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 #ifdef CONFIG_MEMORY_HOTREMOVE
  74 extern bool is_pageblock_removable_nolock(struct page *page);
  75 #endif /* CONFIG_MEMORY_HOTREMOVE */
  76
  77 /* reasonably generic interface to expand the physical pages in a zone  */
  78 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
  79         unsigned long nr_pages);
  80 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
  81         unsigned long nr_pages);
  82
  83 #ifdef CONFIG_NUMA
  84 extern int memory_add_physaddr_to_nid(u64 start);
  85 #else
  86 static inline int memory_add_physaddr_to_nid(u64 start)
  87 {
  88         return 0;
  89 }
  90 #endif
  91
  92 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
  93 /*
  94  * For supporting node-hotadd, we have to allocate a new pgdat.
  95  *
  96  * If an arch has generic style NODE_DATA(),
  97  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
  98  *
  99  * In general, generic_alloc_nodedata() is used.
 100  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 101  *
 102  */
 103 extern pg_data_t *arch_alloc_nodedata(int nid);
 104 extern void arch_free_nodedata(pg_data_t *pgdat);
 105 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 106
 107 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 108
 109 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 110 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 111
 112 #ifdef CONFIG_NUMA
 113 /*
 114  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 115  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 116  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 117  *      To use new node's memory, more consideration will be necessary.
 118  */
 119 #define generic_alloc_nodedata(nid)                             \
 120 ({                                                              \
 121         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 122 })
 123 /*
 124  * This definition is just for error path in node hotadd.
 125  * For node hotremove, we have to replace this.
 126  */
 127 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 128
 129 extern pg_data_t *node_data[];
 130 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 131 {
 132         node_data[nid] = pgdat;
 133 }
 134
 135 #else /* !CONFIG_NUMA */
 136
 137 /* never called */
 138 static inline pg_data_t *generic_alloc_nodedata(int nid)
 139 {
 140         BUG();
 141         return NULL;
 142 }
 143 static inline void generic_free_nodedata(pg_data_t *pgdat)
 144 {
 145 }
 146 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 147 {
 148 }
 149 #endif /* CONFIG_NUMA */
 150 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 151
 152 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 153 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 154 {
 155 }
 156 static inline void put_page_bootmem(struct page *page)
 157 {
 158 }
 159 #else
 160 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 161 extern void put_page_bootmem(struct page *page);
 162 #endif
 163
 164 void lock_memory_hotplug(void);
 165 void unlock_memory_hotplug(void);
 166
 167 #else /* ! CONFIG_MEMORY_HOTPLUG */
 168 /*
 169  * Stub functions for when hotplug is off
 170  */
 171 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 172 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 173 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 174
 175 static inline unsigned zone_span_seqbegin(struct zone *zone)
 176 {
 177         return 0;
 178 }
 179 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 180 {
 181         return 0;
 182 }
 183 static inline void zone_span_writelock(struct zone *zone) {}
 184 static inline void zone_span_writeunlock(struct zone *zone) {}
 185 static inline void zone_seqlock_init(struct zone *zone) {}
 186
 187 static inline int mhp_notimplemented(const char *func)
 188 {
 189         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 190         dump_stack();
 191         return -ENOSYS;
 192 }
 193
 194 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 195 {
 196 }
 197
 198 static inline void lock_memory_hotplug(void) {}
 199 static inline void unlock_memory_hotplug(void) {}
 200
 201 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 202
 203 #ifdef CONFIG_MEMORY_HOTREMOVE
 204
 205 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 206
 207 #else
 208 static inline int is_mem_section_removable(unsigned long pfn,
 209                                         unsigned long nr_pages)
 210 {
 211         return 0;
 212 }
 213 #endif /* CONFIG_MEMORY_HOTREMOVE */
 214
 215 extern int mem_online_node(int nid);
 216 extern int add_memory(int nid, u64 start, u64 size);
 217 extern int arch_add_memory(int nid, u64 start, u64 size);
 218 extern int remove_memory(u64 start, u64 size);
 219 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 220                                                                 int nr_pages);
 221 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 222 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 223                                           unsigned long pnum);
 224
 225 #endif /* __LINUX_MEMORY_HOTPLUG_H */