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 #define MEMBLOCK_HOTPLUG        0x1     /* hotpluggable region */
  25
  26 struct memblock_region {
  27         phys_addr_t base;
  28         phys_addr_t size;
  29         unsigned long flags;
  30 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
  31         int nid;
  32 #endif
  33 };
  34
  35 struct memblock_type {
  36         unsigned long cnt;      /* number of regions */
  37         unsigned long max;      /* size of the allocated array */
  38         phys_addr_t total_size; /* size of all regions */
  39         struct memblock_region *regions;
  40 };
  41
  42 struct memblock {
  43         bool bottom_up;  /* is bottom up direction? */
  44         phys_addr_t current_limit;
  45         struct memblock_type memory;
  46         struct memblock_type reserved;
  47 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
  48         struct memblock_type physmem;
  49 #endif
  50 };
  51
  52 extern struct memblock memblock;
  53 extern int memblock_debug;
  54 #ifdef CONFIG_MOVABLE_NODE
  55 /* If movable_node boot option specified */
  56 extern bool movable_node_enabled;
  57 #endif /* CONFIG_MOVABLE_NODE */
  58
  59 #define memblock_dbg(fmt, ...) \
  60         if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  61
  62 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align,
  63                                             phys_addr_t start, phys_addr_t end,
  64                                             int nid);
  65 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
  66                                    phys_addr_t size, phys_addr_t align);
  67 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
  68 phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr);
  69 void memblock_allow_resize(void);
  70 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
  71 int memblock_add(phys_addr_t base, phys_addr_t size);
  72 int memblock_remove(phys_addr_t base, phys_addr_t size);
  73 int memblock_free(phys_addr_t base, phys_addr_t size);
  74 int memblock_reserve(phys_addr_t base, phys_addr_t size);
  75 void memblock_trim_memory(phys_addr_t align);
  76 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
  77 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
  78
  79 /* Low level functions */
  80 int memblock_add_range(struct memblock_type *type,
  81                        phys_addr_t base, phys_addr_t size,
  82                        int nid, unsigned long flags);
  83
  84 int memblock_remove_range(struct memblock_type *type,
  85                           phys_addr_t base,
  86                           phys_addr_t size);
  87
  88 void __next_mem_range(u64 *idx, int nid, struct memblock_type *type_a,
  89                       struct memblock_type *type_b, phys_addr_t *out_start,
  90                       phys_addr_t *out_end, int *out_nid);
  91
  92 void __next_mem_range_rev(u64 *idx, int nid, struct memblock_type *type_a,
  93                           struct memblock_type *type_b, phys_addr_t *out_start,
  94                           phys_addr_t *out_end, int *out_nid);
  95
  96 /**
  97  * for_each_mem_range - iterate through memblock areas from type_a and not
  98  * included in type_b. Or just type_a if type_b is NULL.
  99  * @i: u64 used as loop variable
 100  * @type_a: ptr to memblock_type to iterate
 101  * @type_b: ptr to memblock_type which excludes from the iteration
 102  * @nid: node selector, %NUMA_NO_NODE for all nodes
 103  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 104  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 105  * @p_nid: ptr to int for nid of the range, can be %NULL
 106  */
 107 #define for_each_mem_range(i, type_a, type_b, nid,                      \
 108                            p_start, p_end, p_nid)                       \
 109         for (i = 0, __next_mem_range(&i, nid, type_a, type_b,           \
 110                                      p_start, p_end, p_nid);            \
 111              i != (u64)ULLONG_MAX;                                      \
 112              __next_mem_range(&i, nid, type_a, type_b,                  \
 113                               p_start, p_end, p_nid))
 114
 115 /**
 116  * for_each_mem_range_rev - reverse iterate through memblock areas from
 117  * type_a and not 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  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 123  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 124  * @p_nid: ptr to int for nid of the range, can be %NULL
 125  */
 126 #define for_each_mem_range_rev(i, type_a, type_b, nid,                  \
 127                                p_start, p_end, p_nid)                   \
 128         for (i = (u64)ULLONG_MAX,                                       \
 129                      __next_mem_range_rev(&i, nid, type_a, type_b,      \
 130                                          p_start, p_end, p_nid);        \
 131              i != (u64)ULLONG_MAX;                                      \
 132              __next_mem_range_rev(&i, nid, type_a, type_b,              \
 133                                   p_start, p_end, p_nid))
 134
 135 #ifdef CONFIG_MOVABLE_NODE
 136 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
 137 {
 138         return m->flags & MEMBLOCK_HOTPLUG;
 139 }
 140
 141 static inline bool movable_node_is_enabled(void)
 142 {
 143         return movable_node_enabled;
 144 }
 145 #else
 146 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
 147 {
 148         return false;
 149 }
 150 static inline bool movable_node_is_enabled(void)
 151 {
 152         return false;
 153 }
 154 #endif
 155
 156 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 157 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
 158                             unsigned long  *end_pfn);
 159 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
 160                           unsigned long *out_end_pfn, int *out_nid);
 161
 162 /**
 163  * for_each_mem_pfn_range - early memory pfn range iterator
 164  * @i: an integer used as loop variable
 165  * @nid: node selector, %MAX_NUMNODES for all nodes
 166  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
 167  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
 168  * @p_nid: ptr to int for nid of the range, can be %NULL
 169  *
 170  * Walks over configured memory ranges.
 171  */
 172 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)           \
 173         for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 174              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
 175 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 176
 177 /**
 178  * for_each_free_mem_range - iterate through free memblock areas
 179  * @i: u64 used as loop variable
 180  * @nid: node selector, %NUMA_NO_NODE for all nodes
 181  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 182  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 183  * @p_nid: ptr to int for nid of the range, can be %NULL
 184  *
 185  * Walks over free (memory && !reserved) areas of memblock.  Available as
 186  * soon as memblock is initialized.
 187  */
 188 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid)          \
 189         for_each_mem_range(i, &memblock.memory, &memblock.reserved,     \
 190                            nid, p_start, p_end, p_nid)
 191
 192 /**
 193  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
 194  * @i: u64 used as loop variable
 195  * @nid: node selector, %NUMA_NO_NODE for all nodes
 196  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 197  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 198  * @p_nid: ptr to int for nid of the range, can be %NULL
 199  *
 200  * Walks over free (memory && !reserved) areas of memblock in reverse
 201  * order.  Available as soon as memblock is initialized.
 202  */
 203 #define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid)  \
 204         for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
 205                                nid, p_start, p_end, p_nid)
 206
 207 static inline void memblock_set_region_flags(struct memblock_region *r,
 208                                              unsigned long flags)
 209 {
 210         r->flags |= flags;
 211 }
 212
 213 static inline void memblock_clear_region_flags(struct memblock_region *r,
 214                                                unsigned long flags)
 215 {
 216         r->flags &= ~flags;
 217 }
 218
 219 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 220 int memblock_set_node(phys_addr_t base, phys_addr_t size,
 221                       struct memblock_type *type, int nid);
 222
 223 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 224 {
 225         r->nid = nid;
 226 }
 227
 228 static inline int memblock_get_region_node(const struct memblock_region *r)
 229 {
 230         return r->nid;
 231 }
 232 #else
 233 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 234 {
 235 }
 236
 237 static inline int memblock_get_region_node(const struct memblock_region *r)
 238 {
 239         return 0;
 240 }
 241 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 242
 243 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 244 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 245
 246 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
 247
 248 #ifdef CONFIG_MOVABLE_NODE
 249 /*
 250  * Set the allocation direction to bottom-up or top-down.
 251  */
 252 static inline void __init memblock_set_bottom_up(bool enable)
 253 {
 254         memblock.bottom_up = enable;
 255 }
 256
 257 /*
 258  * Check if the allocation direction is bottom-up or not.
 259  * if this is true, that said, memblock will allocate memory
 260  * in bottom-up direction.
 261  */
 262 static inline bool memblock_bottom_up(void)
 263 {
 264         return memblock.bottom_up;
 265 }
 266 #else
 267 static inline void __init memblock_set_bottom_up(bool enable) {}
 268 static inline bool memblock_bottom_up(void) { return false; }
 269 #endif
 270
 271 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
 272 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 273 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 274
 275 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
 276                                         phys_addr_t start, phys_addr_t end);
 277 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 278                                 phys_addr_t max_addr);
 279 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 280                                   phys_addr_t max_addr);
 281 phys_addr_t memblock_phys_mem_size(void);
 282 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
 283 phys_addr_t memblock_start_of_DRAM(void);
 284 phys_addr_t memblock_end_of_DRAM(void);
 285 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 286 int memblock_is_memory(phys_addr_t addr);
 287 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 288 int memblock_is_reserved(phys_addr_t addr);
 289 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 290
 291 extern void __memblock_dump_all(void);
 292
 293 static inline void memblock_dump_all(void)
 294 {
 295         if (memblock_debug)
 296                 __memblock_dump_all();
 297 }
 298
 299 /**
 300  * memblock_set_current_limit - Set the current allocation limit to allow
 301  *                         limiting allocations to what is currently
 302  *                         accessible during boot
 303  * @limit: New limit value (physical address)
 304  */
 305 void memblock_set_current_limit(phys_addr_t limit);
 306
 307
 308 phys_addr_t memblock_get_current_limit(void);
 309
 310 /*
 311  * pfn conversion functions
 312  *
 313  * While the memory MEMBLOCKs should always be page aligned, the reserved
 314  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 315  * idea of what they return for such non aligned MEMBLOCKs.
 316  */
 317
 318 /**
 319  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 320  * @reg: memblock_region structure
 321  */
 322 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 323 {
 324         return PFN_UP(reg->base);
 325 }
 326
 327 /**
 328  * memblock_region_memory_end_pfn - Return the end_pfn this region
 329  * @reg: memblock_region structure
 330  */
 331 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 332 {
 333         return PFN_DOWN(reg->base + reg->size);
 334 }
 335
 336 /**
 337  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 338  * @reg: memblock_region structure
 339  */
 340 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 341 {
 342         return PFN_DOWN(reg->base);
 343 }
 344
 345 /**
 346  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 347  * @reg: memblock_region structure
 348  */
 349 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 350 {
 351         return PFN_UP(reg->base + reg->size);
 352 }
 353
 354 #define for_each_memblock(memblock_type, region)                                        \
 355         for (region = memblock.memblock_type.regions;                           \
 356              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 357              region++)
 358
 359
 360 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
 361 #define __init_memblock __meminit
 362 #define __initdata_memblock __meminitdata
 363 #else
 364 #define __init_memblock
 365 #define __initdata_memblock
 366 #endif
 367
 368 #else
 369 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 370 {
 371         return 0;
 372 }
 373
 374 #endif /* CONFIG_HAVE_MEMBLOCK */
 375
 376 #endif /* __KERNEL__ */
 377
 378 #endif /* _LINUX_MEMBLOCK_H */