linux/include/linux/memory_hotplug.h
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   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 memory */
  30enum {
  31        ONLINE_KEEP,
  32        ONLINE_KERNEL,
  33        ONLINE_MOVABLE,
  34};
  35
  36/*
  37 * pgdat resizing functions
  38 */
  39static inline
  40void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  41{
  42        spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  43}
  44static inline
  45void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  46{
  47        spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  48}
  49static inline
  50void pgdat_resize_init(struct pglist_data *pgdat)
  51{
  52        spin_lock_init(&pgdat->node_size_lock);
  53}
  54/*
  55 * Zone resizing functions
  56 *
  57 * Note: any attempt to resize a zone should has pgdat_resize_lock()
  58 * zone_span_writelock() both held. This ensure the size of a zone
  59 * can't be changed while pgdat_resize_lock() held.
  60 */
  61static inline unsigned zone_span_seqbegin(struct zone *zone)
  62{
  63        return read_seqbegin(&zone->span_seqlock);
  64}
  65static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  66{
  67        return read_seqretry(&zone->span_seqlock, iv);
  68}
  69static inline void zone_span_writelock(struct zone *zone)
  70{
  71        write_seqlock(&zone->span_seqlock);
  72}
  73static inline void zone_span_writeunlock(struct zone *zone)
  74{
  75        write_sequnlock(&zone->span_seqlock);
  76}
  77static inline void zone_seqlock_init(struct zone *zone)
  78{
  79        seqlock_init(&zone->span_seqlock);
  80}
  81extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  82extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  83extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  84/* VM interface that may be used by firmware interface */
  85extern int online_pages(unsigned long, unsigned long, int);
  86extern void __offline_isolated_pages(unsigned long, unsigned long);
  87
  88typedef void (*online_page_callback_t)(struct page *page);
  89
  90extern int set_online_page_callback(online_page_callback_t callback);
  91extern int restore_online_page_callback(online_page_callback_t callback);
  92
  93extern void __online_page_set_limits(struct page *page);
  94extern void __online_page_increment_counters(struct page *page);
  95extern void __online_page_free(struct page *page);
  96
  97#ifdef CONFIG_MEMORY_HOTREMOVE
  98extern bool is_pageblock_removable_nolock(struct page *page);
  99#endif /* CONFIG_MEMORY_HOTREMOVE */
 100
 101/* reasonably generic interface to expand the physical pages in a zone  */
 102extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
 103        unsigned long nr_pages);
 104extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
 105        unsigned long nr_pages);
 106
 107#ifdef CONFIG_NUMA
 108extern int memory_add_physaddr_to_nid(u64 start);
 109#else
 110static inline int memory_add_physaddr_to_nid(u64 start)
 111{
 112        return 0;
 113}
 114#endif
 115
 116#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 117/*
 118 * For supporting node-hotadd, we have to allocate a new pgdat.
 119 *
 120 * If an arch has generic style NODE_DATA(),
 121 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 122 *
 123 * In general, generic_alloc_nodedata() is used.
 124 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 125 *
 126 */
 127extern pg_data_t *arch_alloc_nodedata(int nid);
 128extern void arch_free_nodedata(pg_data_t *pgdat);
 129extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 130
 131#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 132
 133#define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 134#define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 135
 136#ifdef CONFIG_NUMA
 137/*
 138 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 139 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 140 *      Because, pgdat for the new node is not allocated/initialized yet itself.
 141 *      To use new node's memory, more consideration will be necessary.
 142 */
 143#define generic_alloc_nodedata(nid)                             \
 144({                                                              \
 145        kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 146})
 147/*
 148 * This definition is just for error path in node hotadd.
 149 * For node hotremove, we have to replace this.
 150 */
 151#define generic_free_nodedata(pgdat)    kfree(pgdat)
 152
 153extern pg_data_t *node_data[];
 154static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 155{
 156        node_data[nid] = pgdat;
 157}
 158
 159#else /* !CONFIG_NUMA */
 160
 161/* never called */
 162static inline pg_data_t *generic_alloc_nodedata(int nid)
 163{
 164        BUG();
 165        return NULL;
 166}
 167static inline void generic_free_nodedata(pg_data_t *pgdat)
 168{
 169}
 170static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 171{
 172}
 173#endif /* CONFIG_NUMA */
 174#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 175
 176#ifdef CONFIG_SPARSEMEM_VMEMMAP
 177static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 178{
 179}
 180static inline void put_page_bootmem(struct page *page)
 181{
 182}
 183#else
 184extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 185extern void put_page_bootmem(struct page *page);
 186#endif
 187
 188/*
 189 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
 190 * notifier will be called under this. 2) offline/online/add/remove memory
 191 * will not run simultaneously.
 192 */
 193
 194void lock_memory_hotplug(void);
 195void unlock_memory_hotplug(void);
 196
 197#else /* ! CONFIG_MEMORY_HOTPLUG */
 198/*
 199 * Stub functions for when hotplug is off
 200 */
 201static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 202static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 203static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 204
 205static inline unsigned zone_span_seqbegin(struct zone *zone)
 206{
 207        return 0;
 208}
 209static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 210{
 211        return 0;
 212}
 213static inline void zone_span_writelock(struct zone *zone) {}
 214static inline void zone_span_writeunlock(struct zone *zone) {}
 215static inline void zone_seqlock_init(struct zone *zone) {}
 216
 217static inline int mhp_notimplemented(const char *func)
 218{
 219        printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 220        dump_stack();
 221        return -ENOSYS;
 222}
 223
 224static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 225{
 226}
 227
 228static inline void lock_memory_hotplug(void) {}
 229static inline void unlock_memory_hotplug(void) {}
 230
 231#endif /* ! CONFIG_MEMORY_HOTPLUG */
 232
 233#ifdef CONFIG_MEMORY_HOTREMOVE
 234
 235extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 236
 237#else
 238static inline int is_mem_section_removable(unsigned long pfn,
 239                                        unsigned long nr_pages)
 240{
 241        return 0;
 242}
 243#endif /* CONFIG_MEMORY_HOTREMOVE */
 244
 245extern int mem_online_node(int nid);
 246extern int add_memory(int nid, u64 start, u64 size);
 247extern int arch_add_memory(int nid, u64 start, u64 size);
 248extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 249extern int offline_memory_block(struct memory_block *mem);
 250extern int remove_memory(u64 start, u64 size);
 251extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 252                                                                int nr_pages);
 253extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 254extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 255                                          unsigned long pnum);
 256
 257#endif /* __LINUX_MEMORY_HOTPLUG_H */
 258
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