Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...
[deliverable/linux.git] / include / linux / memblock.h
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
22 /* Definition of memblock flags. */
23 #define MEMBLOCK_HOTPLUG 0x1 /* hotpluggable region */
24
25 struct memblock_region {
26 phys_addr_t base;
27 phys_addr_t size;
28 unsigned long flags;
29 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
30 int nid;
31 #endif
32 };
33
34 struct memblock_type {
35 unsigned long cnt; /* number of regions */
36 unsigned long max; /* size of the allocated array */
37 phys_addr_t total_size; /* size of all regions */
38 struct memblock_region *regions;
39 };
40
41 struct memblock {
42 bool bottom_up; /* is bottom up direction? */
43 phys_addr_t current_limit;
44 struct memblock_type memory;
45 struct memblock_type reserved;
46 };
47
48 extern struct memblock memblock;
49 extern int memblock_debug;
50 #ifdef CONFIG_MOVABLE_NODE
51 /* If movable_node boot option specified */
52 extern bool movable_node_enabled;
53 #endif /* CONFIG_MOVABLE_NODE */
54
55 #define memblock_dbg(fmt, ...) \
56 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
57
58 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align,
59 phys_addr_t start, phys_addr_t end,
60 int nid);
61 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
62 phys_addr_t size, phys_addr_t align);
63 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
64 void memblock_allow_resize(void);
65 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
66 int memblock_add(phys_addr_t base, phys_addr_t size);
67 int memblock_remove(phys_addr_t base, phys_addr_t size);
68 int memblock_free(phys_addr_t base, phys_addr_t size);
69 int memblock_reserve(phys_addr_t base, phys_addr_t size);
70 void memblock_trim_memory(phys_addr_t align);
71 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
72 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
73 #ifdef CONFIG_MOVABLE_NODE
74 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
75 {
76 return m->flags & MEMBLOCK_HOTPLUG;
77 }
78
79 static inline bool movable_node_is_enabled(void)
80 {
81 return movable_node_enabled;
82 }
83 #else
84 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
85 {
86 return false;
87 }
88 static inline bool movable_node_is_enabled(void)
89 {
90 return false;
91 }
92 #endif
93
94 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
95 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
96 unsigned long *end_pfn);
97 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
98 unsigned long *out_end_pfn, int *out_nid);
99
100 /**
101 * for_each_mem_pfn_range - early memory pfn range iterator
102 * @i: an integer used as loop variable
103 * @nid: node selector, %MAX_NUMNODES for all nodes
104 * @p_start: ptr to ulong for start pfn of the range, can be %NULL
105 * @p_end: ptr to ulong for end pfn of the range, can be %NULL
106 * @p_nid: ptr to int for nid of the range, can be %NULL
107 *
108 * Walks over configured memory ranges.
109 */
110 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \
111 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
112 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
113 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
114
115 void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start,
116 phys_addr_t *out_end, int *out_nid);
117
118 /**
119 * for_each_free_mem_range - iterate through free memblock areas
120 * @i: u64 used as loop variable
121 * @nid: node selector, %NUMA_NO_NODE for all nodes
122 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
123 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
124 * @p_nid: ptr to int for nid of the range, can be %NULL
125 *
126 * Walks over free (memory && !reserved) areas of memblock. Available as
127 * soon as memblock is initialized.
128 */
129 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid) \
130 for (i = 0, \
131 __next_free_mem_range(&i, nid, p_start, p_end, p_nid); \
132 i != (u64)ULLONG_MAX; \
133 __next_free_mem_range(&i, nid, p_start, p_end, p_nid))
134
135 void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start,
136 phys_addr_t *out_end, int *out_nid);
137
138 /**
139 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
140 * @i: u64 used as loop variable
141 * @nid: node selector, %NUMA_NO_NODE for all nodes
142 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
143 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
144 * @p_nid: ptr to int for nid of the range, can be %NULL
145 *
146 * Walks over free (memory && !reserved) areas of memblock in reverse
147 * order. Available as soon as memblock is initialized.
148 */
149 #define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid) \
150 for (i = (u64)ULLONG_MAX, \
151 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid); \
152 i != (u64)ULLONG_MAX; \
153 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid))
154
155 static inline void memblock_set_region_flags(struct memblock_region *r,
156 unsigned long flags)
157 {
158 r->flags |= flags;
159 }
160
161 static inline void memblock_clear_region_flags(struct memblock_region *r,
162 unsigned long flags)
163 {
164 r->flags &= ~flags;
165 }
166
167 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
168 int memblock_set_node(phys_addr_t base, phys_addr_t size,
169 struct memblock_type *type, int nid);
170
171 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
172 {
173 r->nid = nid;
174 }
175
176 static inline int memblock_get_region_node(const struct memblock_region *r)
177 {
178 return r->nid;
179 }
180 #else
181 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
182 {
183 }
184
185 static inline int memblock_get_region_node(const struct memblock_region *r)
186 {
187 return 0;
188 }
189 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
190
191 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
192 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
193
194 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
195
196 #ifdef CONFIG_MOVABLE_NODE
197 /*
198 * Set the allocation direction to bottom-up or top-down.
199 */
200 static inline void memblock_set_bottom_up(bool enable)
201 {
202 memblock.bottom_up = enable;
203 }
204
205 /*
206 * Check if the allocation direction is bottom-up or not.
207 * if this is true, that said, memblock will allocate memory
208 * in bottom-up direction.
209 */
210 static inline bool memblock_bottom_up(void)
211 {
212 return memblock.bottom_up;
213 }
214 #else
215 static inline void memblock_set_bottom_up(bool enable) {}
216 static inline bool memblock_bottom_up(void) { return false; }
217 #endif
218
219 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
220 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
221 #define MEMBLOCK_ALLOC_ACCESSIBLE 0
222
223 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
224 phys_addr_t max_addr);
225 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
226 phys_addr_t max_addr);
227 phys_addr_t memblock_phys_mem_size(void);
228 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
229 phys_addr_t memblock_start_of_DRAM(void);
230 phys_addr_t memblock_end_of_DRAM(void);
231 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
232 int memblock_is_memory(phys_addr_t addr);
233 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
234 int memblock_is_reserved(phys_addr_t addr);
235 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
236
237 extern void __memblock_dump_all(void);
238
239 static inline void memblock_dump_all(void)
240 {
241 if (memblock_debug)
242 __memblock_dump_all();
243 }
244
245 /**
246 * memblock_set_current_limit - Set the current allocation limit to allow
247 * limiting allocations to what is currently
248 * accessible during boot
249 * @limit: New limit value (physical address)
250 */
251 void memblock_set_current_limit(phys_addr_t limit);
252
253
254 /*
255 * pfn conversion functions
256 *
257 * While the memory MEMBLOCKs should always be page aligned, the reserved
258 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
259 * idea of what they return for such non aligned MEMBLOCKs.
260 */
261
262 /**
263 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
264 * @reg: memblock_region structure
265 */
266 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
267 {
268 return PFN_UP(reg->base);
269 }
270
271 /**
272 * memblock_region_memory_end_pfn - Return the end_pfn this region
273 * @reg: memblock_region structure
274 */
275 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
276 {
277 return PFN_DOWN(reg->base + reg->size);
278 }
279
280 /**
281 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
282 * @reg: memblock_region structure
283 */
284 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
285 {
286 return PFN_DOWN(reg->base);
287 }
288
289 /**
290 * memblock_region_reserved_end_pfn - Return the end_pfn this region
291 * @reg: memblock_region structure
292 */
293 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
294 {
295 return PFN_UP(reg->base + reg->size);
296 }
297
298 #define for_each_memblock(memblock_type, region) \
299 for (region = memblock.memblock_type.regions; \
300 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
301 region++)
302
303
304 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
305 #define __init_memblock __meminit
306 #define __initdata_memblock __meminitdata
307 #else
308 #define __init_memblock
309 #define __initdata_memblock
310 #endif
311
312 #else
313 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
314 {
315 return 0;
316 }
317
318 #endif /* CONFIG_HAVE_MEMBLOCK */
319
320 #endif /* __KERNEL__ */
321
322 #endif /* _LINUX_MEMBLOCK_H */
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