memory_hotplug.h 8.7 KB
Newer Older
1 2 3 4 5
#ifndef __LINUX_MEMORY_HOTPLUG_H
#define __LINUX_MEMORY_HOTPLUG_H

#include <linux/mmzone.h>
#include <linux/spinlock.h>
6
#include <linux/notifier.h>
7
#include <linux/bug.h>
8

9 10 11
struct page;
struct zone;
struct pglist_data;
12
struct mem_section;
13
struct memory_block;
14
struct resource;
15

16
#ifdef CONFIG_MEMORY_HOTPLUG
17 18

/*
A
Andrea Arcangeli 已提交
19 20
 * Types for free bootmem stored in page->lru.next. These have to be in
 * some random range in unsigned long space for debugging purposes.
21
 */
A
Andrea Arcangeli 已提交
22 23 24 25 26 27 28
enum {
	MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
	SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
	MIX_SECTION_INFO,
	NODE_INFO,
	MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
};
29

30
/* Types for control the zone type of onlined and offlined memory */
31
enum {
32 33 34 35
	MMOP_OFFLINE = -1,
	MMOP_ONLINE_KEEP,
	MMOP_ONLINE_KERNEL,
	MMOP_ONLINE_MOVABLE,
36 37
};

38 39 40 41 42 43 44 45 46 47 48
/*
 * pgdat resizing functions
 */
static inline
void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
{
	spin_lock_irqsave(&pgdat->node_size_lock, *flags);
}
static inline
void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
{
49
	spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
50 51 52 53 54 55
}
static inline
void pgdat_resize_init(struct pglist_data *pgdat)
{
	spin_lock_init(&pgdat->node_size_lock);
}
56 57
/*
 * Zone resizing functions
58 59 60 61
 *
 * Note: any attempt to resize a zone should has pgdat_resize_lock()
 * zone_span_writelock() both held. This ensure the size of a zone
 * can't be changed while pgdat_resize_lock() held.
62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82
 */
static inline unsigned zone_span_seqbegin(struct zone *zone)
{
	return read_seqbegin(&zone->span_seqlock);
}
static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
{
	return read_seqretry(&zone->span_seqlock, iv);
}
static inline void zone_span_writelock(struct zone *zone)
{
	write_seqlock(&zone->span_seqlock);
}
static inline void zone_span_writeunlock(struct zone *zone)
{
	write_sequnlock(&zone->span_seqlock);
}
static inline void zone_seqlock_init(struct zone *zone)
{
	seqlock_init(&zone->span_seqlock);
}
83 84 85 86
extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
/* VM interface that may be used by firmware interface */
87
extern int online_pages(unsigned long, unsigned long, int);
88 89
extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
	unsigned long *valid_start, unsigned long *valid_end);
K
KAMEZAWA Hiroyuki 已提交
90
extern void __offline_isolated_pages(unsigned long, unsigned long);
91

92 93 94 95 96 97 98 99 100
typedef void (*online_page_callback_t)(struct page *page);

extern int set_online_page_callback(online_page_callback_t callback);
extern int restore_online_page_callback(online_page_callback_t callback);

extern void __online_page_set_limits(struct page *page);
extern void __online_page_increment_counters(struct page *page);
extern void __online_page_free(struct page *page);

101 102
extern int try_online_node(int nid);

103 104
extern bool memhp_auto_online;

105 106
#ifdef CONFIG_MEMORY_HOTREMOVE
extern bool is_pageblock_removable_nolock(struct page *page);
107
extern int arch_remove_memory(u64 start, u64 size);
108 109
extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
	unsigned long nr_pages);
110 111
#endif /* CONFIG_MEMORY_HOTREMOVE */

112
/* reasonably generic interface to expand the physical pages in a zone  */
113
extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
114
	unsigned long nr_pages, bool want_memblock);
115 116 117 118 119 120 121 122 123 124

#ifdef CONFIG_NUMA
extern int memory_add_physaddr_to_nid(u64 start);
#else
static inline int memory_add_physaddr_to_nid(u64 start)
{
	return 0;
}
#endif

125 126 127 128 129 130 131 132 133 134 135
#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
/*
 * For supporting node-hotadd, we have to allocate a new pgdat.
 *
 * If an arch has generic style NODE_DATA(),
 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 *
 * In general, generic_alloc_nodedata() is used.
 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 *
 */
136 137
extern pg_data_t *arch_alloc_nodedata(int nid);
extern void arch_free_nodedata(pg_data_t *pgdat);
138
extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161

#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */

#define arch_alloc_nodedata(nid)	generic_alloc_nodedata(nid)
#define arch_free_nodedata(pgdat)	generic_free_nodedata(pgdat)

#ifdef CONFIG_NUMA
/*
 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 *	Because, pgdat for the new node is not allocated/initialized yet itself.
 *	To use new node's memory, more consideration will be necessary.
 */
#define generic_alloc_nodedata(nid)				\
({								\
	kzalloc(sizeof(pg_data_t), GFP_KERNEL);			\
})
/*
 * This definition is just for error path in node hotadd.
 * For node hotremove, we have to replace this.
 */
#define generic_free_nodedata(pgdat)	kfree(pgdat)

162 163 164 165 166 167
extern pg_data_t *node_data[];
static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
{
	node_data[nid] = pgdat;
}

168 169 170 171 172 173 174 175 176 177 178
#else /* !CONFIG_NUMA */

/* never called */
static inline pg_data_t *generic_alloc_nodedata(int nid)
{
	BUG();
	return NULL;
}
static inline void generic_free_nodedata(pg_data_t *pgdat)
{
}
179 180 181
static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
{
}
182 183 184
#endif /* CONFIG_NUMA */
#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */

185
#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
186
extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
187
#else
188 189 190 191
static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
{
}
#endif
192 193 194
extern void put_page_bootmem(struct page *page);
extern void get_page_bootmem(unsigned long ingo, struct page *page,
			     unsigned long type);
195

196 197
void get_online_mems(void);
void put_online_mems(void);
198

199 200 201
void mem_hotplug_begin(void);
void mem_hotplug_done(void);

202 203 204
extern void set_zone_contiguous(struct zone *zone);
extern void clear_zone_contiguous(struct zone *zone);

205 206 207 208 209 210 211
#else /* ! CONFIG_MEMORY_HOTPLUG */
/*
 * Stub functions for when hotplug is off
 */
static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
212 213 214 215 216 217 218 219 220 221 222 223

static inline unsigned zone_span_seqbegin(struct zone *zone)
{
	return 0;
}
static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
{
	return 0;
}
static inline void zone_span_writelock(struct zone *zone) {}
static inline void zone_span_writeunlock(struct zone *zone) {}
static inline void zone_seqlock_init(struct zone *zone) {}
224 225 226 227 228 229 230 231

static inline int mhp_notimplemented(const char *func)
{
	printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
	dump_stack();
	return -ENOSYS;
}

232 233 234 235
static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
{
}

236 237 238 239 240
static inline int try_online_node(int nid)
{
	return 0;
}

241 242
static inline void get_online_mems(void) {}
static inline void put_online_mems(void) {}
243

244 245 246
static inline void mem_hotplug_begin(void) {}
static inline void mem_hotplug_done(void) {}

247
#endif /* ! CONFIG_MEMORY_HOTPLUG */
248

249 250
#ifdef CONFIG_MEMORY_HOTREMOVE

251
extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
252
extern void try_offline_node(int nid);
253 254
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
extern void remove_memory(int nid, u64 start, u64 size);
255 256

#else
257
static inline bool is_mem_section_removable(unsigned long pfn,
258 259
					unsigned long nr_pages)
{
260
	return false;
261
}
262 263

static inline void try_offline_node(int nid) {}
264 265 266 267 268 269 270

static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
{
	return -EINVAL;
}

static inline void remove_memory(int nid, u64 start, u64 size) {}
271 272
#endif /* CONFIG_MEMORY_HOTREMOVE */

273 274
extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
		void *arg, int (*func)(struct memory_block *, void *));
275
extern int add_memory(int nid, u64 start, u64 size);
276
extern int add_memory_resource(int nid, struct resource *resource, bool online);
277 278 279
extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
		bool for_device);
extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
280
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
281
extern bool is_memblock_offlined(struct memory_block *mem);
282
extern void remove_memory(int nid, u64 start, u64 size);
283
extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
284 285
extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
		unsigned long map_offset);
286 287
extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
					  unsigned long pnum);
288 289
extern bool zone_can_shift(unsigned long pfn, unsigned long nr_pages,
			  enum zone_type target, int *zone_shift);
290

291
#endif /* __LINUX_MEMORY_HOTPLUG_H */