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
  22 /* Definition of memblock flags. */
  23 #define MEMBLOCK_HOTPLUG        0x1     /* hotpluggable region */
  24
  25 struct memblock_region {
  26         phys_addr_t base;
  27         phys_addr_t size;
  28         unsigned long flags;
  29 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
  30         int nid;
  31 #endif
  32 };
  33
  34 struct memblock_type {
  35         unsigned long cnt;      /* number of regions */
  36         unsigned long max;      /* size of the allocated array */
  37         phys_addr_t total_size; /* size of all regions */
  38         struct memblock_region *regions;
  39 };
  40
  41 struct memblock {
  42         bool bottom_up;  /* is bottom up direction? */
  43         phys_addr_t current_limit;
  44         struct memblock_type memory;
  45         struct memblock_type reserved;
  46 };
  47
  48 extern struct memblock memblock;
  49 extern int memblock_debug;
  50 #ifdef CONFIG_MOVABLE_NODE
  51 /* If movable_node boot option specified */
  52 extern bool movable_node_enabled;
  53 #endif /* CONFIG_MOVABLE_NODE */
  54
  55 #define memblock_dbg(fmt, ...) \
  56         if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  57
  58 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align,
  59                                             phys_addr_t start, phys_addr_t end,
  60                                             int nid);
  61 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
  62                                    phys_addr_t size, phys_addr_t align);
  63 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
  64 phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr);
  65 void memblock_allow_resize(void);
  66 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
  67 int memblock_add(phys_addr_t base, phys_addr_t size);
  68 int memblock_remove(phys_addr_t base, phys_addr_t size);
  69 int memblock_free(phys_addr_t base, phys_addr_t size);
  70 int memblock_reserve(phys_addr_t base, phys_addr_t size);
  71 void memblock_trim_memory(phys_addr_t align);
  72 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
  73 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
  74 #ifdef CONFIG_MOVABLE_NODE
  75 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
  76 {
  77         return m->flags & MEMBLOCK_HOTPLUG;
  78 }
  79
  80 static inline bool movable_node_is_enabled(void)
  81 {
  82         return movable_node_enabled;
  83 }
  84 #else
  85 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
  86 {
  87         return false;
  88 }
  89 static inline bool movable_node_is_enabled(void)
  90 {
  91         return false;
  92 }
  93 #endif
  94
  95 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
  96 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
  97                             unsigned long  *end_pfn);
  98 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
  99                           unsigned long *out_end_pfn, int *out_nid);
 100
 101 /**
 102  * for_each_mem_pfn_range - early memory pfn range iterator
 103  * @i: an integer used as loop variable
 104  * @nid: node selector, %MAX_NUMNODES for all nodes
 105  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
 106  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
 107  * @p_nid: ptr to int for nid of the range, can be %NULL
 108  *
 109  * Walks over configured memory ranges.
 110  */
 111 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)           \
 112         for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 113              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
 114 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 115
 116 void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start,
 117                            phys_addr_t *out_end, int *out_nid);
 118
 119 /**
 120  * for_each_free_mem_range - iterate through free memblock areas
 121  * @i: u64 used as loop variable
 122  * @nid: node selector, %NUMA_NO_NODE for all nodes
 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  * Walks over free (memory && !reserved) areas of memblock.  Available as
 128  * soon as memblock is initialized.
 129  */
 130 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid)          \
 131         for (i = 0,                                                     \
 132              __next_free_mem_range(&i, nid, p_start, p_end, p_nid);     \
 133              i != (u64)ULLONG_MAX;                                      \
 134              __next_free_mem_range(&i, nid, p_start, p_end, p_nid))
 135
 136 void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start,
 137                                phys_addr_t *out_end, int *out_nid);
 138
 139 /**
 140  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
 141  * @i: u64 used as loop variable
 142  * @nid: node selector, %NUMA_NO_NODE for all nodes
 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  * Walks over free (memory && !reserved) areas of memblock in reverse
 148  * order.  Available as soon as memblock is initialized.
 149  */
 150 #define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid)  \
 151         for (i = (u64)ULLONG_MAX,                                       \
 152              __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid); \
 153              i != (u64)ULLONG_MAX;                                      \
 154              __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid))
 155
 156 static inline void memblock_set_region_flags(struct memblock_region *r,
 157                                              unsigned long flags)
 158 {
 159         r->flags |= flags;
 160 }
 161
 162 static inline void memblock_clear_region_flags(struct memblock_region *r,
 163                                                unsigned long flags)
 164 {
 165         r->flags &= ~flags;
 166 }
 167
 168 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 169 int memblock_set_node(phys_addr_t base, phys_addr_t size,
 170                       struct memblock_type *type, int nid);
 171
 172 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 173 {
 174         r->nid = nid;
 175 }
 176
 177 static inline int memblock_get_region_node(const struct memblock_region *r)
 178 {
 179         return r->nid;
 180 }
 181 #else
 182 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 183 {
 184 }
 185
 186 static inline int memblock_get_region_node(const struct memblock_region *r)
 187 {
 188         return 0;
 189 }
 190 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 191
 192 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 193 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 194
 195 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
 196
 197 #ifdef CONFIG_MOVABLE_NODE
 198 /*
 199  * Set the allocation direction to bottom-up or top-down.
 200  */
 201 static inline void memblock_set_bottom_up(bool enable)
 202 {
 203         memblock.bottom_up = enable;
 204 }
 205
 206 /*
 207  * Check if the allocation direction is bottom-up or not.
 208  * if this is true, that said, memblock will allocate memory
 209  * in bottom-up direction.
 210  */
 211 static inline bool memblock_bottom_up(void)
 212 {
 213         return memblock.bottom_up;
 214 }
 215 #else
 216 static inline void memblock_set_bottom_up(bool enable) {}
 217 static inline bool memblock_bottom_up(void) { return false; }
 218 #endif
 219
 220 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
 221 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 222 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 223
 224 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 225                                 phys_addr_t max_addr);
 226 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 227                                   phys_addr_t max_addr);
 228 phys_addr_t memblock_phys_mem_size(void);
 229 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
 230 phys_addr_t memblock_start_of_DRAM(void);
 231 phys_addr_t memblock_end_of_DRAM(void);
 232 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 233 int memblock_is_memory(phys_addr_t addr);
 234 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 235 int memblock_is_reserved(phys_addr_t addr);
 236 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 237
 238 extern void __memblock_dump_all(void);
 239
 240 static inline void memblock_dump_all(void)
 241 {
 242         if (memblock_debug)
 243                 __memblock_dump_all();
 244 }
 245
 246 /**
 247  * memblock_set_current_limit - Set the current allocation limit to allow
 248  *                         limiting allocations to what is currently
 249  *                         accessible during boot
 250  * @limit: New limit value (physical address)
 251  */
 252 void memblock_set_current_limit(phys_addr_t limit);
 253
 254
 255 phys_addr_t memblock_get_current_limit(void);
 256
 257 /*
 258  * pfn conversion functions
 259  *
 260  * While the memory MEMBLOCKs should always be page aligned, the reserved
 261  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 262  * idea of what they return for such non aligned MEMBLOCKs.
 263  */
 264
 265 /**
 266  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 267  * @reg: memblock_region structure
 268  */
 269 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 270 {
 271         return PFN_UP(reg->base);
 272 }
 273
 274 /**
 275  * memblock_region_memory_end_pfn - Return the end_pfn this region
 276  * @reg: memblock_region structure
 277  */
 278 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 279 {
 280         return PFN_DOWN(reg->base + reg->size);
 281 }
 282
 283 /**
 284  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 285  * @reg: memblock_region structure
 286  */
 287 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 288 {
 289         return PFN_DOWN(reg->base);
 290 }
 291
 292 /**
 293  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 294  * @reg: memblock_region structure
 295  */
 296 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 297 {
 298         return PFN_UP(reg->base + reg->size);
 299 }
 300
 301 #define for_each_memblock(memblock_type, region)                                        \
 302         for (region = memblock.memblock_type.regions;                           \
 303              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 304              region++)
 305
 306
 307 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
 308 #define __init_memblock __meminit
 309 #define __initdata_memblock __meminitdata
 310 #else
 311 #define __init_memblock
 312 #define __initdata_memblock
 313 #endif
 314
 315 #else
 316 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 317 {
 318         return 0;
 319 }
 320
 321 #endif /* CONFIG_HAVE_MEMBLOCK */
 322
 323 #endif /* __KERNEL__ */
 324
 325 #endif /* _LINUX_MEMBLOCK_H */