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 #define INIT_MEMBLOCK_REGIONS 128 33 #define INIT_PHYSMEM_REGIONS 4 34 35 /** 36 * enum memblock_flags - definition of memory region attributes 37 * @MEMBLOCK_NONE: no special request 38 * @MEMBLOCK_HOTPLUG: hotpluggable region 39 * @MEMBLOCK_MIRROR: mirrored region 40 * @MEMBLOCK_NOMAP: don't add to kernel direct mapping 41 */ 42 enum memblock_flags { 43 MEMBLOCK_NONE = 0x0, /* No special request */ 44 MEMBLOCK_HOTPLUG = 0x1, /* hotpluggable region */ 45 MEMBLOCK_MIRROR = 0x2, /* mirrored region */ 46 MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */ 47 }; 48 49 /** 50 * struct memblock_region - represents a memory region 51 * @base: physical address of the region 52 * @size: size of the region 53 * @flags: memory region attributes 54 * @nid: NUMA node id 55 */ 56 struct memblock_region { 57 phys_addr_t base; 58 phys_addr_t size; 59 enum memblock_flags flags; 60 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 61 int nid; 62 #endif 63 }; 64 65 /** 66 * struct memblock_type - collection of memory regions of certain type 67 * @cnt: number of regions 68 * @max: size of the allocated array 69 * @total_size: size of all regions 70 * @regions: array of regions 71 * @name: the memory type symbolic name 72 */ 73 struct memblock_type { 74 unsigned long cnt; 75 unsigned long max; 76 phys_addr_t total_size; 77 struct memblock_region *regions; 78 char *name; 79 }; 80 81 /** 82 * struct memblock - memblock allocator metadata 83 * @bottom_up: is bottom up direction? 84 * @current_limit: physical address of the current allocation limit 85 * @memory: usabe memory regions 86 * @reserved: reserved memory regions 87 * @physmem: all physical memory 88 */ 89 struct memblock { 90 bool bottom_up; /* is bottom up direction? */ 91 phys_addr_t current_limit; 92 struct memblock_type memory; 93 struct memblock_type reserved; 94 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP 95 struct memblock_type physmem; 96 #endif 97 }; 98 99 extern struct memblock memblock; 100 extern int memblock_debug; 101 102 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK 103 #define __init_memblock __meminit 104 #define __initdata_memblock __meminitdata 105 void memblock_discard(void); 106 #else 107 #define __init_memblock 108 #define __initdata_memblock 109 #endif 110 111 #define memblock_dbg(fmt, ...) \ 112 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 113 114 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align, 115 phys_addr_t start, phys_addr_t end, 116 int nid, enum memblock_flags flags); 117 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, 118 phys_addr_t size, phys_addr_t align); 119 void memblock_allow_resize(void); 120 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); 121 int memblock_add(phys_addr_t base, phys_addr_t size); 122 int memblock_remove(phys_addr_t base, phys_addr_t size); 123 int memblock_free(phys_addr_t base, phys_addr_t size); 124 int memblock_reserve(phys_addr_t base, phys_addr_t size); 125 void memblock_trim_memory(phys_addr_t align); 126 bool memblock_overlaps_region(struct memblock_type *type, 127 phys_addr_t base, phys_addr_t size); 128 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); 129 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); 130 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); 131 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size); 132 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size); 133 enum memblock_flags choose_memblock_flags(void); 134 135 unsigned long memblock_free_all(void); 136 void reset_node_managed_pages(pg_data_t *pgdat); 137 void reset_all_zones_managed_pages(void); 138 139 /* Low level functions */ 140 int memblock_add_range(struct memblock_type *type, 141 phys_addr_t base, phys_addr_t size, 142 int nid, enum memblock_flags flags); 143 144 void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags, 145 struct memblock_type *type_a, 146 struct memblock_type *type_b, phys_addr_t *out_start, 147 phys_addr_t *out_end, int *out_nid); 148 149 void __next_mem_range_rev(u64 *idx, int nid, enum memblock_flags flags, 150 struct memblock_type *type_a, 151 struct memblock_type *type_b, phys_addr_t *out_start, 152 phys_addr_t *out_end, int *out_nid); 153 154 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start, 155 phys_addr_t *out_end); 156 157 void __memblock_free_late(phys_addr_t base, phys_addr_t size); 158 159 /** 160 * for_each_mem_range - iterate through memblock areas from type_a and not 161 * included in type_b. Or just type_a if type_b is NULL. 162 * @i: u64 used as loop variable 163 * @type_a: ptr to memblock_type to iterate 164 * @type_b: ptr to memblock_type which excludes from the iteration 165 * @nid: node selector, %NUMA_NO_NODE for all nodes 166 * @flags: pick from blocks based on memory attributes 167 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 168 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 169 * @p_nid: ptr to int for nid of the range, can be %NULL 170 */ 171 #define for_each_mem_range(i, type_a, type_b, nid, flags, \ 172 p_start, p_end, p_nid) \ 173 for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \ 174 p_start, p_end, p_nid); \ 175 i != (u64)ULLONG_MAX; \ 176 __next_mem_range(&i, nid, flags, type_a, type_b, \ 177 p_start, p_end, p_nid)) 178 179 /** 180 * for_each_mem_range_rev - reverse iterate through memblock areas from 181 * type_a and not included in type_b. Or just type_a if type_b is NULL. 182 * @i: u64 used as loop variable 183 * @type_a: ptr to memblock_type to iterate 184 * @type_b: ptr to memblock_type which excludes from the iteration 185 * @nid: node selector, %NUMA_NO_NODE for all nodes 186 * @flags: pick from blocks based on memory attributes 187 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 188 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 189 * @p_nid: ptr to int for nid of the range, can be %NULL 190 */ 191 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags, \ 192 p_start, p_end, p_nid) \ 193 for (i = (u64)ULLONG_MAX, \ 194 __next_mem_range_rev(&i, nid, flags, type_a, type_b,\ 195 p_start, p_end, p_nid); \ 196 i != (u64)ULLONG_MAX; \ 197 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ 198 p_start, p_end, p_nid)) 199 200 /** 201 * for_each_reserved_mem_region - iterate over all reserved memblock areas 202 * @i: u64 used as loop variable 203 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 204 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 205 * 206 * Walks over reserved areas of memblock. Available as soon as memblock 207 * is initialized. 208 */ 209 #define for_each_reserved_mem_region(i, p_start, p_end) \ 210 for (i = 0UL, __next_reserved_mem_region(&i, p_start, p_end); \ 211 i != (u64)ULLONG_MAX; \ 212 __next_reserved_mem_region(&i, p_start, p_end)) 213 214 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 215 { 216 return m->flags & MEMBLOCK_HOTPLUG; 217 } 218 219 static inline bool memblock_is_mirror(struct memblock_region *m) 220 { 221 return m->flags & MEMBLOCK_MIRROR; 222 } 223 224 static inline bool memblock_is_nomap(struct memblock_region *m) 225 { 226 return m->flags & MEMBLOCK_NOMAP; 227 } 228 229 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 230 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 231 unsigned long *end_pfn); 232 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 233 unsigned long *out_end_pfn, int *out_nid); 234 235 /** 236 * for_each_mem_pfn_range - early memory pfn range iterator 237 * @i: an integer used as loop variable 238 * @nid: node selector, %MAX_NUMNODES for all nodes 239 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 240 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 241 * @p_nid: ptr to int for nid of the range, can be %NULL 242 * 243 * Walks over configured memory ranges. 244 */ 245 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 246 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 247 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 248 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 249 250 /** 251 * for_each_free_mem_range - iterate through free memblock areas 252 * @i: u64 used as loop variable 253 * @nid: node selector, %NUMA_NO_NODE for all nodes 254 * @flags: pick from blocks based on memory attributes 255 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 256 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 257 * @p_nid: ptr to int for nid of the range, can be %NULL 258 * 259 * Walks over free (memory && !reserved) areas of memblock. Available as 260 * soon as memblock is initialized. 261 */ 262 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ 263 for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ 264 nid, flags, p_start, p_end, p_nid) 265 266 /** 267 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 268 * @i: u64 used as loop variable 269 * @nid: node selector, %NUMA_NO_NODE for all nodes 270 * @flags: pick from blocks based on memory attributes 271 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 272 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 273 * @p_nid: ptr to int for nid of the range, can be %NULL 274 * 275 * Walks over free (memory && !reserved) areas of memblock in reverse 276 * order. Available as soon as memblock is initialized. 277 */ 278 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \ 279 p_nid) \ 280 for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \ 281 nid, flags, p_start, p_end, p_nid) 282 283 static inline void memblock_set_region_flags(struct memblock_region *r, 284 enum memblock_flags flags) 285 { 286 r->flags |= flags; 287 } 288 289 static inline void memblock_clear_region_flags(struct memblock_region *r, 290 enum memblock_flags flags) 291 { 292 r->flags &= ~flags; 293 } 294 295 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 296 int memblock_set_node(phys_addr_t base, phys_addr_t size, 297 struct memblock_type *type, int nid); 298 299 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 300 { 301 r->nid = nid; 302 } 303 304 static inline int memblock_get_region_node(const struct memblock_region *r) 305 { 306 return r->nid; 307 } 308 #else 309 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 310 { 311 } 312 313 static inline int memblock_get_region_node(const struct memblock_region *r) 314 { 315 return 0; 316 } 317 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 318 319 /* Flags for memblock allocation APIs */ 320 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 321 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 322 #define MEMBLOCK_ALLOC_KASAN 1 323 324 /* We are using top down, so it is safe to use 0 here */ 325 #define MEMBLOCK_LOW_LIMIT 0 326 327 #ifndef ARCH_LOW_ADDRESS_LIMIT 328 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL 329 #endif 330 331 phys_addr_t memblock_phys_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 332 phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 333 334 phys_addr_t memblock_phys_alloc(phys_addr_t size, phys_addr_t align); 335 336 void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align, 337 phys_addr_t min_addr, phys_addr_t max_addr, 338 int nid); 339 void *memblock_alloc_try_nid_nopanic(phys_addr_t size, phys_addr_t align, 340 phys_addr_t min_addr, phys_addr_t max_addr, 341 int nid); 342 void *memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, 343 phys_addr_t min_addr, phys_addr_t max_addr, 344 int nid); 345 346 static inline void * __init memblock_alloc(phys_addr_t size, phys_addr_t align) 347 { 348 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 349 MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE); 350 } 351 352 static inline void * __init memblock_alloc_raw(phys_addr_t size, 353 phys_addr_t align) 354 { 355 return memblock_alloc_try_nid_raw(size, align, MEMBLOCK_LOW_LIMIT, 356 MEMBLOCK_ALLOC_ACCESSIBLE, 357 NUMA_NO_NODE); 358 } 359 360 static inline void * __init memblock_alloc_from(phys_addr_t size, 361 phys_addr_t align, 362 phys_addr_t min_addr) 363 { 364 return memblock_alloc_try_nid(size, align, min_addr, 365 MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE); 366 } 367 368 static inline void * __init memblock_alloc_nopanic(phys_addr_t size, 369 phys_addr_t align) 370 { 371 return memblock_alloc_try_nid_nopanic(size, align, MEMBLOCK_LOW_LIMIT, 372 MEMBLOCK_ALLOC_ACCESSIBLE, 373 NUMA_NO_NODE); 374 } 375 376 static inline void * __init memblock_alloc_low(phys_addr_t size, 377 phys_addr_t align) 378 { 379 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 380 ARCH_LOW_ADDRESS_LIMIT, NUMA_NO_NODE); 381 } 382 static inline void * __init memblock_alloc_low_nopanic(phys_addr_t size, 383 phys_addr_t align) 384 { 385 return memblock_alloc_try_nid_nopanic(size, align, MEMBLOCK_LOW_LIMIT, 386 ARCH_LOW_ADDRESS_LIMIT, 387 NUMA_NO_NODE); 388 } 389 390 static inline void * __init memblock_alloc_from_nopanic(phys_addr_t size, 391 phys_addr_t align, 392 phys_addr_t min_addr) 393 { 394 return memblock_alloc_try_nid_nopanic(size, align, min_addr, 395 MEMBLOCK_ALLOC_ACCESSIBLE, 396 NUMA_NO_NODE); 397 } 398 399 static inline void * __init memblock_alloc_node(phys_addr_t size, 400 phys_addr_t align, int nid) 401 { 402 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 403 MEMBLOCK_ALLOC_ACCESSIBLE, nid); 404 } 405 406 static inline void * __init memblock_alloc_node_nopanic(phys_addr_t size, 407 int nid) 408 { 409 return memblock_alloc_try_nid_nopanic(size, SMP_CACHE_BYTES, 410 MEMBLOCK_LOW_LIMIT, 411 MEMBLOCK_ALLOC_ACCESSIBLE, nid); 412 } 413 414 static inline void __init memblock_free_early(phys_addr_t base, 415 phys_addr_t size) 416 { 417 memblock_free(base, size); 418 } 419 420 static inline void __init memblock_free_early_nid(phys_addr_t base, 421 phys_addr_t size, int nid) 422 { 423 memblock_free(base, size); 424 } 425 426 static inline void __init memblock_free_late(phys_addr_t base, phys_addr_t size) 427 { 428 __memblock_free_late(base, size); 429 } 430 431 /* 432 * Set the allocation direction to bottom-up or top-down. 433 */ 434 static inline void __init memblock_set_bottom_up(bool enable) 435 { 436 memblock.bottom_up = enable; 437 } 438 439 /* 440 * Check if the allocation direction is bottom-up or not. 441 * if this is true, that said, memblock will allocate memory 442 * in bottom-up direction. 443 */ 444 static inline bool memblock_bottom_up(void) 445 { 446 return memblock.bottom_up; 447 } 448 449 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align, 450 phys_addr_t start, phys_addr_t end, 451 enum memblock_flags flags); 452 phys_addr_t memblock_alloc_base_nid(phys_addr_t size, 453 phys_addr_t align, phys_addr_t max_addr, 454 int nid, enum memblock_flags flags); 455 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 456 phys_addr_t max_addr); 457 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align, 458 phys_addr_t max_addr); 459 phys_addr_t memblock_phys_mem_size(void); 460 phys_addr_t memblock_reserved_size(void); 461 phys_addr_t memblock_mem_size(unsigned long limit_pfn); 462 phys_addr_t memblock_start_of_DRAM(void); 463 phys_addr_t memblock_end_of_DRAM(void); 464 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 465 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size); 466 void memblock_mem_limit_remove_map(phys_addr_t limit); 467 bool memblock_is_memory(phys_addr_t addr); 468 bool memblock_is_map_memory(phys_addr_t addr); 469 bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 470 bool memblock_is_reserved(phys_addr_t addr); 471 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 472 473 extern void __memblock_dump_all(void); 474 475 static inline void memblock_dump_all(void) 476 { 477 if (memblock_debug) 478 __memblock_dump_all(); 479 } 480 481 /** 482 * memblock_set_current_limit - Set the current allocation limit to allow 483 * limiting allocations to what is currently 484 * accessible during boot 485 * @limit: New limit value (physical address) 486 */ 487 void memblock_set_current_limit(phys_addr_t limit); 488 489 490 phys_addr_t memblock_get_current_limit(void); 491 492 /* 493 * pfn conversion functions 494 * 495 * While the memory MEMBLOCKs should always be page aligned, the reserved 496 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 497 * idea of what they return for such non aligned MEMBLOCKs. 498 */ 499 500 /** 501 * memblock_region_memory_base_pfn - get the lowest pfn of the memory region 502 * @reg: memblock_region structure 503 * 504 * Return: the lowest pfn intersecting with the memory region 505 */ 506 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 507 { 508 return PFN_UP(reg->base); 509 } 510 511 /** 512 * memblock_region_memory_end_pfn - get the end pfn of the memory region 513 * @reg: memblock_region structure 514 * 515 * Return: the end_pfn of the reserved region 516 */ 517 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 518 { 519 return PFN_DOWN(reg->base + reg->size); 520 } 521 522 /** 523 * memblock_region_reserved_base_pfn - get the lowest pfn of the reserved region 524 * @reg: memblock_region structure 525 * 526 * Return: the lowest pfn intersecting with the reserved region 527 */ 528 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 529 { 530 return PFN_DOWN(reg->base); 531 } 532 533 /** 534 * memblock_region_reserved_end_pfn - get the end pfn of the reserved region 535 * @reg: memblock_region structure 536 * 537 * Return: the end_pfn of the reserved region 538 */ 539 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 540 { 541 return PFN_UP(reg->base + reg->size); 542 } 543 544 #define for_each_memblock(memblock_type, region) \ 545 for (region = memblock.memblock_type.regions; \ 546 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 547 region++) 548 549 #define for_each_memblock_type(i, memblock_type, rgn) \ 550 for (i = 0, rgn = &memblock_type->regions[0]; \ 551 i < memblock_type->cnt; \ 552 i++, rgn = &memblock_type->regions[i]) 553 554 extern void *alloc_large_system_hash(const char *tablename, 555 unsigned long bucketsize, 556 unsigned long numentries, 557 int scale, 558 int flags, 559 unsigned int *_hash_shift, 560 unsigned int *_hash_mask, 561 unsigned long low_limit, 562 unsigned long high_limit); 563 564 #define HASH_EARLY 0x00000001 /* Allocating during early boot? */ 565 #define HASH_SMALL 0x00000002 /* sub-page allocation allowed, min 566 * shift passed via *_hash_shift */ 567 #define HASH_ZERO 0x00000004 /* Zero allocated hash table */ 568 569 /* Only NUMA needs hash distribution. 64bit NUMA architectures have 570 * sufficient vmalloc space. 571 */ 572 #ifdef CONFIG_NUMA 573 #define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT) 574 extern int hashdist; /* Distribute hashes across NUMA nodes? */ 575 #else 576 #define hashdist (0) 577 #endif 578 579 #ifdef CONFIG_MEMTEST 580 extern void early_memtest(phys_addr_t start, phys_addr_t end); 581 #else 582 static inline void early_memtest(phys_addr_t start, phys_addr_t end) 583 { 584 } 585 #endif 586 587 #endif /* __KERNEL__ */ 588 589 #endif /* _LINUX_MEMBLOCK_H */ 590