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