Linux kernel mirror (for testing)
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linux
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/mmzone.h>
7#include <linux/notifier.h>
8
9struct page;
10struct zone;
11struct pglist_data;
12
13#ifdef CONFIG_MEMORY_HOTPLUG
14/*
15 * pgdat resizing functions
16 */
17static inline
18void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
19{
20 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
21}
22static inline
23void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
24{
25 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
26}
27static inline
28void pgdat_resize_init(struct pglist_data *pgdat)
29{
30 spin_lock_init(&pgdat->node_size_lock);
31}
32/*
33 * Zone resizing functions
34 */
35static inline unsigned zone_span_seqbegin(struct zone *zone)
36{
37 return read_seqbegin(&zone->span_seqlock);
38}
39static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
40{
41 return read_seqretry(&zone->span_seqlock, iv);
42}
43static inline void zone_span_writelock(struct zone *zone)
44{
45 write_seqlock(&zone->span_seqlock);
46}
47static inline void zone_span_writeunlock(struct zone *zone)
48{
49 write_sequnlock(&zone->span_seqlock);
50}
51static inline void zone_seqlock_init(struct zone *zone)
52{
53 seqlock_init(&zone->span_seqlock);
54}
55extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
56extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
57extern 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 */
59extern void online_page(struct page *page);
60/* VM interface that may be used by firmware interface */
61extern int online_pages(unsigned long, unsigned long);
62
63/* reasonably generic interface to expand the physical pages in a zone */
64extern int __add_pages(struct zone *zone, unsigned long start_pfn,
65 unsigned long nr_pages);
66
67#ifdef CONFIG_NUMA
68extern int memory_add_physaddr_to_nid(u64 start);
69#else
70static inline int memory_add_physaddr_to_nid(u64 start)
71{
72 return 0;
73}
74#endif
75
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 */
87extern pg_data_t *arch_alloc_nodedata(int nid);
88extern void arch_free_nodedata(pg_data_t *pgdat);
89extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
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
113extern pg_data_t *node_data[];
114static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
115{
116 node_data[nid] = pgdat;
117}
118
119#else /* !CONFIG_NUMA */
120
121/* never called */
122static inline pg_data_t *generic_alloc_nodedata(int nid)
123{
124 BUG();
125 return NULL;
126}
127static inline void generic_free_nodedata(pg_data_t *pgdat)
128{
129}
130static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
131{
132}
133#endif /* CONFIG_NUMA */
134#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
135
136#else /* ! CONFIG_MEMORY_HOTPLUG */
137/*
138 * Stub functions for when hotplug is off
139 */
140static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
141static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
142static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
143
144static inline unsigned zone_span_seqbegin(struct zone *zone)
145{
146 return 0;
147}
148static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
149{
150 return 0;
151}
152static inline void zone_span_writelock(struct zone *zone) {}
153static inline void zone_span_writeunlock(struct zone *zone) {}
154static inline void zone_seqlock_init(struct zone *zone) {}
155
156static 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
163#endif /* ! CONFIG_MEMORY_HOTPLUG */
164static 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}
171
172extern int add_memory(int nid, u64 start, u64 size);
173extern int arch_add_memory(int nid, u64 start, u64 size);
174extern int remove_memory(u64 start, u64 size);
175extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
176 int nr_pages);
177
178#endif /* __LINUX_MEMORY_HOTPLUG_H */