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  * 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 extern void __offline_isolated_pages(unsigned long, unsigned long);
  63 extern int offline_pages(unsigned long, unsigned long, unsigned long);
  64
  65 /* reasonably generic interface to expand the physical pages in a zone  */
  66 extern int __add_pages(struct zone *zone, unsigned long start_pfn,
  67         unsigned long nr_pages);
  68 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
  69         unsigned long nr_pages);
  70
  71 /*
  72  * Walk through all memory which is registered as resource.
  73  * arg is (start_pfn, nr_pages, private_arg_pointer)
  74  */
  75 extern int walk_memory_resource(unsigned long start_pfn,
  76                         unsigned long nr_pages, void *arg,
  77                         int (*func)(unsigned long, unsigned long, void *));
  78
  79 #ifdef CONFIG_NUMA
  80 extern int memory_add_physaddr_to_nid(u64 start);
  81 #else
  82 static inline int memory_add_physaddr_to_nid(u64 start)
  83 {
  84         return 0;
  85 }
  86 #endif
  87
  88 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
  89 /*
  90  * For supporting node-hotadd, we have to allocate a new pgdat.
  91  *
  92  * If an arch has generic style NODE_DATA(),
  93  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
  94  *
  95  * In general, generic_alloc_nodedata() is used.
  96  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
  97  *
  98  */
  99 extern pg_data_t *arch_alloc_nodedata(int nid);
 100 extern void arch_free_nodedata(pg_data_t *pgdat);
 101 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 102
 103 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 104
 105 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 106 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 107
 108 #ifdef CONFIG_NUMA
 109 /*
 110  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 111  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 112  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 113  *      To use new node's memory, more consideration will be necessary.
 114  */
 115 #define generic_alloc_nodedata(nid)                             \
 116 ({                                                              \
 117         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 118 })
 119 /*
 120  * This definition is just for error path in node hotadd.
 121  * For node hotremove, we have to replace this.
 122  */
 123 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 124
 125 extern pg_data_t *node_data[];
 126 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 127 {
 128         node_data[nid] = pgdat;
 129 }
 130
 131 #else /* !CONFIG_NUMA */
 132
 133 /* never called */
 134 static inline pg_data_t *generic_alloc_nodedata(int nid)
 135 {
 136         BUG();
 137         return NULL;
 138 }
 139 static inline void generic_free_nodedata(pg_data_t *pgdat)
 140 {
 141 }
 142 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 143 {
 144 }
 145 #endif /* CONFIG_NUMA */
 146 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 147
 148 #else /* ! CONFIG_MEMORY_HOTPLUG */
 149 /*
 150  * Stub functions for when hotplug is off
 151  */
 152 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 153 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 154 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 155
 156 static inline unsigned zone_span_seqbegin(struct zone *zone)
 157 {
 158         return 0;
 159 }
 160 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 161 {
 162         return 0;
 163 }
 164 static inline void zone_span_writelock(struct zone *zone) {}
 165 static inline void zone_span_writeunlock(struct zone *zone) {}
 166 static inline void zone_seqlock_init(struct zone *zone) {}
 167
 168 static inline int mhp_notimplemented(const char *func)
 169 {
 170         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 171         dump_stack();
 172         return -ENOSYS;
 173 }
 174
 175 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 176
 177 extern int add_memory(int nid, u64 start, u64 size);
 178 extern int arch_add_memory(int nid, u64 start, u64 size);
 179 extern int remove_memory(u64 start, u64 size);
 180 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 181                                                                 int nr_pages);
 182 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 183
 184 #endif /* __LINUX_MEMORY_HOTPLUG_H */