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 };
  28
  29 struct memblock_region {
  30         phys_addr_t base;
  31         phys_addr_t size;
  32         unsigned long flags;
  33 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
  34         int nid;
  35 #endif
  36 };
  37
  38 struct memblock_type {
  39         unsigned long cnt;      /* number of regions */
  40         unsigned long max;      /* size of the allocated array */
  41         phys_addr_t total_size; /* size of all regions */
  42         struct memblock_region *regions;
  43 };
  44
  45 struct memblock {
  46         bool bottom_up;  /* is bottom up direction? */
  47         phys_addr_t current_limit;
  48         struct memblock_type memory;
  49         struct memblock_type reserved;
  50 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
  51         struct memblock_type physmem;
  52 #endif
  53 };
  54
  55 extern struct memblock memblock;
  56 extern int memblock_debug;
  57 #ifdef CONFIG_MOVABLE_NODE
  58 /* If movable_node boot option specified */
  59 extern bool movable_node_enabled;
  60 #endif /* CONFIG_MOVABLE_NODE */
  61
  62 #define memblock_dbg(fmt, ...) \
  63         if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  64
  65 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align,
  66                                             phys_addr_t start, phys_addr_t end,
  67                                             int nid, ulong flags);
  68 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
  69                                    phys_addr_t size, phys_addr_t align);
  70 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
  71 phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr);
  72 void memblock_allow_resize(void);
  73 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
  74 int memblock_add(phys_addr_t base, phys_addr_t size);
  75 int memblock_remove(phys_addr_t base, phys_addr_t size);
  76 int memblock_free(phys_addr_t base, phys_addr_t size);
  77 int memblock_reserve(phys_addr_t base, phys_addr_t size);
  78 void memblock_trim_memory(phys_addr_t align);
  79 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
  80 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
  81
  82 /* Low level functions */
  83 int memblock_add_range(struct memblock_type *type,
  84                        phys_addr_t base, phys_addr_t size,
  85                        int nid, unsigned long flags);
  86
  87 int memblock_remove_range(struct memblock_type *type,
  88                           phys_addr_t base,
  89                           phys_addr_t size);
  90
  91 void __next_mem_range(u64 *idx, int nid, ulong flags,
  92                       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 void __next_mem_range_rev(u64 *idx, int nid, ulong flags,
  97                           struct memblock_type *type_a,
  98                           struct memblock_type *type_b, phys_addr_t *out_start,
  99                           phys_addr_t *out_end, int *out_nid);
 100
 101 /**
 102  * for_each_mem_range - iterate through memblock areas from type_a and not
 103  * included in type_b. Or just type_a if type_b is NULL.
 104  * @i: u64 used as loop variable
 105  * @type_a: ptr to memblock_type to iterate
 106  * @type_b: ptr to memblock_type which excludes from the iteration
 107  * @nid: node selector, %NUMA_NO_NODE for all nodes
 108  * @flags: pick from blocks based on memory attributes
 109  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 110  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 111  * @p_nid: ptr to int for nid of the range, can be %NULL
 112  */
 113 #define for_each_mem_range(i, type_a, type_b, nid, flags,               \
 114                            p_start, p_end, p_nid)                       \
 115         for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b,    \
 116                                      p_start, p_end, p_nid);            \
 117              i != (u64)ULLONG_MAX;                                      \
 118              __next_mem_range(&i, nid, flags, type_a, type_b,           \
 119                               p_start, p_end, p_nid))
 120
 121 /**
 122  * for_each_mem_range_rev - reverse iterate through memblock areas from
 123  * type_a and not included in type_b. Or just type_a if type_b is NULL.
 124  * @i: u64 used as loop variable
 125  * @type_a: ptr to memblock_type to iterate
 126  * @type_b: ptr to memblock_type which excludes from the iteration
 127  * @nid: node selector, %NUMA_NO_NODE for all nodes
 128  * @flags: pick from blocks based on memory attributes
 129  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 130  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 131  * @p_nid: ptr to int for nid of the range, can be %NULL
 132  */
 133 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags,           \
 134                                p_start, p_end, p_nid)                   \
 135         for (i = (u64)ULLONG_MAX,                                       \
 136                      __next_mem_range_rev(&i, nid, flags, type_a, type_b,\
 137                                          p_start, p_end, p_nid);        \
 138              i != (u64)ULLONG_MAX;                                      \
 139              __next_mem_range_rev(&i, nid, flags, type_a, type_b,       \
 140                                   p_start, p_end, p_nid))
 141
 142 #ifdef CONFIG_MOVABLE_NODE
 143 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
 144 {
 145         return m->flags & MEMBLOCK_HOTPLUG;
 146 }
 147
 148 static inline bool movable_node_is_enabled(void)
 149 {
 150         return movable_node_enabled;
 151 }
 152 #else
 153 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
 154 {
 155         return false;
 156 }
 157 static inline bool movable_node_is_enabled(void)
 158 {
 159         return false;
 160 }
 161 #endif
 162
 163 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 164 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
 165                             unsigned long  *end_pfn);
 166 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
 167                           unsigned long *out_end_pfn, int *out_nid);
 168
 169 /**
 170  * for_each_mem_pfn_range - early memory pfn range iterator
 171  * @i: an integer used as loop variable
 172  * @nid: node selector, %MAX_NUMNODES for all nodes
 173  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
 174  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
 175  * @p_nid: ptr to int for nid of the range, can be %NULL
 176  *
 177  * Walks over configured memory ranges.
 178  */
 179 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)           \
 180         for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 181              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
 182 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 183
 184 /**
 185  * for_each_free_mem_range - iterate through free memblock areas
 186  * @i: u64 used as loop variable
 187  * @nid: node selector, %NUMA_NO_NODE for all nodes
 188  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 189  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 190  * @p_nid: ptr to int for nid of the range, can be %NULL
 191  * @flags: pick from blocks based on memory attributes
 192  *
 193  * Walks over free (memory && !reserved) areas of memblock.  Available as
 194  * soon as memblock is initialized.
 195  */
 196 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid)   \
 197         for_each_mem_range(i, &memblock.memory, &memblock.reserved,     \
 198                            nid, flags, p_start, p_end, p_nid)
 199
 200 /**
 201  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
 202  * @i: u64 used as loop variable
 203  * @nid: node selector, %NUMA_NO_NODE for all nodes
 204  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 205  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 206  * @p_nid: ptr to int for nid of the range, can be %NULL
 207  * @flags: pick from blocks based on memory attributes
 208  *
 209  * Walks over free (memory && !reserved) areas of memblock in reverse
 210  * order.  Available as soon as memblock is initialized.
 211  */
 212 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end,  \
 213                                         p_nid)                          \
 214         for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
 215                                nid, flags, p_start, p_end, p_nid)
 216
 217 static inline void memblock_set_region_flags(struct memblock_region *r,
 218                                              unsigned long flags)
 219 {
 220         r->flags |= flags;
 221 }
 222
 223 static inline void memblock_clear_region_flags(struct memblock_region *r,
 224                                                unsigned long flags)
 225 {
 226         r->flags &= ~flags;
 227 }
 228
 229 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 230 int memblock_set_node(phys_addr_t base, phys_addr_t size,
 231                       struct memblock_type *type, int nid);
 232
 233 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 234 {
 235         r->nid = nid;
 236 }
 237
 238 static inline int memblock_get_region_node(const struct memblock_region *r)
 239 {
 240         return r->nid;
 241 }
 242 #else
 243 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 244 {
 245 }
 246
 247 static inline int memblock_get_region_node(const struct memblock_region *r)
 248 {
 249         return 0;
 250 }
 251 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 252
 253 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 254 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 255
 256 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
 257
 258 #ifdef CONFIG_MOVABLE_NODE
 259 /*
 260  * Set the allocation direction to bottom-up or top-down.
 261  */
 262 static inline void __init memblock_set_bottom_up(bool enable)
 263 {
 264         memblock.bottom_up = enable;
 265 }
 266
 267 /*
 268  * Check if the allocation direction is bottom-up or not.
 269  * if this is true, that said, memblock will allocate memory
 270  * in bottom-up direction.
 271  */
 272 static inline bool memblock_bottom_up(void)
 273 {
 274         return memblock.bottom_up;
 275 }
 276 #else
 277 static inline void __init memblock_set_bottom_up(bool enable) {}
 278 static inline bool memblock_bottom_up(void) { return false; }
 279 #endif
 280
 281 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
 282 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 283 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 284
 285 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
 286                                         phys_addr_t start, phys_addr_t end,
 287                                         ulong flags);
 288 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 289                                 phys_addr_t max_addr);
 290 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 291                                   phys_addr_t max_addr);
 292 phys_addr_t memblock_phys_mem_size(void);
 293 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
 294 phys_addr_t memblock_start_of_DRAM(void);
 295 phys_addr_t memblock_end_of_DRAM(void);
 296 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 297 int memblock_is_memory(phys_addr_t addr);
 298 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 299 int memblock_is_reserved(phys_addr_t addr);
 300 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 301
 302 extern void __memblock_dump_all(void);
 303
 304 static inline void memblock_dump_all(void)
 305 {
 306         if (memblock_debug)
 307                 __memblock_dump_all();
 308 }
 309
 310 /**
 311  * memblock_set_current_limit - Set the current allocation limit to allow
 312  *                         limiting allocations to what is currently
 313  *                         accessible during boot
 314  * @limit: New limit value (physical address)
 315  */
 316 void memblock_set_current_limit(phys_addr_t limit);
 317
 318
 319 phys_addr_t memblock_get_current_limit(void);
 320
 321 /*
 322  * pfn conversion functions
 323  *
 324  * While the memory MEMBLOCKs should always be page aligned, the reserved
 325  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 326  * idea of what they return for such non aligned MEMBLOCKs.
 327  */
 328
 329 /**
 330  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 331  * @reg: memblock_region structure
 332  */
 333 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 334 {
 335         return PFN_UP(reg->base);
 336 }
 337
 338 /**
 339  * memblock_region_memory_end_pfn - Return the end_pfn this region
 340  * @reg: memblock_region structure
 341  */
 342 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 343 {
 344         return PFN_DOWN(reg->base + reg->size);
 345 }
 346
 347 /**
 348  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 349  * @reg: memblock_region structure
 350  */
 351 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 352 {
 353         return PFN_DOWN(reg->base);
 354 }
 355
 356 /**
 357  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 358  * @reg: memblock_region structure
 359  */
 360 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 361 {
 362         return PFN_UP(reg->base + reg->size);
 363 }
 364
 365 #define for_each_memblock(memblock_type, region)                                        \
 366         for (region = memblock.memblock_type.regions;                           \
 367              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 368              region++)
 369
 370
 371 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
 372 #define __init_memblock __meminit
 373 #define __initdata_memblock __meminitdata
 374 #else
 375 #define __init_memblock
 376 #define __initdata_memblock
 377 #endif
 378
 379 #ifdef CONFIG_MEMTEST
 380 extern void early_memtest(phys_addr_t start, phys_addr_t end);
 381 #else
 382 static inline void early_memtest(phys_addr_t start, phys_addr_t end)
 383 {
 384 }
 385 #endif
 386
 387 #else
 388 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 389 {
 390         return 0;
 391 }
 392
 393 #endif /* CONFIG_HAVE_MEMBLOCK */
 394
 395 #endif /* __KERNEL__ */
 396
 397 #endif /* _LINUX_MEMBLOCK_H */