1 #ifndef __LINUX_MEMORY_HOTPLUG_H
2 #define __LINUX_MEMORY_HOTPLUG_H
3
4 #include <linux/mmzone.h>
5 #include <linux/spinlock.h>
6 #include <linux/notifier.h>
7
8 struct page;
9 struct zone;
10 struct pglist_data;
11
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 {
24 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
25 }
26 static inline
27 void pgdat_resize_init(struct pglist_data *pgdat)
28 {
29 spin_lock_init(&pgdat->node_size_lock);
30 }
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 }
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 */
60 extern int online_pages(unsigned long, unsigned long);
61 extern void __offline_isolated_pages(unsigned long, unsigned long);
62 extern int offline_pages(unsigned long, unsigned long, unsigned long);
63
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);
67
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
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
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 */
96 extern pg_data_t *arch_alloc_nodedata(int nid);
97 extern void arch_free_nodedata(pg_data_t *pgdat);
98 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
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
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
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 }
139 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
140 {
141 }
142 #endif /* CONFIG_NUMA */
143 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
144
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) {}
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) {}
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
172 #endif /* ! CONFIG_MEMORY_HOTPLUG */
173
174 extern int add_memory(int nid, u64 start, u64 size);
175 extern int arch_add_memory(int nid, u64 start, u64 size);
176 extern int remove_memory(u64 start, u64 size);
177 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
178 int nr_pages);
179
180 #endif /* __LINUX_MEMORY_HOTPLUG_H */
181
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