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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> |
187f1882 | 7 | #include <linux/bug.h> |
208d54e5 | 8 | |
78679302 KH |
9 | struct page; |
10 | struct zone; | |
11 | struct pglist_data; | |
ea01ea93 | 12 | struct mem_section; |
e90bdb7f | 13 | struct memory_block; |
78679302 | 14 | |
208d54e5 | 15 | #ifdef CONFIG_MEMORY_HOTPLUG |
04753278 YG |
16 | |
17 | /* | |
5f24ce5f AA |
18 | * Types for free bootmem stored in page->lru.next. These have to be in |
19 | * some random range in unsigned long space for debugging purposes. | |
04753278 | 20 | */ |
5f24ce5f AA |
21 | enum { |
22 | MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, | |
23 | SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, | |
24 | MIX_SECTION_INFO, | |
25 | NODE_INFO, | |
26 | MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, | |
27 | }; | |
04753278 | 28 | |
511c2aba LJ |
29 | /* Types for control the zone type of onlined memory */ |
30 | enum { | |
31 | ONLINE_KEEP, | |
32 | ONLINE_KERNEL, | |
33 | ONLINE_MOVABLE, | |
34 | }; | |
35 | ||
208d54e5 DH |
36 | /* |
37 | * pgdat resizing functions | |
38 | */ | |
39 | static inline | |
40 | void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) | |
41 | { | |
42 | spin_lock_irqsave(&pgdat->node_size_lock, *flags); | |
43 | } | |
44 | static inline | |
45 | void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) | |
46 | { | |
bdc8cb98 | 47 | spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); |
208d54e5 DH |
48 | } |
49 | static inline | |
50 | void pgdat_resize_init(struct pglist_data *pgdat) | |
51 | { | |
52 | spin_lock_init(&pgdat->node_size_lock); | |
53 | } | |
bdc8cb98 DH |
54 | /* |
55 | * Zone resizing functions | |
511c2aba LJ |
56 | * |
57 | * Note: any attempt to resize a zone should has pgdat_resize_lock() | |
58 | * zone_span_writelock() both held. This ensure the size of a zone | |
59 | * can't be changed while pgdat_resize_lock() held. | |
bdc8cb98 DH |
60 | */ |
61 | static inline unsigned zone_span_seqbegin(struct zone *zone) | |
62 | { | |
63 | return read_seqbegin(&zone->span_seqlock); | |
64 | } | |
65 | static inline int zone_span_seqretry(struct zone *zone, unsigned iv) | |
66 | { | |
67 | return read_seqretry(&zone->span_seqlock, iv); | |
68 | } | |
69 | static inline void zone_span_writelock(struct zone *zone) | |
70 | { | |
71 | write_seqlock(&zone->span_seqlock); | |
72 | } | |
73 | static inline void zone_span_writeunlock(struct zone *zone) | |
74 | { | |
75 | write_sequnlock(&zone->span_seqlock); | |
76 | } | |
77 | static inline void zone_seqlock_init(struct zone *zone) | |
78 | { | |
79 | seqlock_init(&zone->span_seqlock); | |
80 | } | |
3947be19 DH |
81 | extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); |
82 | extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); | |
83 | extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); | |
3947be19 | 84 | /* VM interface that may be used by firmware interface */ |
511c2aba | 85 | extern int online_pages(unsigned long, unsigned long, int); |
0c0e6195 | 86 | extern void __offline_isolated_pages(unsigned long, unsigned long); |
48e94196 | 87 | |
9d0ad8ca DK |
88 | typedef void (*online_page_callback_t)(struct page *page); |
89 | ||
90 | extern int set_online_page_callback(online_page_callback_t callback); | |
91 | extern int restore_online_page_callback(online_page_callback_t callback); | |
92 | ||
93 | extern void __online_page_set_limits(struct page *page); | |
94 | extern void __online_page_increment_counters(struct page *page); | |
95 | extern void __online_page_free(struct page *page); | |
96 | ||
49ac8255 KH |
97 | #ifdef CONFIG_MEMORY_HOTREMOVE |
98 | extern bool is_pageblock_removable_nolock(struct page *page); | |
24d335ca | 99 | extern int arch_remove_memory(u64 start, u64 size); |
4edd7cef DR |
100 | extern int __remove_pages(struct zone *zone, unsigned long start_pfn, |
101 | unsigned long nr_pages); | |
49ac8255 KH |
102 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
103 | ||
3947be19 | 104 | /* reasonably generic interface to expand the physical pages in a zone */ |
c04fc586 | 105 | extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, |
3947be19 | 106 | unsigned long nr_pages); |
bc02af93 YG |
107 | |
108 | #ifdef CONFIG_NUMA | |
109 | extern int memory_add_physaddr_to_nid(u64 start); | |
110 | #else | |
111 | static inline int memory_add_physaddr_to_nid(u64 start) | |
112 | { | |
113 | return 0; | |
114 | } | |
115 | #endif | |
116 | ||
306d6cbe YG |
117 | #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION |
118 | /* | |
119 | * For supporting node-hotadd, we have to allocate a new pgdat. | |
120 | * | |
121 | * If an arch has generic style NODE_DATA(), | |
122 | * node_data[nid] = kzalloc() works well. But it depends on the architecture. | |
123 | * | |
124 | * In general, generic_alloc_nodedata() is used. | |
125 | * Now, arch_free_nodedata() is just defined for error path of node_hot_add. | |
126 | * | |
127 | */ | |
dd0932d9 YG |
128 | extern pg_data_t *arch_alloc_nodedata(int nid); |
129 | extern void arch_free_nodedata(pg_data_t *pgdat); | |
7049027c | 130 | extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); |
306d6cbe YG |
131 | |
132 | #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ | |
133 | ||
134 | #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) | |
135 | #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) | |
136 | ||
137 | #ifdef CONFIG_NUMA | |
138 | /* | |
139 | * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. | |
140 | * XXX: kmalloc_node() can't work well to get new node's memory at this time. | |
141 | * Because, pgdat for the new node is not allocated/initialized yet itself. | |
142 | * To use new node's memory, more consideration will be necessary. | |
143 | */ | |
144 | #define generic_alloc_nodedata(nid) \ | |
145 | ({ \ | |
146 | kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ | |
147 | }) | |
148 | /* | |
149 | * This definition is just for error path in node hotadd. | |
150 | * For node hotremove, we have to replace this. | |
151 | */ | |
152 | #define generic_free_nodedata(pgdat) kfree(pgdat) | |
153 | ||
10ad400b YG |
154 | extern pg_data_t *node_data[]; |
155 | static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) | |
156 | { | |
157 | node_data[nid] = pgdat; | |
158 | } | |
159 | ||
306d6cbe YG |
160 | #else /* !CONFIG_NUMA */ |
161 | ||
162 | /* never called */ | |
163 | static inline pg_data_t *generic_alloc_nodedata(int nid) | |
164 | { | |
165 | BUG(); | |
166 | return NULL; | |
167 | } | |
168 | static inline void generic_free_nodedata(pg_data_t *pgdat) | |
169 | { | |
170 | } | |
10ad400b YG |
171 | static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) |
172 | { | |
173 | } | |
306d6cbe YG |
174 | #endif /* CONFIG_NUMA */ |
175 | #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ | |
176 | ||
46723bfa YI |
177 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
178 | extern void register_page_bootmem_info_node(struct pglist_data *pgdat); | |
179 | #else | |
04753278 YG |
180 | static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) |
181 | { | |
182 | } | |
04753278 | 183 | #endif |
46723bfa YI |
184 | extern void put_page_bootmem(struct page *page); |
185 | extern void get_page_bootmem(unsigned long ingo, struct page *page, | |
186 | unsigned long type); | |
04753278 | 187 | |
925268a0 KH |
188 | /* |
189 | * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug | |
190 | * notifier will be called under this. 2) offline/online/add/remove memory | |
191 | * will not run simultaneously. | |
192 | */ | |
193 | ||
20d6c96b KM |
194 | void lock_memory_hotplug(void); |
195 | void unlock_memory_hotplug(void); | |
196 | ||
208d54e5 DH |
197 | #else /* ! CONFIG_MEMORY_HOTPLUG */ |
198 | /* | |
199 | * Stub functions for when hotplug is off | |
200 | */ | |
201 | static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} | |
202 | static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} | |
203 | static inline void pgdat_resize_init(struct pglist_data *pgdat) {} | |
bdc8cb98 DH |
204 | |
205 | static inline unsigned zone_span_seqbegin(struct zone *zone) | |
206 | { | |
207 | return 0; | |
208 | } | |
209 | static inline int zone_span_seqretry(struct zone *zone, unsigned iv) | |
210 | { | |
211 | return 0; | |
212 | } | |
213 | static inline void zone_span_writelock(struct zone *zone) {} | |
214 | static inline void zone_span_writeunlock(struct zone *zone) {} | |
215 | static inline void zone_seqlock_init(struct zone *zone) {} | |
3947be19 DH |
216 | |
217 | static inline int mhp_notimplemented(const char *func) | |
218 | { | |
219 | printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); | |
220 | dump_stack(); | |
221 | return -ENOSYS; | |
222 | } | |
223 | ||
04753278 YG |
224 | static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) |
225 | { | |
226 | } | |
227 | ||
20d6c96b KM |
228 | static inline void lock_memory_hotplug(void) {} |
229 | static inline void unlock_memory_hotplug(void) {} | |
230 | ||
bdc8cb98 | 231 | #endif /* ! CONFIG_MEMORY_HOTPLUG */ |
9d99aaa3 | 232 | |
5c755e9f BP |
233 | #ifdef CONFIG_MEMORY_HOTREMOVE |
234 | ||
235 | extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); | |
90b30cdc | 236 | extern void try_offline_node(int nid); |
5c755e9f BP |
237 | |
238 | #else | |
239 | static inline int is_mem_section_removable(unsigned long pfn, | |
240 | unsigned long nr_pages) | |
241 | { | |
242 | return 0; | |
243 | } | |
90b30cdc WC |
244 | |
245 | static inline void try_offline_node(int nid) {} | |
5c755e9f BP |
246 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
247 | ||
cf23422b | 248 | extern int mem_online_node(int nid); |
bc02af93 YG |
249 | extern int add_memory(int nid, u64 start, u64 size); |
250 | extern int arch_add_memory(int nid, u64 start, u64 size); | |
a16cee10 | 251 | extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); |
e90bdb7f | 252 | extern int offline_memory_block(struct memory_block *mem); |
6677e3ea | 253 | extern bool is_memblock_offlined(struct memory_block *mem); |
60a5a19e | 254 | extern int remove_memory(int nid, u64 start, u64 size); |
f28c5edc KM |
255 | extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, |
256 | int nr_pages); | |
ea01ea93 | 257 | extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); |
04753278 YG |
258 | extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, |
259 | unsigned long pnum); | |
9d99aaa3 | 260 | |
208d54e5 | 261 | #endif /* __LINUX_MEMORY_HOTPLUG_H */ |