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 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); 81 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); 82 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); 83 ulong choose_memblock_flags(void); 84 85 /* Low level functions */ 86 int memblock_add_range(struct memblock_type *type, 87 phys_addr_t base, phys_addr_t size, 88 int nid, unsigned long flags); 89 90 int memblock_remove_range(struct memblock_type *type, 91 phys_addr_t base, 92 phys_addr_t size); 93 94 void __next_mem_range(u64 *idx, int nid, ulong flags, 95 struct memblock_type *type_a, 96 struct memblock_type *type_b, phys_addr_t *out_start, 97 phys_addr_t *out_end, int *out_nid); 98 99 void __next_mem_range_rev(u64 *idx, int nid, ulong flags, 100 struct memblock_type *type_a, 101 struct memblock_type *type_b, phys_addr_t *out_start, 102 phys_addr_t *out_end, int *out_nid); 103 104 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start, 105 phys_addr_t *out_end); 106 107 /** 108 * for_each_mem_range - iterate through memblock areas from type_a and not 109 * included in type_b. Or just type_a if type_b is NULL. 110 * @i: u64 used as loop variable 111 * @type_a: ptr to memblock_type to iterate 112 * @type_b: ptr to memblock_type which excludes from the iteration 113 * @nid: node selector, %NUMA_NO_NODE for all nodes 114 * @flags: pick from blocks based on memory attributes 115 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 116 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 117 * @p_nid: ptr to int for nid of the range, can be %NULL 118 */ 119 #define for_each_mem_range(i, type_a, type_b, nid, flags, \ 120 p_start, p_end, p_nid) \ 121 for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \ 122 p_start, p_end, p_nid); \ 123 i != (u64)ULLONG_MAX; \ 124 __next_mem_range(&i, nid, flags, type_a, type_b, \ 125 p_start, p_end, p_nid)) 126 127 /** 128 * for_each_mem_range_rev - reverse iterate through memblock areas from 129 * type_a and not included in type_b. Or just type_a if type_b is NULL. 130 * @i: u64 used as loop variable 131 * @type_a: ptr to memblock_type to iterate 132 * @type_b: ptr to memblock_type which excludes from the iteration 133 * @nid: node selector, %NUMA_NO_NODE for all nodes 134 * @flags: pick from blocks based on memory attributes 135 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 136 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 137 * @p_nid: ptr to int for nid of the range, can be %NULL 138 */ 139 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags, \ 140 p_start, p_end, p_nid) \ 141 for (i = (u64)ULLONG_MAX, \ 142 __next_mem_range_rev(&i, nid, flags, type_a, type_b,\ 143 p_start, p_end, p_nid); \ 144 i != (u64)ULLONG_MAX; \ 145 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ 146 p_start, p_end, p_nid)) 147 148 /** 149 * for_each_reserved_mem_region - iterate over all reserved memblock areas 150 * @i: u64 used as loop variable 151 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 152 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 153 * 154 * Walks over reserved areas of memblock. Available as soon as memblock 155 * is initialized. 156 */ 157 #define for_each_reserved_mem_region(i, p_start, p_end) \ 158 for (i = 0UL, \ 159 __next_reserved_mem_region(&i, p_start, p_end); \ 160 i != (u64)ULLONG_MAX; \ 161 __next_reserved_mem_region(&i, p_start, p_end)) 162 163 #ifdef CONFIG_MOVABLE_NODE 164 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 165 { 166 return m->flags & MEMBLOCK_HOTPLUG; 167 } 168 169 static inline bool movable_node_is_enabled(void) 170 { 171 return movable_node_enabled; 172 } 173 #else 174 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 175 { 176 return false; 177 } 178 static inline bool movable_node_is_enabled(void) 179 { 180 return false; 181 } 182 #endif 183 184 static inline bool memblock_is_mirror(struct memblock_region *m) 185 { 186 return m->flags & MEMBLOCK_MIRROR; 187 } 188 189 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 190 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 191 unsigned long *end_pfn); 192 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 193 unsigned long *out_end_pfn, int *out_nid); 194 195 /** 196 * for_each_mem_pfn_range - early memory pfn range iterator 197 * @i: an integer used as loop variable 198 * @nid: node selector, %MAX_NUMNODES for all nodes 199 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 200 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 201 * @p_nid: ptr to int for nid of the range, can be %NULL 202 * 203 * Walks over configured memory ranges. 204 */ 205 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 206 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 207 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 208 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 209 210 /** 211 * for_each_free_mem_range - iterate through free memblock areas 212 * @i: u64 used as loop variable 213 * @nid: node selector, %NUMA_NO_NODE for all nodes 214 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 215 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 216 * @p_nid: ptr to int for nid of the range, can be %NULL 217 * @flags: pick from blocks based on memory attributes 218 * 219 * Walks over free (memory && !reserved) areas of memblock. Available as 220 * soon as memblock is initialized. 221 */ 222 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ 223 for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ 224 nid, flags, p_start, p_end, p_nid) 225 226 /** 227 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 228 * @i: u64 used as loop variable 229 * @nid: node selector, %NUMA_NO_NODE for all nodes 230 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 231 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 232 * @p_nid: ptr to int for nid of the range, can be %NULL 233 * @flags: pick from blocks based on memory attributes 234 * 235 * Walks over free (memory && !reserved) areas of memblock in reverse 236 * order. Available as soon as memblock is initialized. 237 */ 238 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \ 239 p_nid) \ 240 for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \ 241 nid, flags, p_start, p_end, p_nid) 242 243 static inline void memblock_set_region_flags(struct memblock_region *r, 244 unsigned long flags) 245 { 246 r->flags |= flags; 247 } 248 249 static inline void memblock_clear_region_flags(struct memblock_region *r, 250 unsigned long flags) 251 { 252 r->flags &= ~flags; 253 } 254 255 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 256 int memblock_set_node(phys_addr_t base, phys_addr_t size, 257 struct memblock_type *type, int nid); 258 259 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 260 { 261 r->nid = nid; 262 } 263 264 static inline int memblock_get_region_node(const struct memblock_region *r) 265 { 266 return r->nid; 267 } 268 #else 269 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 270 { 271 } 272 273 static inline int memblock_get_region_node(const struct memblock_region *r) 274 { 275 return 0; 276 } 277 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 278 279 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 280 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 281 282 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align); 283 284 #ifdef CONFIG_MOVABLE_NODE 285 /* 286 * Set the allocation direction to bottom-up or top-down. 287 */ 288 static inline void __init memblock_set_bottom_up(bool enable) 289 { 290 memblock.bottom_up = enable; 291 } 292 293 /* 294 * Check if the allocation direction is bottom-up or not. 295 * if this is true, that said, memblock will allocate memory 296 * in bottom-up direction. 297 */ 298 static inline bool memblock_bottom_up(void) 299 { 300 return memblock.bottom_up; 301 } 302 #else 303 static inline void __init memblock_set_bottom_up(bool enable) {} 304 static inline bool memblock_bottom_up(void) { return false; } 305 #endif 306 307 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */ 308 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 309 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 310 311 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align, 312 phys_addr_t start, phys_addr_t end, 313 ulong flags); 314 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 315 phys_addr_t max_addr); 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_phys_mem_size(void); 319 phys_addr_t memblock_mem_size(unsigned long limit_pfn); 320 phys_addr_t memblock_start_of_DRAM(void); 321 phys_addr_t memblock_end_of_DRAM(void); 322 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 323 int memblock_is_memory(phys_addr_t addr); 324 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 325 int memblock_is_reserved(phys_addr_t addr); 326 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 327 328 extern void __memblock_dump_all(void); 329 330 static inline void memblock_dump_all(void) 331 { 332 if (memblock_debug) 333 __memblock_dump_all(); 334 } 335 336 /** 337 * memblock_set_current_limit - Set the current allocation limit to allow 338 * limiting allocations to what is currently 339 * accessible during boot 340 * @limit: New limit value (physical address) 341 */ 342 void memblock_set_current_limit(phys_addr_t limit); 343 344 345 phys_addr_t memblock_get_current_limit(void); 346 347 /* 348 * pfn conversion functions 349 * 350 * While the memory MEMBLOCKs should always be page aligned, the reserved 351 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 352 * idea of what they return for such non aligned MEMBLOCKs. 353 */ 354 355 /** 356 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region 357 * @reg: memblock_region structure 358 */ 359 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 360 { 361 return PFN_UP(reg->base); 362 } 363 364 /** 365 * memblock_region_memory_end_pfn - Return the end_pfn this region 366 * @reg: memblock_region structure 367 */ 368 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 369 { 370 return PFN_DOWN(reg->base + reg->size); 371 } 372 373 /** 374 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region 375 * @reg: memblock_region structure 376 */ 377 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 378 { 379 return PFN_DOWN(reg->base); 380 } 381 382 /** 383 * memblock_region_reserved_end_pfn - Return the end_pfn this region 384 * @reg: memblock_region structure 385 */ 386 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 387 { 388 return PFN_UP(reg->base + reg->size); 389 } 390 391 #define for_each_memblock(memblock_type, region) \ 392 for (region = memblock.memblock_type.regions; \ 393 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 394 region++) 395 396 397 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK 398 #define __init_memblock __meminit 399 #define __initdata_memblock __meminitdata 400 #else 401 #define __init_memblock 402 #define __initdata_memblock 403 #endif 404 405 #ifdef CONFIG_MEMTEST 406 extern void early_memtest(phys_addr_t start, phys_addr_t end); 407 #else 408 static inline void early_memtest(phys_addr_t start, phys_addr_t end) 409 { 410 } 411 #endif 412 413 #else 414 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align) 415 { 416 return 0; 417 } 418 419 #endif /* CONFIG_HAVE_MEMBLOCK */ 420 421 #endif /* __KERNEL__ */ 422 423 #endif /* _LINUX_MEMBLOCK_H */ 424