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