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 /*
 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 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 149 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 150 {
 151 }
 152 static inline void put_page_bootmem(struct page *page)
 153 {
 154 }
 155 #else
 156 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 157 extern void put_page_bootmem(struct page *page);
 158 #endif
 159
 160 #else /* ! CONFIG_MEMORY_HOTPLUG */
 161 /*
 162  * Stub functions for when hotplug is off
 163  */
 164 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 165 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 166 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 167
 168 static inline unsigned zone_span_seqbegin(struct zone *zone)
 169 {
 170         return 0;
 171 }
 172 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 173 {
 174         return 0;
 175 }
 176 static inline void zone_span_writelock(struct zone *zone) {}
 177 static inline void zone_span_writeunlock(struct zone *zone) {}
 178 static inline void zone_seqlock_init(struct zone *zone) {}
 179
 180 static inline int mhp_notimplemented(const char *func)
 181 {
 182         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 183         dump_stack();
 184         return -ENOSYS;
 185 }
 186
 187 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 188 {
 189 }
 190
 191 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 192
 193 #ifdef CONFIG_MEMORY_HOTREMOVE
 194
 195 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 196
 197 #else
 198 static inline int is_mem_section_removable(unsigned long pfn,
 199                                         unsigned long nr_pages)
 200 {
 201         return 0;
 202 }
 203 #endif /* CONFIG_MEMORY_HOTREMOVE */
 204
 205 extern int add_memory(int nid, u64 start, u64 size);
 206 extern int arch_add_memory(int nid, u64 start, u64 size);
 207 extern int remove_memory(u64 start, u64 size);
 208 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 209                                                                 int nr_pages);
 210 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 211 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 212                                           unsigned long pnum);
 213
 214 #endif /* __LINUX_MEMORY_HOTPLUG_H */