Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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
190/*
191 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
192 * notifier will be called under this. 2) offline/online/add/remove memory
193 * will not run simultaneously.
194 */
195
196void lock_memory_hotplug(void);
197void unlock_memory_hotplug(void);
198
199#else /* ! CONFIG_MEMORY_HOTPLUG */
200/*
201 * Stub functions for when hotplug is off
202 */
203static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
204static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
205static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
206
207static inline unsigned zone_span_seqbegin(struct zone *zone)
208{
209 return 0;
210}
211static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
212{
213 return 0;
214}
215static inline void zone_span_writelock(struct zone *zone) {}
216static inline void zone_span_writeunlock(struct zone *zone) {}
217static inline void zone_seqlock_init(struct zone *zone) {}
218
219static inline int mhp_notimplemented(const char *func)
220{
221 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
222 dump_stack();
223 return -ENOSYS;
224}
225
226static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
227{
228}
229
230static inline int try_online_node(int nid)
231{
232 return 0;
233}
234
235static inline void lock_memory_hotplug(void) {}
236static inline void unlock_memory_hotplug(void) {}
237
238#endif /* ! CONFIG_MEMORY_HOTPLUG */
239
240#ifdef CONFIG_MEMORY_HOTREMOVE
241
242extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
243extern void try_offline_node(int nid);
244extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
245extern void remove_memory(int nid, u64 start, u64 size);
246
247#else
248static inline int is_mem_section_removable(unsigned long pfn,
249 unsigned long nr_pages)
250{
251 return 0;
252}
253
254static inline void try_offline_node(int nid) {}
255
256static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
257{
258 return -EINVAL;
259}
260
261static inline void remove_memory(int nid, u64 start, u64 size) {}
262#endif /* CONFIG_MEMORY_HOTREMOVE */
263
264extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
265 void *arg, int (*func)(struct memory_block *, void *));
266extern int add_memory(int nid, u64 start, u64 size);
267extern int arch_add_memory(int nid, u64 start, u64 size);
268extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
269extern bool is_memblock_offlined(struct memory_block *mem);
270extern void remove_memory(int nid, u64 start, u64 size);
271extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
272extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
273extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
274 unsigned long pnum);
275
276#endif /* __LINUX_MEMORY_HOTPLUG_H */