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 extern void __offline_isolated_pages(unsigned long, unsigned long);
  62 extern int offline_pages(unsigned long, unsigned long, unsigned long);
  63
  64 /* reasonably generic interface to expand the physical pages in a zone  */
  65 extern int __add_pages(struct zone *zone, unsigned long start_pfn,
  66         unsigned long nr_pages);
  67
  68 /*
  69  * Walk thorugh all memory which is registered as resource.
  70  * arg is (start_pfn, nr_pages, private_arg_pointer)
  71  */
  72 extern int walk_memory_resource(unsigned long start_pfn,
  73                         unsigned long nr_pages, void *arg,
  74                         int (*func)(unsigned long, unsigned long, void *));
  75
  76 #ifdef CONFIG_NUMA
  77 extern int memory_add_physaddr_to_nid(u64 start);
  78 #else
  79 static inline int memory_add_physaddr_to_nid(u64 start)
  80 {
  81         return 0;
  82 }
  83 #endif
  84
  85 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
  86 /*
  87  * For supporting node-hotadd, we have to allocate a new pgdat.
  88  *
  89  * If an arch has generic style NODE_DATA(),
  90  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
  91  *
  92  * In general, generic_alloc_nodedata() is used.
  93  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
  94  *
  95  */
  96 extern pg_data_t *arch_alloc_nodedata(int nid);
  97 extern void arch_free_nodedata(pg_data_t *pgdat);
  98 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
  99
 100 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 101
 102 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 103 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 104
 105 #ifdef CONFIG_NUMA
 106 /*
 107  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 108  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 109  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 110  *      To use new node's memory, more consideration will be necessary.
 111  */
 112 #define generic_alloc_nodedata(nid)                             \
 113 ({                                                              \
 114         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 115 })
 116 /*
 117  * This definition is just for error path in node hotadd.
 118  * For node hotremove, we have to replace this.
 119  */
 120 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 121
 122 extern pg_data_t *node_data[];
 123 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 124 {
 125         node_data[nid] = pgdat;
 126 }
 127
 128 #else /* !CONFIG_NUMA */
 129
 130 /* never called */
 131 static inline pg_data_t *generic_alloc_nodedata(int nid)
 132 {
 133         BUG();
 134         return NULL;
 135 }
 136 static inline void generic_free_nodedata(pg_data_t *pgdat)
 137 {
 138 }
 139 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 140 {
 141 }
 142 #endif /* CONFIG_NUMA */
 143 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 144
 145 #else /* ! CONFIG_MEMORY_HOTPLUG */
 146 /*
 147  * Stub functions for when hotplug is off
 148  */
 149 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 150 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 151 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 152
 153 static inline unsigned zone_span_seqbegin(struct zone *zone)
 154 {
 155         return 0;
 156 }
 157 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 158 {
 159         return 0;
 160 }
 161 static inline void zone_span_writelock(struct zone *zone) {}
 162 static inline void zone_span_writeunlock(struct zone *zone) {}
 163 static inline void zone_seqlock_init(struct zone *zone) {}
 164
 165 static inline int mhp_notimplemented(const char *func)
 166 {
 167         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 168         dump_stack();
 169         return -ENOSYS;
 170 }
 171
 172 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 173
 174 extern int add_memory(int nid, u64 start, u64 size);
 175 extern int arch_add_memory(int nid, u64 start, u64 size);
 176 extern int remove_memory(u64 start, u64 size);
 177 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 178                                                                 int nr_pages);
 179
 180 #endif /* __LINUX_MEMORY_HOTPLUG_H */