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 extern int offline_pages(unsigned long, unsigned long, unsigned long);
  73
  74 /* reasonably generic interface to expand the physical pages in a zone  */
  75 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
  76         unsigned long nr_pages);
  77 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
  78         unsigned long nr_pages);
  79
  80 #ifdef CONFIG_NUMA
  81 extern int memory_add_physaddr_to_nid(u64 start);
  82 #else
  83 static inline int memory_add_physaddr_to_nid(u64 start)
  84 {
  85         return 0;
  86 }
  87 #endif
  88
  89 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
  90 /*
  91  * For supporting node-hotadd, we have to allocate a new pgdat.
  92  *
  93  * If an arch has generic style NODE_DATA(),
  94  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
  95  *
  96  * In general, generic_alloc_nodedata() is used.
  97  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
  98  *
  99  */
 100 extern pg_data_t *arch_alloc_nodedata(int nid);
 101 extern void arch_free_nodedata(pg_data_t *pgdat);
 102 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 103
 104 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 105
 106 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 107 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 108
 109 #ifdef CONFIG_NUMA
 110 /*
 111  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 112  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 113  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 114  *      To use new node's memory, more consideration will be necessary.
 115  */
 116 #define generic_alloc_nodedata(nid)                             \
 117 ({                                                              \
 118         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 119 })
 120 /*
 121  * This definition is just for error path in node hotadd.
 122  * For node hotremove, we have to replace this.
 123  */
 124 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 125
 126 extern pg_data_t *node_data[];
 127 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 128 {
 129         node_data[nid] = pgdat;
 130 }
 131
 132 #else /* !CONFIG_NUMA */
 133
 134 /* never called */
 135 static inline pg_data_t *generic_alloc_nodedata(int nid)
 136 {
 137         BUG();
 138         return NULL;
 139 }
 140 static inline void generic_free_nodedata(pg_data_t *pgdat)
 141 {
 142 }
 143 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 144 {
 145 }
 146 #endif /* CONFIG_NUMA */
 147 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 148
 149 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 150 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 151 {
 152 }
 153 static inline void put_page_bootmem(struct page *page)
 154 {
 155 }
 156 #else
 157 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 158 extern void put_page_bootmem(struct page *page);
 159 #endif
 160
 161 #else /* ! CONFIG_MEMORY_HOTPLUG */
 162 /*
 163  * Stub functions for when hotplug is off
 164  */
 165 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 166 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 167 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 168
 169 static inline unsigned zone_span_seqbegin(struct zone *zone)
 170 {
 171         return 0;
 172 }
 173 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 174 {
 175         return 0;
 176 }
 177 static inline void zone_span_writelock(struct zone *zone) {}
 178 static inline void zone_span_writeunlock(struct zone *zone) {}
 179 static inline void zone_seqlock_init(struct zone *zone) {}
 180
 181 static inline int mhp_notimplemented(const char *func)
 182 {
 183         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 184         dump_stack();
 185         return -ENOSYS;
 186 }
 187
 188 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 189 {
 190 }
 191
 192 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 193
 194 /*
 195  * Walk through all memory which is registered as resource.
 196  * arg is (start_pfn, nr_pages, private_arg_pointer)
 197  */
 198 extern int walk_memory_resource(unsigned long start_pfn,
 199                         unsigned long nr_pages, void *arg,
 200                         int (*func)(unsigned long, unsigned long, void *));
 201
 202 #ifdef CONFIG_MEMORY_HOTREMOVE
 203
 204 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 205
 206 #else
 207 static inline int is_mem_section_removable(unsigned long pfn,
 208                                         unsigned long nr_pages)
 209 {
 210         return 0;
 211 }
 212 #endif /* CONFIG_MEMORY_HOTREMOVE */
 213
 214 extern int add_memory(int nid, u64 start, u64 size);
 215 extern int arch_add_memory(int nid, u64 start, u64 size);
 216 extern int remove_memory(u64 start, u64 size);
 217 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 218                                                                 int nr_pages);
 219 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 220 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 221                                           unsigned long pnum);
 222
 223 #endif /* __LINUX_MEMORY_HOTPLUG_H */