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 struct memblock_region {
  23         phys_addr_t base;
  24         phys_addr_t size;
  25 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
  26         int nid;
  27 #endif
  28 };
  29
  30 struct memblock_type {
  31         unsigned long cnt;      /* number of regions */
  32         unsigned long max;      /* size of the allocated array */
  33         phys_addr_t total_size; /* size of all regions */
  34         struct memblock_region *regions;
  35 };
  36
  37 struct memblock {
  38         bool bottom_up;  /* is bottom up direction? */
  39         phys_addr_t current_limit;
  40         struct memblock_type memory;
  41         struct memblock_type reserved;
  42 };
  43
  44 extern struct memblock memblock;
  45 extern int memblock_debug;
  46
  47 #define memblock_dbg(fmt, ...) \
  48         if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  49
  50 phys_addr_t memblock_find_in_range_node(phys_addr_t start, phys_addr_t end,
  51                                 phys_addr_t size, phys_addr_t align, int nid);
  52 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
  53                                    phys_addr_t size, phys_addr_t align);
  54 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
  55 void memblock_allow_resize(void);
  56 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
  57 int memblock_add(phys_addr_t base, phys_addr_t size);
  58 int memblock_remove(phys_addr_t base, phys_addr_t size);
  59 int memblock_free(phys_addr_t base, phys_addr_t size);
  60 int memblock_reserve(phys_addr_t base, phys_addr_t size);
  61 void memblock_trim_memory(phys_addr_t align);
  62
  63 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
  64 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
  65                             unsigned long  *end_pfn);
  66 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
  67                           unsigned long *out_end_pfn, int *out_nid);
  68
  69 /**
  70  * for_each_mem_pfn_range - early memory pfn range iterator
  71  * @i: an integer used as loop variable
  72  * @nid: node selector, %MAX_NUMNODES for all nodes
  73  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
  74  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
  75  * @p_nid: ptr to int for nid of the range, can be %NULL
  76  *
  77  * Walks over configured memory ranges.
  78  */
  79 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)           \
  80         for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
  81              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
  82 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
  83
  84 void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start,
  85                            phys_addr_t *out_end, int *out_nid);
  86
  87 /**
  88  * for_each_free_mem_range - iterate through free memblock areas
  89  * @i: u64 used as loop variable
  90  * @nid: node selector, %MAX_NUMNODES for all nodes
  91  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
  92  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
  93  * @p_nid: ptr to int for nid of the range, can be %NULL
  94  *
  95  * Walks over free (memory && !reserved) areas of memblock.  Available as
  96  * soon as memblock is initialized.
  97  */
  98 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid)          \
  99         for (i = 0,                                                     \
 100              __next_free_mem_range(&i, nid, p_start, p_end, p_nid);     \
 101              i != (u64)ULLONG_MAX;                                      \
 102              __next_free_mem_range(&i, nid, p_start, p_end, p_nid))
 103
 104 void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start,
 105                                phys_addr_t *out_end, int *out_nid);
 106
 107 /**
 108  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
 109  * @i: u64 used as loop variable
 110  * @nid: node selector, %MAX_NUMNODES for all nodes
 111  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 112  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 113  * @p_nid: ptr to int for nid of the range, can be %NULL
 114  *
 115  * Walks over free (memory && !reserved) areas of memblock in reverse
 116  * order.  Available as soon as memblock is initialized.
 117  */
 118 #define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid)  \
 119         for (i = (u64)ULLONG_MAX,                                       \
 120              __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid); \
 121              i != (u64)ULLONG_MAX;                                      \
 122              __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid))
 123
 124 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 125 int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid);
 126
 127 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 128 {
 129         r->nid = nid;
 130 }
 131
 132 static inline int memblock_get_region_node(const struct memblock_region *r)
 133 {
 134         return r->nid;
 135 }
 136 #else
 137 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 138 {
 139 }
 140
 141 static inline int memblock_get_region_node(const struct memblock_region *r)
 142 {
 143         return 0;
 144 }
 145 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 146
 147 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 148 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 149
 150 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
 151
 152 #ifdef CONFIG_MOVABLE_NODE
 153 /*
 154  * Set the allocation direction to bottom-up or top-down.
 155  */
 156 static inline void memblock_set_bottom_up(bool enable)
 157 {
 158         memblock.bottom_up = enable;
 159 }
 160
 161 /*
 162  * Check if the allocation direction is bottom-up or not.
 163  * if this is true, that said, memblock will allocate memory
 164  * in bottom-up direction.
 165  */
 166 static inline bool memblock_bottom_up(void)
 167 {
 168         return memblock.bottom_up;
 169 }
 170 #else
 171 static inline void memblock_set_bottom_up(bool enable) {}
 172 static inline bool memblock_bottom_up(void) { return false; }
 173 #endif
 174
 175 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
 176 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 177 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 178
 179 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 180                                 phys_addr_t max_addr);
 181 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 182                                   phys_addr_t max_addr);
 183 phys_addr_t memblock_phys_mem_size(void);
 184 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
 185 phys_addr_t memblock_start_of_DRAM(void);
 186 phys_addr_t memblock_end_of_DRAM(void);
 187 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 188 int memblock_is_memory(phys_addr_t addr);
 189 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 190 int memblock_is_reserved(phys_addr_t addr);
 191 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 192
 193 extern void __memblock_dump_all(void);
 194
 195 static inline void memblock_dump_all(void)
 196 {
 197         if (memblock_debug)
 198                 __memblock_dump_all();
 199 }
 200
 201 /**
 202  * memblock_set_current_limit - Set the current allocation limit to allow
 203  *                         limiting allocations to what is currently
 204  *                         accessible during boot
 205  * @limit: New limit value (physical address)
 206  */
 207 void memblock_set_current_limit(phys_addr_t limit);
 208
 209
 210 /*
 211  * pfn conversion functions
 212  *
 213  * While the memory MEMBLOCKs should always be page aligned, the reserved
 214  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 215  * idea of what they return for such non aligned MEMBLOCKs.
 216  */
 217
 218 /**
 219  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 220  * @reg: memblock_region structure
 221  */
 222 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 223 {
 224         return PFN_UP(reg->base);
 225 }
 226
 227 /**
 228  * memblock_region_memory_end_pfn - Return the end_pfn this region
 229  * @reg: memblock_region structure
 230  */
 231 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 232 {
 233         return PFN_DOWN(reg->base + reg->size);
 234 }
 235
 236 /**
 237  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 238  * @reg: memblock_region structure
 239  */
 240 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 241 {
 242         return PFN_DOWN(reg->base);
 243 }
 244
 245 /**
 246  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 247  * @reg: memblock_region structure
 248  */
 249 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 250 {
 251         return PFN_UP(reg->base + reg->size);
 252 }
 253
 254 #define for_each_memblock(memblock_type, region)                                        \
 255         for (region = memblock.memblock_type.regions;                           \
 256              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 257              region++)
 258
 259
 260 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
 261 #define __init_memblock __meminit
 262 #define __initdata_memblock __meminitdata
 263 #else
 264 #define __init_memblock
 265 #define __initdata_memblock
 266 #endif
 267
 268 #else
 269 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 270 {
 271         return 0;
 272 }
 273
 274 #endif /* CONFIG_HAVE_MEMBLOCK */
 275
 276 #endif /* __KERNEL__ */
 277
 278 #endif /* _LINUX_MEMBLOCK_H */