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/mmzone.h>
   7 #include <linux/notifier.h>
   8
   9 struct page;
  10 struct zone;
  11 struct pglist_data;
  12
  13 #ifdef CONFIG_MEMORY_HOTPLUG
  14 /*
  15  * pgdat resizing functions
  16  */
  17 static inline
  18 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  19 {
  20         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  21 }
  22 static inline
  23 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  24 {
  25         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  26 }
  27 static inline
  28 void pgdat_resize_init(struct pglist_data *pgdat)
  29 {
  30         spin_lock_init(&pgdat->node_size_lock);
  31 }
  32 /*
  33  * Zone resizing functions
  34  */
  35 static inline unsigned zone_span_seqbegin(struct zone *zone)
  36 {
  37         return read_seqbegin(&zone->span_seqlock);
  38 }
  39 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  40 {
  41         return read_seqretry(&zone->span_seqlock, iv);
  42 }
  43 static inline void zone_span_writelock(struct zone *zone)
  44 {
  45         write_seqlock(&zone->span_seqlock);
  46 }
  47 static inline void zone_span_writeunlock(struct zone *zone)
  48 {
  49         write_sequnlock(&zone->span_seqlock);
  50 }
  51 static inline void zone_seqlock_init(struct zone *zone)
  52 {
  53         seqlock_init(&zone->span_seqlock);
  54 }
  55 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  56 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  57 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  58 /* need some defines for these for archs that don't support it */
  59 extern void online_page(struct page *page);
  60 /* VM interface that may be used by firmware interface */
  61 extern int online_pages(unsigned long, unsigned long);
  62
  63 /* reasonably generic interface to expand the physical pages in a zone  */
  64 extern int __add_pages(struct zone *zone, unsigned long start_pfn,
  65         unsigned long nr_pages);
  66
  67 #ifdef CONFIG_NUMA
  68 extern int memory_add_physaddr_to_nid(u64 start);
  69 #else
  70 static inline int memory_add_physaddr_to_nid(u64 start)
  71 {
  72         return 0;
  73 }
  74 #endif
  75
  76 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
  77 /*
  78  * For supporting node-hotadd, we have to allocate a new pgdat.
  79  *
  80  * If an arch has generic style NODE_DATA(),
  81  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
  82  *
  83  * In general, generic_alloc_nodedata() is used.
  84  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
  85  *
  86  */
  87 extern pg_data_t *arch_alloc_nodedata(int nid);
  88 extern void arch_free_nodedata(pg_data_t *pgdat);
  89 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
  90
  91 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
  92
  93 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
  94 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
  95
  96 #ifdef CONFIG_NUMA
  97 /*
  98  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
  99  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 100  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 101  *      To use new node's memory, more consideration will be necessary.
 102  */
 103 #define generic_alloc_nodedata(nid)                             \
 104 ({                                                              \
 105         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 106 })
 107 /*
 108  * This definition is just for error path in node hotadd.
 109  * For node hotremove, we have to replace this.
 110  */
 111 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 112
 113 extern pg_data_t *node_data[];
 114 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 115 {
 116         node_data[nid] = pgdat;
 117 }
 118
 119 #else /* !CONFIG_NUMA */
 120
 121 /* never called */
 122 static inline pg_data_t *generic_alloc_nodedata(int nid)
 123 {
 124         BUG();
 125         return NULL;
 126 }
 127 static inline void generic_free_nodedata(pg_data_t *pgdat)
 128 {
 129 }
 130 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 131 {
 132 }
 133 #endif /* CONFIG_NUMA */
 134 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 135
 136 #else /* ! CONFIG_MEMORY_HOTPLUG */
 137 /*
 138  * Stub functions for when hotplug is off
 139  */
 140 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 141 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 142 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 143
 144 static inline unsigned zone_span_seqbegin(struct zone *zone)
 145 {
 146         return 0;
 147 }
 148 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 149 {
 150         return 0;
 151 }
 152 static inline void zone_span_writelock(struct zone *zone) {}
 153 static inline void zone_span_writeunlock(struct zone *zone) {}
 154 static inline void zone_seqlock_init(struct zone *zone) {}
 155
 156 static inline int mhp_notimplemented(const char *func)
 157 {
 158         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 159         dump_stack();
 160         return -ENOSYS;
 161 }
 162
 163 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 164 static inline int __remove_pages(struct zone *zone, unsigned long start_pfn,
 165         unsigned long nr_pages)
 166 {
 167         printk(KERN_WARNING "%s() called, not yet supported\n", __FUNCTION__);
 168         dump_stack();
 169         return -ENOSYS;
 170 }
 171
 172 extern int add_memory(int nid, u64 start, u64 size);
 173 extern int arch_add_memory(int nid, u64 start, u64 size);
 174 extern int remove_memory(u64 start, u64 size);
 175
 176 #endif /* __LINUX_MEMORY_HOTPLUG_H */