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 int memblock_remove_range(struct memblock_type *type, 93 phys_addr_t base, 94 phys_addr_t size); 95 96 void __next_mem_range(u64 *idx, int nid, ulong flags, 97 struct memblock_type *type_a, 98 struct memblock_type *type_b, phys_addr_t *out_start, 99 phys_addr_t *out_end, int *out_nid); 100 101 void __next_mem_range_rev(u64 *idx, int nid, ulong flags, 102 struct memblock_type *type_a, 103 struct memblock_type *type_b, phys_addr_t *out_start, 104 phys_addr_t *out_end, int *out_nid); 105 106 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start, 107 phys_addr_t *out_end); 108 109 /** 110 * for_each_mem_range - iterate through memblock areas from type_a and not 111 * included in type_b. Or just type_a if type_b is NULL. 112 * @i: u64 used as loop variable 113 * @type_a: ptr to memblock_type to iterate 114 * @type_b: ptr to memblock_type which excludes from the iteration 115 * @nid: node selector, %NUMA_NO_NODE for all nodes 116 * @flags: pick from blocks based on memory attributes 117 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 118 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 119 * @p_nid: ptr to int for nid of the range, can be %NULL 120 */ 121 #define for_each_mem_range(i, type_a, type_b, nid, flags, \ 122 p_start, p_end, p_nid) \ 123 for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \ 124 p_start, p_end, p_nid); \ 125 i != (u64)ULLONG_MAX; \ 126 __next_mem_range(&i, nid, flags, type_a, type_b, \ 127 p_start, p_end, p_nid)) 128 129 /** 130 * for_each_mem_range_rev - reverse iterate through memblock areas from 131 * type_a and not included in type_b. Or just type_a if type_b is NULL. 132 * @i: u64 used as loop variable 133 * @type_a: ptr to memblock_type to iterate 134 * @type_b: ptr to memblock_type which excludes from the iteration 135 * @nid: node selector, %NUMA_NO_NODE for all nodes 136 * @flags: pick from blocks based on memory attributes 137 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 138 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 139 * @p_nid: ptr to int for nid of the range, can be %NULL 140 */ 141 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags, \ 142 p_start, p_end, p_nid) \ 143 for (i = (u64)ULLONG_MAX, \ 144 __next_mem_range_rev(&i, nid, flags, type_a, type_b,\ 145 p_start, p_end, p_nid); \ 146 i != (u64)ULLONG_MAX; \ 147 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ 148 p_start, p_end, p_nid)) 149 150 /** 151 * for_each_reserved_mem_region - iterate over all reserved memblock areas 152 * @i: u64 used as loop variable 153 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 154 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 155 * 156 * Walks over reserved areas of memblock. Available as soon as memblock 157 * is initialized. 158 */ 159 #define for_each_reserved_mem_region(i, p_start, p_end) \ 160 for (i = 0UL, \ 161 __next_reserved_mem_region(&i, p_start, p_end); \ 162 i != (u64)ULLONG_MAX; \ 163 __next_reserved_mem_region(&i, p_start, p_end)) 164 165 #ifdef CONFIG_MOVABLE_NODE 166 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 167 { 168 return m->flags & MEMBLOCK_HOTPLUG; 169 } 170 171 static inline bool movable_node_is_enabled(void) 172 { 173 return movable_node_enabled; 174 } 175 #else 176 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 177 { 178 return false; 179 } 180 static inline bool movable_node_is_enabled(void) 181 { 182 return false; 183 } 184 #endif 185 186 static inline bool memblock_is_mirror(struct memblock_region *m) 187 { 188 return m->flags & MEMBLOCK_MIRROR; 189 } 190 191 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 192 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 193 unsigned long *end_pfn); 194 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 195 unsigned long *out_end_pfn, int *out_nid); 196 197 /** 198 * for_each_mem_pfn_range - early memory pfn range iterator 199 * @i: an integer used as loop variable 200 * @nid: node selector, %MAX_NUMNODES for all nodes 201 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 202 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 203 * @p_nid: ptr to int for nid of the range, can be %NULL 204 * 205 * Walks over configured memory ranges. 206 */ 207 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 208 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 209 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 210 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 211 212 /** 213 * for_each_free_mem_range - iterate through free memblock areas 214 * @i: u64 used as loop variable 215 * @nid: node selector, %NUMA_NO_NODE for all nodes 216 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 217 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 218 * @p_nid: ptr to int for nid of the range, can be %NULL 219 * @flags: pick from blocks based on memory attributes 220 * 221 * Walks over free (memory && !reserved) areas of memblock. Available as 222 * soon as memblock is initialized. 223 */ 224 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ 225 for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ 226 nid, flags, p_start, p_end, p_nid) 227 228 /** 229 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 230 * @i: u64 used as loop variable 231 * @nid: node selector, %NUMA_NO_NODE for all nodes 232 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 233 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 234 * @p_nid: ptr to int for nid of the range, can be %NULL 235 * @flags: pick from blocks based on memory attributes 236 * 237 * Walks over free (memory && !reserved) areas of memblock in reverse 238 * order. Available as soon as memblock is initialized. 239 */ 240 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \ 241 p_nid) \ 242 for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \ 243 nid, flags, p_start, p_end, p_nid) 244 245 static inline void memblock_set_region_flags(struct memblock_region *r, 246 unsigned long flags) 247 { 248 r->flags |= flags; 249 } 250 251 static inline void memblock_clear_region_flags(struct memblock_region *r, 252 unsigned long flags) 253 { 254 r->flags &= ~flags; 255 } 256 257 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 258 int memblock_set_node(phys_addr_t base, phys_addr_t size, 259 struct memblock_type *type, int nid); 260 261 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 262 { 263 r->nid = nid; 264 } 265 266 static inline int memblock_get_region_node(const struct memblock_region *r) 267 { 268 return r->nid; 269 } 270 #else 271 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 272 { 273 } 274 275 static inline int memblock_get_region_node(const struct memblock_region *r) 276 { 277 return 0; 278 } 279 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 280 281 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 282 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 283 284 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align); 285 286 #ifdef CONFIG_MOVABLE_NODE 287 /* 288 * Set the allocation direction to bottom-up or top-down. 289 */ 290 static inline void __init memblock_set_bottom_up(bool enable) 291 { 292 memblock.bottom_up = enable; 293 } 294 295 /* 296 * Check if the allocation direction is bottom-up or not. 297 * if this is true, that said, memblock will allocate memory 298 * in bottom-up direction. 299 */ 300 static inline bool memblock_bottom_up(void) 301 { 302 return memblock.bottom_up; 303 } 304 #else 305 static inline void __init memblock_set_bottom_up(bool enable) {} 306 static inline bool memblock_bottom_up(void) { return false; } 307 #endif 308 309 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */ 310 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 311 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 312 313 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align, 314 phys_addr_t start, phys_addr_t end, 315 ulong flags); 316 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 317 phys_addr_t max_addr); 318 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align, 319 phys_addr_t max_addr); 320 phys_addr_t memblock_phys_mem_size(void); 321 phys_addr_t memblock_mem_size(unsigned long limit_pfn); 322 phys_addr_t memblock_start_of_DRAM(void); 323 phys_addr_t memblock_end_of_DRAM(void); 324 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 325 int memblock_is_memory(phys_addr_t addr); 326 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 327 int memblock_is_reserved(phys_addr_t addr); 328 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 329 330 extern void __memblock_dump_all(void); 331 332 static inline void memblock_dump_all(void) 333 { 334 if (memblock_debug) 335 __memblock_dump_all(); 336 } 337 338 /** 339 * memblock_set_current_limit - Set the current allocation limit to allow 340 * limiting allocations to what is currently 341 * accessible during boot 342 * @limit: New limit value (physical address) 343 */ 344 void memblock_set_current_limit(phys_addr_t limit); 345 346 347 phys_addr_t memblock_get_current_limit(void); 348 349 /* 350 * pfn conversion functions 351 * 352 * While the memory MEMBLOCKs should always be page aligned, the reserved 353 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 354 * idea of what they return for such non aligned MEMBLOCKs. 355 */ 356 357 /** 358 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region 359 * @reg: memblock_region structure 360 */ 361 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 362 { 363 return PFN_UP(reg->base); 364 } 365 366 /** 367 * memblock_region_memory_end_pfn - Return the end_pfn this region 368 * @reg: memblock_region structure 369 */ 370 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 371 { 372 return PFN_DOWN(reg->base + reg->size); 373 } 374 375 /** 376 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region 377 * @reg: memblock_region structure 378 */ 379 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 380 { 381 return PFN_DOWN(reg->base); 382 } 383 384 /** 385 * memblock_region_reserved_end_pfn - Return the end_pfn this region 386 * @reg: memblock_region structure 387 */ 388 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 389 { 390 return PFN_UP(reg->base + reg->size); 391 } 392 393 #define for_each_memblock(memblock_type, region) \ 394 for (region = memblock.memblock_type.regions; \ 395 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 396 region++) 397 398 399 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK 400 #define __init_memblock __meminit 401 #define __initdata_memblock __meminitdata 402 #else 403 #define __init_memblock 404 #define __initdata_memblock 405 #endif 406 407 #ifdef CONFIG_MEMTEST 408 extern void early_memtest(phys_addr_t start, phys_addr_t end); 409 #else 410 static inline void early_memtest(phys_addr_t start, phys_addr_t end) 411 { 412 } 413 #endif 414 415 #else 416 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align) 417 { 418 return 0; 419 } 420 421 #endif /* CONFIG_HAVE_MEMBLOCK */ 422 423 #endif /* __KERNEL__ */ 424 425 #endif /* _LINUX_MEMBLOCK_H */ 426