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 struct memory_block;
  14 struct resource;
  15
  16 #ifdef CONFIG_MEMORY_HOTPLUG
  17
  18 /*
  19  * Types for free bootmem stored in page->lru.next. These have to be in
  20  * some random range in unsigned long space for debugging purposes.
  21  */
  22 enum {
  23         MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
  24         SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
  25         MIX_SECTION_INFO,
  26         NODE_INFO,
  27         MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
  28 };
  29
  30 /* Types for control the zone type of onlined and offlined memory */
  31 enum {
  32         MMOP_OFFLINE = -1,
  33         MMOP_ONLINE_KEEP,
  34         MMOP_ONLINE_KERNEL,
  35         MMOP_ONLINE_MOVABLE,
  36 };
  37
  38 /*
  39  * pgdat resizing functions
  40  */
  41 static inline
  42 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  43 {
  44         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  45 }
  46 static inline
  47 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  48 {
  49         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  50 }
  51 static inline
  52 void pgdat_resize_init(struct pglist_data *pgdat)
  53 {
  54         spin_lock_init(&pgdat->node_size_lock);
  55 }
  56 /*
  57  * Zone resizing functions
  58  *
  59  * Note: any attempt to resize a zone should has pgdat_resize_lock()
  60  * zone_span_writelock() both held. This ensure the size of a zone
  61  * can't be changed while pgdat_resize_lock() held.
  62  */
  63 static inline unsigned zone_span_seqbegin(struct zone *zone)
  64 {
  65         return read_seqbegin(&zone->span_seqlock);
  66 }
  67 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  68 {
  69         return read_seqretry(&zone->span_seqlock, iv);
  70 }
  71 static inline void zone_span_writelock(struct zone *zone)
  72 {
  73         write_seqlock(&zone->span_seqlock);
  74 }
  75 static inline void zone_span_writeunlock(struct zone *zone)
  76 {
  77         write_sequnlock(&zone->span_seqlock);
  78 }
  79 static inline void zone_seqlock_init(struct zone *zone)
  80 {
  81         seqlock_init(&zone->span_seqlock);
  82 }
  83 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  84 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  85 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  86 /* VM interface that may be used by firmware interface */
  87 extern int online_pages(unsigned long, unsigned long, int);
  88 extern int test_pages_in_a_zone(unsigned long, unsigned long);
  89 extern void __offline_isolated_pages(unsigned long, unsigned long);
  90
  91 typedef void (*online_page_callback_t)(struct page *page);
  92
  93 extern int set_online_page_callback(online_page_callback_t callback);
  94 extern int restore_online_page_callback(online_page_callback_t callback);
  95
  96 extern void __online_page_set_limits(struct page *page);
  97 extern void __online_page_increment_counters(struct page *page);
  98 extern void __online_page_free(struct page *page);
  99
 100 extern int try_online_node(int nid);
 101
 102 extern bool memhp_auto_online;
 103
 104 #ifdef CONFIG_MEMORY_HOTREMOVE
 105 extern bool is_pageblock_removable_nolock(struct page *page);
 106 extern int arch_remove_memory(u64 start, u64 size);
 107 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
 108         unsigned long nr_pages);
 109 #endif /* CONFIG_MEMORY_HOTREMOVE */
 110
 111 /* reasonably generic interface to expand the physical pages in a zone  */
 112 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
 113         unsigned long nr_pages);
 114
 115 #ifdef CONFIG_NUMA
 116 extern int memory_add_physaddr_to_nid(u64 start);
 117 #else
 118 static inline int memory_add_physaddr_to_nid(u64 start)
 119 {
 120         return 0;
 121 }
 122 #endif
 123
 124 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 125 /*
 126  * For supporting node-hotadd, we have to allocate a new pgdat.
 127  *
 128  * If an arch has generic style NODE_DATA(),
 129  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 130  *
 131  * In general, generic_alloc_nodedata() is used.
 132  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 133  *
 134  */
 135 extern pg_data_t *arch_alloc_nodedata(int nid);
 136 extern void arch_free_nodedata(pg_data_t *pgdat);
 137 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 138
 139 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 140
 141 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 142 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 143
 144 #ifdef CONFIG_NUMA
 145 /*
 146  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 147  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 148  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 149  *      To use new node's memory, more consideration will be necessary.
 150  */
 151 #define generic_alloc_nodedata(nid)                             \
 152 ({                                                              \
 153         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 154 })
 155 /*
 156  * This definition is just for error path in node hotadd.
 157  * For node hotremove, we have to replace this.
 158  */
 159 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 160
 161 extern pg_data_t *node_data[];
 162 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 163 {
 164         node_data[nid] = pgdat;
 165 }
 166
 167 #else /* !CONFIG_NUMA */
 168
 169 /* never called */
 170 static inline pg_data_t *generic_alloc_nodedata(int nid)
 171 {
 172         BUG();
 173         return NULL;
 174 }
 175 static inline void generic_free_nodedata(pg_data_t *pgdat)
 176 {
 177 }
 178 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 179 {
 180 }
 181 #endif /* CONFIG_NUMA */
 182 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 183
 184 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
 185 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 186 #else
 187 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 188 {
 189 }
 190 #endif
 191 extern void put_page_bootmem(struct page *page);
 192 extern void get_page_bootmem(unsigned long ingo, struct page *page,
 193                              unsigned long type);
 194
 195 void get_online_mems(void);
 196 void put_online_mems(void);
 197
 198 void mem_hotplug_begin(void);
 199 void mem_hotplug_done(void);
 200
 201 extern void set_zone_contiguous(struct zone *zone);
 202 extern void clear_zone_contiguous(struct zone *zone);
 203
 204 #else /* ! CONFIG_MEMORY_HOTPLUG */
 205 /*
 206  * Stub functions for when hotplug is off
 207  */
 208 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 209 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 210 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 211
 212 static inline unsigned zone_span_seqbegin(struct zone *zone)
 213 {
 214         return 0;
 215 }
 216 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 217 {
 218         return 0;
 219 }
 220 static inline void zone_span_writelock(struct zone *zone) {}
 221 static inline void zone_span_writeunlock(struct zone *zone) {}
 222 static inline void zone_seqlock_init(struct zone *zone) {}
 223
 224 static inline int mhp_notimplemented(const char *func)
 225 {
 226         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 227         dump_stack();
 228         return -ENOSYS;
 229 }
 230
 231 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 232 {
 233 }
 234
 235 static inline int try_online_node(int nid)
 236 {
 237         return 0;
 238 }
 239
 240 static inline void get_online_mems(void) {}
 241 static inline void put_online_mems(void) {}
 242
 243 static inline void mem_hotplug_begin(void) {}
 244 static inline void mem_hotplug_done(void) {}
 245
 246 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 247
 248 #ifdef CONFIG_MEMORY_HOTREMOVE
 249
 250 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 251 extern void try_offline_node(int nid);
 252 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 253 extern void remove_memory(int nid, u64 start, u64 size);
 254
 255 #else
 256 static inline int is_mem_section_removable(unsigned long pfn,
 257                                         unsigned long nr_pages)
 258 {
 259         return 0;
 260 }
 261
 262 static inline void try_offline_node(int nid) {}
 263
 264 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
 265 {
 266         return -EINVAL;
 267 }
 268
 269 static inline void remove_memory(int nid, u64 start, u64 size) {}
 270 #endif /* CONFIG_MEMORY_HOTREMOVE */
 271
 272 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
 273                 void *arg, int (*func)(struct memory_block *, void *));
 274 extern int add_memory(int nid, u64 start, u64 size);
 275 extern int add_memory_resource(int nid, struct resource *resource, bool online);
 276 extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
 277                 bool for_device);
 278 extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
 279 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 280 extern bool is_memblock_offlined(struct memory_block *mem);
 281 extern void remove_memory(int nid, u64 start, u64 size);
 282 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
 283 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
 284                 unsigned long map_offset);
 285 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 286                                           unsigned long pnum);
 287
 288 #endif /* __LINUX_MEMORY_HOTPLUG_H */