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
9 struct page;
10 struct zone;
11 struct pglist_data;
12 struct mem_section;
13 struct memory_block;
14 struct resource;
15
16 #ifdef CONFIG_MEMORY_HOTPLUG
17
18 /*
19 * Types for free bootmem stored in page->lru.next. These have to be in
20 * some random range in unsigned long space for debugging purposes.
21 */
22 enum {
23 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
24 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
25 MIX_SECTION_INFO,
26 NODE_INFO,
27 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
28 };
29
30 /* Types for control the zone type of onlined and offlined memory */
31 enum {
32 MMOP_OFFLINE = -1,
33 MMOP_ONLINE_KEEP,
34 MMOP_ONLINE_KERNEL,
35 MMOP_ONLINE_MOVABLE,
36 };
37
38 /*
39 * pgdat resizing functions
40 */
41 static inline
pgdat_resize_lock(struct pglist_data * pgdat,unsigned long * flags)42 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
43 {
44 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
45 }
46 static inline
pgdat_resize_unlock(struct pglist_data * pgdat,unsigned long * flags)47 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
48 {
49 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
50 }
51 static inline
pgdat_resize_init(struct pglist_data * pgdat)52 void pgdat_resize_init(struct pglist_data *pgdat)
53 {
54 spin_lock_init(&pgdat->node_size_lock);
55 }
56 /*
57 * Zone resizing functions
58 *
59 * Note: any attempt to resize a zone should has pgdat_resize_lock()
60 * zone_span_writelock() both held. This ensure the size of a zone
61 * can't be changed while pgdat_resize_lock() held.
62 */
zone_span_seqbegin(struct zone * zone)63 static inline unsigned zone_span_seqbegin(struct zone *zone)
64 {
65 return read_seqbegin(&zone->span_seqlock);
66 }
zone_span_seqretry(struct zone * zone,unsigned iv)67 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
68 {
69 return read_seqretry(&zone->span_seqlock, iv);
70 }
zone_span_writelock(struct zone * zone)71 static inline void zone_span_writelock(struct zone *zone)
72 {
73 write_seqlock(&zone->span_seqlock);
74 }
zone_span_writeunlock(struct zone * zone)75 static inline void zone_span_writeunlock(struct zone *zone)
76 {
77 write_sequnlock(&zone->span_seqlock);
78 }
zone_seqlock_init(struct zone * zone)79 static inline void zone_seqlock_init(struct zone *zone)
80 {
81 seqlock_init(&zone->span_seqlock);
82 }
83 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
84 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
85 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
86 /* VM interface that may be used by firmware interface */
87 extern int online_pages(unsigned long, unsigned long, int);
88 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
89 unsigned long *valid_start, unsigned long *valid_end);
90 extern void __offline_isolated_pages(unsigned long, unsigned long);
91
92 typedef void (*online_page_callback_t)(struct page *page);
93
94 extern int set_online_page_callback(online_page_callback_t callback);
95 extern int restore_online_page_callback(online_page_callback_t callback);
96
97 extern void __online_page_set_limits(struct page *page);
98 extern void __online_page_increment_counters(struct page *page);
99 extern void __online_page_free(struct page *page);
100
101 extern int try_online_node(int nid);
102
103 #ifdef CONFIG_MEMORY_HOTREMOVE
104 extern bool is_pageblock_removable_nolock(struct page *page);
105 extern int arch_remove_memory(u64 start, u64 size);
106 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
107 unsigned long nr_pages);
108 #endif /* CONFIG_MEMORY_HOTREMOVE */
109
110 /* reasonably generic interface to expand the physical pages in a zone */
111 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
112 unsigned long nr_pages);
113
114 #ifdef CONFIG_NUMA
115 extern int memory_add_physaddr_to_nid(u64 start);
116 #else
memory_add_physaddr_to_nid(u64 start)117 static inline int memory_add_physaddr_to_nid(u64 start)
118 {
119 return 0;
120 }
121 #endif
122
123 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
124 /*
125 * For supporting node-hotadd, we have to allocate a new pgdat.
126 *
127 * If an arch has generic style NODE_DATA(),
128 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
129 *
130 * In general, generic_alloc_nodedata() is used.
131 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
132 *
133 */
134 extern pg_data_t *arch_alloc_nodedata(int nid);
135 extern void arch_free_nodedata(pg_data_t *pgdat);
136 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
137
138 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
139
140 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
141 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
142
143 #ifdef CONFIG_NUMA
144 /*
145 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
146 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
147 * Because, pgdat for the new node is not allocated/initialized yet itself.
148 * To use new node's memory, more consideration will be necessary.
149 */
150 #define generic_alloc_nodedata(nid) \
151 ({ \
152 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
153 })
154 /*
155 * This definition is just for error path in node hotadd.
156 * For node hotremove, we have to replace this.
157 */
158 #define generic_free_nodedata(pgdat) kfree(pgdat)
159
160 extern pg_data_t *node_data[];
arch_refresh_nodedata(int nid,pg_data_t * pgdat)161 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
162 {
163 node_data[nid] = pgdat;
164 }
165
166 #else /* !CONFIG_NUMA */
167
168 /* never called */
generic_alloc_nodedata(int nid)169 static inline pg_data_t *generic_alloc_nodedata(int nid)
170 {
171 BUG();
172 return NULL;
173 }
generic_free_nodedata(pg_data_t * pgdat)174 static inline void generic_free_nodedata(pg_data_t *pgdat)
175 {
176 }
arch_refresh_nodedata(int nid,pg_data_t * pgdat)177 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
178 {
179 }
180 #endif /* CONFIG_NUMA */
181 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
182
183 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
184 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
185 #else
register_page_bootmem_info_node(struct pglist_data * pgdat)186 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
187 {
188 }
189 #endif
190 extern void put_page_bootmem(struct page *page);
191 extern void get_page_bootmem(unsigned long ingo, struct page *page,
192 unsigned long type);
193
194 void get_online_mems(void);
195 void put_online_mems(void);
196
197 void mem_hotplug_begin(void);
198 void mem_hotplug_done(void);
199
200 #else /* ! CONFIG_MEMORY_HOTPLUG */
201 /*
202 * Stub functions for when hotplug is off
203 */
pgdat_resize_lock(struct pglist_data * p,unsigned long * f)204 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
pgdat_resize_unlock(struct pglist_data * p,unsigned long * f)205 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
pgdat_resize_init(struct pglist_data * pgdat)206 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
207
zone_span_seqbegin(struct zone * zone)208 static inline unsigned zone_span_seqbegin(struct zone *zone)
209 {
210 return 0;
211 }
zone_span_seqretry(struct zone * zone,unsigned iv)212 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
213 {
214 return 0;
215 }
zone_span_writelock(struct zone * zone)216 static inline void zone_span_writelock(struct zone *zone) {}
zone_span_writeunlock(struct zone * zone)217 static inline void zone_span_writeunlock(struct zone *zone) {}
zone_seqlock_init(struct zone * zone)218 static inline void zone_seqlock_init(struct zone *zone) {}
219
mhp_notimplemented(const char * func)220 static inline int mhp_notimplemented(const char *func)
221 {
222 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
223 dump_stack();
224 return -ENOSYS;
225 }
226
register_page_bootmem_info_node(struct pglist_data * pgdat)227 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
228 {
229 }
230
try_online_node(int nid)231 static inline int try_online_node(int nid)
232 {
233 return 0;
234 }
235
get_online_mems(void)236 static inline void get_online_mems(void) {}
put_online_mems(void)237 static inline void put_online_mems(void) {}
238
mem_hotplug_begin(void)239 static inline void mem_hotplug_begin(void) {}
mem_hotplug_done(void)240 static inline void mem_hotplug_done(void) {}
241
242 #endif /* ! CONFIG_MEMORY_HOTPLUG */
243
244 #ifdef CONFIG_MEMORY_HOTREMOVE
245
246 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
247 extern void try_offline_node(int nid);
248 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
249 extern void remove_memory(int nid, u64 start, u64 size);
250
251 #else
is_mem_section_removable(unsigned long pfn,unsigned long nr_pages)252 static inline int is_mem_section_removable(unsigned long pfn,
253 unsigned long nr_pages)
254 {
255 return 0;
256 }
257
try_offline_node(int nid)258 static inline void try_offline_node(int nid) {}
259
offline_pages(unsigned long start_pfn,unsigned long nr_pages)260 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
261 {
262 return -EINVAL;
263 }
264
remove_memory(int nid,u64 start,u64 size)265 static inline void remove_memory(int nid, u64 start, u64 size) {}
266 #endif /* CONFIG_MEMORY_HOTREMOVE */
267
268 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
269 void *arg, int (*func)(struct memory_block *, void *));
270 extern int add_memory(int nid, u64 start, u64 size);
271 extern int add_memory_resource(int nid, struct resource *resource);
272 extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
273 bool for_device);
274 extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
275 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
276 extern bool is_memblock_offlined(struct memory_block *mem);
277 extern void remove_memory(int nid, u64 start, u64 size);
278 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
279 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
280 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
281 unsigned long pnum);
282
283 #endif /* __LINUX_MEMORY_HOTPLUG_H */
284