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 extern int try_online_node(int nid);
  98
  99 #ifdef CONFIG_MEMORY_HOTREMOVE
 100 extern bool is_pageblock_removable_nolock(struct page *page);
 101 extern int arch_remove_memory(u64 start, u64 size);
 102 extern 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  */
 107 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
 108         unsigned long nr_pages);
 109
 110 #ifdef CONFIG_NUMA
 111 extern int memory_add_physaddr_to_nid(u64 start);
 112 #else
 113 static 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  */
 130 extern pg_data_t *arch_alloc_nodedata(int nid);
 131 extern void arch_free_nodedata(pg_data_t *pgdat);
 132 extern 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
 156 extern pg_data_t *node_data[];
 157 static 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 */
 165 static inline pg_data_t *generic_alloc_nodedata(int nid)
 166 {
 167         BUG();
 168         return NULL;
 169 }
 170 static inline void generic_free_nodedata(pg_data_t *pgdat)
 171 {
 172 }
 173 static 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
 180 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 181 #else
 182 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 183 {
 184 }
 185 #endif
 186 extern void put_page_bootmem(struct page *page);
 187 extern 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
 196 void lock_memory_hotplug(void);
 197 void unlock_memory_hotplug(void);
 198
 199 #else /* ! CONFIG_MEMORY_HOTPLUG */
 200 /*
 201  * Stub functions for when hotplug is off
 202  */
 203 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 204 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 205 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 206
 207 static inline unsigned zone_span_seqbegin(struct zone *zone)
 208 {
 209         return 0;
 210 }
 211 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 212 {
 213         return 0;
 214 }
 215 static inline void zone_span_writelock(struct zone *zone) {}
 216 static inline void zone_span_writeunlock(struct zone *zone) {}
 217 static inline void zone_seqlock_init(struct zone *zone) {}
 218
 219 static 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
 226 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 227 {
 228 }
 229
 230 static inline int try_online_node(int nid)
 231 {
 232         return 0;
 233 }
 234
 235 static inline void lock_memory_hotplug(void) {}
 236 static inline void unlock_memory_hotplug(void) {}
 237
 238 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 239
 240 #ifdef CONFIG_MEMORY_HOTREMOVE
 241
 242 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 243 extern void try_offline_node(int nid);
 244 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 245 extern void remove_memory(int nid, u64 start, u64 size);
 246
 247 #else
 248 static inline int is_mem_section_removable(unsigned long pfn,
 249                                         unsigned long nr_pages)
 250 {
 251         return 0;
 252 }
 253
 254 static inline void try_offline_node(int nid) {}
 255
 256 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
 257 {
 258         return -EINVAL;
 259 }
 260
 261 static inline void remove_memory(int nid, u64 start, u64 size) {}
 262 #endif /* CONFIG_MEMORY_HOTREMOVE */
 263
 264 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
 265                 void *arg, int (*func)(struct memory_block *, void *));
 266 extern int add_memory(int nid, u64 start, u64 size);
 267 extern int arch_add_memory(int nid, u64 start, u64 size);
 268 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 269 extern bool is_memblock_offlined(struct memory_block *mem);
 270 extern void remove_memory(int nid, u64 start, u64 size);
 271 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 272                                                                 int nr_pages);
 273 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 274 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 275                                           unsigned long pnum);
 276
 277 #endif /* __LINUX_MEMORY_HOTPLUG_H */