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
   8 struct page;
   9 struct zone;
  10 struct pglist_data;
  11 struct mem_section;
  12
  13 #ifdef CONFIG_MEMORY_HOTPLUG
  14
  15 /*
  16  * Types for free bootmem stored in page->lru.next. These have to be in
  17  * some random range in unsigned long space for debugging purposes.
  18  */
  19 enum {
  20         MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
  21         SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
  22         MIX_SECTION_INFO,
  23         NODE_INFO,
  24         MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
  25 };
  26
  27 /*
  28  * pgdat resizing functions
  29  */
  30 static inline
  31 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  32 {
  33         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  34 }
  35 static inline
  36 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  37 {
  38         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  39 }
  40 static inline
  41 void pgdat_resize_init(struct pglist_data *pgdat)
  42 {
  43         spin_lock_init(&pgdat->node_size_lock);
  44 }
  45 /*
  46  * Zone resizing functions
  47  */
  48 static inline unsigned zone_span_seqbegin(struct zone *zone)
  49 {
  50         return read_seqbegin(&zone->span_seqlock);
  51 }
  52 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  53 {
  54         return read_seqretry(&zone->span_seqlock, iv);
  55 }
  56 static inline void zone_span_writelock(struct zone *zone)
  57 {
  58         write_seqlock(&zone->span_seqlock);
  59 }
  60 static inline void zone_span_writeunlock(struct zone *zone)
  61 {
  62         write_sequnlock(&zone->span_seqlock);
  63 }
  64 static inline void zone_seqlock_init(struct zone *zone)
  65 {
  66         seqlock_init(&zone->span_seqlock);
  67 }
  68 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  69 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  70 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  71 /* VM interface that may be used by firmware interface */
  72 extern int online_pages(unsigned long, unsigned long);
  73 extern void __offline_isolated_pages(unsigned long, unsigned long);
  74
  75 typedef void (*online_page_callback_t)(struct page *page);
  76
  77 extern int set_online_page_callback(online_page_callback_t callback);
  78 extern int restore_online_page_callback(online_page_callback_t callback);
  79
  80 extern void __online_page_set_limits(struct page *page);
  81 extern void __online_page_increment_counters(struct page *page);
  82 extern void __online_page_free(struct page *page);
  83
  84 #ifdef CONFIG_MEMORY_HOTREMOVE
  85 extern bool is_pageblock_removable_nolock(struct page *page);
  86 #endif /* CONFIG_MEMORY_HOTREMOVE */
  87
  88 /* reasonably generic interface to expand the physical pages in a zone  */
  89 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
  90         unsigned long nr_pages);
  91 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
  92         unsigned long nr_pages);
  93
  94 #ifdef CONFIG_NUMA
  95 extern int memory_add_physaddr_to_nid(u64 start);
  96 #else
  97 static inline int memory_add_physaddr_to_nid(u64 start)
  98 {
  99         return 0;
 100 }
 101 #endif
 102
 103 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 104 /*
 105  * For supporting node-hotadd, we have to allocate a new pgdat.
 106  *
 107  * If an arch has generic style NODE_DATA(),
 108  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 109  *
 110  * In general, generic_alloc_nodedata() is used.
 111  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 112  *
 113  */
 114 extern pg_data_t *arch_alloc_nodedata(int nid);
 115 extern void arch_free_nodedata(pg_data_t *pgdat);
 116 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 117
 118 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 119
 120 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 121 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 122
 123 #ifdef CONFIG_NUMA
 124 /*
 125  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 126  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 127  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 128  *      To use new node's memory, more consideration will be necessary.
 129  */
 130 #define generic_alloc_nodedata(nid)                             \
 131 ({                                                              \
 132         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 133 })
 134 /*
 135  * This definition is just for error path in node hotadd.
 136  * For node hotremove, we have to replace this.
 137  */
 138 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 139
 140 extern pg_data_t *node_data[];
 141 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 142 {
 143         node_data[nid] = pgdat;
 144 }
 145
 146 #else /* !CONFIG_NUMA */
 147
 148 /* never called */
 149 static inline pg_data_t *generic_alloc_nodedata(int nid)
 150 {
 151         BUG();
 152         return NULL;
 153 }
 154 static inline void generic_free_nodedata(pg_data_t *pgdat)
 155 {
 156 }
 157 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 158 {
 159 }
 160 #endif /* CONFIG_NUMA */
 161 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 162
 163 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 164 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 165 {
 166 }
 167 static inline void put_page_bootmem(struct page *page)
 168 {
 169 }
 170 #else
 171 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 172 extern void put_page_bootmem(struct page *page);
 173 #endif
 174
 175 /*
 176  * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
 177  * notifier will be called under this. 2) offline/online/add/remove memory
 178  * will not run simultaneously.
 179  */
 180
 181 void lock_memory_hotplug(void);
 182 void unlock_memory_hotplug(void);
 183
 184 #else /* ! CONFIG_MEMORY_HOTPLUG */
 185 /*
 186  * Stub functions for when hotplug is off
 187  */
 188 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 189 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 190 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 191
 192 static inline unsigned zone_span_seqbegin(struct zone *zone)
 193 {
 194         return 0;
 195 }
 196 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 197 {
 198         return 0;
 199 }
 200 static inline void zone_span_writelock(struct zone *zone) {}
 201 static inline void zone_span_writeunlock(struct zone *zone) {}
 202 static inline void zone_seqlock_init(struct zone *zone) {}
 203
 204 static inline int mhp_notimplemented(const char *func)
 205 {
 206         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 207         dump_stack();
 208         return -ENOSYS;
 209 }
 210
 211 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 212 {
 213 }
 214
 215 static inline void lock_memory_hotplug(void) {}
 216 static inline void unlock_memory_hotplug(void) {}
 217
 218 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 219
 220 #ifdef CONFIG_MEMORY_HOTREMOVE
 221
 222 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 223
 224 #else
 225 static inline int is_mem_section_removable(unsigned long pfn,
 226                                         unsigned long nr_pages)
 227 {
 228         return 0;
 229 }
 230 #endif /* CONFIG_MEMORY_HOTREMOVE */
 231
 232 extern int mem_online_node(int nid);
 233 extern int add_memory(int nid, u64 start, u64 size);
 234 extern int arch_add_memory(int nid, u64 start, u64 size);
 235 extern int remove_memory(u64 start, u64 size);
 236 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 237                                                                 int nr_pages);
 238 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 239 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 240                                           unsigned long pnum);
 241
 242 #endif /* __LINUX_MEMORY_HOTPLUG_H */