include/linux/memory_hotplug.h

   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
   9 struct page;
  10 struct zone;
  11 struct pglist_data;
  12 struct mem_section;
  13 struct 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  */
  21 enum {
  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 */
  30 enum {
  31         ONLINE_KEEP,
  32         ONLINE_KERNEL,
  33         ONLINE_MOVABLE,
  34 };
  35
  36 /*
  37  * pgdat resizing functions
  38  */
  39 static inline
  40 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  41 {
  42         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  43 }
  44 static inline
  45 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  46 {
  47         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  48 }
  49 static inline
  50 void 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  */
  61 static inline unsigned zone_span_seqbegin(struct zone *zone)
  62 {
  63         return read_seqbegin(&zone->span_seqlock);
  64 }
  65 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  66 {
  67         return read_seqretry(&zone->span_seqlock, iv);
  68 }
  69 static inline void zone_span_writelock(struct zone *zone)
  70 {
  71         write_seqlock(&zone->span_seqlock);
  72 }
  73 static inline void zone_span_writeunlock(struct zone *zone)
  74 {
  75         write_sequnlock(&zone->span_seqlock);
  76 }
  77 static inline void zone_seqlock_init(struct zone *zone)
  78 {
  79         seqlock_init(&zone->span_seqlock);
  80 }
  81 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  82 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  83 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  84 /* VM interface that may be used by firmware interface */
  85 extern int online_pages(unsigned long, unsigned long, int);
  86 extern void __offline_isolated_pages(unsigned long, unsigned long);
  87
  88 typedef void (*online_page_callback_t)(struct page *page);
  89
  90 extern int set_online_page_callback(online_page_callback_t callback);
  91 extern int restore_online_page_callback(online_page_callback_t callback);
  92
  93 extern void __online_page_set_limits(struct page *page);
  94 extern void __online_page_increment_counters(struct page *page);
  95 extern void __online_page_free(struct page *page);
  96
  97 #ifdef CONFIG_MEMORY_HOTREMOVE
  98 extern bool is_pageblock_removable_nolock(struct page *page);
  99 #endif /* CONFIG_MEMORY_HOTREMOVE */
 100
 101 /* reasonably generic interface to expand the physical pages in a zone  */
 102 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
 103         unsigned long nr_pages);
 104 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
 105         unsigned long nr_pages);
 106
 107 #ifdef CONFIG_NUMA
 108 extern int memory_add_physaddr_to_nid(u64 start);
 109 #else
 110 static inline int memory_add_physaddr_to_nid(u64 start)
 111 {
 112         return 0;
 113 }
 114 #endif
 115
 116 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 117 /*
 118  * For supporting node-hotadd, we have to allocate a new pgdat.
 119  *
 120  * If an arch has generic style NODE_DATA(),
 121  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 122  *
 123  * In general, generic_alloc_nodedata() is used.
 124  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 125  *
 126  */
 127 extern pg_data_t *arch_alloc_nodedata(int nid);
 128 extern void arch_free_nodedata(pg_data_t *pgdat);
 129 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 130
 131 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 132
 133 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 134 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 135
 136 #ifdef CONFIG_NUMA
 137 /*
 138  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 139  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 140  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 141  *      To use new node's memory, more consideration will be necessary.
 142  */
 143 #define generic_alloc_nodedata(nid)                             \
 144 ({                                                              \
 145         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 146 })
 147 /*
 148  * This definition is just for error path in node hotadd.
 149  * For node hotremove, we have to replace this.
 150  */
 151 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 152
 153 extern pg_data_t *node_data[];
 154 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 155 {
 156         node_data[nid] = pgdat;
 157 }
 158
 159 #else /* !CONFIG_NUMA */
 160
 161 /* never called */
 162 static inline pg_data_t *generic_alloc_nodedata(int nid)
 163 {
 164         BUG();
 165         return NULL;
 166 }
 167 static inline void generic_free_nodedata(pg_data_t *pgdat)
 168 {
 169 }
 170 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 171 {
 172 }
 173 #endif /* CONFIG_NUMA */
 174 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 175
 176 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 177 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 178 {
 179 }
 180 static inline void put_page_bootmem(struct page *page)
 181 {
 182 }
 183 #else
 184 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 185 extern void put_page_bootmem(struct page *page);
 186 #endif
 187
 188 /*
 189  * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
 190  * notifier will be called under this. 2) offline/online/add/remove memory
 191  * will not run simultaneously.
 192  */
 193
 194 void lock_memory_hotplug(void);
 195 void unlock_memory_hotplug(void);
 196
 197 #else /* ! CONFIG_MEMORY_HOTPLUG */
 198 /*
 199  * Stub functions for when hotplug is off
 200  */
 201 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 202 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 203 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 204
 205 static inline unsigned zone_span_seqbegin(struct zone *zone)
 206 {
 207         return 0;
 208 }
 209 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 210 {
 211         return 0;
 212 }
 213 static inline void zone_span_writelock(struct zone *zone) {}
 214 static inline void zone_span_writeunlock(struct zone *zone) {}
 215 static inline void zone_seqlock_init(struct zone *zone) {}
 216
 217 static inline int mhp_notimplemented(const char *func)
 218 {
 219         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 220         dump_stack();
 221         return -ENOSYS;
 222 }
 223
 224 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 225 {
 226 }
 227
 228 static inline void lock_memory_hotplug(void) {}
 229 static inline void unlock_memory_hotplug(void) {}
 230
 231 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 232
 233 #ifdef CONFIG_MEMORY_HOTREMOVE
 234
 235 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 236
 237 #else
 238 static inline int is_mem_section_removable(unsigned long pfn,
 239                                         unsigned long nr_pages)
 240 {
 241         return 0;
 242 }
 243 #endif /* CONFIG_MEMORY_HOTREMOVE */
 244
 245 extern int mem_online_node(int nid);
 246 extern int add_memory(int nid, u64 start, u64 size);
 247 extern int arch_add_memory(int nid, u64 start, u64 size);
 248 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 249 extern int offline_memory_block(struct memory_block *mem);
 250 extern int remove_memory(u64 start, u64 size);
 251 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 252                                                                 int nr_pages);
 253 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 254 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 255                                           unsigned long pnum);
 256
 257 #endif /* __LINUX_MEMORY_HOTPLUG_H */