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 * Return page for the valid pfn only if the page is online. All pfn
19 * walkers which rely on the fully initialized page->flags and others
20 * should use this rather than pfn_valid && pfn_to_page
21 */
22#define pfn_to_online_page(pfn) \
23({ \
24 struct page *___page = NULL; \
25 unsigned long ___nr = pfn_to_section_nr(pfn); \
26 \
27 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\
28 ___page = pfn_to_page(pfn); \
29 ___page; \
30})
31
32/*
33 * Types for free bootmem stored in page->lru.next. These have to be in
34 * some random range in unsigned long space for debugging purposes.
35 */
36enum {
37 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
38 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
39 MIX_SECTION_INFO,
40 NODE_INFO,
41 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
42};
43
44/* Types for control the zone type of onlined and offlined memory */
45enum {
46 MMOP_OFFLINE = -1,
47 MMOP_ONLINE_KEEP,
48 MMOP_ONLINE_KERNEL,
49 MMOP_ONLINE_MOVABLE,
50};
51
52/*
53 * pgdat resizing functions
54 */
55static inline
56void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
57{
58 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
59}
60static inline
61void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
62{
63 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
64}
65static inline
66void pgdat_resize_init(struct pglist_data *pgdat)
67{
68 spin_lock_init(&pgdat->node_size_lock);
69}
70/*
71 * Zone resizing functions
72 *
73 * Note: any attempt to resize a zone should has pgdat_resize_lock()
74 * zone_span_writelock() both held. This ensure the size of a zone
75 * can't be changed while pgdat_resize_lock() held.
76 */
77static inline unsigned zone_span_seqbegin(struct zone *zone)
78{
79 return read_seqbegin(&zone->span_seqlock);
80}
81static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
82{
83 return read_seqretry(&zone->span_seqlock, iv);
84}
85static inline void zone_span_writelock(struct zone *zone)
86{
87 write_seqlock(&zone->span_seqlock);
88}
89static inline void zone_span_writeunlock(struct zone *zone)
90{
91 write_sequnlock(&zone->span_seqlock);
92}
93static inline void zone_seqlock_init(struct zone *zone)
94{
95 seqlock_init(&zone->span_seqlock);
96}
97extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
98extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
99extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
100/* VM interface that may be used by firmware interface */
101extern int online_pages(unsigned long, unsigned long, int);
102extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
103 unsigned long *valid_start, unsigned long *valid_end);
104extern void __offline_isolated_pages(unsigned long, unsigned long);
105
106typedef void (*online_page_callback_t)(struct page *page);
107
108extern int set_online_page_callback(online_page_callback_t callback);
109extern int restore_online_page_callback(online_page_callback_t callback);
110
111extern void __online_page_set_limits(struct page *page);
112extern void __online_page_increment_counters(struct page *page);
113extern void __online_page_free(struct page *page);
114
115extern int try_online_node(int nid);
116
117extern bool memhp_auto_online;
118/* If movable_node boot option specified */
119extern bool movable_node_enabled;
120static inline bool movable_node_is_enabled(void)
121{
122 return movable_node_enabled;
123}
124
125#ifdef CONFIG_MEMORY_HOTREMOVE
126extern bool is_pageblock_removable_nolock(struct page *page);
127extern int arch_remove_memory(u64 start, u64 size);
128extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
129 unsigned long nr_pages);
130#endif /* CONFIG_MEMORY_HOTREMOVE */
131
132/* reasonably generic interface to expand the physical pages */
133extern int __add_pages(int nid, unsigned long start_pfn,
134 unsigned long nr_pages, bool want_memblock);
135
136#ifndef CONFIG_ARCH_HAS_ADD_PAGES
137static inline int add_pages(int nid, unsigned long start_pfn,
138 unsigned long nr_pages, bool want_memblock)
139{
140 return __add_pages(nid, start_pfn, nr_pages, want_memblock);
141}
142#else /* ARCH_HAS_ADD_PAGES */
143int add_pages(int nid, unsigned long start_pfn,
144 unsigned long nr_pages, bool want_memblock);
145#endif /* ARCH_HAS_ADD_PAGES */
146
147#ifdef CONFIG_NUMA
148extern int memory_add_physaddr_to_nid(u64 start);
149#else
150static inline int memory_add_physaddr_to_nid(u64 start)
151{
152 return 0;
153}
154#endif
155
156#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
157/*
158 * For supporting node-hotadd, we have to allocate a new pgdat.
159 *
160 * If an arch has generic style NODE_DATA(),
161 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
162 *
163 * In general, generic_alloc_nodedata() is used.
164 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
165 *
166 */
167extern pg_data_t *arch_alloc_nodedata(int nid);
168extern void arch_free_nodedata(pg_data_t *pgdat);
169extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
170
171#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
172
173#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
174#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
175
176#ifdef CONFIG_NUMA
177/*
178 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
179 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
180 * Because, pgdat for the new node is not allocated/initialized yet itself.
181 * To use new node's memory, more consideration will be necessary.
182 */
183#define generic_alloc_nodedata(nid) \
184({ \
185 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
186})
187/*
188 * This definition is just for error path in node hotadd.
189 * For node hotremove, we have to replace this.
190 */
191#define generic_free_nodedata(pgdat) kfree(pgdat)
192
193extern pg_data_t *node_data[];
194static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
195{
196 node_data[nid] = pgdat;
197}
198
199#else /* !CONFIG_NUMA */
200
201/* never called */
202static inline pg_data_t *generic_alloc_nodedata(int nid)
203{
204 BUG();
205 return NULL;
206}
207static inline void generic_free_nodedata(pg_data_t *pgdat)
208{
209}
210static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
211{
212}
213#endif /* CONFIG_NUMA */
214#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
215
216#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
217extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
218#else
219static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
220{
221}
222#endif
223extern void put_page_bootmem(struct page *page);
224extern void get_page_bootmem(unsigned long ingo, struct page *page,
225 unsigned long type);
226
227void get_online_mems(void);
228void put_online_mems(void);
229
230void mem_hotplug_begin(void);
231void mem_hotplug_done(void);
232
233extern void set_zone_contiguous(struct zone *zone);
234extern void clear_zone_contiguous(struct zone *zone);
235
236#else /* ! CONFIG_MEMORY_HOTPLUG */
237#define pfn_to_online_page(pfn) \
238({ \
239 struct page *___page = NULL; \
240 if (pfn_valid(pfn)) \
241 ___page = pfn_to_page(pfn); \
242 ___page; \
243 })
244
245/*
246 * Stub functions for when hotplug is off
247 */
248static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
249static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
250static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
251
252static inline unsigned zone_span_seqbegin(struct zone *zone)
253{
254 return 0;
255}
256static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
257{
258 return 0;
259}
260static inline void zone_span_writelock(struct zone *zone) {}
261static inline void zone_span_writeunlock(struct zone *zone) {}
262static inline void zone_seqlock_init(struct zone *zone) {}
263
264static inline int mhp_notimplemented(const char *func)
265{
266 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
267 dump_stack();
268 return -ENOSYS;
269}
270
271static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
272{
273}
274
275static inline int try_online_node(int nid)
276{
277 return 0;
278}
279
280static inline void get_online_mems(void) {}
281static inline void put_online_mems(void) {}
282
283static inline void mem_hotplug_begin(void) {}
284static inline void mem_hotplug_done(void) {}
285
286static inline bool movable_node_is_enabled(void)
287{
288 return false;
289}
290#endif /* ! CONFIG_MEMORY_HOTPLUG */
291
292#ifdef CONFIG_MEMORY_HOTREMOVE
293
294extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
295extern void try_offline_node(int nid);
296extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
297extern void remove_memory(int nid, u64 start, u64 size);
298
299#else
300static inline bool is_mem_section_removable(unsigned long pfn,
301 unsigned long nr_pages)
302{
303 return false;
304}
305
306static inline void try_offline_node(int nid) {}
307
308static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
309{
310 return -EINVAL;
311}
312
313static inline void remove_memory(int nid, u64 start, u64 size) {}
314#endif /* CONFIG_MEMORY_HOTREMOVE */
315
316extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
317 void *arg, int (*func)(struct memory_block *, void *));
318extern int add_memory(int nid, u64 start, u64 size);
319extern int add_memory_resource(int nid, struct resource *resource, bool online);
320extern int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock);
321extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
322 unsigned long nr_pages);
323extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
324extern bool is_memblock_offlined(struct memory_block *mem);
325extern void remove_memory(int nid, u64 start, u64 size);
326extern int sparse_add_one_section(struct pglist_data *pgdat, unsigned long start_pfn);
327extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
328 unsigned long map_offset);
329extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
330 unsigned long pnum);
331extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
332 int online_type);
333extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
334 unsigned long nr_pages);
335#endif /* __LINUX_MEMORY_HOTPLUG_H */