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 struct memblock_region {
23 phys_addr_t base;
24 phys_addr_t size;
25 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
26 int nid;
27 #endif
28 };
29
30 struct memblock_type {
31 unsigned long cnt; /* number of regions */
32 unsigned long max; /* size of the allocated array */
33 phys_addr_t total_size; /* size of all regions */
34 struct memblock_region *regions;
35 };
36
37 struct memblock {
38 phys_addr_t current_limit;
39 struct memblock_type memory;
40 struct memblock_type reserved;
41 };
42
43 extern struct memblock memblock;
44 extern int memblock_debug;
45
46 #define memblock_dbg(fmt, ...) \
47 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
48
49 phys_addr_t memblock_find_in_range_node(phys_addr_t start, phys_addr_t end,
50 phys_addr_t size, phys_addr_t align, int nid);
51 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
52 phys_addr_t size, phys_addr_t align);
53 int memblock_free_reserved_regions(void);
54 int memblock_reserve_reserved_regions(void);
55
56 void memblock_allow_resize(void);
57 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
58 int memblock_add(phys_addr_t base, phys_addr_t size);
59 int memblock_remove(phys_addr_t base, phys_addr_t size);
60 int memblock_free(phys_addr_t base, phys_addr_t size);
61 int memblock_reserve(phys_addr_t base, phys_addr_t size);
62
63 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
64 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
65 unsigned long *out_end_pfn, int *out_nid);
66
67 /**
68 * for_each_mem_pfn_range - early memory pfn range iterator
69 * @i: an integer used as loop variable
70 * @nid: node selector, %MAX_NUMNODES for all nodes
71 * @p_start: ptr to ulong for start pfn of the range, can be %NULL
72 * @p_end: ptr to ulong for end pfn of the range, can be %NULL
73 * @p_nid: ptr to int for nid of the range, can be %NULL
74 *
75 * Walks over configured memory ranges. Available after early_node_map is
76 * populated.
77 */
78 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \
79 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
80 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
81 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
82
83 void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start,
84 phys_addr_t *out_end, int *out_nid);
85
86 /**
87 * for_each_free_mem_range - iterate through free memblock areas
88 * @i: u64 used as loop variable
89 * @nid: node selector, %MAX_NUMNODES for all nodes
90 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
91 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
92 * @p_nid: ptr to int for nid of the range, can be %NULL
93 *
94 * Walks over free (memory && !reserved) areas of memblock. Available as
95 * soon as memblock is initialized.
96 */
97 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid) \
98 for (i = 0, \
99 __next_free_mem_range(&i, nid, p_start, p_end, p_nid); \
100 i != (u64)ULLONG_MAX; \
101 __next_free_mem_range(&i, nid, p_start, p_end, p_nid))
102
103 void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start,
104 phys_addr_t *out_end, int *out_nid);
105
106 /**
107 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
108 * @i: u64 used as loop variable
109 * @nid: node selector, %MAX_NUMNODES for all nodes
110 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
111 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
112 * @p_nid: ptr to int for nid of the range, can be %NULL
113 *
114 * Walks over free (memory && !reserved) areas of memblock in reverse
115 * order. Available as soon as memblock is initialized.
116 */
117 #define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid) \
118 for (i = (u64)ULLONG_MAX, \
119 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid); \
120 i != (u64)ULLONG_MAX; \
121 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid))
122
123 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
124 int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid);
125
memblock_set_region_node(struct memblock_region * r,int nid)126 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
127 {
128 r->nid = nid;
129 }
130
memblock_get_region_node(const struct memblock_region * r)131 static inline int memblock_get_region_node(const struct memblock_region *r)
132 {
133 return r->nid;
134 }
135 #else
memblock_set_region_node(struct memblock_region * r,int nid)136 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
137 {
138 }
139
memblock_get_region_node(const struct memblock_region * r)140 static inline int memblock_get_region_node(const struct memblock_region *r)
141 {
142 return 0;
143 }
144 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
145
146 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
147 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
148
149 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
150
151 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
152 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
153 #define MEMBLOCK_ALLOC_ACCESSIBLE 0
154
155 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
156 phys_addr_t max_addr);
157 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
158 phys_addr_t max_addr);
159 phys_addr_t memblock_phys_mem_size(void);
160 phys_addr_t memblock_start_of_DRAM(void);
161 phys_addr_t memblock_end_of_DRAM(void);
162 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
163 int memblock_is_memory(phys_addr_t addr);
164 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
165 int memblock_is_reserved(phys_addr_t addr);
166 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
167
168 extern void __memblock_dump_all(void);
169
memblock_dump_all(void)170 static inline void memblock_dump_all(void)
171 {
172 if (memblock_debug)
173 __memblock_dump_all();
174 }
175
176 /**
177 * memblock_set_current_limit - Set the current allocation limit to allow
178 * limiting allocations to what is currently
179 * accessible during boot
180 * @limit: New limit value (physical address)
181 */
182 void memblock_set_current_limit(phys_addr_t limit);
183
184
185 /*
186 * pfn conversion functions
187 *
188 * While the memory MEMBLOCKs should always be page aligned, the reserved
189 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
190 * idea of what they return for such non aligned MEMBLOCKs.
191 */
192
193 /**
194 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
195 * @reg: memblock_region structure
196 */
memblock_region_memory_base_pfn(const struct memblock_region * reg)197 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
198 {
199 return PFN_UP(reg->base);
200 }
201
202 /**
203 * memblock_region_memory_end_pfn - Return the end_pfn this region
204 * @reg: memblock_region structure
205 */
memblock_region_memory_end_pfn(const struct memblock_region * reg)206 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
207 {
208 return PFN_DOWN(reg->base + reg->size);
209 }
210
211 /**
212 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
213 * @reg: memblock_region structure
214 */
memblock_region_reserved_base_pfn(const struct memblock_region * reg)215 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
216 {
217 return PFN_DOWN(reg->base);
218 }
219
220 /**
221 * memblock_region_reserved_end_pfn - Return the end_pfn this region
222 * @reg: memblock_region structure
223 */
memblock_region_reserved_end_pfn(const struct memblock_region * reg)224 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
225 {
226 return PFN_UP(reg->base + reg->size);
227 }
228
229 #define for_each_memblock(memblock_type, region) \
230 for (region = memblock.memblock_type.regions; \
231 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
232 region++)
233
234
235 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
236 #define __init_memblock __meminit
237 #define __initdata_memblock __meminitdata
238 #else
239 #define __init_memblock
240 #define __initdata_memblock
241 #endif
242
243 #else
memblock_alloc(phys_addr_t size,phys_addr_t align)244 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
245 {
246 return 0;
247 }
248
249 #endif /* CONFIG_HAVE_MEMBLOCK */
250
251 #endif /* __KERNEL__ */
252
253 #endif /* _LINUX_MEMBLOCK_H */
254