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;
14struct 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 */
22enum {
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 */
31enum {
32 MMOP_OFFLINE = -1,
33 MMOP_ONLINE_KEEP,
34 MMOP_ONLINE_KERNEL,
35 MMOP_ONLINE_MOVABLE,
36};
37
38/*
39 * pgdat resizing functions
40 */
41static inline
42void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
43{
44 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
45}
46static inline
47void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
48{
49 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
50}
51static inline
52void 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 */
63static inline unsigned zone_span_seqbegin(struct zone *zone)
64{
65 return read_seqbegin(&zone->span_seqlock);
66}
67static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
68{
69 return read_seqretry(&zone->span_seqlock, iv);
70}
71static inline void zone_span_writelock(struct zone *zone)
72{
73 write_seqlock(&zone->span_seqlock);
74}
75static inline void zone_span_writeunlock(struct zone *zone)
76{
77 write_sequnlock(&zone->span_seqlock);
78}
79static inline void zone_seqlock_init(struct zone *zone)
80{
81 seqlock_init(&zone->span_seqlock);
82}
83extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
84extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
85extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
86/* VM interface that may be used by firmware interface */
87extern int online_pages(unsigned long, unsigned long, int);
88extern int test_pages_in_a_zone(unsigned long, unsigned long);
89extern void __offline_isolated_pages(unsigned long, unsigned long);
90
91typedef void (*online_page_callback_t)(struct page *page);
92
93extern int set_online_page_callback(online_page_callback_t callback);
94extern int restore_online_page_callback(online_page_callback_t callback);
95
96extern void __online_page_set_limits(struct page *page);
97extern void __online_page_increment_counters(struct page *page);
98extern void __online_page_free(struct page *page);
99
100extern int try_online_node(int nid);
101
102extern bool memhp_auto_online;
103
104#ifdef CONFIG_MEMORY_HOTREMOVE
105extern bool is_pageblock_removable_nolock(struct page *page);
106extern int arch_remove_memory(u64 start, u64 size);
107extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
108 unsigned long nr_pages);
109#endif /* CONFIG_MEMORY_HOTREMOVE */
110
111/* reasonably generic interface to expand the physical pages in a zone */
112extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
113 unsigned long nr_pages);
114
115#ifdef CONFIG_NUMA
116extern int memory_add_physaddr_to_nid(u64 start);
117#else
118static inline int memory_add_physaddr_to_nid(u64 start)
119{
120 return 0;
121}
122#endif
123
124#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
125/*
126 * For supporting node-hotadd, we have to allocate a new pgdat.
127 *
128 * If an arch has generic style NODE_DATA(),
129 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
130 *
131 * In general, generic_alloc_nodedata() is used.
132 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
133 *
134 */
135extern pg_data_t *arch_alloc_nodedata(int nid);
136extern void arch_free_nodedata(pg_data_t *pgdat);
137extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
138
139#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
140
141#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
142#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
143
144#ifdef CONFIG_NUMA
145/*
146 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
147 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
148 * Because, pgdat for the new node is not allocated/initialized yet itself.
149 * To use new node's memory, more consideration will be necessary.
150 */
151#define generic_alloc_nodedata(nid) \
152({ \
153 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
154})
155/*
156 * This definition is just for error path in node hotadd.
157 * For node hotremove, we have to replace this.
158 */
159#define generic_free_nodedata(pgdat) kfree(pgdat)
160
161extern pg_data_t *node_data[];
162static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
163{
164 node_data[nid] = pgdat;
165}
166
167#else /* !CONFIG_NUMA */
168
169/* never called */
170static inline pg_data_t *generic_alloc_nodedata(int nid)
171{
172 BUG();
173 return NULL;
174}
175static inline void generic_free_nodedata(pg_data_t *pgdat)
176{
177}
178static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
179{
180}
181#endif /* CONFIG_NUMA */
182#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
183
184#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
185extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
186#else
187static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
188{
189}
190#endif
191extern void put_page_bootmem(struct page *page);
192extern void get_page_bootmem(unsigned long ingo, struct page *page,
193 unsigned long type);
194
195void get_online_mems(void);
196void put_online_mems(void);
197
198void mem_hotplug_begin(void);
199void mem_hotplug_done(void);
200
201extern void set_zone_contiguous(struct zone *zone);
202extern void clear_zone_contiguous(struct zone *zone);
203
204#else /* ! CONFIG_MEMORY_HOTPLUG */
205/*
206 * Stub functions for when hotplug is off
207 */
208static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
209static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
210static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
211
212static inline unsigned zone_span_seqbegin(struct zone *zone)
213{
214 return 0;
215}
216static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
217{
218 return 0;
219}
220static inline void zone_span_writelock(struct zone *zone) {}
221static inline void zone_span_writeunlock(struct zone *zone) {}
222static inline void zone_seqlock_init(struct zone *zone) {}
223
224static inline int mhp_notimplemented(const char *func)
225{
226 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
227 dump_stack();
228 return -ENOSYS;
229}
230
231static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
232{
233}
234
235static inline int try_online_node(int nid)
236{
237 return 0;
238}
239
240static inline void get_online_mems(void) {}
241static inline void put_online_mems(void) {}
242
243static inline void mem_hotplug_begin(void) {}
244static inline void mem_hotplug_done(void) {}
245
246#endif /* ! CONFIG_MEMORY_HOTPLUG */
247
248#ifdef CONFIG_MEMORY_HOTREMOVE
249
250extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
251extern void try_offline_node(int nid);
252extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
253extern void remove_memory(int nid, u64 start, u64 size);
254
255#else
256static inline bool is_mem_section_removable(unsigned long pfn,
257 unsigned long nr_pages)
258{
259 return false;
260}
261
262static inline void try_offline_node(int nid) {}
263
264static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
265{
266 return -EINVAL;
267}
268
269static inline void remove_memory(int nid, u64 start, u64 size) {}
270#endif /* CONFIG_MEMORY_HOTREMOVE */
271
272extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
273 void *arg, int (*func)(struct memory_block *, void *));
274extern int add_memory(int nid, u64 start, u64 size);
275extern int add_memory_resource(int nid, struct resource *resource, bool online);
276extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
277 bool for_device);
278extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
279extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
280extern bool is_memblock_offlined(struct memory_block *mem);
281extern void remove_memory(int nid, u64 start, u64 size);
282extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
283extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
284 unsigned long map_offset);
285extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
286 unsigned long pnum);
287extern int zone_can_shift(unsigned long pfn, unsigned long nr_pages,
288 enum zone_type target);
289
290#endif /* __LINUX_MEMORY_HOTPLUG_H */