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