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 char *name; 46 }; 47 48 struct memblock { 49 bool bottom_up; /* is bottom up direction? */ 50 phys_addr_t current_limit; 51 struct memblock_type memory; 52 struct memblock_type reserved; 53 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP 54 struct memblock_type physmem; 55 #endif 56 }; 57 58 extern struct memblock memblock; 59 extern int memblock_debug; 60 61 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK 62 #define __init_memblock __meminit 63 #define __initdata_memblock __meminitdata 64 void memblock_discard(void); 65 #else 66 #define __init_memblock 67 #define __initdata_memblock 68 #endif 69 70 #define memblock_dbg(fmt, ...) \ 71 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 72 73 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align, 74 phys_addr_t start, phys_addr_t end, 75 int nid, ulong flags); 76 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, 77 phys_addr_t size, phys_addr_t align); 78 void memblock_allow_resize(void); 79 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); 80 int memblock_add(phys_addr_t base, phys_addr_t size); 81 int memblock_remove(phys_addr_t base, phys_addr_t size); 82 int memblock_free(phys_addr_t base, phys_addr_t size); 83 int memblock_reserve(phys_addr_t base, phys_addr_t size); 84 void memblock_trim_memory(phys_addr_t align); 85 bool memblock_overlaps_region(struct memblock_type *type, 86 phys_addr_t base, phys_addr_t size); 87 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); 88 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); 89 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); 90 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size); 91 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size); 92 ulong choose_memblock_flags(void); 93 94 /* Low level functions */ 95 int memblock_add_range(struct memblock_type *type, 96 phys_addr_t base, phys_addr_t size, 97 int nid, unsigned long flags); 98 99 void __next_mem_range(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_mem_range_rev(u64 *idx, int nid, ulong flags, 105 struct memblock_type *type_a, 106 struct memblock_type *type_b, phys_addr_t *out_start, 107 phys_addr_t *out_end, int *out_nid); 108 109 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start, 110 phys_addr_t *out_end); 111 112 void __memblock_free_early(phys_addr_t base, phys_addr_t size); 113 void __memblock_free_late(phys_addr_t base, phys_addr_t size); 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, __next_reserved_mem_region(&i, p_start, p_end); \ 167 i != (u64)ULLONG_MAX; \ 168 __next_reserved_mem_region(&i, p_start, p_end)) 169 170 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 171 { 172 return m->flags & MEMBLOCK_HOTPLUG; 173 } 174 175 static inline bool memblock_is_mirror(struct memblock_region *m) 176 { 177 return m->flags & MEMBLOCK_MIRROR; 178 } 179 180 static inline bool memblock_is_nomap(struct memblock_region *m) 181 { 182 return m->flags & MEMBLOCK_NOMAP; 183 } 184 185 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 186 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 187 unsigned long *end_pfn); 188 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 189 unsigned long *out_end_pfn, int *out_nid); 190 unsigned long memblock_next_valid_pfn(unsigned long pfn, unsigned long max_pfn); 191 192 /** 193 * for_each_mem_pfn_range - early memory pfn range iterator 194 * @i: an integer used as loop variable 195 * @nid: node selector, %MAX_NUMNODES for all nodes 196 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 197 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 198 * @p_nid: ptr to int for nid of the range, can be %NULL 199 * 200 * Walks over configured memory ranges. 201 */ 202 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 203 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 204 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 205 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 206 207 /** 208 * for_each_free_mem_range - iterate through free memblock areas 209 * @i: u64 used as loop variable 210 * @nid: node selector, %NUMA_NO_NODE for all nodes 211 * @flags: pick from blocks based on memory attributes 212 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 213 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 214 * @p_nid: ptr to int for nid of the range, can be %NULL 215 * 216 * Walks over free (memory && !reserved) areas of memblock. Available as 217 * soon as memblock is initialized. 218 */ 219 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ 220 for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ 221 nid, flags, p_start, p_end, p_nid) 222 223 /** 224 * for_each_free_mem_range_reverse - rev-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 in reverse 233 * order. Available as soon as memblock is initialized. 234 */ 235 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \ 236 p_nid) \ 237 for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \ 238 nid, flags, p_start, p_end, p_nid) 239 240 static inline void memblock_set_region_flags(struct memblock_region *r, 241 unsigned long flags) 242 { 243 r->flags |= flags; 244 } 245 246 static inline void memblock_clear_region_flags(struct memblock_region *r, 247 unsigned long flags) 248 { 249 r->flags &= ~flags; 250 } 251 252 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 253 int memblock_set_node(phys_addr_t base, phys_addr_t size, 254 struct memblock_type *type, int nid); 255 256 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 257 { 258 r->nid = nid; 259 } 260 261 static inline int memblock_get_region_node(const struct memblock_region *r) 262 { 263 return r->nid; 264 } 265 #else 266 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 267 { 268 } 269 270 static inline int memblock_get_region_node(const struct memblock_region *r) 271 { 272 return 0; 273 } 274 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 275 276 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 277 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 278 279 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align); 280 281 /* 282 * Set the allocation direction to bottom-up or top-down. 283 */ 284 static inline void __init memblock_set_bottom_up(bool enable) 285 { 286 memblock.bottom_up = enable; 287 } 288 289 /* 290 * Check if the allocation direction is bottom-up or not. 291 * if this is true, that said, memblock will allocate memory 292 * in bottom-up direction. 293 */ 294 static inline bool memblock_bottom_up(void) 295 { 296 return memblock.bottom_up; 297 } 298 299 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */ 300 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 301 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 302 303 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align, 304 phys_addr_t start, phys_addr_t end, 305 ulong flags); 306 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 307 phys_addr_t max_addr); 308 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align, 309 phys_addr_t max_addr); 310 phys_addr_t memblock_phys_mem_size(void); 311 phys_addr_t memblock_reserved_size(void); 312 phys_addr_t memblock_mem_size(unsigned long limit_pfn); 313 phys_addr_t memblock_start_of_DRAM(void); 314 phys_addr_t memblock_end_of_DRAM(void); 315 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 316 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size); 317 void memblock_mem_limit_remove_map(phys_addr_t limit); 318 bool memblock_is_memory(phys_addr_t addr); 319 int memblock_is_map_memory(phys_addr_t addr); 320 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 321 bool memblock_is_reserved(phys_addr_t addr); 322 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 323 324 extern void __memblock_dump_all(void); 325 326 static inline void memblock_dump_all(void) 327 { 328 if (memblock_debug) 329 __memblock_dump_all(); 330 } 331 332 /** 333 * memblock_set_current_limit - Set the current allocation limit to allow 334 * limiting allocations to what is currently 335 * accessible during boot 336 * @limit: New limit value (physical address) 337 */ 338 void memblock_set_current_limit(phys_addr_t limit); 339 340 341 phys_addr_t memblock_get_current_limit(void); 342 343 /* 344 * pfn conversion functions 345 * 346 * While the memory MEMBLOCKs should always be page aligned, the reserved 347 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 348 * idea of what they return for such non aligned MEMBLOCKs. 349 */ 350 351 /** 352 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region 353 * @reg: memblock_region structure 354 */ 355 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 356 { 357 return PFN_UP(reg->base); 358 } 359 360 /** 361 * memblock_region_memory_end_pfn - Return the end_pfn this region 362 * @reg: memblock_region structure 363 */ 364 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 365 { 366 return PFN_DOWN(reg->base + reg->size); 367 } 368 369 /** 370 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region 371 * @reg: memblock_region structure 372 */ 373 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 374 { 375 return PFN_DOWN(reg->base); 376 } 377 378 /** 379 * memblock_region_reserved_end_pfn - Return the end_pfn this region 380 * @reg: memblock_region structure 381 */ 382 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 383 { 384 return PFN_UP(reg->base + reg->size); 385 } 386 387 #define for_each_memblock(memblock_type, region) \ 388 for (region = memblock.memblock_type.regions; \ 389 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 390 region++) 391 392 #define for_each_memblock_type(memblock_type, rgn) \ 393 for (idx = 0, rgn = &memblock_type->regions[0]; \ 394 idx < memblock_type->cnt; \ 395 idx++, rgn = &memblock_type->regions[idx]) 396 397 #ifdef CONFIG_MEMTEST 398 extern void early_memtest(phys_addr_t start, phys_addr_t end); 399 #else 400 static inline void early_memtest(phys_addr_t start, phys_addr_t end) 401 { 402 } 403 #endif 404 405 extern unsigned long memblock_reserved_memory_within(phys_addr_t start_addr, 406 phys_addr_t end_addr); 407 #else 408 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align) 409 { 410 return 0; 411 } 412 413 static inline unsigned long memblock_reserved_memory_within(phys_addr_t start_addr, 414 phys_addr_t end_addr) 415 { 416 return 0; 417 } 418 419 #endif /* CONFIG_HAVE_MEMBLOCK */ 420 421 #endif /* __KERNEL__ */ 422 423 #endif /* _LINUX_MEMBLOCK_H */ 424