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 stored in page->lru.next. These have to be in
  17  * some random range in unsigned long space for debugging purposes.
  18  */
  19 enum {
  20         MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
  21         SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
  22         MIX_SECTION_INFO,
  23         NODE_INFO,
  24         MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
  25 };
  26
  27 /*
  28  * pgdat resizing functions
  29  */
  30 static inline
  31 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  32 {
  33         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  34 }
  35 static inline
  36 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  37 {
  38         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  39 }
  40 static inline
  41 void pgdat_resize_init(struct pglist_data *pgdat)
  42 {
  43         spin_lock_init(&pgdat->node_size_lock);
  44 }
  45 /*
  46  * Zone resizing functions
  47  */
  48 static inline unsigned zone_span_seqbegin(struct zone *zone)
  49 {
  50         return read_seqbegin(&zone->span_seqlock);
  51 }
  52 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  53 {
  54         return read_seqretry(&zone->span_seqlock, iv);
  55 }
  56 static inline void zone_span_writelock(struct zone *zone)
  57 {
  58         write_seqlock(&zone->span_seqlock);
  59 }
  60 static inline void zone_span_writeunlock(struct zone *zone)
  61 {
  62         write_sequnlock(&zone->span_seqlock);
  63 }
  64 static inline void zone_seqlock_init(struct zone *zone)
  65 {
  66         seqlock_init(&zone->span_seqlock);
  67 }
  68 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  69 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  70 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  71 /* need some defines for these for archs that don't support it */
  72 extern void online_page(struct page *page);
  73 /* VM interface that may be used by firmware interface */
  74 extern int online_pages(unsigned long, unsigned long);
  75 extern void __offline_isolated_pages(unsigned long, unsigned long);
  76
  77 #ifdef CONFIG_MEMORY_HOTREMOVE
  78 extern bool is_pageblock_removable_nolock(struct page *page);
  79 #endif /* CONFIG_MEMORY_HOTREMOVE */
  80
  81 /* reasonably generic interface to expand the physical pages in a zone  */
  82 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
  83         unsigned long nr_pages);
  84 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
  85         unsigned long nr_pages);
  86
  87 #ifdef CONFIG_NUMA
  88 extern int memory_add_physaddr_to_nid(u64 start);
  89 #else
  90 static inline int memory_add_physaddr_to_nid(u64 start)
  91 {
  92         return 0;
  93 }
  94 #endif
  95
  96 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
  97 /*
  98  * For supporting node-hotadd, we have to allocate a new pgdat.
  99  *
 100  * If an arch has generic style NODE_DATA(),
 101  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 102  *
 103  * In general, generic_alloc_nodedata() is used.
 104  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 105  *
 106  */
 107 extern pg_data_t *arch_alloc_nodedata(int nid);
 108 extern void arch_free_nodedata(pg_data_t *pgdat);
 109 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 110
 111 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 112
 113 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 114 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 115
 116 #ifdef CONFIG_NUMA
 117 /*
 118  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 119  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 120  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 121  *      To use new node's memory, more consideration will be necessary.
 122  */
 123 #define generic_alloc_nodedata(nid)                             \
 124 ({                                                              \
 125         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 126 })
 127 /*
 128  * This definition is just for error path in node hotadd.
 129  * For node hotremove, we have to replace this.
 130  */
 131 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 132
 133 extern pg_data_t *node_data[];
 134 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 135 {
 136         node_data[nid] = pgdat;
 137 }
 138
 139 #else /* !CONFIG_NUMA */
 140
 141 /* never called */
 142 static inline pg_data_t *generic_alloc_nodedata(int nid)
 143 {
 144         BUG();
 145         return NULL;
 146 }
 147 static inline void generic_free_nodedata(pg_data_t *pgdat)
 148 {
 149 }
 150 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 151 {
 152 }
 153 #endif /* CONFIG_NUMA */
 154 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 155
 156 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 157 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 158 {
 159 }
 160 static inline void put_page_bootmem(struct page *page)
 161 {
 162 }
 163 #else
 164 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 165 extern void put_page_bootmem(struct page *page);
 166 #endif
 167
 168 /*
 169  * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
 170  * notifier will be called under this. 2) offline/online/add/remove memory
 171  * will not run simultaneously.
 172  */
 173
 174 void lock_memory_hotplug(void);
 175 void unlock_memory_hotplug(void);
 176
 177 #else /* ! CONFIG_MEMORY_HOTPLUG */
 178 /*
 179  * Stub functions for when hotplug is off
 180  */
 181 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 182 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 183 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 184
 185 static inline unsigned zone_span_seqbegin(struct zone *zone)
 186 {
 187         return 0;
 188 }
 189 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 190 {
 191         return 0;
 192 }
 193 static inline void zone_span_writelock(struct zone *zone) {}
 194 static inline void zone_span_writeunlock(struct zone *zone) {}
 195 static inline void zone_seqlock_init(struct zone *zone) {}
 196
 197 static inline int mhp_notimplemented(const char *func)
 198 {
 199         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 200         dump_stack();
 201         return -ENOSYS;
 202 }
 203
 204 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 205 {
 206 }
 207
 208 static inline void lock_memory_hotplug(void) {}
 209 static inline void unlock_memory_hotplug(void) {}
 210
 211 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 212
 213 #ifdef CONFIG_MEMORY_HOTREMOVE
 214
 215 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 216
 217 #else
 218 static inline int is_mem_section_removable(unsigned long pfn,
 219                                         unsigned long nr_pages)
 220 {
 221         return 0;
 222 }
 223 #endif /* CONFIG_MEMORY_HOTREMOVE */
 224
 225 extern int mem_online_node(int nid);
 226 extern int add_memory(int nid, u64 start, u64 size);
 227 extern int arch_add_memory(int nid, u64 start, u64 size);
 228 extern int remove_memory(u64 start, u64 size);
 229 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 230                                                                 int nr_pages);
 231 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 232 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 233                                           unsigned long pnum);
 234
 235 #endif /* __LINUX_MEMORY_HOTPLUG_H */