction to bottom-up or top-down.
 298  */
 299 static inline void __init memblock_set_bottom_up(bool enable)
 300 {
 301         memblock.bottom_up = enable;
 302 }
 303
 304 /*
 305  * Check if the allocation direction is bottom-up or not.
 306  * if this is true, that said, memblock will allocate memory
 307  * in bottom-up direction.
 308  */
 309 static inline bool memblock_bottom_up(void)
 310 {
 311         return memblock.bottom_up;
 312 }
 313
 314 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
 315 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 316 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 317
 318 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
 319                                         phys_addr_t start, phys_addr_t end,
 320                                         ulong flags);
 321 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 322                                 phys_addr_t max_addr);
 323 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 324                                   phys_addr_t max_addr);
 325 phys_addr_t memblock_phys_mem_size(void);
 326 phys_addr_t memblock_reserved_size(void);
 327 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
 328 phys_addr_t memblock_start_of_DRAM(void);
 329 phys_addr_t memblock_end_of_DRAM(void);
 330 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 331 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
 332 void memblock_mem_limit_remove_map(phys_addr_t limit);
 333 bool memblock_is_memory(phys_addr_t addr);
 334 int memblock_is_map_memory(phys_addr_t addr);
 335 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 336 bool memblock_is_reserved(phys_addr_t addr);
 337 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 338
 339 extern void __memblock_dump_all(void);
 340
 341 static inline void memblock_dump_all(void)
 342 {
 343         if (memblock_debug)
 344                 __memblock_dump_all();
 345 }
 346
 347 /**
 348  * memblock_set_current_limit - Set the current allocation limit to allow
 349  *                         limiting allocations to what is currently
 350  *                         accessible during boot
 351  * @limit: New limit value (physical address)
 352  */
 353 void memblock_set_current_limit(phys_addr_t limit);
 354
 355
 356 phys_addr_t memblock_get_current_limit(void);
 357
 358 /*
 359  * pfn conversion functions
 360  *
 361  * While the memory MEMBLOCKs should always be page aligned, the reserved
 362  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 363  * idea of what they return for such non aligned MEMBLOCKs.
 364  */
 365
 366 /**
 367  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 368  * @reg: memblock_region structure
 369  */
 370 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 371 {
 372         return PFN_UP(reg->base);
 373 }
 374
 375 /**
 376  * memblock_region_memory_end_pfn - Return the end_pfn this region
 377  * @reg: memblock_region structure
 378  */
 379 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 380 {
 381         return PFN_DOWN(reg->base + reg->size);
 382 }
 383
 384 /**
 385  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 386  * @reg: memblock_region structure
 387  */
 388 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 389 {
 390         return PFN_DOWN(reg->base);
 391 }
 392
 393 /**
 394  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 395  * @reg: memblock_region structure
 396  */
 397 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 398 {
 399         return PFN_UP(reg->base + reg->size);
 400 }
 401
 402 #define for_each_memblock(memblock_type, region)                                        \
 403         for (region = memblock.memblock_type.regions;                                   \
 404              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 405              region++)
 406
 407 #define for_each_memblock_type(i, memblock_type, rgn)                   \
 408         for (i = 0, rgn = &memblock_type->regions[0];                   \
 409              i < memblock_type->cnt;                                    \
 410              i++, rgn = &memblock_type->regions[i])
 411
 412 #ifdef CONFIG_MEMTEST
 413 extern void early_memtest(phys_addr_t start, phys_addr_t end);
 414 #else
 415 static inline void early_memtest(phys_addr_t start, phys_addr_t end)
 416 {
 417 }
 418 #endif
 419
 420 extern unsigned long memblock_reserved_memory_within(phys_addr_t start_addr,
 421                 phys_addr_t end_addr);
 422 #else
 423 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 424 {
 425         return 0;
 426 }
 427
 428 static inline unsigned long memblock_reserved_memory_within(phys_addr_t start_addr,
 429                 phys_addr_t end_addr)
 430 {
 431         return 0;
 432 }
 433
 434 #endif /* CONFIG_HAVE_MEMBLOCK */
 435
 436 #endif /* __KERNEL__ */
 437
 438 #endif /* _LINUX_MEMBLOCK_H */