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#include <linux/bug.h>
8
9struct page;
10struct zone;
11struct pglist_data;
12struct mem_section;
13struct memory_block;
14
15#ifdef CONFIG_MEMORY_HOTPLUG
16
17/*
18 * Types for free bootmem stored in page->lru.next. These have to be in
19 * some random range in unsigned long space for debugging purposes.
20 */
21enum {
22 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
23 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
24 MIX_SECTION_INFO,
25 NODE_INFO,
26 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
27};
28
29/* Types for control the zone type of onlined memory */
30enum {
31 ONLINE_KEEP,
32 ONLINE_KERNEL,
33 ONLINE_MOVABLE,
34};
35
36/*
37 * pgdat resizing functions
38 */
39static inline
40void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
41{
42 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
43}
44static inline
45void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
46{
47 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
48}
49static inline
50void pgdat_resize_init(struct pglist_data *pgdat)
51{
52 spin_lock_init(&pgdat->node_size_lock);
53}
54/*
55 * Zone resizing functions
56 *
57 * Note: any attempt to resize a zone should has pgdat_resize_lock()
58 * zone_span_writelock() both held. This ensure the size of a zone
59 * can't be changed while pgdat_resize_lock() held.
60 */
61static inline unsigned zone_span_seqbegin(struct zone *zone)
62{
63 return read_seqbegin(&zone->span_seqlock);
64}
65static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
66{
67 return read_seqretry(&zone->span_seqlock, iv);
68}
69static inline void zone_span_writelock(struct zone *zone)
70{
71 write_seqlock(&zone->span_seqlock);
72}
73static inline void zone_span_writeunlock(struct zone *zone)
74{
75 write_sequnlock(&zone->span_seqlock);
76}
77static inline void zone_seqlock_init(struct zone *zone)
78{
79 seqlock_init(&zone->span_seqlock);
80}
81extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
82extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
83extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
84/* VM interface that may be used by firmware interface */
85extern int online_pages(unsigned long, unsigned long, int);
86extern void __offline_isolated_pages(unsigned long, unsigned long);
87
88typedef void (*online_page_callback_t)(struct page *page);
89
90extern int set_online_page_callback(online_page_callback_t callback);
91extern int restore_online_page_callback(online_page_callback_t callback);
92
93extern void __online_page_set_limits(struct page *page);
94extern void __online_page_increment_counters(struct page *page);
95extern void __online_page_free(struct page *page);
96
97#ifdef CONFIG_MEMORY_HOTREMOVE
98extern bool is_pageblock_removable_nolock(struct page *page);
99#endif /* CONFIG_MEMORY_HOTREMOVE */
100
101/* reasonably generic interface to expand the physical pages in a zone */
102extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
103 unsigned long nr_pages);
104extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
105 unsigned long nr_pages);
106
107#ifdef CONFIG_NUMA
108extern int memory_add_physaddr_to_nid(u64 start);
109#else
110static inline int memory_add_physaddr_to_nid(u64 start)
111{
112 return 0;
113}
114#endif
115
116#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
117/*
118 * For supporting node-hotadd, we have to allocate a new pgdat.
119 *
120 * If an arch has generic style NODE_DATA(),
121 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
122 *
123 * In general, generic_alloc_nodedata() is used.
124 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
125 *
126 */
127extern pg_data_t *arch_alloc_nodedata(int nid);
128extern void arch_free_nodedata(pg_data_t *pgdat);
129extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
130
131#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
132
133#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
134#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
135
136#ifdef CONFIG_NUMA
137/*
138 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
139 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
140 * Because, pgdat for the new node is not allocated/initialized yet itself.
141 * To use new node's memory, more consideration will be necessary.
142 */
143#define generic_alloc_nodedata(nid) \
144({ \
145 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
146})
147/*
148 * This definition is just for error path in node hotadd.
149 * For node hotremove, we have to replace this.
150 */
151#define generic_free_nodedata(pgdat) kfree(pgdat)
152
153extern pg_data_t *node_data[];
154static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
155{
156 node_data[nid] = pgdat;
157}
158
159#else /* !CONFIG_NUMA */
160
161/* never called */
162static inline pg_data_t *generic_alloc_nodedata(int nid)
163{
164 BUG();
165 return NULL;
166}
167static inline void generic_free_nodedata(pg_data_t *pgdat)
168{
169}
170static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
171{
172}
173#endif /* CONFIG_NUMA */
174#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
175
176#ifdef CONFIG_SPARSEMEM_VMEMMAP
177static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
178{
179}
180static inline void put_page_bootmem(struct page *page)
181{
182}
183#else
184extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
185extern void put_page_bootmem(struct page *page);
186#endif
187
188/*
189 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
190 * notifier will be called under this. 2) offline/online/add/remove memory
191 * will not run simultaneously.
192 */
193
194void lock_memory_hotplug(void);
195void unlock_memory_hotplug(void);
196
197#else /* ! CONFIG_MEMORY_HOTPLUG */
198/*
199 * Stub functions for when hotplug is off
200 */
201static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
202static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
203static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
204
205static inline unsigned zone_span_seqbegin(struct zone *zone)
206{
207 return 0;
208}
209static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
210{
211 return 0;
212}
213static inline void zone_span_writelock(struct zone *zone) {}
214static inline void zone_span_writeunlock(struct zone *zone) {}
215static inline void zone_seqlock_init(struct zone *zone) {}
216
217static inline int mhp_notimplemented(const char *func)
218{
219 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
220 dump_stack();
221 return -ENOSYS;
222}
223
224static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
225{
226}
227
228static inline void lock_memory_hotplug(void) {}
229static inline void unlock_memory_hotplug(void) {}
230
231#endif /* ! CONFIG_MEMORY_HOTPLUG */
232
233#ifdef CONFIG_MEMORY_HOTREMOVE
234
235extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
236
237#else
238static inline int is_mem_section_removable(unsigned long pfn,
239 unsigned long nr_pages)
240{
241 return 0;
242}
243#endif /* CONFIG_MEMORY_HOTREMOVE */
244
245extern int mem_online_node(int nid);
246extern int add_memory(int nid, u64 start, u64 size);
247extern int arch_add_memory(int nid, u64 start, u64 size);
248extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
249extern int offline_memory_block(struct memory_block *mem);
250extern int remove_memory(u64 start, u64 size);
251extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
252 int nr_pages);
253extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
254extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
255 unsigned long pnum);
256
257#endif /* __LINUX_MEMORY_HOTPLUG_H */