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 /*
  30  * pgdat resizing functions
  31  */
  32 static inline
  33 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  34 {
  35         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  36 }
  37 static inline
  38 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  39 {
  40         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  41 }
  42 static inline
  43 void pgdat_resize_init(struct pglist_data *pgdat)
  44 {
  45         spin_lock_init(&pgdat->node_size_lock);
  46 }
  47 /*
  48  * Zone resizing functions
  49  */
  50 static inline unsigned zone_span_seqbegin(struct zone *zone)
  51 {
  52         return read_seqbegin(&zone->span_seqlock);
  53 }
  54 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  55 {
  56         return read_seqretry(&zone->span_seqlock, iv);
  57 }
  58 static inline void zone_span_writelock(struct zone *zone)
  59 {
  60         write_seqlock(&zone->span_seqlock);
  61 }
  62 static inline void zone_span_writeunlock(struct zone *zone)
  63 {
  64         write_sequnlock(&zone->span_seqlock);
  65 }
  66 static inline void zone_seqlock_init(struct zone *zone)
  67 {
  68         seqlock_init(&zone->span_seqlock);
  69 }
  70 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  71 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  72 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  73 /* VM interface that may be used by firmware interface */
  74 extern int online_pages(unsigned long, unsigned long);
  75 extern void __offline_isolated_pages(unsigned long, unsigned long);
  76
  77 typedef void (*online_page_callback_t)(struct page *page);
  78
  79 extern int set_online_page_callback(online_page_callback_t callback);
  80 extern int restore_online_page_callback(online_page_callback_t callback);
  81
  82 extern void __online_page_set_limits(struct page *page);
  83 extern void __online_page_increment_counters(struct page *page);
  84 extern void __online_page_free(struct page *page);
  85
  86 #ifdef CONFIG_MEMORY_HOTREMOVE
  87 extern bool is_pageblock_removable_nolock(struct page *page);
  88 #endif /* CONFIG_MEMORY_HOTREMOVE */
  89
  90 /* reasonably generic interface to expand the physical pages in a zone  */
  91 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
  92         unsigned long nr_pages);
  93 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
  94         unsigned long nr_pages);
  95
  96 #ifdef CONFIG_NUMA
  97 extern int memory_add_physaddr_to_nid(u64 start);
  98 #else
  99 static inline int memory_add_physaddr_to_nid(u64 start)
 100 {
 101         return 0;
 102 }
 103 #endif
 104
 105 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 106 /*
 107  * For supporting node-hotadd, we have to allocate a new pgdat.
 108  *
 109  * If an arch has generic style NODE_DATA(),
 110  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 111  *
 112  * In general, generic_alloc_nodedata() is used.
 113  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 114  *
 115  */
 116 extern pg_data_t *arch_alloc_nodedata(int nid);
 117 extern void arch_free_nodedata(pg_data_t *pgdat);
 118 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 119
 120 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 121
 122 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 123 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 124
 125 #ifdef CONFIG_NUMA
 126 /*
 127  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 128  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 129  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 130  *      To use new node's memory, more consideration will be necessary.
 131  */
 132 #define generic_alloc_nodedata(nid)                             \
 133 ({                                                              \
 134         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 135 })
 136 /*
 137  * This definition is just for error path in node hotadd.
 138  * For node hotremove, we have to replace this.
 139  */
 140 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 141
 142 extern pg_data_t *node_data[];
 143 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 144 {
 145         node_data[nid] = pgdat;
 146 }
 147
 148 #else /* !CONFIG_NUMA */
 149
 150 /* never called */
 151 static inline pg_data_t *generic_alloc_nodedata(int nid)
 152 {
 153         BUG();
 154         return NULL;
 155 }
 156 static inline void generic_free_nodedata(pg_data_t *pgdat)
 157 {
 158 }
 159 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 160 {
 161 }
 162 #endif /* CONFIG_NUMA */
 163 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 164
 165 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 166 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 167 {
 168 }
 169 static inline void put_page_bootmem(struct page *page)
 170 {
 171 }
 172 #else
 173 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 174 extern void put_page_bootmem(struct page *page);
 175 #endif
 176
 177 /*
 178  * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
 179  * notifier will be called under this. 2) offline/online/add/remove memory
 180  * will not run simultaneously.
 181  */
 182
 183 void lock_memory_hotplug(void);
 184 void unlock_memory_hotplug(void);
 185
 186 #else /* ! CONFIG_MEMORY_HOTPLUG */
 187 /*
 188  * Stub functions for when hotplug is off
 189  */
 190 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 191 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 192 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 193
 194 static inline unsigned zone_span_seqbegin(struct zone *zone)
 195 {
 196         return 0;
 197 }
 198 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 199 {
 200         return 0;
 201 }
 202 static inline void zone_span_writelock(struct zone *zone) {}
 203 static inline void zone_span_writeunlock(struct zone *zone) {}
 204 static inline void zone_seqlock_init(struct zone *zone) {}
 205
 206 static inline int mhp_notimplemented(const char *func)
 207 {
 208         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 209         dump_stack();
 210         return -ENOSYS;
 211 }
 212
 213 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 214 {
 215 }
 216
 217 static inline void lock_memory_hotplug(void) {}
 218 static inline void unlock_memory_hotplug(void) {}
 219
 220 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 221
 222 #ifdef CONFIG_MEMORY_HOTREMOVE
 223
 224 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 225
 226 #else
 227 static inline int is_mem_section_removable(unsigned long pfn,
 228                                         unsigned long nr_pages)
 229 {
 230         return 0;
 231 }
 232 #endif /* CONFIG_MEMORY_HOTREMOVE */
 233
 234 extern int mem_online_node(int nid);
 235 extern int add_memory(int nid, u64 start, u64 size);
 236 extern int arch_add_memory(int nid, u64 start, u64 size);
 237 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 238 extern int offline_memory_block(struct memory_block *mem);
 239 extern int remove_memory(u64 start, u64 size);
 240 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 241                                                                 int nr_pages);
 242 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 243 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 244                                           unsigned long pnum);
 245
 246 #endif /* __LINUX_MEMORY_HOTPLUG_H */