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