LXR linux/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
  22struct 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
  30struct 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
  37struct memblock {
  38        phys_addr_t current_limit;
  39        struct memblock_type memory;
  40        struct memblock_type reserved;
  41};
  42
  43extern struct memblock memblock;
  44extern int memblock_debug;
  45
  46#define memblock_dbg(fmt, ...) \
  47        if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  48
  49phys_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);
  51phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
  52                                   phys_addr_t size, phys_addr_t align);
  53int memblock_free_reserved_regions(void);
  54int memblock_reserve_reserved_regions(void);
  55
  56void memblock_allow_resize(void);
  57int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
  58int memblock_add(phys_addr_t base, phys_addr_t size);
  59int memblock_remove(phys_addr_t base, phys_addr_t size);
  60int memblock_free(phys_addr_t base, phys_addr_t size);
  61int memblock_reserve(phys_addr_t base, phys_addr_t size);
  62
  63#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
  64void __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
  83void __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
 103void __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
 124int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid);
 125
 126static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 127{
 128        r->nid = nid;
 129}
 130
 131static inline int memblock_get_region_node(const struct memblock_region *r)
 132{
 133        return r->nid;
 134}
 135#else
 136static inline void memblock_set_region_node(struct memblock_region *r, int nid)
 137{
 138}
 139
 140static inline int memblock_get_region_node(const struct memblock_region *r)
 141{
 142        return 0;
 143}
 144#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 145
 146phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 147phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 148
 149phys_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
 155phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 156                                phys_addr_t max_addr);
 157phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
 158                                  phys_addr_t max_addr);
 159phys_addr_t memblock_phys_mem_size(void);
 160phys_addr_t memblock_start_of_DRAM(void);
 161phys_addr_t memblock_end_of_DRAM(void);
 162void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 163int memblock_is_memory(phys_addr_t addr);
 164int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 165int memblock_is_reserved(phys_addr_t addr);
 166int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 167
 168extern void __memblock_dump_all(void);
 169
 170static 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 */
 182void 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 */
 197static 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 */
 206static 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 */
 215static 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 */
 224static 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
 244static 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 */
 254