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 bool bottom_up; /* is bottom up direction? */ 39 phys_addr_t current_limit; 40 struct memblock_type memory; 41 struct memblock_type reserved; 42 }; 43 44 extern struct memblock memblock; 45 extern int memblock_debug; 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_node(phys_addr_t start, phys_addr_t end, 51 phys_addr_t size, phys_addr_t align, int nid); 52 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, 53 phys_addr_t size, phys_addr_t align); 54 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr); 55 void memblock_allow_resize(void); 56 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); 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 void memblock_trim_memory(phys_addr_t align); 62 63 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 64 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 65 unsigned long *end_pfn); 66 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 67 unsigned long *out_end_pfn, int *out_nid); 68 69 /** 70 * for_each_mem_pfn_range - early memory pfn range iterator 71 * @i: an integer used as loop variable 72 * @nid: node selector, %MAX_NUMNODES for all nodes 73 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 74 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 75 * @p_nid: ptr to int for nid of the range, can be %NULL 76 * 77 * Walks over configured memory ranges. 78 */ 79 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 80 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 81 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 82 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 83 84 void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start, 85 phys_addr_t *out_end, int *out_nid); 86 87 /** 88 * for_each_free_mem_range - iterate through free memblock areas 89 * @i: u64 used as loop variable 90 * @nid: node selector, %MAX_NUMNODES for all nodes 91 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 92 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 93 * @p_nid: ptr to int for nid of the range, can be %NULL 94 * 95 * Walks over free (memory && !reserved) areas of memblock. Available as 96 * soon as memblock is initialized. 97 */ 98 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid) \ 99 for (i = 0, \ 100 __next_free_mem_range(&i, nid, p_start, p_end, p_nid); \ 101 i != (u64)ULLONG_MAX; \ 102 __next_free_mem_range(&i, nid, p_start, p_end, p_nid)) 103 104 void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start, 105 phys_addr_t *out_end, int *out_nid); 106 107 /** 108 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 109 * @i: u64 used as loop variable 110 * @nid: node selector, %MAX_NUMNODES for all nodes 111 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 112 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 113 * @p_nid: ptr to int for nid of the range, can be %NULL 114 * 115 * Walks over free (memory && !reserved) areas of memblock in reverse 116 * order. Available as soon as memblock is initialized. 117 */ 118 #define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid) \ 119 for (i = (u64)ULLONG_MAX, \ 120 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid); \ 121 i != (u64)ULLONG_MAX; \ 122 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid)) 123 124 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 125 int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid); 126 127 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 128 { 129 r->nid = nid; 130 } 131 132 static inline int memblock_get_region_node(const struct memblock_region *r) 133 { 134 return r->nid; 135 } 136 #else 137 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 138 { 139 } 140 141 static inline int memblock_get_region_node(const struct memblock_region *r) 142 { 143 return 0; 144 } 145 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 146 147 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 148 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 149 150 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align); 151 152 #ifdef CONFIG_MOVABLE_NODE 153 /* 154 * Set the allocation direction to bottom-up or top-down. 155 */ 156 static inline void memblock_set_bottom_up(bool enable) 157 { 158 memblock.bottom_up = enable; 159 } 160 161 /* 162 * Check if the allocation direction is bottom-up or not. 163 * if this is true, that said, memblock will allocate memory 164 * in bottom-up direction. 165 */ 166 static inline bool memblock_bottom_up(void) 167 { 168 return memblock.bottom_up; 169 } 170 #else 171 static inline void memblock_set_bottom_up(bool enable) {} 172 static inline bool memblock_bottom_up(void) { return false; } 173 #endif 174 175 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */ 176 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 177 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 178 179 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 180 phys_addr_t max_addr); 181 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align, 182 phys_addr_t max_addr); 183 phys_addr_t memblock_phys_mem_size(void); 184 phys_addr_t memblock_mem_size(unsigned long limit_pfn); 185 phys_addr_t memblock_start_of_DRAM(void); 186 phys_addr_t memblock_end_of_DRAM(void); 187 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 188 int memblock_is_memory(phys_addr_t addr); 189 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 190 int memblock_is_reserved(phys_addr_t addr); 191 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 192 193 extern void __memblock_dump_all(void); 194 195 static inline void memblock_dump_all(void) 196 { 197 if (memblock_debug) 198 __memblock_dump_all(); 199 } 200 201 /** 202 * memblock_set_current_limit - Set the current allocation limit to allow 203 * limiting allocations to what is currently 204 * accessible during boot 205 * @limit: New limit value (physical address) 206 */ 207 void memblock_set_current_limit(phys_addr_t limit); 208 209 210 /* 211 * pfn conversion functions 212 * 213 * While the memory MEMBLOCKs should always be page aligned, the reserved 214 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 215 * idea of what they return for such non aligned MEMBLOCKs. 216 */ 217 218 /** 219 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region 220 * @reg: memblock_region structure 221 */ 222 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 223 { 224 return PFN_UP(reg->base); 225 } 226 227 /** 228 * memblock_region_memory_end_pfn - Return the end_pfn this region 229 * @reg: memblock_region structure 230 */ 231 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 232 { 233 return PFN_DOWN(reg->base + reg->size); 234 } 235 236 /** 237 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region 238 * @reg: memblock_region structure 239 */ 240 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 241 { 242 return PFN_DOWN(reg->base); 243 } 244 245 /** 246 * memblock_region_reserved_end_pfn - Return the end_pfn this region 247 * @reg: memblock_region structure 248 */ 249 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 250 { 251 return PFN_UP(reg->base + reg->size); 252 } 253 254 #define for_each_memblock(memblock_type, region) \ 255 for (region = memblock.memblock_type.regions; \ 256 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 257 region++) 258 259 260 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK 261 #define __init_memblock __meminit 262 #define __initdata_memblock __meminitdata 263 #else 264 #define __init_memblock 265 #define __initdata_memblock 266 #endif 267 268 #else 269 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align) 270 { 271 return 0; 272 } 273 274 #endif /* CONFIG_HAVE_MEMBLOCK */ 275 276 #endif /* __KERNEL__ */ 277 278 #endif /* _LINUX_MEMBLOCK_H */ 279