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