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