1 #ifndef _LINUX_MEMBLOCK_H 2 #define _LINUX_MEMBLOCK_H 3 #ifdef __KERNEL__ 4 5 /* 6 * Logical memory blocks. 7 * 8 * Copyright (C) 2001 Peter Bergner, IBM Corp. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 #include <linux/init.h> 17 #include <linux/mm.h> 18 #include <asm/dma.h> 19 20 extern unsigned long max_low_pfn; 21 extern unsigned long min_low_pfn; 22 23 /* 24 * highest page 25 */ 26 extern unsigned long max_pfn; 27 /* 28 * highest possible page 29 */ 30 extern unsigned long long max_possible_pfn; 31 32 /** 33 * enum memblock_flags - definition of memory region attributes 34 * @MEMBLOCK_NONE: no special request 35 * @MEMBLOCK_HOTPLUG: hotpluggable region 36 * @MEMBLOCK_MIRROR: mirrored region 37 * @MEMBLOCK_NOMAP: don't add to kernel direct mapping 38 */ 39 enum memblock_flags { 40 MEMBLOCK_NONE = 0x0, /* No special request */ 41 MEMBLOCK_HOTPLUG = 0x1, /* hotpluggable region */ 42 MEMBLOCK_MIRROR = 0x2, /* mirrored region */ 43 MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */ 44 }; 45 46 /** 47 * struct memblock_region - represents a memory region 48 * @base: physical address of the region 49 * @size: size of the region 50 * @flags: memory region attributes 51 * @nid: NUMA node id 52 */ 53 struct memblock_region { 54 phys_addr_t base; 55 phys_addr_t size; 56 enum memblock_flags flags; 57 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 58 int nid; 59 #endif 60 }; 61 62 /** 63 * struct memblock_type - collection of memory regions of certain type 64 * @cnt: number of regions 65 * @max: size of the allocated array 66 * @total_size: size of all regions 67 * @regions: array of regions 68 * @name: the memory type symbolic name 69 */ 70 struct memblock_type { 71 unsigned long cnt; 72 unsigned long max; 73 phys_addr_t total_size; 74 struct memblock_region *regions; 75 char *name; 76 }; 77 78 /** 79 * struct memblock - memblock allocator metadata 80 * @bottom_up: is bottom up direction? 81 * @current_limit: physical address of the current allocation limit 82 * @memory: usabe memory regions 83 * @reserved: reserved memory regions 84 * @physmem: all physical memory 85 */ 86 struct memblock { 87 bool bottom_up; /* is bottom up direction? */ 88 phys_addr_t current_limit; 89 struct memblock_type memory; 90 struct memblock_type reserved; 91 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP 92 struct memblock_type physmem; 93 #endif 94 }; 95 96 extern struct memblock memblock; 97 extern int memblock_debug; 98 99 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK 100 #define __init_memblock __meminit 101 #define __initdata_memblock __meminitdata 102 void memblock_discard(void); 103 #else 104 #define __init_memblock 105 #define __initdata_memblock 106 #endif 107 108 #define memblock_dbg(fmt, ...) \ 109 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 110 111 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, 112 phys_addr_t size, phys_addr_t align); 113 void memblock_allow_resize(void); 114 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); 115 int memblock_add(phys_addr_t base, phys_addr_t size); 116 int memblock_remove(phys_addr_t base, phys_addr_t size); 117 int memblock_free(phys_addr_t base, phys_addr_t size); 118 int memblock_reserve(phys_addr_t base, phys_addr_t size); 119 void memblock_trim_memory(phys_addr_t align); 120 bool memblock_overlaps_region(struct memblock_type *type, 121 phys_addr_t base, phys_addr_t size); 122 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); 123 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); 124 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); 125 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size); 126 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size); 127 128 unsigned long memblock_free_all(void); 129 void reset_node_managed_pages(pg_data_t *pgdat); 130 void reset_all_zones_managed_pages(void); 131 132 /* Low level functions */ 133 int memblock_add_range(struct memblock_type *type, 134 phys_addr_t base, phys_addr_t size, 135 int nid, enum memblock_flags flags); 136 137 void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags, 138 struct memblock_type *type_a, 139 struct memblock_type *type_b, phys_addr_t *out_start, 140 phys_addr_t *out_end, int *out_nid); 141 142 void __next_mem_range_rev(u64 *idx, int nid, enum memblock_flags flags, 143 struct memblock_type *type_a, 144 struct memblock_type *type_b, phys_addr_t *out_start, 145 phys_addr_t *out_end, int *out_nid); 146 147 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start, 148 phys_addr_t *out_end); 149 150 void __memblock_free_late(phys_addr_t base, phys_addr_t size); 151 152 /** 153 * for_each_mem_range - iterate through memblock areas from type_a and not 154 * included in type_b. Or just type_a if type_b is NULL. 155 * @i: u64 used as loop variable 156 * @type_a: ptr to memblock_type to iterate 157 * @type_b: ptr to memblock_type which excludes from the iteration 158 * @nid: node selector, %NUMA_NO_NODE for all nodes 159 * @flags: pick from blocks based on memory attributes 160 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 161 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 162 * @p_nid: ptr to int for nid of the range, can be %NULL 163 */ 164 #define for_each_mem_range(i, type_a, type_b, nid, flags, \ 165 p_start, p_end, p_nid) \ 166 for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \ 167 p_start, p_end, p_nid); \ 168 i != (u64)ULLONG_MAX; \ 169 __next_mem_range(&i, nid, flags, type_a, type_b, \ 170 p_start, p_end, p_nid)) 171 172 /** 173 * for_each_mem_range_rev - reverse iterate through memblock areas from 174 * type_a and not included in type_b. Or just type_a if type_b is NULL. 175 * @i: u64 used as loop variable 176 * @type_a: ptr to memblock_type to iterate 177 * @type_b: ptr to memblock_type which excludes from the iteration 178 * @nid: node selector, %NUMA_NO_NODE for all nodes 179 * @flags: pick from blocks based on memory attributes 180 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 181 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 182 * @p_nid: ptr to int for nid of the range, can be %NULL 183 */ 184 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags, \ 185 p_start, p_end, p_nid) \ 186 for (i = (u64)ULLONG_MAX, \ 187 __next_mem_range_rev(&i, nid, flags, type_a, type_b,\ 188 p_start, p_end, p_nid); \ 189 i != (u64)ULLONG_MAX; \ 190 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ 191 p_start, p_end, p_nid)) 192 193 /** 194 * for_each_reserved_mem_region - iterate over all reserved memblock areas 195 * @i: u64 used as loop variable 196 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 197 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 198 * 199 * Walks over reserved areas of memblock. Available as soon as memblock 200 * is initialized. 201 */ 202 #define for_each_reserved_mem_region(i, p_start, p_end) \ 203 for (i = 0UL, __next_reserved_mem_region(&i, p_start, p_end); \ 204 i != (u64)ULLONG_MAX; \ 205 __next_reserved_mem_region(&i, p_start, p_end)) 206 207 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 208 { 209 return m->flags & MEMBLOCK_HOTPLUG; 210 } 211 212 static inline bool memblock_is_mirror(struct memblock_region *m) 213 { 214 return m->flags & MEMBLOCK_MIRROR; 215 } 216 217 static inline bool memblock_is_nomap(struct memblock_region *m) 218 { 219 return m->flags & MEMBLOCK_NOMAP; 220 } 221 222 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 223 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 224 unsigned long *end_pfn); 225 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 226 unsigned long *out_end_pfn, int *out_nid); 227 228 /** 229 * for_each_mem_pfn_range - early memory pfn range iterator 230 * @i: an integer used as loop variable 231 * @nid: node selector, %MAX_NUMNODES for all nodes 232 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 233 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 234 * @p_nid: ptr to int for nid of the range, can be %NULL 235 * 236 * Walks over configured memory ranges. 237 */ 238 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 239 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 240 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 241 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 242 243 /** 244 * for_each_free_mem_range - iterate through free memblock areas 245 * @i: u64 used as loop variable 246 * @nid: node selector, %NUMA_NO_NODE for all nodes 247 * @flags: pick from blocks based on memory attributes 248 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 249 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 250 * @p_nid: ptr to int for nid of the range, can be %NULL 251 * 252 * Walks over free (memory && !reserved) areas of memblock. Available as 253 * soon as memblock is initialized. 254 */ 255 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ 256 for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ 257 nid, flags, p_start, p_end, p_nid) 258 259 /** 260 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 261 * @i: u64 used as loop variable 262 * @nid: node selector, %NUMA_NO_NODE for all nodes 263 * @flags: pick from blocks based on memory attributes 264 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 265 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 266 * @p_nid: ptr to int for nid of the range, can be %NULL 267 * 268 * Walks over free (memory && !reserved) areas of memblock in reverse 269 * order. Available as soon as memblock is initialized. 270 */ 271 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \ 272 p_nid) \ 273 for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \ 274 nid, flags, p_start, p_end, p_nid) 275 276 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 277 int memblock_set_node(phys_addr_t base, phys_addr_t size, 278 struct memblock_type *type, int nid); 279 280 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 281 { 282 r->nid = nid; 283 } 284 285 static inline int memblock_get_region_node(const struct memblock_region *r) 286 { 287 return r->nid; 288 } 289 #else 290 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 291 { 292 } 293 294 static inline int memblock_get_region_node(const struct memblock_region *r) 295 { 296 return 0; 297 } 298 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 299 300 /* Flags for memblock allocation APIs */ 301 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 302 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 303 #define MEMBLOCK_ALLOC_KASAN 1 304 305 /* We are using top down, so it is safe to use 0 here */ 306 #define MEMBLOCK_LOW_LIMIT 0 307 308 #ifndef ARCH_LOW_ADDRESS_LIMIT 309 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL 310 #endif 311 312 phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align, 313 phys_addr_t start, phys_addr_t end); 314 phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 315 316 static inline phys_addr_t memblock_phys_alloc(phys_addr_t size, 317 phys_addr_t align) 318 { 319 return memblock_phys_alloc_range(size, align, 0, 320 MEMBLOCK_ALLOC_ACCESSIBLE); 321 } 322 323 void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align, 324 phys_addr_t min_addr, phys_addr_t max_addr, 325 int nid); 326 void *memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, 327 phys_addr_t min_addr, phys_addr_t max_addr, 328 int nid); 329 330 static inline void * __init memblock_alloc(phys_addr_t size, phys_addr_t align) 331 { 332 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 333 MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE); 334 } 335 336 static inline void * __init memblock_alloc_raw(phys_addr_t size, 337 phys_addr_t align) 338 { 339 return memblock_alloc_try_nid_raw(size, align, MEMBLOCK_LOW_LIMIT, 340 MEMBLOCK_ALLOC_ACCESSIBLE, 341 NUMA_NO_NODE); 342 } 343 344 static inline void * __init memblock_alloc_from(phys_addr_t size, 345 phys_addr_t align, 346 phys_addr_t min_addr) 347 { 348 return memblock_alloc_try_nid(size, align, min_addr, 349 MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE); 350 } 351 352 static inline void * __init memblock_alloc_low(phys_addr_t size, 353 phys_addr_t align) 354 { 355 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 356 ARCH_LOW_ADDRESS_LIMIT, NUMA_NO_NODE); 357 } 358 359 static inline void * __init memblock_alloc_node(phys_addr_t size, 360 phys_addr_t align, int nid) 361 { 362 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 363 MEMBLOCK_ALLOC_ACCESSIBLE, nid); 364 } 365 366 static inline void __init memblock_free_early(phys_addr_t base, 367 phys_addr_t size) 368 { 369 memblock_free(base, size); 370 } 371 372 static inline void __init memblock_free_early_nid(phys_addr_t base, 373 phys_addr_t size, int nid) 374 { 375 memblock_free(base, size); 376 } 377 378 static inline void __init memblock_free_late(phys_addr_t base, phys_addr_t size) 379 { 380 __memblock_free_late(base, size); 381 } 382 383 /* 384 * Set the allocation direction to bottom-up or top-down. 385 */ 386 static inline void __init memblock_set_bottom_up(bool enable) 387 { 388 memblock.bottom_up = enable; 389 } 390 391 /* 392 * Check if the allocation direction is bottom-up or not. 393 * if this is true, that said, memblock will allocate memory 394 * in bottom-up direction. 395 */ 396 static inline bool memblock_bottom_up(void) 397 { 398 return memblock.bottom_up; 399 } 400 401 phys_addr_t memblock_phys_mem_size(void); 402 phys_addr_t memblock_reserved_size(void); 403 phys_addr_t memblock_mem_size(unsigned long limit_pfn); 404 phys_addr_t memblock_start_of_DRAM(void); 405 phys_addr_t memblock_end_of_DRAM(void); 406 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 407 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size); 408 void memblock_mem_limit_remove_map(phys_addr_t limit); 409 bool memblock_is_memory(phys_addr_t addr); 410 bool memblock_is_map_memory(phys_addr_t addr); 411 bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 412 bool memblock_is_reserved(phys_addr_t addr); 413 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 414 415 extern void __memblock_dump_all(void); 416 417 static inline void memblock_dump_all(void) 418 { 419 if (memblock_debug) 420 __memblock_dump_all(); 421 } 422 423 /** 424 * memblock_set_current_limit - Set the current allocation limit to allow 425 * limiting allocations to what is currently 426 * accessible during boot 427 * @limit: New limit value (physical address) 428 */ 429 void memblock_set_current_limit(phys_addr_t limit); 430 431 432 phys_addr_t memblock_get_current_limit(void); 433 434 /* 435 * pfn conversion functions 436 * 437 * While the memory MEMBLOCKs should always be page aligned, the reserved 438 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 439 * idea of what they return for such non aligned MEMBLOCKs. 440 */ 441 442 /** 443 * memblock_region_memory_base_pfn - get the lowest pfn of the memory region 444 * @reg: memblock_region structure 445 * 446 * Return: the lowest pfn intersecting with the memory region 447 */ 448 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 449 { 450 return PFN_UP(reg->base); 451 } 452 453 /** 454 * memblock_region_memory_end_pfn - get the end pfn of the memory region 455 * @reg: memblock_region structure 456 * 457 * Return: the end_pfn of the reserved region 458 */ 459 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 460 { 461 return PFN_DOWN(reg->base + reg->size); 462 } 463 464 /** 465 * memblock_region_reserved_base_pfn - get the lowest pfn of the reserved region 466 * @reg: memblock_region structure 467 * 468 * Return: the lowest pfn intersecting with the reserved region 469 */ 470 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 471 { 472 return PFN_DOWN(reg->base); 473 } 474 475 /** 476 * memblock_region_reserved_end_pfn - get the end pfn of the reserved region 477 * @reg: memblock_region structure 478 * 479 * Return: the end_pfn of the reserved region 480 */ 481 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 482 { 483 return PFN_UP(reg->base + reg->size); 484 } 485 486 #define for_each_memblock(memblock_type, region) \ 487 for (region = memblock.memblock_type.regions; \ 488 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 489 region++) 490 491 #define for_each_memblock_type(i, memblock_type, rgn) \ 492 for (i = 0, rgn = &memblock_type->regions[0]; \ 493 i < memblock_type->cnt; \ 494 i++, rgn = &memblock_type->regions[i]) 495 496 extern void *alloc_large_system_hash(const char *tablename, 497 unsigned long bucketsize, 498 unsigned long numentries, 499 int scale, 500 int flags, 501 unsigned int *_hash_shift, 502 unsigned int *_hash_mask, 503 unsigned long low_limit, 504 unsigned long high_limit); 505 506 #define HASH_EARLY 0x00000001 /* Allocating during early boot? */ 507 #define HASH_SMALL 0x00000002 /* sub-page allocation allowed, min 508 * shift passed via *_hash_shift */ 509 #define HASH_ZERO 0x00000004 /* Zero allocated hash table */ 510 511 /* Only NUMA needs hash distribution. 64bit NUMA architectures have 512 * sufficient vmalloc space. 513 */ 514 #ifdef CONFIG_NUMA 515 #define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT) 516 extern int hashdist; /* Distribute hashes across NUMA nodes? */ 517 #else 518 #define hashdist (0) 519 #endif 520 521 #ifdef CONFIG_MEMTEST 522 extern void early_memtest(phys_addr_t start, phys_addr_t end); 523 #else 524 static inline void early_memtest(phys_addr_t start, phys_addr_t end) 525 { 526 } 527 #endif 528 529 #endif /* __KERNEL__ */ 530 531 #endif /* _LINUX_MEMBLOCK_H */ 532