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
97extern int try_online_node(int nid);
98
99#ifdef CONFIG_MEMORY_HOTREMOVE
100extern bool is_pageblock_removable_nolock(struct page *page);
101extern int arch_remove_memory(u64 start, u64 size);
102extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
103 unsigned long nr_pages);
104#endif /* CONFIG_MEMORY_HOTREMOVE */
105
106/* reasonably generic interface to expand the physical pages in a zone */
107extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
108 unsigned long nr_pages);
109
110#ifdef CONFIG_NUMA
111extern int memory_add_physaddr_to_nid(u64 start);
112#else
113static inline int memory_add_physaddr_to_nid(u64 start)
114{
115 return 0;
116}
117#endif
118
119#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
120/*
121 * For supporting node-hotadd, we have to allocate a new pgdat.
122 *
123 * If an arch has generic style NODE_DATA(),
124 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
125 *
126 * In general, generic_alloc_nodedata() is used.
127 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
128 *
129 */
130extern pg_data_t *arch_alloc_nodedata(int nid);
131extern void arch_free_nodedata(pg_data_t *pgdat);
132extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
133
134#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
135
136#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
137#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
138
139#ifdef CONFIG_NUMA
140/*
141 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
142 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
143 * Because, pgdat for the new node is not allocated/initialized yet itself.
144 * To use new node's memory, more consideration will be necessary.
145 */
146#define generic_alloc_nodedata(nid) \
147({ \
148 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
149})
150/*
151 * This definition is just for error path in node hotadd.
152 * For node hotremove, we have to replace this.
153 */
154#define generic_free_nodedata(pgdat) kfree(pgdat)
155
156extern pg_data_t *node_data[];
157static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
158{
159 node_data[nid] = pgdat;
160}
161
162#else /* !CONFIG_NUMA */
163
164/* never called */
165static inline pg_data_t *generic_alloc_nodedata(int nid)
166{
167 BUG();
168 return NULL;
169}
170static inline void generic_free_nodedata(pg_data_t *pgdat)
171{
172}
173static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
174{
175}
176#endif /* CONFIG_NUMA */
177#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
178
179#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
180extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
181#else
182static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
183{
184}
185#endif
186extern void put_page_bootmem(struct page *page);
187extern void get_page_bootmem(unsigned long ingo, struct page *page,
188 unsigned long type);
189
190void get_online_mems(void);
191void put_online_mems(void);
192
193#else /* ! CONFIG_MEMORY_HOTPLUG */
194/*
195 * Stub functions for when hotplug is off
196 */
197static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
198static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
199static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
200
201static inline unsigned zone_span_seqbegin(struct zone *zone)
202{
203 return 0;
204}
205static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
206{
207 return 0;
208}
209static inline void zone_span_writelock(struct zone *zone) {}
210static inline void zone_span_writeunlock(struct zone *zone) {}
211static inline void zone_seqlock_init(struct zone *zone) {}
212
213static inline int mhp_notimplemented(const char *func)
214{
215 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
216 dump_stack();
217 return -ENOSYS;
218}
219
220static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
221{
222}
223
224static inline int try_online_node(int nid)
225{
226 return 0;
227}
228
229static inline void get_online_mems(void) {}
230static inline void put_online_mems(void) {}
231
232#endif /* ! CONFIG_MEMORY_HOTPLUG */
233
234#ifdef CONFIG_MEMORY_HOTREMOVE
235
236extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
237extern void try_offline_node(int nid);
238extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
239extern void remove_memory(int nid, u64 start, u64 size);
240
241#else
242static inline int is_mem_section_removable(unsigned long pfn,
243 unsigned long nr_pages)
244{
245 return 0;
246}
247
248static inline void try_offline_node(int nid) {}
249
250static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
251{
252 return -EINVAL;
253}
254
255static inline void remove_memory(int nid, u64 start, u64 size) {}
256#endif /* CONFIG_MEMORY_HOTREMOVE */
257
258extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
259 void *arg, int (*func)(struct memory_block *, void *));
260extern int add_memory(int nid, u64 start, u64 size);
261extern int arch_add_memory(int nid, u64 start, u64 size);
262extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
263extern bool is_memblock_offlined(struct memory_block *mem);
264extern void remove_memory(int nid, u64 start, u64 size);
265extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
266extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
267extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
268 unsigned long pnum);
269
270#endif /* __LINUX_MEMORY_HOTPLUG_H */