release/src-rt-6.x.4708/linux/linux-2.6.36/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.
  17  * The normal smallest mapcount is -1. Here is smaller value than it.
  18  */
  19 #define SECTION_INFO            (-1 - 1)
  20 #define MIX_SECTION_INFO        (-1 - 2)
  21 #define NODE_INFO               (-1 - 3)
  22
  23 /*
  24  * pgdat resizing functions
  25  */
  26 static inline
  27 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  28 {
  29         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  30 }
  31 static inline
  32 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  33 {
  34         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  35 }
  36 static inline
  37 void pgdat_resize_init(struct pglist_data *pgdat)
  38 {
  39         spin_lock_init(&pgdat->node_size_lock);
  40 }
  41 /*
  42  * Zone resizing functions
  43  */
  44 static inline unsigned zone_span_seqbegin(struct zone *zone)
  45 {
  46         return read_seqbegin(&zone->span_seqlock);
  47 }
  48 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  49 {
  50         return read_seqretry(&zone->span_seqlock, iv);
  51 }
  52 static inline void zone_span_writelock(struct zone *zone)
  53 {
  54         write_seqlock(&zone->span_seqlock);
  55 }
  56 static inline void zone_span_writeunlock(struct zone *zone)
  57 {
  58         write_sequnlock(&zone->span_seqlock);
  59 }
  60 static inline void zone_seqlock_init(struct zone *zone)
  61 {
  62         seqlock_init(&zone->span_seqlock);
  63 }
  64 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  65 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  66 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  67 /* need some defines for these for archs that don't support it */
  68 extern void online_page(struct page *page);
  69 /* VM interface that may be used by firmware interface */
  70 extern int online_pages(unsigned long, unsigned long);
  71 extern void __offline_isolated_pages(unsigned long, unsigned long);
  72
  73 /* reasonably generic interface to expand the physical pages in a zone  */
  74 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
  75         unsigned long nr_pages);
  76 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
  77         unsigned long nr_pages);
  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 #define generic_alloc_nodedata(nid)                             \
 110 ({                                                              \
 111         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 112 })
 113 /*
 114  * This definition is just for error path in node hotadd.
 115  * For node hotremove, we have to replace this.
 116  */
 117 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 118
 119 extern pg_data_t *node_data[];
 120 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 121 {
 122         node_data[nid] = pgdat;
 123 }
 124
 125 #else /* !CONFIG_NUMA */
 126
 127 /* never called */
 128 static inline pg_data_t *generic_alloc_nodedata(int nid)
 129 {
 130         BUG();
 131         return NULL;
 132 }
 133 static inline void generic_free_nodedata(pg_data_t *pgdat)
 134 {
 135 }
 136 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 137 {
 138 }
 139 #endif /* CONFIG_NUMA */
 140 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 141
 142 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 143 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 144 {
 145 }
 146 static inline void put_page_bootmem(struct page *page)
 147 {
 148 }
 149 #else
 150 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 151 extern void put_page_bootmem(struct page *page);
 152 #endif
 153
 154 #else /* ! CONFIG_MEMORY_HOTPLUG */
 155 /*
 156  * Stub functions for when hotplug is off
 157  */
 158 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 159 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 160 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 161
 162 static inline unsigned zone_span_seqbegin(struct zone *zone)
 163 {
 164         return 0;
 165 }
 166 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 167 {
 168         return 0;
 169 }
 170 static inline void zone_span_writelock(struct zone *zone) {}
 171 static inline void zone_span_writeunlock(struct zone *zone) {}
 172 static inline void zone_seqlock_init(struct zone *zone) {}
 173
 174 static inline int mhp_notimplemented(const char *func)
 175 {
 176         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 177         dump_stack();
 178         return -ENOSYS;
 179 }
 180
 181 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 182 {
 183 }
 184
 185 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 186
 187 #ifdef CONFIG_MEMORY_HOTREMOVE
 188
 189 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 190
 191 #else
 192 static inline int is_mem_section_removable(unsigned long pfn,
 193                                         unsigned long nr_pages)
 194 {
 195         return 0;
 196 }
 197 #endif /* CONFIG_MEMORY_HOTREMOVE */
 198
 199 extern int mem_online_node(int nid);
 200 extern int add_memory(int nid, u64 start, u64 size);
 201 extern int arch_add_memory(int nid, u64 start, u64 size);
 202 extern int remove_memory(u64 start, u64 size);
 203 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 204                                                                 int nr_pages);
 205 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 206 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 207                                           unsigned long pnum);
 208
 209 #endif /* __LINUX_MEMORY_HOTPLUG_H */