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 /* Definition of memblock flags. */ 23 #define MEMBLOCK_HOTPLUG 0x1 /* hotpluggable region */ 24 25 struct memblock_region { 26 phys_addr_t base; 27 phys_addr_t size; 28 unsigned long flags; 29 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 30 int nid; 31 #endif 32 }; 33 34 struct memblock_type { 35 unsigned long cnt; /* number of regions */ 36 unsigned long max; /* size of the allocated array */ 37 phys_addr_t total_size; /* size of all regions */ 38 struct memblock_region *regions; 39 }; 40 41 struct memblock { 42 bool bottom_up; /* is bottom up direction? */ 43 phys_addr_t current_limit; 44 struct memblock_type memory; 45 struct memblock_type reserved; 46 }; 47 48 extern struct memblock memblock; 49 extern int memblock_debug; 50 #ifdef CONFIG_MOVABLE_NODE 51 /* If movable_node boot option specified */ 52 extern bool movable_node_enabled; 53 #endif /* CONFIG_MOVABLE_NODE */ 54 55 #define memblock_dbg(fmt, ...) \ 56 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 57 58 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align, 59 phys_addr_t start, phys_addr_t end, 60 int nid); 61 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, 62 phys_addr_t size, phys_addr_t align); 63 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr); 64 phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr); 65 void memblock_allow_resize(void); 66 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); 67 int memblock_add(phys_addr_t base, phys_addr_t size); 68 int memblock_remove(phys_addr_t base, phys_addr_t size); 69 int memblock_free(phys_addr_t base, phys_addr_t size); 70 int memblock_reserve(phys_addr_t base, phys_addr_t size); 71 void memblock_trim_memory(phys_addr_t align); 72 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); 73 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); 74 #ifdef CONFIG_MOVABLE_NODE 75 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 76 { 77 return m->flags & MEMBLOCK_HOTPLUG; 78 } 79 80 static inline bool movable_node_is_enabled(void) 81 { 82 return movable_node_enabled; 83 } 84 #else 85 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 86 { 87 return false; 88 } 89 static inline bool movable_node_is_enabled(void) 90 { 91 return false; 92 } 93 #endif 94 95 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 96 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 97 unsigned long *end_pfn); 98 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 99 unsigned long *out_end_pfn, int *out_nid); 100 101 /** 102 * for_each_mem_pfn_range - early memory pfn range iterator 103 * @i: an integer used as loop variable 104 * @nid: node selector, %MAX_NUMNODES for all nodes 105 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 106 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 107 * @p_nid: ptr to int for nid of the range, can be %NULL 108 * 109 * Walks over configured memory ranges. 110 */ 111 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 112 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 113 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 114 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 115 116 void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start, 117 phys_addr_t *out_end, int *out_nid); 118 119 /** 120 * for_each_free_mem_range - iterate through free memblock areas 121 * @i: u64 used as loop variable 122 * @nid: node selector, %NUMA_NO_NODE for all nodes 123 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 124 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 125 * @p_nid: ptr to int for nid of the range, can be %NULL 126 * 127 * Walks over free (memory && !reserved) areas of memblock. Available as 128 * soon as memblock is initialized. 129 */ 130 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid) \ 131 for (i = 0, \ 132 __next_free_mem_range(&i, nid, p_start, p_end, p_nid); \ 133 i != (u64)ULLONG_MAX; \ 134 __next_free_mem_range(&i, nid, p_start, p_end, p_nid)) 135 136 void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start, 137 phys_addr_t *out_end, int *out_nid); 138 139 /** 140 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 141 * @i: u64 used as loop variable 142 * @nid: node selector, %NUMA_NO_NODE for all nodes 143 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 144 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 145 * @p_nid: ptr to int for nid of the range, can be %NULL 146 * 147 * Walks over free (memory && !reserved) areas of memblock in reverse 148 * order. Available as soon as memblock is initialized. 149 */ 150 #define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid) \ 151 for (i = (u64)ULLONG_MAX, \ 152 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid); \ 153 i != (u64)ULLONG_MAX; \ 154 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid)) 155 156 static inline void memblock_set_region_flags(struct memblock_region *r, 157 unsigned long flags) 158 { 159 r->flags |= flags; 160 } 161 162 static inline void memblock_clear_region_flags(struct memblock_region *r, 163 unsigned long flags) 164 { 165 r->flags &= ~flags; 166 } 167 168 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 169 int memblock_set_node(phys_addr_t base, phys_addr_t size, 170 struct memblock_type *type, int nid); 171 172 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 173 { 174 r->nid = nid; 175 } 176 177 static inline int memblock_get_region_node(const struct memblock_region *r) 178 { 179 return r->nid; 180 } 181 #else 182 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 183 { 184 } 185 186 static inline int memblock_get_region_node(const struct memblock_region *r) 187 { 188 return 0; 189 } 190 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 191 192 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 193 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 194 195 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align); 196 197 #ifdef CONFIG_MOVABLE_NODE 198 /* 199 * Set the allocation direction to bottom-up or top-down. 200 */ 201 static inline void memblock_set_bottom_up(bool enable) 202 { 203 memblock.bottom_up = enable; 204 } 205 206 /* 207 * Check if the allocation direction is bottom-up or not. 208 * if this is true, that said, memblock will allocate memory 209 * in bottom-up direction. 210 */ 211 static inline bool memblock_bottom_up(void) 212 { 213 return memblock.bottom_up; 214 } 215 #else 216 static inline void memblock_set_bottom_up(bool enable) {} 217 static inline bool memblock_bottom_up(void) { return false; } 218 #endif 219 220 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */ 221 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 222 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 223 224 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 225 phys_addr_t max_addr); 226 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align, 227 phys_addr_t max_addr); 228 phys_addr_t memblock_phys_mem_size(void); 229 phys_addr_t memblock_mem_size(unsigned long limit_pfn); 230 phys_addr_t memblock_start_of_DRAM(void); 231 phys_addr_t memblock_end_of_DRAM(void); 232 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 233 int memblock_is_memory(phys_addr_t addr); 234 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 235 int memblock_is_reserved(phys_addr_t addr); 236 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 237 238 extern void __memblock_dump_all(void); 239 240 static inline void memblock_dump_all(void) 241 { 242 if (memblock_debug) 243 __memblock_dump_all(); 244 } 245 246 /** 247 * memblock_set_current_limit - Set the current allocation limit to allow 248 * limiting allocations to what is currently 249 * accessible during boot 250 * @limit: New limit value (physical address) 251 */ 252 void memblock_set_current_limit(phys_addr_t limit); 253 254 255 phys_addr_t memblock_get_current_limit(void); 256 257 /* 258 * pfn conversion functions 259 * 260 * While the memory MEMBLOCKs should always be page aligned, the reserved 261 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 262 * idea of what they return for such non aligned MEMBLOCKs. 263 */ 264 265 /** 266 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region 267 * @reg: memblock_region structure 268 */ 269 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 270 { 271 return PFN_UP(reg->base); 272 } 273 274 /** 275 * memblock_region_memory_end_pfn - Return the end_pfn this region 276 * @reg: memblock_region structure 277 */ 278 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 279 { 280 return PFN_DOWN(reg->base + reg->size); 281 } 282 283 /** 284 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region 285 * @reg: memblock_region structure 286 */ 287 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 288 { 289 return PFN_DOWN(reg->base); 290 } 291 292 /** 293 * memblock_region_reserved_end_pfn - Return the end_pfn this region 294 * @reg: memblock_region structure 295 */ 296 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 297 { 298 return PFN_UP(reg->base + reg->size); 299 } 300 301 #define for_each_memblock(memblock_type, region) \ 302 for (region = memblock.memblock_type.regions; \ 303 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 304 region++) 305 306 307 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK 308 #define __init_memblock __meminit 309 #define __initdata_memblock __meminitdata 310 #else 311 #define __init_memblock 312 #define __initdata_memblock 313 #endif 314 315 #else 316 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align) 317 { 318 return 0; 319 } 320 321 #endif /* CONFIG_HAVE_MEMBLOCK */ 322 323 #endif /* __KERNEL__ */ 324 325 #endif /* _LINUX_MEMBLOCK_H */ 326