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/notifier.h>
7
8struct page;
9struct zone;
10struct pglist_data;
11struct mem_section;
12
13#ifdef CONFIG_MEMORY_HOTPLUG
14
15/*
16 * Types for free bootmem.
17 * The normal smallest mapcount is -1. Here is smaller value than it.
18 */
19#define SECTION_INFO (-1 - 1)
20#define MIX_SECTION_INFO (-1 - 2)
21#define NODE_INFO (-1 - 3)
22
23/*
24 * pgdat resizing functions
25 */
26static inline
27void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
28{
29 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
30}
31static inline
32void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
33{
34 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
35}
36static inline
37void pgdat_resize_init(struct pglist_data *pgdat)
38{
39 spin_lock_init(&pgdat->node_size_lock);
40}
41/*
42 * Zone resizing functions
43 */
44static inline unsigned zone_span_seqbegin(struct zone *zone)
45{
46 return read_seqbegin(&zone->span_seqlock);
47}
48static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
49{
50 return read_seqretry(&zone->span_seqlock, iv);
51}
52static inline void zone_span_writelock(struct zone *zone)
53{
54 write_seqlock(&zone->span_seqlock);
55}
56static inline void zone_span_writeunlock(struct zone *zone)
57{
58 write_sequnlock(&zone->span_seqlock);
59}
60static inline void zone_seqlock_init(struct zone *zone)
61{
62 seqlock_init(&zone->span_seqlock);
63}
64extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
65extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
66extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
67/* need some defines for these for archs that don't support it */
68extern void online_page(struct page *page);
69/* VM interface that may be used by firmware interface */
70extern int online_pages(unsigned long, unsigned long);
71extern void __offline_isolated_pages(unsigned long, unsigned long);
72
73/* reasonably generic interface to expand the physical pages in a zone */
74extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
75 unsigned long nr_pages);
76extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
77 unsigned long nr_pages);
78
79#ifdef CONFIG_NUMA
80extern int memory_add_physaddr_to_nid(u64 start);
81#else
82static inline int memory_add_physaddr_to_nid(u64 start)
83{
84 return 0;
85}
86#endif
87
88#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
89/*
90 * For supporting node-hotadd, we have to allocate a new pgdat.
91 *
92 * If an arch has generic style NODE_DATA(),
93 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
94 *
95 * In general, generic_alloc_nodedata() is used.
96 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
97 *
98 */
99extern pg_data_t *arch_alloc_nodedata(int nid);
100extern void arch_free_nodedata(pg_data_t *pgdat);
101extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
102
103#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
104
105#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
106#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
107
108#ifdef CONFIG_NUMA
109/*
110 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
111 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
112 * Because, pgdat for the new node is not allocated/initialized yet itself.
113 * To use new node's memory, more consideration will be necessary.
114 */
115#define generic_alloc_nodedata(nid) \
116({ \
117 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
118})
119/*
120 * This definition is just for error path in node hotadd.
121 * For node hotremove, we have to replace this.
122 */
123#define generic_free_nodedata(pgdat) kfree(pgdat)
124
125extern pg_data_t *node_data[];
126static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
127{
128 node_data[nid] = pgdat;
129}
130
131#else /* !CONFIG_NUMA */
132
133/* never called */
134static inline pg_data_t *generic_alloc_nodedata(int nid)
135{
136 BUG();
137 return NULL;
138}
139static inline void generic_free_nodedata(pg_data_t *pgdat)
140{
141}
142static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
143{
144}
145#endif /* CONFIG_NUMA */
146#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
147
148#ifdef CONFIG_SPARSEMEM_VMEMMAP
149static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
150{
151}
152static inline void put_page_bootmem(struct page *page)
153{
154}
155#else
156extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
157extern void put_page_bootmem(struct page *page);
158#endif
159
160#else /* ! CONFIG_MEMORY_HOTPLUG */
161/*
162 * Stub functions for when hotplug is off
163 */
164static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
165static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
166static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
167
168static inline unsigned zone_span_seqbegin(struct zone *zone)
169{
170 return 0;
171}
172static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
173{
174 return 0;
175}
176static inline void zone_span_writelock(struct zone *zone) {}
177static inline void zone_span_writeunlock(struct zone *zone) {}
178static inline void zone_seqlock_init(struct zone *zone) {}
179
180static inline int mhp_notimplemented(const char *func)
181{
182 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
183 dump_stack();
184 return -ENOSYS;
185}
186
187static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
188{
189}
190
191#endif /* ! CONFIG_MEMORY_HOTPLUG */
192
193#ifdef CONFIG_MEMORY_HOTREMOVE
194
195extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
196
197#else
198static inline int is_mem_section_removable(unsigned long pfn,
199 unsigned long nr_pages)
200{
201 return 0;
202}
203#endif /* CONFIG_MEMORY_HOTREMOVE */
204
205extern int add_memory(int nid, u64 start, u64 size);
206extern int arch_add_memory(int nid, u64 start, u64 size);
207extern int remove_memory(u64 start, u64 size);
208extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
209 int nr_pages);
210extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
211extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
212 unsigned long pnum);
213
214#endif /* __LINUX_MEMORY_HOTPLUG_H */