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