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208d54e5 DH |
1 | #ifndef __LINUX_MEMORY_HOTPLUG_H |
2 | #define __LINUX_MEMORY_HOTPLUG_H | |
3 | ||
4 | #include <linux/mmzone.h> | |
5 | #include <linux/spinlock.h> | |
3947be19 | 6 | #include <linux/notifier.h> |
208d54e5 | 7 | |
78679302 KH |
8 | struct page; |
9 | struct zone; | |
10 | struct pglist_data; | |
ea01ea93 | 11 | struct mem_section; |
78679302 | 12 | |
208d54e5 | 13 | #ifdef CONFIG_MEMORY_HOTPLUG |
04753278 YG |
14 | |
15 | /* | |
16 | * Magic number for free bootmem. | |
17 | * The normal smallest mapcount is -1. Here is smaller value than it. | |
18 | */ | |
19 | #define SECTION_INFO 0xfffffffe | |
20 | #define MIX_INFO 0xfffffffd | |
21 | #define NODE_INFO 0xfffffffc | |
22 | ||
208d54e5 DH |
23 | /* |
24 | * pgdat resizing functions | |
25 | */ | |
26 | static inline | |
27 | void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) | |
28 | { | |
29 | spin_lock_irqsave(&pgdat->node_size_lock, *flags); | |
30 | } | |
31 | static inline | |
32 | void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) | |
33 | { | |
bdc8cb98 | 34 | spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); |
208d54e5 DH |
35 | } |
36 | static inline | |
37 | void pgdat_resize_init(struct pglist_data *pgdat) | |
38 | { | |
39 | spin_lock_init(&pgdat->node_size_lock); | |
40 | } | |
bdc8cb98 DH |
41 | /* |
42 | * Zone resizing functions | |
43 | */ | |
44 | static inline unsigned zone_span_seqbegin(struct zone *zone) | |
45 | { | |
46 | return read_seqbegin(&zone->span_seqlock); | |
47 | } | |
48 | static inline int zone_span_seqretry(struct zone *zone, unsigned iv) | |
49 | { | |
50 | return read_seqretry(&zone->span_seqlock, iv); | |
51 | } | |
52 | static inline void zone_span_writelock(struct zone *zone) | |
53 | { | |
54 | write_seqlock(&zone->span_seqlock); | |
55 | } | |
56 | static inline void zone_span_writeunlock(struct zone *zone) | |
57 | { | |
58 | write_sequnlock(&zone->span_seqlock); | |
59 | } | |
60 | static inline void zone_seqlock_init(struct zone *zone) | |
61 | { | |
62 | seqlock_init(&zone->span_seqlock); | |
63 | } | |
3947be19 DH |
64 | extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); |
65 | extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); | |
66 | extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); | |
67 | /* need some defines for these for archs that don't support it */ | |
68 | extern void online_page(struct page *page); | |
69 | /* VM interface that may be used by firmware interface */ | |
3947be19 | 70 | extern int online_pages(unsigned long, unsigned long); |
0c0e6195 | 71 | extern void __offline_isolated_pages(unsigned long, unsigned long); |
48e94196 KH |
72 | extern int offline_pages(unsigned long, unsigned long, unsigned long); |
73 | ||
3947be19 DH |
74 | /* reasonably generic interface to expand the physical pages in a zone */ |
75 | extern int __add_pages(struct zone *zone, unsigned long start_pfn, | |
76 | unsigned long nr_pages); | |
ea01ea93 BP |
77 | extern int __remove_pages(struct zone *zone, unsigned long start_pfn, |
78 | unsigned long nr_pages); | |
bc02af93 | 79 | |
75884fb1 | 80 | /* |
ea01ea93 | 81 | * Walk through all memory which is registered as resource. |
75884fb1 KH |
82 | * arg is (start_pfn, nr_pages, private_arg_pointer) |
83 | */ | |
84 | extern int walk_memory_resource(unsigned long start_pfn, | |
85 | unsigned long nr_pages, void *arg, | |
86 | int (*func)(unsigned long, unsigned long, void *)); | |
87 | ||
bc02af93 YG |
88 | #ifdef CONFIG_NUMA |
89 | extern int memory_add_physaddr_to_nid(u64 start); | |
90 | #else | |
91 | static inline int memory_add_physaddr_to_nid(u64 start) | |
92 | { | |
93 | return 0; | |
94 | } | |
95 | #endif | |
96 | ||
306d6cbe YG |
97 | #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION |
98 | /* | |
99 | * For supporting node-hotadd, we have to allocate a new pgdat. | |
100 | * | |
101 | * If an arch has generic style NODE_DATA(), | |
102 | * node_data[nid] = kzalloc() works well. But it depends on the architecture. | |
103 | * | |
104 | * In general, generic_alloc_nodedata() is used. | |
105 | * Now, arch_free_nodedata() is just defined for error path of node_hot_add. | |
106 | * | |
107 | */ | |
dd0932d9 YG |
108 | extern pg_data_t *arch_alloc_nodedata(int nid); |
109 | extern void arch_free_nodedata(pg_data_t *pgdat); | |
7049027c | 110 | extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); |
306d6cbe YG |
111 | |
112 | #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ | |
113 | ||
114 | #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) | |
115 | #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) | |
116 | ||
117 | #ifdef CONFIG_NUMA | |
118 | /* | |
119 | * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. | |
120 | * XXX: kmalloc_node() can't work well to get new node's memory at this time. | |
121 | * Because, pgdat for the new node is not allocated/initialized yet itself. | |
122 | * To use new node's memory, more consideration will be necessary. | |
123 | */ | |
124 | #define generic_alloc_nodedata(nid) \ | |
125 | ({ \ | |
126 | kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ | |
127 | }) | |
128 | /* | |
129 | * This definition is just for error path in node hotadd. | |
130 | * For node hotremove, we have to replace this. | |
131 | */ | |
132 | #define generic_free_nodedata(pgdat) kfree(pgdat) | |
133 | ||
10ad400b YG |
134 | extern pg_data_t *node_data[]; |
135 | static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) | |
136 | { | |
137 | node_data[nid] = pgdat; | |
138 | } | |
139 | ||
306d6cbe YG |
140 | #else /* !CONFIG_NUMA */ |
141 | ||
142 | /* never called */ | |
143 | static inline pg_data_t *generic_alloc_nodedata(int nid) | |
144 | { | |
145 | BUG(); | |
146 | return NULL; | |
147 | } | |
148 | static inline void generic_free_nodedata(pg_data_t *pgdat) | |
149 | { | |
150 | } | |
10ad400b YG |
151 | static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) |
152 | { | |
153 | } | |
306d6cbe YG |
154 | #endif /* CONFIG_NUMA */ |
155 | #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ | |
156 | ||
04753278 YG |
157 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
158 | static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) | |
159 | { | |
160 | } | |
161 | static inline void put_page_bootmem(struct page *page) | |
162 | { | |
163 | } | |
164 | #else | |
165 | extern void register_page_bootmem_info_node(struct pglist_data *pgdat); | |
166 | extern void put_page_bootmem(struct page *page); | |
167 | #endif | |
168 | ||
208d54e5 DH |
169 | #else /* ! CONFIG_MEMORY_HOTPLUG */ |
170 | /* | |
171 | * Stub functions for when hotplug is off | |
172 | */ | |
173 | static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} | |
174 | static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} | |
175 | static inline void pgdat_resize_init(struct pglist_data *pgdat) {} | |
bdc8cb98 DH |
176 | |
177 | static inline unsigned zone_span_seqbegin(struct zone *zone) | |
178 | { | |
179 | return 0; | |
180 | } | |
181 | static inline int zone_span_seqretry(struct zone *zone, unsigned iv) | |
182 | { | |
183 | return 0; | |
184 | } | |
185 | static inline void zone_span_writelock(struct zone *zone) {} | |
186 | static inline void zone_span_writeunlock(struct zone *zone) {} | |
187 | static inline void zone_seqlock_init(struct zone *zone) {} | |
3947be19 DH |
188 | |
189 | static inline int mhp_notimplemented(const char *func) | |
190 | { | |
191 | printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); | |
192 | dump_stack(); | |
193 | return -ENOSYS; | |
194 | } | |
195 | ||
04753278 YG |
196 | static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) |
197 | { | |
198 | } | |
199 | ||
bdc8cb98 | 200 | #endif /* ! CONFIG_MEMORY_HOTPLUG */ |
9d99aaa3 | 201 | |
bc02af93 YG |
202 | extern int add_memory(int nid, u64 start, u64 size); |
203 | extern int arch_add_memory(int nid, u64 start, u64 size); | |
9d99aaa3 | 204 | extern int remove_memory(u64 start, u64 size); |
f28c5edc KM |
205 | extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, |
206 | int nr_pages); | |
ea01ea93 | 207 | extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); |
04753278 YG |
208 | extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, |
209 | unsigned long pnum); | |
9d99aaa3 | 210 | |
208d54e5 | 211 | #endif /* __LINUX_MEMORY_HOTPLUG_H */ |