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 and offlined memory */
  30 enum {
  31         MMOP_OFFLINE = -1,
  32         MMOP_ONLINE_KEEP,
  33         MMOP_ONLINE_KERNEL,
  34         MMOP_ONLINE_MOVABLE,
  35 };
  36
  37 /*
  38  * pgdat resizing functions
  39  */
  40 static inline
  41 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  42 {
  43         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  44 }
  45 static inline
  46 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  47 {
  48         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  49 }
  50 static inline
  51 void pgdat_resize_init(struct pglist_data *pgdat)
  52 {
  53         spin_lock_init(&pgdat->node_size_lock);
  54 }
  55 /*
  56  * Zone resizing functions
  57  *
  58  * Note: any attempt to resize a zone should has pgdat_resize_lock()
  59  * zone_span_writelock() both held. This ensure the size of a zone
  60  * can't be changed while pgdat_resize_lock() held.
  61  */
  62 static inline unsigned zone_span_seqbegin(struct zone *zone)
  63 {
  64         return read_seqbegin(&zone->span_seqlock);
  65 }
  66 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  67 {
  68         return read_seqretry(&zone->span_seqlock, iv);
  69 }
  70 static inline void zone_span_writelock(struct zone *zone)
  71 {
  72         write_seqlock(&zone->span_seqlock);
  73 }
  74 static inline void zone_span_writeunlock(struct zone *zone)
  75 {
  76         write_sequnlock(&zone->span_seqlock);
  77 }
  78 static inline void zone_seqlock_init(struct zone *zone)
  79 {
  80         seqlock_init(&zone->span_seqlock);
  81 }
  82 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  83 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  84 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  85 /* VM interface that may be used by firmware interface */
  86 extern int online_pages(unsigned long, unsigned long, int);
  87 extern void __offline_isolated_pages(unsigned long, unsigned long);
  88
  89 typedef void (*online_page_callback_t)(struct page *page);
  90
  91 extern int set_online_page_callback(online_page_callback_t callback);
  92 extern int restore_online_page_callback(online_page_callback_t callback);
  93
  94 extern void __online_page_set_limits(struct page *page);
  95 extern void __online_page_increment_counters(struct page *page);
  96 extern void __online_page_free(struct page *page);
  97
  98 extern int try_online_node(int nid);
  99
 100 #ifdef CONFIG_MEMORY_HOTREMOVE
 101 extern bool is_pageblock_removable_nolock(struct page *page);
 102 extern int arch_remove_memory(u64 start, u64 size);
 103 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
 104         unsigned long nr_pages);
 105 #endif /* CONFIG_MEMORY_HOTREMOVE */
 106
 107 /* reasonably generic interface to expand the physical pages in a zone  */
 108 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
 109         unsigned long nr_pages);
 110
 111 #ifdef CONFIG_NUMA
 112 extern int memory_add_physaddr_to_nid(u64 start);
 113 #else
 114 static inline int memory_add_physaddr_to_nid(u64 start)
 115 {
 116         return 0;
 117 }
 118 #endif
 119
 120 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 121 /*
 122  * For supporting node-hotadd, we have to allocate a new pgdat.
 123  *
 124  * If an arch has generic style NODE_DATA(),
 125  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 126  *
 127  * In general, generic_alloc_nodedata() is used.
 128  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 129  *
 130  */
 131 extern pg_data_t *arch_alloc_nodedata(int nid);
 132 extern void arch_free_nodedata(pg_data_t *pgdat);
 133 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 134
 135 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 136
 137 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 138 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 139
 140 #ifdef CONFIG_NUMA
 141 /*
 142  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 143  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 144  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 145  *      To use new node's memory, more consideration will be necessary.
 146  */
 147 #define generic_alloc_nodedata(nid)                             \
 148 ({                                                              \
 149         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 150 })
 151 /*
 152  * This definition is just for error path in node hotadd.
 153  * For node hotremove, we have to replace this.
 154  */
 155 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 156
 157 extern pg_data_t *node_data[];
 158 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 159 {
 160         node_data[nid] = pgdat;
 161 }
 162
 163 #else /* !CONFIG_NUMA */
 164
 165 /* never called */
 166 static inline pg_data_t *generic_alloc_nodedata(int nid)
 167 {
 168         BUG();
 169         return NULL;
 170 }
 171 static inline void generic_free_nodedata(pg_data_t *pgdat)
 172 {
 173 }
 174 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 175 {
 176 }
 177 #endif /* CONFIG_NUMA */
 178 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 179
 180 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
 181 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 182 #else
 183 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 184 {
 185 }
 186 #endif
 187 extern void put_page_bootmem(struct page *page);
 188 extern void get_page_bootmem(unsigned long ingo, struct page *page,
 189                              unsigned long type);
 190
 191 void get_online_mems(void);
 192 void put_online_mems(void);
 193
 194 #else /* ! CONFIG_MEMORY_HOTPLUG */
 195 /*
 196  * Stub functions for when hotplug is off
 197  */
 198 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 199 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 200 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 201
 202 static inline unsigned zone_span_seqbegin(struct zone *zone)
 203 {
 204         return 0;
 205 }
 206 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 207 {
 208         return 0;
 209 }
 210 static inline void zone_span_writelock(struct zone *zone) {}
 211 static inline void zone_span_writeunlock(struct zone *zone) {}
 212 static inline void zone_seqlock_init(struct zone *zone) {}
 213
 214 static inline int mhp_notimplemented(const char *func)
 215 {
 216         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 217         dump_stack();
 218         return -ENOSYS;
 219 }
 220
 221 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 222 {
 223 }
 224
 225 static inline int try_online_node(int nid)
 226 {
 227         return 0;
 228 }
 229
 230 static inline void get_online_mems(void) {}
 231 static inline void put_online_mems(void) {}
 232
 233 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 234
 235 #ifdef CONFIG_MEMORY_HOTREMOVE
 236
 237 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 238 extern void try_offline_node(int nid);
 239 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 240 extern void remove_memory(int nid, u64 start, u64 size);
 241
 242 #else
 243 static inline int is_mem_section_removable(unsigned long pfn,
 244                                         unsigned long nr_pages)
 245 {
 246         return 0;
 247 }
 248
 249 static inline void try_offline_node(int nid) {}
 250
 251 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
 252 {
 253         return -EINVAL;
 254 }
 255
 256 static inline void remove_memory(int nid, u64 start, u64 size) {}
 257 #endif /* CONFIG_MEMORY_HOTREMOVE */
 258
 259 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
 260                 void *arg, int (*func)(struct memory_block *, void *));
 261 extern int add_memory(int nid, u64 start, u64 size);
 262 extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default);
 263 extern int arch_add_memory(int nid, u64 start, u64 size);
 264 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 265 extern bool is_memblock_offlined(struct memory_block *mem);
 266 extern void remove_memory(int nid, u64 start, u64 size);
 267 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
 268 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 269 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 270                                           unsigned long pnum);
 271
 272 #endif /* __LINUX_MEMORY_HOTPLUG_H */