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 MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */ 29 }; 30 31 struct memblock_region { 32 phys_addr_t base; 33 phys_addr_t size; 34 unsigned long flags; 35 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 36 int nid; 37 #endif 38 }; 39 40 struct memblock_type { 41 unsigned long cnt; /* number of regions */ 42 unsigned long max; /* size of the allocated array */ 43 phys_addr_t total_size; /* size of all regions */ 44 struct memblock_region *regions; 45 }; 46 47 struct memblock { 48 bool bottom_up; /* is bottom up direction? */ 49 phys_addr_t current_limit; 50 struct memblock_type memory; 51 struct memblock_type reserved; 52 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP 53 struct memblock_type physmem; 54 #endif 55 }; 56 57 extern struct memblock memblock; 58 extern int memblock_debug; 59 #ifdef CONFIG_MOVABLE_NODE 60 /* If movable_node boot option specified */ 61 extern bool movable_node_enabled; 62 #endif /* CONFIG_MOVABLE_NODE */ 63 64 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK 65 #define __init_memblock __meminit 66 #define __initdata_memblock __meminitdata 67 #else 68 #define __init_memblock 69 #define __initdata_memblock 70 #endif 71 72 #define memblock_dbg(fmt, ...) \ 73 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 74 75 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align, 76 phys_addr_t start, phys_addr_t end, 77 int nid, ulong flags); 78 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, 79 phys_addr_t size, phys_addr_t align); 80 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr); 81 phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr); 82 void memblock_allow_resize(void); 83 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); 84 int memblock_add(phys_addr_t base, phys_addr_t size); 85 int memblock_remove(phys_addr_t base, phys_addr_t size); 86 int memblock_free(phys_addr_t base, phys_addr_t size); 87 int memblock_reserve(phys_addr_t base, phys_addr_t size); 88 void memblock_trim_memory(phys_addr_t align); 89 bool memblock_overlaps_region(struct memblock_type *type, 90 phys_addr_t base, phys_addr_t size); 91 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); 92 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); 93 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); 94 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size); 95 ulong choose_memblock_flags(void); 96 97 /* Low level functions */ 98 int memblock_add_range(struct memblock_type *type, 99 phys_addr_t base, phys_addr_t size, 100 int nid, unsigned long flags); 101 102 void __next_mem_range(u64 *idx, int nid, ulong flags, 103 struct memblock_type *type_a, 104 struct memblock_type *type_b, phys_addr_t *out_start, 105 phys_addr_t *out_end, int *out_nid); 106 107 void __next_mem_range_rev(u64 *idx, int nid, ulong flags, 108 struct memblock_type *type_a, 109 struct memblock_type *type_b, phys_addr_t *out_start, 110 phys_addr_t *out_end, int *out_nid); 111 112 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start, 113 phys_addr_t *out_end); 114 115 /** 116 * for_each_mem_range - iterate through memblock areas from type_a and not 117 * included in type_b. Or just type_a if type_b is NULL. 118 * @i: u64 used as loop variable 119 * @type_a: ptr to memblock_type to iterate 120 * @type_b: ptr to memblock_type which excludes from the iteration 121 * @nid: node selector, %NUMA_NO_NODE for all nodes 122 * @flags: pick from blocks based on memory attributes 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 #define for_each_mem_range(i, type_a, type_b, nid, flags, \ 128 p_start, p_end, p_nid) \ 129 for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \ 130 p_start, p_end, p_nid); \ 131 i != (u64)ULLONG_MAX; \ 132 __next_mem_range(&i, nid, flags, type_a, type_b, \ 133 p_start, p_end, p_nid)) 134 135 /** 136 * for_each_mem_range_rev - reverse iterate through memblock areas from 137 * type_a and not included in type_b. Or just type_a if type_b is NULL. 138 * @i: u64 used as loop variable 139 * @type_a: ptr to memblock_type to iterate 140 * @type_b: ptr to memblock_type which excludes from the iteration 141 * @nid: node selector, %NUMA_NO_NODE for all nodes 142 * @flags: pick from blocks based on memory attributes 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 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags, \ 148 p_start, p_end, p_nid) \ 149 for (i = (u64)ULLONG_MAX, \ 150 __next_mem_range_rev(&i, nid, flags, type_a, type_b,\ 151 p_start, p_end, p_nid); \ 152 i != (u64)ULLONG_MAX; \ 153 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ 154 p_start, p_end, p_nid)) 155 156 /** 157 * for_each_reserved_mem_region - iterate over all reserved memblock areas 158 * @i: u64 used as loop variable 159 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 160 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 161 * 162 * Walks over reserved areas of memblock. Available as soon as memblock 163 * is initialized. 164 */ 165 #define for_each_reserved_mem_region(i, p_start, p_end) \ 166 for (i = 0UL, __next_reserved_mem_region(&i, p_start, p_end); \ 167 i != (u64)ULLONG_MAX; \ 168 __next_reserved_mem_region(&i, p_start, p_end)) 169 170 #ifdef CONFIG_MOVABLE_NODE 171 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 172 { 173 return m->flags & MEMBLOCK_HOTPLUG; 174 } 175 176 static inline bool __init_memblock movable_node_is_enabled(void) 177 { 178 return movable_node_enabled; 179 } 180 #else 181 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 182 { 183 return false; 184 } 185 static inline bool movable_node_is_enabled(void) 186 { 187 return false; 188 } 189 #endif 190 191 static inline bool memblock_is_mirror(struct memblock_region *m) 192 { 193 return m->flags & MEMBLOCK_MIRROR; 194 } 195 196 static inline bool memblock_is_nomap(struct memblock_region *m) 197 { 198 return m->flags & MEMBLOCK_NOMAP; 199 } 200 201 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 202 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 203 unsigned long *end_pfn); 204 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 205 unsigned long *out_end_pfn, int *out_nid); 206 207 /** 208 * for_each_mem_pfn_range - early memory pfn range iterator 209 * @i: an integer used as loop variable 210 * @nid: node selector, %MAX_NUMNODES for all nodes 211 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 212 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 213 * @p_nid: ptr to int for nid of the range, can be %NULL 214 * 215 * Walks over configured memory ranges. 216 */ 217 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 218 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 219 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 220 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 221 222 /** 223 * for_each_free_mem_range - iterate through free memblock areas 224 * @i: u64 used as loop variable 225 * @nid: node selector, %NUMA_NO_NODE for all nodes 226 * @flags: pick from blocks based on memory attributes 227 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 228 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 229 * @p_nid: ptr to int for nid of the range, can be %NULL 230 * 231 * Walks over free (memory && !reserved) areas of memblock. Available as 232 * soon as memblock is initialized. 233 */ 234 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ 235 for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ 236 nid, flags, p_start, p_end, p_nid) 237 238 /** 239 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 240 * @i: u64 used as loop variable 241 * @nid: node selector, %NUMA_NO_NODE for all nodes 242 * @flags: pick from blocks based on memory attributes 243 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 244 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 245 * @p_nid: ptr to int for nid of the range, can be %NULL 246 * 247 * Walks over free (memory && !reserved) areas of memblock in reverse 248 * order. Available as soon as memblock is initialized. 249 */ 250 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \ 251 p_nid) \ 252 for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \ 253 nid, flags, p_start, p_end, p_nid) 254 255 static inline void memblock_set_region_flags(struct memblock_region *r, 256 unsigned long flags) 257 { 258 r->flags |= flags; 259 } 260 261 static inline void memblock_clear_region_flags(struct memblock_region *r, 262 unsigned long flags) 263 { 264 r->flags &= ~flags; 265 } 266 267 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 268 int memblock_set_node(phys_addr_t base, phys_addr_t size, 269 struct memblock_type *type, int nid); 270 271 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 272 { 273 r->nid = nid; 274 } 275 276 static inline int memblock_get_region_node(const struct memblock_region *r) 277 { 278 return r->nid; 279 } 280 #else 281 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 282 { 283 } 284 285 static inline int memblock_get_region_node(const struct memblock_region *r) 286 { 287 return 0; 288 } 289 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 290 291 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 292 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 293 294 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align); 295 296 #ifdef CONFIG_MOVABLE_NODE 297 /* 298 * Set the allocation direction to bottom-up or top-down. 299 */ 300 static inline void __init memblock_set_bottom_up(bool enable) 301 { 302 memblock.bottom_up = enable; 303 } 304 305 /* 306 * Check if the allocation direction is bottom-up or not. 307 * if this is true, that said, memblock will allocate memory 308 * in bottom-up direction. 309 */ 310 static inline bool memblock_bottom_up(void) 311 { 312 return memblock.bottom_up; 313 } 314 #else 315 static inline void __init memblock_set_bottom_up(bool enable) {} 316 static inline bool memblock_bottom_up(void) { return false; } 317 #endif 318 319 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */ 320 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 321 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 322 323 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align, 324 phys_addr_t start, phys_addr_t end, 325 ulong flags); 326 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 327 phys_addr_t max_addr); 328 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align, 329 phys_addr_t max_addr); 330 phys_addr_t memblock_phys_mem_size(void); 331 phys_addr_t memblock_reserved_size(void); 332 phys_addr_t memblock_mem_size(unsigned long limit_pfn); 333 phys_addr_t memblock_start_of_DRAM(void); 334 phys_addr_t memblock_end_of_DRAM(void); 335 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 336 void memblock_mem_limit_remove_map(phys_addr_t limit); 337 bool memblock_is_memory(phys_addr_t addr); 338 int memblock_is_map_memory(phys_addr_t addr); 339 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 340 bool memblock_is_reserved(phys_addr_t addr); 341 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 342 343 extern void __memblock_dump_all(void); 344 345 static inline void memblock_dump_all(void) 346 { 347 if (memblock_debug) 348 __memblock_dump_all(); 349 } 350 351 /** 352 * memblock_set_current_limit - Set the current allocation limit to allow 353 * limiting allocations to what is currently 354 * accessible during boot 355 * @limit: New limit value (physical address) 356 */ 357 void memblock_set_current_limit(phys_addr_t limit); 358 359 360 phys_addr_t memblock_get_current_limit(void); 361 362 /* 363 * pfn conversion functions 364 * 365 * While the memory MEMBLOCKs should always be page aligned, the reserved 366 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 367 * idea of what they return for such non aligned MEMBLOCKs. 368 */ 369 370 /** 371 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region 372 * @reg: memblock_region structure 373 */ 374 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 375 { 376 return PFN_UP(reg->base); 377 } 378 379 /** 380 * memblock_region_memory_end_pfn - Return the end_pfn this region 381 * @reg: memblock_region structure 382 */ 383 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 384 { 385 return PFN_DOWN(reg->base + reg->size); 386 } 387 388 /** 389 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region 390 * @reg: memblock_region structure 391 */ 392 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 393 { 394 return PFN_DOWN(reg->base); 395 } 396 397 /** 398 * memblock_region_reserved_end_pfn - Return the end_pfn this region 399 * @reg: memblock_region structure 400 */ 401 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 402 { 403 return PFN_UP(reg->base + reg->size); 404 } 405 406 #define for_each_memblock(memblock_type, region) \ 407 for (region = memblock.memblock_type.regions; \ 408 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 409 region++) 410 411 #define for_each_memblock_type(memblock_type, rgn) \ 412 for (idx = 0, rgn = &memblock_type->regions[0]; \ 413 idx < memblock_type->cnt; \ 414 idx++, rgn = &memblock_type->regions[idx]) 415 416 #ifdef CONFIG_MEMTEST 417 extern void early_memtest(phys_addr_t start, phys_addr_t end); 418 #else 419 static inline void early_memtest(phys_addr_t start, phys_addr_t end) 420 { 421 } 422 #endif 423 424 #else 425 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align) 426 { 427 return 0; 428 } 429 430 #endif /* CONFIG_HAVE_MEMBLOCK */ 431 432 #endif /* __KERNEL__ */ 433 434 #endif /* _LINUX_MEMBLOCK_H */ 435