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         struct memblock_region *regions;
  34 };
  35
  36 struct memblock {
  37         phys_addr_t current_limit;
  38         phys_addr_t memory_size;        /* Updated by memblock_analyze() */
  39         struct memblock_type memory;
  40         struct memblock_type reserved;
  41 };
  42
  43 extern struct memblock memblock;
  44 extern int memblock_debug;
  45 extern int memblock_can_resize;
  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(phys_addr_t start, phys_addr_t end,
  51                                    phys_addr_t size, phys_addr_t align);
  52 int memblock_free_reserved_regions(void);
  53 int memblock_reserve_reserved_regions(void);
  54
  55 void memblock_init(void);
  56 void memblock_analyze(void);
  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
  62 void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start,
  63                            phys_addr_t *out_end, int *out_nid);
  64
  65 /**
  66  * for_each_free_mem_range - iterate through free memblock areas
  67  * @i: u64 used as loop variable
  68  * @nid: node selector, %MAX_NUMNODES for all nodes
  69  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
  70  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
  71  * @p_nid: ptr to int for nid of the range, can be %NULL
  72  *
  73  * Walks over free (memory && !reserved) areas of memblock.  Available as
  74  * soon as memblock is initialized.
  75  */
  76 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid)          \
  77         for (i = 0,                                                     \
  78              __next_free_mem_range(&i, nid, p_start, p_end, p_nid);     \
  79              i != (u64)ULLONG_MAX;                                      \
  80              __next_free_mem_range(&i, nid, p_start, p_end, p_nid))
  81
  82 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
  83 int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid);
  84
  85 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
  86 {
  87         r->nid = nid;
  88 }
  89
  90 static inline int memblock_get_region_node(const struct memblock_region *r)
  91 {
  92         return r->nid;
  93 }
  94 #else
  95 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
  96 {
  97 }
  98
  99 static inline int memblock_get_region_node(const struct memblock_region *r)
 100 {
 101         return 0;
 102 }
 103 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 104
 105 /* The numa aware allocator is only available if
 106  * CONFIG_ARCH_POPULATES_NODE_MAP is set
 107  */
 108 phys_addr_t memblock_find_in_range_node(phys_addr_t start, phys_addr_t end,
 109                                         phys_addr_t size, phys_addr_t align, int nid);
 110 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 111 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 112
 113 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
 114
 115 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
 116 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
 117 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
 118
 119 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 120                                 phys_addr_t max_addr);
 121 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 122                                   phys_addr_t max_addr);
 123 phys_addr_t memblock_phys_mem_size(void);
 124 phys_addr_t memblock_start_of_DRAM(void);
 125 phys_addr_t memblock_end_of_DRAM(void);
 126 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 127 int memblock_is_memory(phys_addr_t addr);
 128 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 129 int memblock_is_reserved(phys_addr_t addr);
 130 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 131
 132 extern void __memblock_dump_all(void);
 133
 134 static inline void memblock_dump_all(void)
 135 {
 136         if (memblock_debug)
 137                 __memblock_dump_all();
 138 }
 139
 140 /**
 141  * memblock_set_current_limit - Set the current allocation limit to allow
 142  *                         limiting allocations to what is currently
 143  *                         accessible during boot
 144  * @limit: New limit value (physical address)
 145  */
 146 void memblock_set_current_limit(phys_addr_t limit);
 147
 148
 149 /*
 150  * pfn conversion functions
 151  *
 152  * While the memory MEMBLOCKs should always be page aligned, the reserved
 153  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 154  * idea of what they return for such non aligned MEMBLOCKs.
 155  */
 156
 157 /**
 158  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 159  * @reg: memblock_region structure
 160  */
 161 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 162 {
 163         return PFN_UP(reg->base);
 164 }
 165
 166 /**
 167  * memblock_region_memory_end_pfn - Return the end_pfn this region
 168  * @reg: memblock_region structure
 169  */
 170 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 171 {
 172         return PFN_DOWN(reg->base + reg->size);
 173 }
 174
 175 /**
 176  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 177  * @reg: memblock_region structure
 178  */
 179 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 180 {
 181         return PFN_DOWN(reg->base);
 182 }
 183
 184 /**
 185  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 186  * @reg: memblock_region structure
 187  */
 188 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 189 {
 190         return PFN_UP(reg->base + reg->size);
 191 }
 192
 193 #define for_each_memblock(memblock_type, region)                                        \
 194         for (region = memblock.memblock_type.regions;                           \
 195              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 196              region++)
 197
 198
 199 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
 200 #define __init_memblock __meminit
 201 #define __initdata_memblock __meminitdata
 202 #else
 203 #define __init_memblock
 204 #define __initdata_memblock
 205 #endif
 206
 207 #else
 208 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 209 {
 210         return 0;
 211 }
 212
 213 #endif /* CONFIG_HAVE_MEMBLOCK */
 214
 215 #endif /* __KERNEL__ */
 216
 217 #endif /* _LINUX_MEMBLOCK_H */