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