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 unsigned long memblock_next_valid_pfn(unsigned long pfn, unsigned long max_pfn);
 191
 192 /**
 193  * for_each_mem_pfn_range - early memory pfn range iterator
 194  * @i: an integer used as loop variable
 195  * @nid: node selector, %MAX_NUMNODES for all nodes
 196  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
 197  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
 198  * @p_nid: ptr to int for nid of the range, can be %NULL
 199  *
 200  * Walks over configured memory ranges.
 201  */
 202 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)           \
 203         for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 204              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
 205 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 206
 207 /**
 208  * for_each_free_mem_range - iterate through free memblock areas
 209  * @i: u64 used as loop variable
 210  * @nid: node selector, %NUMA_NO_NODE for all nodes
 211  * @flags: pick from blocks based on memory attributes
 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  *
 216  * Walks over free (memory && !reserved) areas of memblock.  Available as
 217  * soon as memblock is initialized.
 218  */
 219 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid)   \
 220         for_each_mem_range(i, &memblock.memory, &memblock.reserved,     \
 221                            nid, flags, p_start, p_end, p_nid)
 222
 223 /**
 224  * for_each_free_mem_range_reverse - rev-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 in reverse
 233  * order.  Available as soon as memblock is initialized.
 234  */
 235 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end,  \
 236                                         p_nid)                          \
 237         for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
 238                                nid, flags, p_start, p_end, p_nid)
 239
 240 static inline void memblock_set_region_flags(struct memblock_region *r,
 241                                              unsigned long flags)
 242 {
 243         r->flags |= flags;
 244 }
 245
 246 static inline void memblock_clear_region_flags(struct memblock_region *r,
 247                                                unsigned long flags)
 248 {
 249         r->flags &= ~flags;
 250 }
 251
 252 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 253 int memblock_set_node(phys_addr_t base, phys_addr_t size,
 254                       struct memblock_type *type, int nid);
 255
 256 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 257 {
 258         r->nid = nid;
 259 }
 260
 261 static inline int memblock_get_region_node(const struct memblock_region *r)
 262 {
 263         return r->nid;
 264 }
 265 #else
 266 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 267 {
 268 }
 269
 270 static inline int memblock_get_region_node(const struct memblock_region *r)
 271 {
 272         return 0;
 273 }
 274 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 275
 276 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 277 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 278
 279 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
 280
 281 /*
 282  * Set the allocation direction to bottom-up or top-down.
 283  */
 284 static inline void __init memblock_set_bottom_up(bool enable)
 285 {
 286         memblock.bottom_up = enable;
 287 }
 288
 289 /*
 290  * Check if the allocation direction is bottom-up or not.
 291  * if this is true, that said, memblock will allocate memory
 292  * in bottom-up direction.
 293  */
 294 static inline bool memblock_bottom_up(void)
 295 {
 296         return memblock.bottom_up;
 297 }
 298
 299 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
 300 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 301 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 302
 303 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
 304                                         phys_addr_t start, phys_addr_t end,
 305                                         ulong flags);
 306 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 307                                 phys_addr_t max_addr);
 308 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 309                                   phys_addr_t max_addr);
 310 phys_addr_t memblock_phys_mem_size(void);
 311 phys_addr_t memblock_reserved_size(void);
 312 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
 313 phys_addr_t memblock_start_of_DRAM(void);
 314 phys_addr_t memblock_end_of_DRAM(void);
 315 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 316 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
 317 void memblock_mem_limit_remove_map(phys_addr_t limit);
 318 bool memblock_is_memory(phys_addr_t addr);
 319 int memblock_is_map_memory(phys_addr_t addr);
 320 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 321 bool memblock_is_reserved(phys_addr_t addr);
 322 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 323
 324 extern void __memblock_dump_all(void);
 325
 326 static inline void memblock_dump_all(void)
 327 {
 328         if (memblock_debug)
 329                 __memblock_dump_all();
 330 }
 331
 332 /**
 333  * memblock_set_current_limit - Set the current allocation limit to allow
 334  *                         limiting allocations to what is currently
 335  *                         accessible during boot
 336  * @limit: New limit value (physical address)
 337  */
 338 void memblock_set_current_limit(phys_addr_t limit);
 339
 340
 341 phys_addr_t memblock_get_current_limit(void);
 342
 343 /*
 344  * pfn conversion functions
 345  *
 346  * While the memory MEMBLOCKs should always be page aligned, the reserved
 347  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 348  * idea of what they return for such non aligned MEMBLOCKs.
 349  */
 350
 351 /**
 352  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 353  * @reg: memblock_region structure
 354  */
 355 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 356 {
 357         return PFN_UP(reg->base);
 358 }
 359
 360 /**
 361  * memblock_region_memory_end_pfn - Return the end_pfn this region
 362  * @reg: memblock_region structure
 363  */
 364 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 365 {
 366         return PFN_DOWN(reg->base + reg->size);
 367 }
 368
 369 /**
 370  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 371  * @reg: memblock_region structure
 372  */
 373 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 374 {
 375         return PFN_DOWN(reg->base);
 376 }
 377
 378 /**
 379  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 380  * @reg: memblock_region structure
 381  */
 382 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 383 {
 384         return PFN_UP(reg->base + reg->size);
 385 }
 386
 387 #define for_each_memblock(memblock_type, region)                                        \
 388         for (region = memblock.memblock_type.regions;                                   \
 389              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 390              region++)
 391
 392 #define for_each_memblock_type(memblock_type, rgn)                      \
 393         for (idx = 0, rgn = &memblock_type->regions[0];                 \
 394              idx < memblock_type->cnt;                                  \
 395              idx++, rgn = &memblock_type->regions[idx])
 396
 397 #ifdef CONFIG_MEMTEST
 398 extern void early_memtest(phys_addr_t start, phys_addr_t end);
 399 #else
 400 static inline void early_memtest(phys_addr_t start, phys_addr_t end)
 401 {
 402 }
 403 #endif
 404
 405 extern unsigned long memblock_reserved_memory_within(phys_addr_t start_addr,
 406                 phys_addr_t end_addr);
 407 #else
 408 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 409 {
 410         return 0;
 411 }
 412
 413 static inline unsigned long memblock_reserved_memory_within(phys_addr_t start_addr,
 414                 phys_addr_t end_addr)
 415 {
 416         return 0;
 417 }
 418
 419 #endif /* CONFIG_HAVE_MEMBLOCK */
 420
 421 #endif /* __KERNEL__ */
 422
 423 #endif /* _LINUX_MEMBLOCK_H */