1 #ifndef _LINUX_MEMBLOCK_H
2 #define _LINUX_MEMBLOCK_H
6 * Logical memory blocks.
8 * Copyright (C) 2001 Peter Bergner, IBM Corp.
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <linux/init.h>
20 extern unsigned long max_low_pfn;
21 extern unsigned long min_low_pfn;
26 extern unsigned long max_pfn;
28 * highest possible page
30 extern unsigned long long max_possible_pfn;
32 #define INIT_MEMBLOCK_REGIONS 128
33 #define INIT_PHYSMEM_REGIONS 4
36 * enum memblock_flags - definition of memory region attributes
37 * @MEMBLOCK_NONE: no special request
38 * @MEMBLOCK_HOTPLUG: hotpluggable region
39 * @MEMBLOCK_MIRROR: mirrored region
40 * @MEMBLOCK_NOMAP: don't add to kernel direct mapping
43 MEMBLOCK_NONE = 0x0, /* No special request */
44 MEMBLOCK_HOTPLUG = 0x1, /* hotpluggable region */
45 MEMBLOCK_MIRROR = 0x2, /* mirrored region */
46 MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */
50 * struct memblock_region - represents a memory region
51 * @base: physical address of the region
52 * @size: size of the region
53 * @flags: memory region attributes
56 struct memblock_region {
59 enum memblock_flags flags;
60 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
66 * struct memblock_type - collection of memory regions of certain type
67 * @cnt: number of regions
68 * @max: size of the allocated array
69 * @total_size: size of all regions
70 * @regions: array of regions
71 * @name: the memory type symbolic name
73 struct memblock_type {
76 phys_addr_t total_size;
77 struct memblock_region *regions;
82 * struct memblock - memblock allocator metadata
83 * @bottom_up: is bottom up direction?
84 * @current_limit: physical address of the current allocation limit
85 * @memory: usabe memory regions
86 * @reserved: reserved memory regions
87 * @physmem: all physical memory
90 bool bottom_up; /* is bottom up direction? */
91 phys_addr_t current_limit;
92 struct memblock_type memory;
93 struct memblock_type reserved;
94 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
95 struct memblock_type physmem;
99 extern struct memblock memblock;
100 extern int memblock_debug;
102 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
103 #define __init_memblock __meminit
104 #define __initdata_memblock __meminitdata
105 void memblock_discard(void);
107 #define __init_memblock
108 #define __initdata_memblock
111 #define memblock_dbg(fmt, ...) \
112 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
114 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align,
115 phys_addr_t start, phys_addr_t end,
116 int nid, enum memblock_flags flags);
117 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
118 phys_addr_t size, phys_addr_t align);
119 void memblock_allow_resize(void);
120 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
121 int memblock_add(phys_addr_t base, phys_addr_t size);
122 int memblock_remove(phys_addr_t base, phys_addr_t size);
123 int memblock_free(phys_addr_t base, phys_addr_t size);
124 int memblock_reserve(phys_addr_t base, phys_addr_t size);
125 void memblock_trim_memory(phys_addr_t align);
126 bool memblock_overlaps_region(struct memblock_type *type,
127 phys_addr_t base, phys_addr_t size);
128 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
129 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
130 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
131 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
132 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
133 enum memblock_flags choose_memblock_flags(void);
135 unsigned long memblock_free_all(void);
136 void reset_node_managed_pages(pg_data_t *pgdat);
137 void reset_all_zones_managed_pages(void);
139 /* Low level functions */
140 int memblock_add_range(struct memblock_type *type,
141 phys_addr_t base, phys_addr_t size,
142 int nid, enum memblock_flags flags);
144 void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags,
145 struct memblock_type *type_a,
146 struct memblock_type *type_b, phys_addr_t *out_start,
147 phys_addr_t *out_end, int *out_nid);
149 void __next_mem_range_rev(u64 *idx, int nid, enum memblock_flags flags,
150 struct memblock_type *type_a,
151 struct memblock_type *type_b, phys_addr_t *out_start,
152 phys_addr_t *out_end, int *out_nid);
154 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start,
155 phys_addr_t *out_end);
157 void __memblock_free_early(phys_addr_t base, phys_addr_t size);
158 void __memblock_free_late(phys_addr_t base, phys_addr_t size);
161 * for_each_mem_range - iterate through memblock areas from type_a and not
162 * included in type_b. Or just type_a if type_b is NULL.
163 * @i: u64 used as loop variable
164 * @type_a: ptr to memblock_type to iterate
165 * @type_b: ptr to memblock_type which excludes from the iteration
166 * @nid: node selector, %NUMA_NO_NODE for all nodes
167 * @flags: pick from blocks based on memory attributes
168 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
169 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
170 * @p_nid: ptr to int for nid of the range, can be %NULL
172 #define for_each_mem_range(i, type_a, type_b, nid, flags, \
173 p_start, p_end, p_nid) \
174 for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \
175 p_start, p_end, p_nid); \
176 i != (u64)ULLONG_MAX; \
177 __next_mem_range(&i, nid, flags, type_a, type_b, \
178 p_start, p_end, p_nid))
181 * for_each_mem_range_rev - reverse iterate through memblock areas from
182 * type_a and not included in type_b. Or just type_a if type_b is NULL.
183 * @i: u64 used as loop variable
184 * @type_a: ptr to memblock_type to iterate
185 * @type_b: ptr to memblock_type which excludes from the iteration
186 * @nid: node selector, %NUMA_NO_NODE for all nodes
187 * @flags: pick from blocks based on memory attributes
188 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
189 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
190 * @p_nid: ptr to int for nid of the range, can be %NULL
192 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags, \
193 p_start, p_end, p_nid) \
194 for (i = (u64)ULLONG_MAX, \
195 __next_mem_range_rev(&i, nid, flags, type_a, type_b,\
196 p_start, p_end, p_nid); \
197 i != (u64)ULLONG_MAX; \
198 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \
199 p_start, p_end, p_nid))
202 * for_each_reserved_mem_region - iterate over all reserved memblock areas
203 * @i: u64 used as loop variable
204 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
205 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
207 * Walks over reserved areas of memblock. Available as soon as memblock
210 #define for_each_reserved_mem_region(i, p_start, p_end) \
211 for (i = 0UL, __next_reserved_mem_region(&i, p_start, p_end); \
212 i != (u64)ULLONG_MAX; \
213 __next_reserved_mem_region(&i, p_start, p_end))
215 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
217 return m->flags & MEMBLOCK_HOTPLUG;
220 static inline bool memblock_is_mirror(struct memblock_region *m)
222 return m->flags & MEMBLOCK_MIRROR;
225 static inline bool memblock_is_nomap(struct memblock_region *m)
227 return m->flags & MEMBLOCK_NOMAP;
230 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
231 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
232 unsigned long *end_pfn);
233 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
234 unsigned long *out_end_pfn, int *out_nid);
237 * for_each_mem_pfn_range - early memory pfn range iterator
238 * @i: an integer used as loop variable
239 * @nid: node selector, %MAX_NUMNODES for all nodes
240 * @p_start: ptr to ulong for start pfn of the range, can be %NULL
241 * @p_end: ptr to ulong for end pfn of the range, can be %NULL
242 * @p_nid: ptr to int for nid of the range, can be %NULL
244 * Walks over configured memory ranges.
246 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \
247 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
248 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
249 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
252 * for_each_free_mem_range - iterate through free memblock areas
253 * @i: u64 used as loop variable
254 * @nid: node selector, %NUMA_NO_NODE for all nodes
255 * @flags: pick from blocks based on memory attributes
256 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
257 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
258 * @p_nid: ptr to int for nid of the range, can be %NULL
260 * Walks over free (memory && !reserved) areas of memblock. Available as
261 * soon as memblock is initialized.
263 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \
264 for_each_mem_range(i, &memblock.memory, &memblock.reserved, \
265 nid, flags, p_start, p_end, p_nid)
268 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
269 * @i: u64 used as loop variable
270 * @nid: node selector, %NUMA_NO_NODE for all nodes
271 * @flags: pick from blocks based on memory attributes
272 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
273 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
274 * @p_nid: ptr to int for nid of the range, can be %NULL
276 * Walks over free (memory && !reserved) areas of memblock in reverse
277 * order. Available as soon as memblock is initialized.
279 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \
281 for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
282 nid, flags, p_start, p_end, p_nid)
284 static inline void memblock_set_region_flags(struct memblock_region *r,
285 enum memblock_flags flags)
290 static inline void memblock_clear_region_flags(struct memblock_region *r,
291 enum memblock_flags flags)
296 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
297 int memblock_set_node(phys_addr_t base, phys_addr_t size,
298 struct memblock_type *type, int nid);
300 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
305 static inline int memblock_get_region_node(const struct memblock_region *r)
310 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
314 static inline int memblock_get_region_node(const struct memblock_region *r)
318 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
320 /* Flags for memblock allocation APIs */
321 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
322 #define MEMBLOCK_ALLOC_ACCESSIBLE 0
324 /* We are using top down, so it is safe to use 0 here */
325 #define MEMBLOCK_LOW_LIMIT 0
327 #ifndef ARCH_LOW_ADDRESS_LIMIT
328 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
331 phys_addr_t memblock_phys_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
332 phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
334 phys_addr_t memblock_phys_alloc(phys_addr_t size, phys_addr_t align);
336 void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align,
337 phys_addr_t min_addr, phys_addr_t max_addr,
339 void *memblock_alloc_try_nid_nopanic(phys_addr_t size, phys_addr_t align,
340 phys_addr_t min_addr, phys_addr_t max_addr,
342 void *memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
343 phys_addr_t min_addr, phys_addr_t max_addr,
346 static inline void * __init memblock_alloc(phys_addr_t size, phys_addr_t align)
348 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
349 MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
352 static inline void * __init memblock_alloc_raw(phys_addr_t size,
355 return memblock_alloc_try_nid_raw(size, align, MEMBLOCK_LOW_LIMIT,
356 MEMBLOCK_ALLOC_ACCESSIBLE,
360 static inline void * __init memblock_alloc_from(phys_addr_t size,
362 phys_addr_t min_addr)
364 return memblock_alloc_try_nid(size, align, min_addr,
365 MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
368 static inline void * __init memblock_alloc_nopanic(phys_addr_t size,
371 return memblock_alloc_try_nid_nopanic(size, align, MEMBLOCK_LOW_LIMIT,
372 MEMBLOCK_ALLOC_ACCESSIBLE,
376 static inline void * __init memblock_alloc_low(phys_addr_t size,
379 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
380 ARCH_LOW_ADDRESS_LIMIT, NUMA_NO_NODE);
382 static inline void * __init memblock_alloc_low_nopanic(phys_addr_t size,
385 return memblock_alloc_try_nid_nopanic(size, align, MEMBLOCK_LOW_LIMIT,
386 ARCH_LOW_ADDRESS_LIMIT,
390 static inline void * __init memblock_alloc_from_nopanic(phys_addr_t size,
392 phys_addr_t min_addr)
394 return memblock_alloc_try_nid_nopanic(size, align, min_addr,
395 MEMBLOCK_ALLOC_ACCESSIBLE,
399 static inline void * __init memblock_alloc_node(phys_addr_t size,
400 phys_addr_t align, int nid)
402 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
403 MEMBLOCK_ALLOC_ACCESSIBLE, nid);
406 static inline void * __init memblock_alloc_node_nopanic(phys_addr_t size,
409 return memblock_alloc_try_nid_nopanic(size, SMP_CACHE_BYTES,
411 MEMBLOCK_ALLOC_ACCESSIBLE, nid);
414 static inline void __init memblock_free_early(phys_addr_t base,
417 __memblock_free_early(base, size);
420 static inline void __init memblock_free_early_nid(phys_addr_t base,
421 phys_addr_t size, int nid)
423 __memblock_free_early(base, size);
426 static inline void __init memblock_free_late(phys_addr_t base, phys_addr_t size)
428 __memblock_free_late(base, size);
432 * Set the allocation direction to bottom-up or top-down.
434 static inline void __init memblock_set_bottom_up(bool enable)
436 memblock.bottom_up = enable;
440 * Check if the allocation direction is bottom-up or not.
441 * if this is true, that said, memblock will allocate memory
442 * in bottom-up direction.
444 static inline bool memblock_bottom_up(void)
446 return memblock.bottom_up;
449 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
450 phys_addr_t start, phys_addr_t end,
451 enum memblock_flags flags);
452 phys_addr_t memblock_alloc_base_nid(phys_addr_t size,
453 phys_addr_t align, phys_addr_t max_addr,
454 int nid, enum memblock_flags flags);
455 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
456 phys_addr_t max_addr);
457 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
458 phys_addr_t max_addr);
459 phys_addr_t memblock_phys_mem_size(void);
460 phys_addr_t memblock_reserved_size(void);
461 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
462 phys_addr_t memblock_start_of_DRAM(void);
463 phys_addr_t memblock_end_of_DRAM(void);
464 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
465 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
466 void memblock_mem_limit_remove_map(phys_addr_t limit);
467 bool memblock_is_memory(phys_addr_t addr);
468 bool memblock_is_map_memory(phys_addr_t addr);
469 bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
470 bool memblock_is_reserved(phys_addr_t addr);
471 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
473 extern void __memblock_dump_all(void);
475 static inline void memblock_dump_all(void)
478 __memblock_dump_all();
482 * memblock_set_current_limit - Set the current allocation limit to allow
483 * limiting allocations to what is currently
484 * accessible during boot
485 * @limit: New limit value (physical address)
487 void memblock_set_current_limit(phys_addr_t limit);
490 phys_addr_t memblock_get_current_limit(void);
493 * pfn conversion functions
495 * While the memory MEMBLOCKs should always be page aligned, the reserved
496 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
497 * idea of what they return for such non aligned MEMBLOCKs.
501 * memblock_region_memory_base_pfn - get the lowest pfn of the memory region
502 * @reg: memblock_region structure
504 * Return: the lowest pfn intersecting with the memory region
506 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
508 return PFN_UP(reg->base);
512 * memblock_region_memory_end_pfn - get the end pfn of the memory region
513 * @reg: memblock_region structure
515 * Return: the end_pfn of the reserved region
517 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
519 return PFN_DOWN(reg->base + reg->size);
523 * memblock_region_reserved_base_pfn - get the lowest pfn of the reserved region
524 * @reg: memblock_region structure
526 * Return: the lowest pfn intersecting with the reserved region
528 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
530 return PFN_DOWN(reg->base);
534 * memblock_region_reserved_end_pfn - get the end pfn of the reserved region
535 * @reg: memblock_region structure
537 * Return: the end_pfn of the reserved region
539 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
541 return PFN_UP(reg->base + reg->size);
544 #define for_each_memblock(memblock_type, region) \
545 for (region = memblock.memblock_type.regions; \
546 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
549 #define for_each_memblock_type(i, memblock_type, rgn) \
550 for (i = 0, rgn = &memblock_type->regions[0]; \
551 i < memblock_type->cnt; \
552 i++, rgn = &memblock_type->regions[i])
554 extern void *alloc_large_system_hash(const char *tablename,
555 unsigned long bucketsize,
556 unsigned long numentries,
559 unsigned int *_hash_shift,
560 unsigned int *_hash_mask,
561 unsigned long low_limit,
562 unsigned long high_limit);
564 #define HASH_EARLY 0x00000001 /* Allocating during early boot? */
565 #define HASH_SMALL 0x00000002 /* sub-page allocation allowed, min
566 * shift passed via *_hash_shift */
567 #define HASH_ZERO 0x00000004 /* Zero allocated hash table */
569 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
570 * sufficient vmalloc space.
573 #define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT)
574 extern int hashdist; /* Distribute hashes across NUMA nodes? */
579 #ifdef CONFIG_MEMTEST
580 extern void early_memtest(phys_addr_t start, phys_addr_t end);
582 static inline void early_memtest(phys_addr_t start, phys_addr_t end)
587 #endif /* __KERNEL__ */
589 #endif /* _LINUX_MEMBLOCK_H */