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 #else 65 #define __init_memblock 66 #define __initdata_memblock 67 #endif 68 69 #define memblock_dbg(fmt, ...) \ 70 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 71 72 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align, 73 phys_addr_t start, phys_addr_t end, 74 int nid, ulong flags); 75 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, 76 phys_addr_t size, phys_addr_t align); 77 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr); 78 phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr); 79 void memblock_allow_resize(void); 80 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); 81 int memblock_add(phys_addr_t base, phys_addr_t size); 82 int memblock_remove(phys_addr_t base, phys_addr_t size); 83 int memblock_free(phys_addr_t base, phys_addr_t size); 84 int memblock_reserve(phys_addr_t base, phys_addr_t size); 85 void memblock_trim_memory(phys_addr_t align); 86 bool memblock_overlaps_region(struct memblock_type *type, 87 phys_addr_t base, phys_addr_t size); 88 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); 89 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); 90 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); 91 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size); 92 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size); 93 ulong choose_memblock_flags(void); 94 95 /* Low level functions */ 96 int memblock_add_range(struct memblock_type *type, 97 phys_addr_t base, phys_addr_t size, 98 int nid, unsigned long flags); 99 100 void __next_mem_range(u64 *idx, int nid, ulong flags, 101 struct memblock_type *type_a, 102 struct memblock_type *type_b, phys_addr_t *out_start, 103 phys_addr_t *out_end, int *out_nid); 104 105 void __next_mem_range_rev(u64 *idx, int nid, ulong flags, 106 struct memblock_type *type_a, 107 struct memblock_type *type_b, phys_addr_t *out_start, 108 phys_addr_t *out_end, int *out_nid); 109 110 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start, 111 phys_addr_t *out_end); 112 113 /** 114 * for_each_mem_range - iterate through memblock areas from type_a and not 115 * included in type_b. Or just type_a if type_b is NULL. 116 * @i: u64 used as loop variable 117 * @type_a: ptr to memblock_type to iterate 118 * @type_b: ptr to memblock_type which excludes from the iteration 119 * @nid: node selector, %NUMA_NO_NODE for all nodes 120 * @flags: pick from blocks based on memory attributes 121 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 122 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 123 * @p_nid: ptr to int for nid of the range, can be %NULL 124 */ 125 #define for_each_mem_range(i, type_a, type_b, nid, flags, \ 126 p_start, p_end, p_nid) \ 127 for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \ 128 p_start, p_end, p_nid); \ 129 i != (u64)ULLONG_MAX; \ 130 __next_mem_range(&i, nid, flags, type_a, type_b, \ 131 p_start, p_end, p_nid)) 132 133 /** 134 * for_each_mem_range_rev - reverse iterate through memblock areas from 135 * type_a and not included in type_b. Or just type_a if type_b is NULL. 136 * @i: u64 used as loop variable 137 * @type_a: ptr to memblock_type to iterate 138 * @type_b: ptr to memblock_type which excludes from the iteration 139 * @nid: node selector, %NUMA_NO_NODE for all nodes 140 * @flags: pick from blocks based on memory attributes 141 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 142 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 143 * @p_nid: ptr to int for nid of the range, can be %NULL 144 */ 145 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags, \ 146 p_start, p_end, p_nid) \ 147 for (i = (u64)ULLONG_MAX, \ 148 __next_mem_range_rev(&i, nid, flags, type_a, type_b,\ 149 p_start, p_end, p_nid); \ 150 i != (u64)ULLONG_MAX; \ 151 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ 152 p_start, p_end, p_nid)) 153 154 /** 155 * for_each_reserved_mem_region - iterate over all reserved memblock areas 156 * @i: u64 used as loop variable 157 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 158 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 159 * 160 * Walks over reserved areas of memblock. Available as soon as memblock 161 * is initialized. 162 */ 163 #define for_each_reserved_mem_region(i, p_start, p_end) \ 164 for (i = 0UL, __next_reserved_mem_region(&i, p_start, p_end); \ 165 i != (u64)ULLONG_MAX; \ 166 __next_reserved_mem_region(&i, p_start, p_end)) 167 168 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 169 { 170 return m->flags & MEMBLOCK_HOTPLUG; 171 } 172 173 static inline bool memblock_is_mirror(struct memblock_region *m) 174 { 175 return m->flags & MEMBLOCK_MIRROR; 176 } 177 178 static inline bool memblock_is_nomap(struct memblock_region *m) 179 { 180 return m->flags & MEMBLOCK_NOMAP; 181 } 182 183 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 184 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 185 unsigned long *end_pfn); 186 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 187 unsigned long *out_end_pfn, int *out_nid); 188 unsigned long memblock_next_valid_pfn(unsigned long pfn, unsigned long max_pfn); 189 190 /** 191 * for_each_mem_pfn_range - early memory pfn range iterator 192 * @i: an integer used as loop variable 193 * @nid: node selector, %MAX_NUMNODES for all nodes 194 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 195 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 196 * @p_nid: ptr to int for nid of the range, can be %NULL 197 * 198 * Walks over configured memory ranges. 199 */ 200 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 201 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 202 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 203 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 204 205 /** 206 * for_each_free_mem_range - iterate through free memblock areas 207 * @i: u64 used as loop variable 208 * @nid: node selector, %NUMA_NO_NODE for all nodes 209 * @flags: pick from blocks based on memory attributes 210 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 211 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 212 * @p_nid: ptr to int for nid of the range, can be %NULL 213 * 214 * Walks over free (memory && !reserved) areas of memblock. Available as 215 * soon as memblock is initialized. 216 */ 217 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ 218 for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ 219 nid, flags, p_start, p_end, p_nid) 220 221 /** 222 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 223 * @i: u64 used as loop variable 224 * @nid: node selector, %NUMA_NO_NODE for all nodes 225 * @flags: pick from blocks based on memory attributes 226 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 227 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 228 * @p_nid: ptr to int for nid of the range, can be %NULL 229 * 230 * Walks over free (memory && !reserved) areas of memblock in reverse 231 * order. Available as soon as memblock is initialized. 232 */ 233 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \ 234 p_nid) \ 235 for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \ 236 nid, flags, p_start, p_end, p_nid) 237 238 static inline void memblock_set_region_flags(struct memblock_region *r, 239 unsigned long flags) 240 { 241 r->flags |= flags; 242 } 243 244 static inline void memblock_clear_region_flags(struct memblock_region *r, 245 unsigned long flags) 246 { 247 r->flags &= ~flags; 248 } 249 250 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 251 int memblock_set_node(phys_addr_t base, phys_addr_t size, 252 struct memblock_type *type, int nid); 253 254 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 255 { 256 r->nid = nid; 257 } 258 259 static inline int memblock_get_region_node(const struct memblock_region *r) 260 { 261 return r->nid; 262 } 263 #else 264 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 265 { 266 } 267 268 static inline int memblock_get_region_node(const struct memblock_region *r) 269 { 270 return 0; 271 } 272 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 273 274 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 275 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 276 277 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align); 278 279 /* 280 * Set the allocation direction to bottom-up or top-down. 281 */ 282 static inline void __init memblock_set_bottom_up(bool enable) 283 { 284 memblock.bottom_up = enable; 285 } 286 287 /* 288 * Check if the allocation direction is bottom-up or not. 289 * if this is true, that said, memblock will allocate memory 290 * in bottom-up direction. 291 */ 292 static inline bool memblock_bottom_up(void) 293 { 294 return memblock.bottom_up; 295 } 296 297 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */ 298 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 299 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 300 301 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align, 302 phys_addr_t start, phys_addr_t end, 303 ulong flags); 304 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 305 phys_addr_t max_addr); 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_phys_mem_size(void); 309 phys_addr_t memblock_reserved_size(void); 310 phys_addr_t memblock_mem_size(unsigned long limit_pfn); 311 phys_addr_t memblock_start_of_DRAM(void); 312 phys_addr_t memblock_end_of_DRAM(void); 313 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 314 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size); 315 void memblock_mem_limit_remove_map(phys_addr_t limit); 316 bool memblock_is_memory(phys_addr_t addr); 317 int memblock_is_map_memory(phys_addr_t addr); 318 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 319 bool memblock_is_reserved(phys_addr_t addr); 320 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 321 322 extern void __memblock_dump_all(void); 323 324 static inline void memblock_dump_all(void) 325 { 326 if (memblock_debug) 327 __memblock_dump_all(); 328 } 329 330 /** 331 * memblock_set_current_limit - Set the current allocation limit to allow 332 * limiting allocations to what is currently 333 * accessible during boot 334 * @limit: New limit value (physical address) 335 */ 336 void memblock_set_current_limit(phys_addr_t limit); 337 338 339 phys_addr_t memblock_get_current_limit(void); 340 341 /* 342 * pfn conversion functions 343 * 344 * While the memory MEMBLOCKs should always be page aligned, the reserved 345 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 346 * idea of what they return for such non aligned MEMBLOCKs. 347 */ 348 349 /** 350 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region 351 * @reg: memblock_region structure 352 */ 353 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 354 { 355 return PFN_UP(reg->base); 356 } 357 358 /** 359 * memblock_region_memory_end_pfn - Return the end_pfn this region 360 * @reg: memblock_region structure 361 */ 362 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 363 { 364 return PFN_DOWN(reg->base + reg->size); 365 } 366 367 /** 368 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region 369 * @reg: memblock_region structure 370 */ 371 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 372 { 373 return PFN_DOWN(reg->base); 374 } 375 376 /** 377 * memblock_region_reserved_end_pfn - Return the end_pfn this region 378 * @reg: memblock_region structure 379 */ 380 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 381 { 382 return PFN_UP(reg->base + reg->size); 383 } 384 385 #define for_each_memblock(memblock_type, region) \ 386 for (region = memblock.memblock_type.regions; \ 387 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 388 region++) 389 390 #define for_each_memblock_type(memblock_type, rgn) \ 391 for (idx = 0, rgn = &memblock_type->regions[0]; \ 392 idx < memblock_type->cnt; \ 393 idx++, rgn = &memblock_type->regions[idx]) 394 395 #ifdef CONFIG_MEMTEST 396 extern void early_memtest(phys_addr_t start, phys_addr_t end); 397 #else 398 static inline void early_memtest(phys_addr_t start, phys_addr_t end) 399 { 400 } 401 #endif 402 403 extern unsigned long memblock_reserved_memory_within(phys_addr_t start_addr, 404 phys_addr_t end_addr); 405 #else 406 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align) 407 { 408 return 0; 409 } 410 411 static inline unsigned long memblock_reserved_memory_within(phys_addr_t start_addr, 412 phys_addr_t end_addr) 413 { 414 return 0; 415 } 416 417 #endif /* CONFIG_HAVE_MEMBLOCK */ 418 419 #endif /* __KERNEL__ */ 420 421 #endif /* _LINUX_MEMBLOCK_H */ 422