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 #define INIT_PHYSMEM_REGIONS 4 22 23 /* Definition of memblock flags. */ 24 enum { 25 MEMBLOCK_NONE = 0x0, /* No special request */ 26 MEMBLOCK_HOTPLUG = 0x1, /* hotpluggable region */ 27 MEMBLOCK_MIRROR = 0x2, /* mirrored region */ 28 }; 29 30 struct memblock_region { 31 phys_addr_t base; 32 phys_addr_t size; 33 unsigned long flags; 34 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 35 int nid; 36 #endif 37 }; 38 39 struct memblock_type { 40 unsigned long cnt; /* number of regions */ 41 unsigned long max; /* size of the allocated array */ 42 phys_addr_t total_size; /* size of all regions */ 43 struct memblock_region *regions; 44 }; 45 46 struct memblock { 47 bool bottom_up; /* is bottom up direction? */ 48 phys_addr_t current_limit; 49 struct memblock_type memory; 50 struct memblock_type reserved; 51 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP 52 struct memblock_type physmem; 53 #endif 54 }; 55 56 extern struct memblock memblock; 57 extern int memblock_debug; 58 #ifdef CONFIG_MOVABLE_NODE 59 /* If movable_node boot option specified */ 60 extern bool movable_node_enabled; 61 #endif /* CONFIG_MOVABLE_NODE */ 62 63 #define memblock_dbg(fmt, ...) \ 64 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 65 66 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align, 67 phys_addr_t start, phys_addr_t end, 68 int nid, ulong flags); 69 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, 70 phys_addr_t size, phys_addr_t align); 71 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr); 72 phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr); 73 void memblock_allow_resize(void); 74 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); 75 int memblock_add(phys_addr_t base, phys_addr_t size); 76 int memblock_remove(phys_addr_t base, phys_addr_t size); 77 int memblock_free(phys_addr_t base, phys_addr_t size); 78 int memblock_reserve(phys_addr_t base, phys_addr_t size); 79 void memblock_trim_memory(phys_addr_t align); 80 bool memblock_overlaps_region(struct memblock_type *type, 81 phys_addr_t base, phys_addr_t size); 82 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); 83 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); 84 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); 85 ulong choose_memblock_flags(void); 86 87 /* Low level functions */ 88 int memblock_add_range(struct memblock_type *type, 89 phys_addr_t base, phys_addr_t size, 90 int nid, unsigned long flags); 91 92 void __next_mem_range(u64 *idx, int nid, ulong flags, 93 struct memblock_type *type_a, 94 struct memblock_type *type_b, phys_addr_t *out_start, 95 phys_addr_t *out_end, int *out_nid); 96 97 void __next_mem_range_rev(u64 *idx, int nid, ulong flags, 98 struct memblock_type *type_a, 99 struct memblock_type *type_b, phys_addr_t *out_start, 100 phys_addr_t *out_end, int *out_nid); 101 102 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start, 103 phys_addr_t *out_end); 104 105 /** 106 * for_each_mem_range - iterate through memblock areas from type_a and not 107 * included in type_b. Or just type_a if type_b is NULL. 108 * @i: u64 used as loop variable 109 * @type_a: ptr to memblock_type to iterate 110 * @type_b: ptr to memblock_type which excludes from the iteration 111 * @nid: node selector, %NUMA_NO_NODE for all nodes 112 * @flags: pick from blocks based on memory attributes 113 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 114 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 115 * @p_nid: ptr to int for nid of the range, can be %NULL 116 */ 117 #define for_each_mem_range(i, type_a, type_b, nid, flags, \ 118 p_start, p_end, p_nid) \ 119 for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \ 120 p_start, p_end, p_nid); \ 121 i != (u64)ULLONG_MAX; \ 122 __next_mem_range(&i, nid, flags, type_a, type_b, \ 123 p_start, p_end, p_nid)) 124 125 /** 126 * for_each_mem_range_rev - reverse iterate through memblock areas from 127 * type_a and not included in type_b. Or just type_a if type_b is NULL. 128 * @i: u64 used as loop variable 129 * @type_a: ptr to memblock_type to iterate 130 * @type_b: ptr to memblock_type which excludes from the iteration 131 * @nid: node selector, %NUMA_NO_NODE for all nodes 132 * @flags: pick from blocks based on memory attributes 133 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 134 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 135 * @p_nid: ptr to int for nid of the range, can be %NULL 136 */ 137 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags, \ 138 p_start, p_end, p_nid) \ 139 for (i = (u64)ULLONG_MAX, \ 140 __next_mem_range_rev(&i, nid, flags, type_a, type_b,\ 141 p_start, p_end, p_nid); \ 142 i != (u64)ULLONG_MAX; \ 143 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ 144 p_start, p_end, p_nid)) 145 146 /** 147 * for_each_reserved_mem_region - iterate over all reserved memblock areas 148 * @i: u64 used as loop variable 149 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 150 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 151 * 152 * Walks over reserved areas of memblock. Available as soon as memblock 153 * is initialized. 154 */ 155 #define for_each_reserved_mem_region(i, p_start, p_end) \ 156 for (i = 0UL, \ 157 __next_reserved_mem_region(&i, p_start, p_end); \ 158 i != (u64)ULLONG_MAX; \ 159 __next_reserved_mem_region(&i, p_start, p_end)) 160 161 #ifdef CONFIG_MOVABLE_NODE 162 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 163 { 164 return m->flags & MEMBLOCK_HOTPLUG; 165 } 166 167 static inline bool movable_node_is_enabled(void) 168 { 169 return movable_node_enabled; 170 } 171 #else 172 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 173 { 174 return false; 175 } 176 static inline bool movable_node_is_enabled(void) 177 { 178 return false; 179 } 180 #endif 181 182 static inline bool memblock_is_mirror(struct memblock_region *m) 183 { 184 return m->flags & MEMBLOCK_MIRROR; 185 } 186 187 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 188 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 189 unsigned long *end_pfn); 190 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 191 unsigned long *out_end_pfn, int *out_nid); 192 193 /** 194 * for_each_mem_pfn_range - early memory pfn range iterator 195 * @i: an integer used as loop variable 196 * @nid: node selector, %MAX_NUMNODES for all nodes 197 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 198 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 199 * @p_nid: ptr to int for nid of the range, can be %NULL 200 * 201 * Walks over configured memory ranges. 202 */ 203 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 204 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 205 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 206 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 207 208 /** 209 * for_each_free_mem_range - iterate through free memblock areas 210 * @i: u64 used as loop variable 211 * @nid: node selector, %NUMA_NO_NODE for all nodes 212 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 213 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 214 * @p_nid: ptr to int for nid of the range, can be %NULL 215 * @flags: pick from blocks based on memory attributes 216 * 217 * Walks over free (memory && !reserved) areas of memblock. Available as 218 * soon as memblock is initialized. 219 */ 220 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ 221 for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ 222 nid, flags, p_start, p_end, p_nid) 223 224 /** 225 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 226 * @i: u64 used as loop variable 227 * @nid: node selector, %NUMA_NO_NODE for all nodes 228 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 229 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 230 * @p_nid: ptr to int for nid of the range, can be %NULL 231 * @flags: pick from blocks based on memory attributes 232 * 233 * Walks over free (memory && !reserved) areas of memblock in reverse 234 * order. Available as soon as memblock is initialized. 235 */ 236 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \ 237 p_nid) \ 238 for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \ 239 nid, flags, p_start, p_end, p_nid) 240 241 static inline void memblock_set_region_flags(struct memblock_region *r, 242 unsigned long flags) 243 { 244 r->flags |= flags; 245 } 246 247 static inline void memblock_clear_region_flags(struct memblock_region *r, 248 unsigned long flags) 249 { 250 r->flags &= ~flags; 251 } 252 253 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 254 int memblock_set_node(phys_addr_t base, phys_addr_t size, 255 struct memblock_type *type, int nid); 256 257 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 258 { 259 r->nid = nid; 260 } 261 262 static inline int memblock_get_region_node(const struct memblock_region *r) 263 { 264 return r->nid; 265 } 266 #else 267 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 268 { 269 } 270 271 static inline int memblock_get_region_node(const struct memblock_region *r) 272 { 273 return 0; 274 } 275 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 276 277 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 278 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 279 280 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align); 281 282 #ifdef CONFIG_MOVABLE_NODE 283 /* 284 * Set the allocation direction to bottom-up or top-down. 285 */ 286 static inline void __init memblock_set_bottom_up(bool enable) 287 { 288 memblock.bottom_up = enable; 289 } 290 291 /* 292 * Check if the allocation direction is bottom-up or not. 293 * if this is true, that said, memblock will allocate memory 294 * in bottom-up direction. 295 */ 296 static inline bool memblock_bottom_up(void) 297 { 298 return memblock.bottom_up; 299 } 300 #else 301 static inline void __init memblock_set_bottom_up(bool enable) {} 302 static inline bool memblock_bottom_up(void) { return false; } 303 #endif 304 305 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */ 306 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 307 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 308 309 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align, 310 phys_addr_t start, phys_addr_t end, 311 ulong flags); 312 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 313 phys_addr_t max_addr); 314 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align, 315 phys_addr_t max_addr); 316 phys_addr_t memblock_phys_mem_size(void); 317 phys_addr_t memblock_mem_size(unsigned long limit_pfn); 318 phys_addr_t memblock_start_of_DRAM(void); 319 phys_addr_t memblock_end_of_DRAM(void); 320 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 321 int memblock_is_memory(phys_addr_t addr); 322 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 323 int memblock_is_reserved(phys_addr_t addr); 324 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 325 326 extern void __memblock_dump_all(void); 327 328 static inline void memblock_dump_all(void) 329 { 330 if (memblock_debug) 331 __memblock_dump_all(); 332 } 333 334 /** 335 * memblock_set_current_limit - Set the current allocation limit to allow 336 * limiting allocations to what is currently 337 * accessible during boot 338 * @limit: New limit value (physical address) 339 */ 340 void memblock_set_current_limit(phys_addr_t limit); 341 342 343 phys_addr_t memblock_get_current_limit(void); 344 345 /* 346 * pfn conversion functions 347 * 348 * While the memory MEMBLOCKs should always be page aligned, the reserved 349 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 350 * idea of what they return for such non aligned MEMBLOCKs. 351 */ 352 353 /** 354 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region 355 * @reg: memblock_region structure 356 */ 357 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 358 { 359 return PFN_UP(reg->base); 360 } 361 362 /** 363 * memblock_region_memory_end_pfn - Return the end_pfn this region 364 * @reg: memblock_region structure 365 */ 366 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 367 { 368 return PFN_DOWN(reg->base + reg->size); 369 } 370 371 /** 372 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region 373 * @reg: memblock_region structure 374 */ 375 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 376 { 377 return PFN_DOWN(reg->base); 378 } 379 380 /** 381 * memblock_region_reserved_end_pfn - Return the end_pfn this region 382 * @reg: memblock_region structure 383 */ 384 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 385 { 386 return PFN_UP(reg->base + reg->size); 387 } 388 389 #define for_each_memblock(memblock_type, region) \ 390 for (region = memblock.memblock_type.regions; \ 391 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 392 region++) 393 394 395 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK 396 #define __init_memblock __meminit 397 #define __initdata_memblock __meminitdata 398 #else 399 #define __init_memblock 400 #define __initdata_memblock 401 #endif 402 403 #ifdef CONFIG_MEMTEST 404 extern void early_memtest(phys_addr_t start, phys_addr_t end); 405 #else 406 static inline void early_memtest(phys_addr_t start, phys_addr_t end) 407 { 408 } 409 #endif 410 411 #else 412 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align) 413 { 414 return 0; 415 } 416 417 #endif /* CONFIG_HAVE_MEMBLOCK */ 418 419 #endif /* __KERNEL__ */ 420 421 #endif /* _LINUX_MEMBLOCK_H */ 422