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 #include <linux/bug.h>
   8
   9 struct page;
  10 struct zone;
  11 struct pglist_data;
  12 struct mem_section;
  13
  14 #ifdef CONFIG_MEMORY_HOTPLUG
  15
  16 /*
  17  * Types for free bootmem stored in page->lru.next. These have to be in
  18  * some random range in unsigned long space for debugging purposes.
  19  */
  20 enum {
  21         MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
  22         SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
  23         MIX_SECTION_INFO,
  24         NODE_INFO,
  25         MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
  26 };
  27
  28 /*
  29  * pgdat resizing functions
  30  */
  31 static inline
  32 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  33 {
  34         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  35 }
  36 static inline
  37 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  38 {
  39         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  40 }
  41 static inline
  42 void pgdat_resize_init(struct pglist_data *pgdat)
  43 {
  44         spin_lock_init(&pgdat->node_size_lock);
  45 }
  46 /*
  47  * Zone resizing functions
  48  */
  49 static inline unsigned zone_span_seqbegin(struct zone *zone)
  50 {
  51         return read_seqbegin(&zone->span_seqlock);
  52 }
  53 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  54 {
  55         return read_seqretry(&zone->span_seqlock, iv);
  56 }
  57 static inline void zone_span_writelock(struct zone *zone)
  58 {
  59         write_seqlock(&zone->span_seqlock);
  60 }
  61 static inline void zone_span_writeunlock(struct zone *zone)
  62 {
  63         write_sequnlock(&zone->span_seqlock);
  64 }
  65 static inline void zone_seqlock_init(struct zone *zone)
  66 {
  67         seqlock_init(&zone->span_seqlock);
  68 }
  69 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  70 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  71 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  72 /* VM interface that may be used by firmware interface */
  73 extern int online_pages(unsigned long, unsigned long);
  74 extern void __offline_isolated_pages(unsigned long, unsigned long);
  75
  76 typedef void (*online_page_callback_t)(struct page *page);
  77
  78 extern int set_online_page_callback(online_page_callback_t callback);
  79 extern int restore_online_page_callback(online_page_callback_t callback);
  80
  81 extern void __online_page_set_limits(struct page *page);
  82 extern void __online_page_increment_counters(struct page *page);
  83 extern void __online_page_free(struct page *page);
  84
  85 #ifdef CONFIG_MEMORY_HOTREMOVE
  86 extern bool is_pageblock_removable_nolock(struct page *page);
  87 #endif /* CONFIG_MEMORY_HOTREMOVE */
  88
  89 /* reasonably generic interface to expand the physical pages in a zone  */
  90 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
  91         unsigned long nr_pages);
  92 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
  93         unsigned long nr_pages);
  94
  95 #ifdef CONFIG_NUMA
  96 extern int memory_add_physaddr_to_nid(u64 start);
  97 #else
  98 static inline int memory_add_physaddr_to_nid(u64 start)
  99 {
 100         return 0;
 101 }
 102 #endif
 103
 104 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 105 /*
 106  * For supporting node-hotadd, we have to allocate a new pgdat.
 107  *
 108  * If an arch has generic style NODE_DATA(),
 109  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 110  *
 111  * In general, generic_alloc_nodedata() is used.
 112  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 113  *
 114  */
 115 extern pg_data_t *arch_alloc_nodedata(int nid);
 116 extern void arch_free_nodedata(pg_data_t *pgdat);
 117 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 118
 119 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 120
 121 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 122 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 123
 124 #ifdef CONFIG_NUMA
 125 /*
 126  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 127  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 128  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 129  *      To use new node's memory, more consideration will be necessary.
 130  */
 131 #define generic_alloc_nodedata(nid)                             \
 132 ({                                                              \
 133         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 134 })
 135 /*
 136  * This definition is just for error path in node hotadd.
 137  * For node hotremove, we have to replace this.
 138  */
 139 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 140
 141 extern pg_data_t *node_data[];
 142 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 143 {
 144         node_data[nid] = pgdat;
 145 }
 146
 147 #else /* !CONFIG_NUMA */
 148
 149 /* never called */
 150 static inline pg_data_t *generic_alloc_nodedata(int nid)
 151 {
 152         BUG();
 153         return NULL;
 154 }
 155 static inline void generic_free_nodedata(pg_data_t *pgdat)
 156 {
 157 }
 158 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 159 {
 160 }
 161 #endif /* CONFIG_NUMA */
 162 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 163
 164 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 165 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 166 {
 167 }
 168 static inline void put_page_bootmem(struct page *page)
 169 {
 170 }
 171 #else
 172 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 173 extern void put_page_bootmem(struct page *page);
 174 #endif
 175
 176 /*
 177  * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
 178  * notifier will be called under this. 2) offline/online/add/remove memory
 179  * will not run simultaneously.
 180  */
 181
 182 void lock_memory_hotplug(void);
 183 void unlock_memory_hotplug(void);
 184
 185 #else /* ! CONFIG_MEMORY_HOTPLUG */
 186 /*
 187  * Stub functions for when hotplug is off
 188  */
 189 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 190 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 191 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 192
 193 static inline unsigned zone_span_seqbegin(struct zone *zone)
 194 {
 195         return 0;
 196 }
 197 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 198 {
 199         return 0;
 200 }
 201 static inline void zone_span_writelock(struct zone *zone) {}
 202 static inline void zone_span_writeunlock(struct zone *zone) {}
 203 static inline void zone_seqlock_init(struct zone *zone) {}
 204
 205 static inline int mhp_notimplemented(const char *func)
 206 {
 207         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 208         dump_stack();
 209         return -ENOSYS;
 210 }
 211
 212 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 213 {
 214 }
 215
 216 static inline void lock_memory_hotplug(void) {}
 217 static inline void unlock_memory_hotplug(void) {}
 218
 219 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 220
 221 #ifdef CONFIG_MEMORY_HOTREMOVE
 222
 223 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 224
 225 #else
 226 static inline int is_mem_section_removable(unsigned long pfn,
 227                                         unsigned long nr_pages)
 228 {
 229         return 0;
 230 }
 231 #endif /* CONFIG_MEMORY_HOTREMOVE */
 232
 233 extern int mem_online_node(int nid);
 234 extern int add_memory(int nid, u64 start, u64 size);
 235 extern int arch_add_memory(int nid, u64 start, u64 size);
 236 extern int remove_memory(u64 start, u64 size);
 237 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 238                                                                 int nr_pages);
 239 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 240 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 241                                           unsigned long pnum);
 242
 243 #endif /* __LINUX_MEMORY_HOTPLUG_H */