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