LXR linux/include/linux/memory

   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
   9struct page;
  10struct zone;
  11struct pglist_data;
  12struct mem_section;
  13struct memory_block;
  14
  15#ifdef CONFIG_MEMORY_HOTPLUG
  16
  17/*
  18 * Types for free bootmem stored in page->lru.next. These have to be in
  19 * some random range in unsigned long space for debugging purposes.
  20 */
  21enum {
  22        MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
  23        SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
  24        MIX_SECTION_INFO,
  25        NODE_INFO,
  26        MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
  27};
  28
  29/* Types for control the zone type of onlined and offlined memory */
  30enum {
  31        MMOP_OFFLINE = -1,
  32        MMOP_ONLINE_KEEP,
  33        MMOP_ONLINE_KERNEL,
  34        MMOP_ONLINE_MOVABLE,
  35};
  36
  37/*
  38 * pgdat resizing functions
  39 */
  40static inline
  41void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  42{
  43        spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  44}
  45static inline
  46void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  47{
  48        spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  49}
  50static inline
  51void pgdat_resize_init(struct pglist_data *pgdat)
  52{
  53        spin_lock_init(&pgdat->node_size_lock);
  54}
  55/*
  56 * Zone resizing functions
  57 *
  58 * Note: any attempt to resize a zone should has pgdat_resize_lock()
  59 * zone_span_writelock() both held. This ensure the size of a zone
  60 * can't be changed while pgdat_resize_lock() held.
  61 */
  62static inline unsigned zone_span_seqbegin(struct zone *zone)
  63{
  64        return read_seqbegin(&zone->span_seqlock);
  65}
  66static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  67{
  68        return read_seqretry(&zone->span_seqlock, iv);
  69}
  70static inline void zone_span_writelock(struct zone *zone)
  71{
  72        write_seqlock(&zone->span_seqlock);
  73}
  74static inline void zone_span_writeunlock(struct zone *zone)
  75{
  76        write_sequnlock(&zone->span_seqlock);
  77}
  78static inline void zone_seqlock_init(struct zone *zone)
  79{
  80        seqlock_init(&zone->span_seqlock);
  81}
  82extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  83extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  84extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  85/* VM interface that may be used by firmware interface */
  86extern int online_pages(unsigned long, unsigned long, int);
  87extern void __offline_isolated_pages(unsigned long, unsigned long);
  88
  89typedef void (*online_page_callback_t)(struct page *page);
  90
  91extern int set_online_page_callback(online_page_callback_t callback);
  92extern int restore_online_page_callback(online_page_callback_t callback);
  93
  94extern void __online_page_set_limits(struct page *page);
  95extern void __online_page_increment_counters(struct page *page);
  96extern void __online_page_free(struct page *page);
  97
  98extern int try_online_node(int nid);
  99
 100#ifdef CONFIG_MEMORY_HOTREMOVE
 101extern bool is_pageblock_removable_nolock(struct page *page);
 102extern int arch_remove_memory(u64 start, u64 size);
 103extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
 104        unsigned long nr_pages);
 105#endif /* CONFIG_MEMORY_HOTREMOVE */
 106
 107/* reasonably generic interface to expand the physical pages in a zone  */
 108extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
 109        unsigned long nr_pages);
 110
 111#ifdef CONFIG_NUMA
 112extern int memory_add_physaddr_to_nid(u64 start);
 113#else
 114static inline int memory_add_physaddr_to_nid(u64 start)
 115{
 116        return 0;
 117}
 118#endif
 119
 120#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 121/*
 122 * For supporting node-hotadd, we have to allocate a new pgdat.
 123 *
 124 * If an arch has generic style NODE_DATA(),
 125 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 126 *
 127 * In general, generic_alloc_nodedata() is used.
 128 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 129 *
 130 */
 131extern pg_data_t *arch_alloc_nodedata(int nid);
 132extern void arch_free_nodedata(pg_data_t *pgdat);
 133extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 134
 135#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 136
 137#define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 138#define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 139
 140#ifdef CONFIG_NUMA
 141/*
 142 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 143 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 144 *      Because, pgdat for the new node is not allocated/initialized yet itself.
 145 *      To use new node's memory, more consideration will be necessary.
 146 */
 147#define generic_alloc_nodedata(nid)                             \
 148({                                                              \
 149        kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 150})
 151/*
 152 * This definition is just for error path in node hotadd.
 153 * For node hotremove, we have to replace this.
 154 */
 155#define generic_free_nodedata(pgdat)    kfree(pgdat)
 156
 157extern pg_data_t *node_data[];
 158static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 159{
 160        node_data[nid] = pgdat;
 161}
 162
 163#else /* !CONFIG_NUMA */
 164
 165/* never called */
 166static inline pg_data_t *generic_alloc_nodedata(int nid)
 167{
 168        BUG();
 169        return NULL;
 170}
 171static inline void generic_free_nodedata(pg_data_t *pgdat)
 172{
 173}
 174static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 175{
 176}
 177#endif /* CONFIG_NUMA */
 178#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 179
 180#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
 181extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 182#else
 183static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 184{
 185}
 186#endif
 187extern void put_page_bootmem(struct page *page);
 188extern void get_page_bootmem(unsigned long ingo, struct page *page,
 189                             unsigned long type);
 190
 191void get_online_mems(void);
 192void put_online_mems(void);
 193
 194#else /* ! CONFIG_MEMORY_HOTPLUG */
 195/*
 196 * Stub functions for when hotplug is off
 197 */
 198static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 199static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 200static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 201
 202static inline unsigned zone_span_seqbegin(struct zone *zone)
 203{
 204        return 0;
 205}
 206static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 207{
 208        return 0;
 209}
 210static inline void zone_span_writelock(struct zone *zone) {}
 211static inline void zone_span_writeunlock(struct zone *zone) {}
 212static inline void zone_seqlock_init(struct zone *zone) {}
 213
 214static inline int mhp_notimplemented(const char *func)
 215{
 216        printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 217        dump_stack();
 218        return -ENOSYS;
 219}
 220
 221static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 222{
 223}
 224
 225static inline int try_online_node(int nid)
 226{
 227        return 0;
 228}
 229
 230static inline void get_online_mems(void) {}
 231static inline void put_online_mems(void) {}
 232
 233#endif /* ! CONFIG_MEMORY_HOTPLUG */
 234
 235#ifdef CONFIG_MEMORY_HOTREMOVE
 236
 237extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 238extern void try_offline_node(int nid);
 239extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 240extern void remove_memory(int nid, u64 start, u64 size);
 241
 242#else
 243static inline int is_mem_section_removable(unsigned long pfn,
 244                                        unsigned long nr_pages)
 245{
 246        return 0;
 247}
 248
 249static inline void try_offline_node(int nid) {}
 250
 251static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
 252{
 253        return -EINVAL;
 254}
 255
 256static inline void remove_memory(int nid, u64 start, u64 size) {}
 257#endif /* CONFIG_MEMORY_HOTREMOVE */
 258
 259extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
 260                void *arg, int (*func)(struct memory_block *, void *));
 261extern int add_memory(int nid, u64 start, u64 size);
 262extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default);
 263extern int arch_add_memory(int nid, u64 start, u64 size);
 264extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 265extern bool is_memblock_offlined(struct memory_block *mem);
 266extern void remove_memory(int nid, u64 start, u64 size);
 267extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
 268extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 269extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 270                                          unsigned long pnum);
 271
 272#endif /* __LINUX_MEMORY_HOTPLUG_H */
 273