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