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, \ 167 __next_reserved_mem_region(&i, p_start, p_end); \ 168 i != (u64)ULLONG_MAX; \ 169 __next_reserved_mem_region(&i, p_start, p_end)) 170 171 #ifdef CONFIG_MOVABLE_NODE 172 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 173 { 174 return m->flags & MEMBLOCK_HOTPLUG; 175 } 176 177 static inline bool __init_memblock movable_node_is_enabled(void) 178 { 179 return movable_node_enabled; 180 } 181 #else 182 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 183 { 184 return false; 185 } 186 static inline bool movable_node_is_enabled(void) 187 { 188 return false; 189 } 190 #endif 191 192 static inline bool memblock_is_mirror(struct memblock_region *m) 193 { 194 return m->flags & MEMBLOCK_MIRROR; 195 } 196 197 static inline bool memblock_is_nomap(struct memblock_region *m) 198 { 199 return m->flags & MEMBLOCK_NOMAP; 200 } 201 202 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 203 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 204 unsigned long *end_pfn); 205 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 206 unsigned long *out_end_pfn, int *out_nid); 207 208 /** 209 * for_each_mem_pfn_range - early memory pfn range iterator 210 * @i: an integer used as loop variable 211 * @nid: node selector, %MAX_NUMNODES for all nodes 212 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 213 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 214 * @p_nid: ptr to int for nid of the range, can be %NULL 215 * 216 * Walks over configured memory ranges. 217 */ 218 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 219 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 220 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 221 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 222 223 /** 224 * for_each_free_mem_range - iterate through free memblock areas 225 * @i: u64 used as loop variable 226 * @nid: node selector, %NUMA_NO_NODE for all nodes 227 * @flags: pick from blocks based on memory attributes 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 * 232 * Walks over free (memory && !reserved) areas of memblock. Available as 233 * soon as memblock is initialized. 234 */ 235 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ 236 for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ 237 nid, flags, p_start, p_end, p_nid) 238 239 /** 240 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 241 * @i: u64 used as loop variable 242 * @nid: node selector, %NUMA_NO_NODE for all nodes 243 * @flags: pick from blocks based on memory attributes 244 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 245 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 246 * @p_nid: ptr to int for nid of the range, can be %NULL 247 * 248 * Walks over free (memory && !reserved) areas of memblock in reverse 249 * order. Available as soon as memblock is initialized. 250 */ 251 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \ 252 p_nid) \ 253 for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \ 254 nid, flags, p_start, p_end, p_nid) 255 256 static inline void memblock_set_region_flags(struct memblock_region *r, 257 unsigned long flags) 258 { 259 r->flags |= flags; 260 } 261 262 static inline void memblock_clear_region_flags(struct memblock_region *r, 263 unsigned long flags) 264 { 265 r->flags &= ~flags; 266 } 267 268 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 269 int memblock_set_node(phys_addr_t base, phys_addr_t size, 270 struct memblock_type *type, int nid); 271 272 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 273 { 274 r->nid = nid; 275 } 276 277 static inline int memblock_get_region_node(const struct memblock_region *r) 278 { 279 return r->nid; 280 } 281 #else 282 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 283 { 284 } 285 286 static inline int memblock_get_region_node(const struct memblock_region *r) 287 { 288 return 0; 289 } 290 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 291 292 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 293 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 294 295 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align); 296 297 #ifdef CONFIG_MOVABLE_NODE 298 /* 299 * Set the allocation direction to bottom-up or top-down. 300 */ 301 static inline void __init memblock_set_bottom_up(bool enable) 302 { 303 memblock.bottom_up = enable; 304 } 305 306 /* 307 * Check if the allocation direction is bottom-up or not. 308 * if this is true, that said, memblock will allocate memory 309 * in bottom-up direction. 310 */ 311 static inline bool memblock_bottom_up(void) 312 { 313 return memblock.bottom_up; 314 } 315 #else 316 static inline void __init memblock_set_bottom_up(bool enable) {} 317 static inline bool memblock_bottom_up(void) { return false; } 318 #endif 319 320 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */ 321 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 322 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 323 324 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align, 325 phys_addr_t start, phys_addr_t end, 326 ulong flags); 327 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 328 phys_addr_t max_addr); 329 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align, 330 phys_addr_t max_addr); 331 phys_addr_t memblock_phys_mem_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 bool memblock_is_memory(phys_addr_t addr); 337 int memblock_is_map_memory(phys_addr_t addr); 338 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 339 bool memblock_is_reserved(phys_addr_t addr); 340 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 341 342 extern void __memblock_dump_all(void); 343 344 static inline void memblock_dump_all(void) 345 { 346 if (memblock_debug) 347 __memblock_dump_all(); 348 } 349 350 /** 351 * memblock_set_current_limit - Set the current allocation limit to allow 352 * limiting allocations to what is currently 353 * accessible during boot 354 * @limit: New limit value (physical address) 355 */ 356 void memblock_set_current_limit(phys_addr_t limit); 357 358 359 phys_addr_t memblock_get_current_limit(void); 360 361 /* 362 * pfn conversion functions 363 * 364 * While the memory MEMBLOCKs should always be page aligned, the reserved 365 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 366 * idea of what they return for such non aligned MEMBLOCKs. 367 */ 368 369 /** 370 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region 371 * @reg: memblock_region structure 372 */ 373 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 374 { 375 return PFN_UP(reg->base); 376 } 377 378 /** 379 * memblock_region_memory_end_pfn - Return the end_pfn this region 380 * @reg: memblock_region structure 381 */ 382 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 383 { 384 return PFN_DOWN(reg->base + reg->size); 385 } 386 387 /** 388 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region 389 * @reg: memblock_region structure 390 */ 391 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 392 { 393 return PFN_DOWN(reg->base); 394 } 395 396 /** 397 * memblock_region_reserved_end_pfn - Return the end_pfn this region 398 * @reg: memblock_region structure 399 */ 400 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 401 { 402 return PFN_UP(reg->base + reg->size); 403 } 404 405 #define for_each_memblock(memblock_type, region) \ 406 for (region = memblock.memblock_type.regions; \ 407 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 408 region++) 409 410 #define for_each_memblock_type(memblock_type, rgn) \ 411 idx = 0; \ 412 rgn = &memblock_type->regions[idx]; \ 413 for (idx = 0; 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