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