memblock: Add memblock_find_in_range()
[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 #include <asm/memblock.h>
21
22 #define INIT_MEMBLOCK_REGIONS 128
23 #define MEMBLOCK_ERROR 0
24
25 struct memblock_region {
26 phys_addr_t base;
27 phys_addr_t size;
28 };
29
30 struct memblock_type {
31 unsigned long cnt; /* number of regions */
32 unsigned long max; /* size of the allocated array */
33 struct memblock_region *regions;
34 };
35
36 struct memblock {
37 phys_addr_t current_limit;
38 phys_addr_t memory_size; /* Updated by memblock_analyze() */
39 struct memblock_type memory;
40 struct memblock_type reserved;
41 };
42
43 extern struct memblock memblock;
44 extern int memblock_debug;
45 extern int memblock_can_resize;
46
47 #define memblock_dbg(fmt, ...) \
48 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
49
50 u64 memblock_find_in_range(u64 start, u64 end, u64 size, u64 align);
51
52 extern void __init memblock_init(void);
53 extern void __init memblock_analyze(void);
54 extern long memblock_add(phys_addr_t base, phys_addr_t size);
55 extern long memblock_remove(phys_addr_t base, phys_addr_t size);
56 extern long __init memblock_free(phys_addr_t base, phys_addr_t size);
57 extern long __init memblock_reserve(phys_addr_t base, phys_addr_t size);
58
59 /* The numa aware allocator is only available if
60 * CONFIG_ARCH_POPULATES_NODE_MAP is set
61 */
62 extern phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
63 int nid);
64 extern phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
65 int nid);
66
67 extern phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align);
68
69 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
70 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
71 #define MEMBLOCK_ALLOC_ACCESSIBLE 0
72
73 extern phys_addr_t __init memblock_alloc_base(phys_addr_t size,
74 phys_addr_t align,
75 phys_addr_t max_addr);
76 extern phys_addr_t __init __memblock_alloc_base(phys_addr_t size,
77 phys_addr_t align,
78 phys_addr_t max_addr);
79 extern phys_addr_t __init memblock_phys_mem_size(void);
80 extern phys_addr_t memblock_end_of_DRAM(void);
81 extern void __init memblock_enforce_memory_limit(phys_addr_t memory_limit);
82 extern int memblock_is_memory(phys_addr_t addr);
83 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
84 extern int __init memblock_is_reserved(phys_addr_t addr);
85 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
86
87 extern void memblock_dump_all(void);
88
89 /* Provided by the architecture */
90 extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
91 extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
92 phys_addr_t addr2, phys_addr_t size2);
93
94 /**
95 * memblock_set_current_limit - Set the current allocation limit to allow
96 * limiting allocations to what is currently
97 * accessible during boot
98 * @limit: New limit value (physical address)
99 */
100 extern void memblock_set_current_limit(phys_addr_t limit);
101
102
103 /*
104 * pfn conversion functions
105 *
106 * While the memory MEMBLOCKs should always be page aligned, the reserved
107 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
108 * idea of what they return for such non aligned MEMBLOCKs.
109 */
110
111 /**
112 * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
113 * @reg: memblock_region structure
114 */
115 static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
116 {
117 return reg->base >> PAGE_SHIFT;
118 }
119
120 /**
121 * memblock_region_last_pfn - Return the highest pfn intersecting with the region
122 * @reg: memblock_region structure
123 */
124 static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
125 {
126 return (reg->base + reg->size - 1) >> PAGE_SHIFT;
127 }
128
129 /**
130 * memblock_region_end_pfn - Return the pfn of the first page following the region
131 * but not intersecting it
132 * @reg: memblock_region structure
133 */
134 static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
135 {
136 return memblock_region_last_pfn(reg) + 1;
137 }
138
139 /**
140 * memblock_region_pages - Return the number of pages covering a region
141 * @reg: memblock_region structure
142 */
143 static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
144 {
145 return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
146 }
147
148 #define for_each_memblock(memblock_type, region) \
149 for (region = memblock.memblock_type.regions; \
150 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
151 region++)
152
153
154 #ifdef ARCH_DISCARD_MEMBLOCK
155 #define __init_memblock __init
156 #define __initdata_memblock __initdata
157 #else
158 #define __init_memblock
159 #define __initdata_memblock
160 #endif
161
162 #endif /* CONFIG_HAVE_MEMBLOCK */
163
164 #endif /* __KERNEL__ */
165
166 #endif /* _LINUX_MEMBLOCK_H */
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