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  * Magic number for free bootmem.
  17  * The normal smallest mapcount is -1. Here is smaller value than it.
  18  */
  19 #define SECTION_INFO            0xfffffffe
  20 #define MIX_INFO                0xfffffffd
  21 #define NODE_INFO               0xfffffffc
  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(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 /*
  81  * Walk through all memory which is registered as resource.
  82  * arg is (start_pfn, nr_pages, private_arg_pointer)
  83  */
  84 extern int walk_memory_resource(unsigned long start_pfn,
  85                         unsigned long nr_pages, void *arg,
  86                         int (*func)(unsigned long, unsigned long, void *));
  87
  88 #ifdef CONFIG_NUMA
  89 extern int memory_add_physaddr_to_nid(u64 start);
  90 #else
  91 static inline int memory_add_physaddr_to_nid(u64 start)
  92 {
  93         return 0;
  94 }
  95 #endif
  96
  97 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
  98 /*
  99  * For supporting node-hotadd, we have to allocate a new pgdat.
 100  *
 101  * If an arch has generic style NODE_DATA(),
 102  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 103  *
 104  * In general, generic_alloc_nodedata() is used.
 105  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 106  *
 107  */
 108 extern pg_data_t *arch_alloc_nodedata(int nid);
 109 extern void arch_free_nodedata(pg_data_t *pgdat);
 110 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 111
 112 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 113
 114 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 115 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 116
 117 #ifdef CONFIG_NUMA
 118 /*
 119  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 120  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 121  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 122  *      To use new node's memory, more consideration will be necessary.
 123  */
 124 #define generic_alloc_nodedata(nid)                             \
 125 ({                                                              \
 126         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 127 })
 128 /*
 129  * This definition is just for error path in node hotadd.
 130  * For node hotremove, we have to replace this.
 131  */
 132 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 133
 134 extern pg_data_t *node_data[];
 135 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 136 {
 137         node_data[nid] = pgdat;
 138 }
 139
 140 #else /* !CONFIG_NUMA */
 141
 142 /* never called */
 143 static inline pg_data_t *generic_alloc_nodedata(int nid)
 144 {
 145         BUG();
 146         return NULL;
 147 }
 148 static inline void generic_free_nodedata(pg_data_t *pgdat)
 149 {
 150 }
 151 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 152 {
 153 }
 154 #endif /* CONFIG_NUMA */
 155 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 156
 157 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 158 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 159 {
 160 }
 161 static inline void put_page_bootmem(struct page *page)
 162 {
 163 }
 164 #else
 165 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 166 extern void put_page_bootmem(struct page *page);
 167 #endif
 168
 169 #else /* ! CONFIG_MEMORY_HOTPLUG */
 170 /*
 171  * Stub functions for when hotplug is off
 172  */
 173 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 174 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 175 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 176
 177 static inline unsigned zone_span_seqbegin(struct zone *zone)
 178 {
 179         return 0;
 180 }
 181 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 182 {
 183         return 0;
 184 }
 185 static inline void zone_span_writelock(struct zone *zone) {}
 186 static inline void zone_span_writeunlock(struct zone *zone) {}
 187 static inline void zone_seqlock_init(struct zone *zone) {}
 188
 189 static inline int mhp_notimplemented(const char *func)
 190 {
 191         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 192         dump_stack();
 193         return -ENOSYS;
 194 }
 195
 196 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 197 {
 198 }
 199
 200 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 201
 202 extern int add_memory(int nid, u64 start, u64 size);
 203 extern int arch_add_memory(int nid, u64 start, u64 size);
 204 extern int remove_memory(u64 start, u64 size);
 205 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 206                                                                 int nr_pages);
 207 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 208 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 209                                           unsigned long pnum);
 210
 211 #endif /* __LINUX_MEMORY_HOTPLUG_H */