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
   8struct page;
   9struct zone;
  10struct pglist_data;
  11struct mem_section;
  12
  13#ifdef CONFIG_MEMORY_HOTPLUG
  14
  15/*
  16 * Types for free bootmem.
  17 * The normal smallest mapcount is -1. Here is smaller value than it.
  18 */
  19#define SECTION_INFO            (-1 - 1)
  20#define MIX_SECTION_INFO        (-1 - 2)
  21#define NODE_INFO               (-1 - 3)
  22
  23/*
  24 * pgdat resizing functions
  25 */
  26static inline
  27void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  28{
  29        spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  30}
  31static inline
  32void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  33{
  34        spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  35}
  36static inline
  37void pgdat_resize_init(struct pglist_data *pgdat)
  38{
  39        spin_lock_init(&pgdat->node_size_lock);
  40}
  41/*
  42 * Zone resizing functions
  43 */
  44static inline unsigned zone_span_seqbegin(struct zone *zone)
  45{
  46        return read_seqbegin(&zone->span_seqlock);
  47}
  48static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  49{
  50        return read_seqretry(&zone->span_seqlock, iv);
  51}
  52static inline void zone_span_writelock(struct zone *zone)
  53{
  54        write_seqlock(&zone->span_seqlock);
  55}
  56static inline void zone_span_writeunlock(struct zone *zone)
  57{
  58        write_sequnlock(&zone->span_seqlock);
  59}
  60static inline void zone_seqlock_init(struct zone *zone)
  61{
  62        seqlock_init(&zone->span_seqlock);
  63}
  64extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  65extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  66extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  67/* need some defines for these for archs that don't support it */
  68extern void online_page(struct page *page);
  69/* VM interface that may be used by firmware interface */
  70extern int online_pages(unsigned long, unsigned long);
  71extern void __offline_isolated_pages(unsigned long, unsigned long);
  72extern int offline_pages(unsigned long, unsigned long, unsigned long);
  73
  74/* reasonably generic interface to expand the physical pages in a zone  */
  75extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
  76        unsigned long nr_pages);
  77extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
  78        unsigned long nr_pages);
  79
  80#ifdef CONFIG_NUMA
  81extern int memory_add_physaddr_to_nid(u64 start);
  82#else
  83static inline int memory_add_physaddr_to_nid(u64 start)
  84{
  85        return 0;
  86}
  87#endif
  88
  89#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
  90/*
  91 * For supporting node-hotadd, we have to allocate a new pgdat.
  92 *
  93 * If an arch has generic style NODE_DATA(),
  94 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
  95 *
  96 * In general, generic_alloc_nodedata() is used.
  97 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
  98 *
  99 */
 100extern pg_data_t *arch_alloc_nodedata(int nid);
 101extern void arch_free_nodedata(pg_data_t *pgdat);
 102extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 103
 104#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 105
 106#define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 107#define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 108
 109#ifdef CONFIG_NUMA
 110/*
 111 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 112 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 113 *      Because, pgdat for the new node is not allocated/initialized yet itself.
 114 *      To use new node's memory, more consideration will be necessary.
 115 */
 116#define generic_alloc_nodedata(nid)                             \
 117({                                                              \
 118        kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 119})
 120/*
 121 * This definition is just for error path in node hotadd.
 122 * For node hotremove, we have to replace this.
 123 */
 124#define generic_free_nodedata(pgdat)    kfree(pgdat)
 125
 126extern pg_data_t *node_data[];
 127static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 128{
 129        node_data[nid] = pgdat;
 130}
 131
 132#else /* !CONFIG_NUMA */
 133
 134/* never called */
 135static inline pg_data_t *generic_alloc_nodedata(int nid)
 136{
 137        BUG();
 138        return NULL;
 139}
 140static inline void generic_free_nodedata(pg_data_t *pgdat)
 141{
 142}
 143static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 144{
 145}
 146#endif /* CONFIG_NUMA */
 147#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 148
 149#ifdef CONFIG_SPARSEMEM_VMEMMAP
 150static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 151{
 152}
 153static inline void put_page_bootmem(struct page *page)
 154{
 155}
 156#else
 157extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 158extern void put_page_bootmem(struct page *page);
 159#endif
 160
 161#else /* ! CONFIG_MEMORY_HOTPLUG */
 162/*
 163 * Stub functions for when hotplug is off
 164 */
 165static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 166static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 167static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 168
 169static inline unsigned zone_span_seqbegin(struct zone *zone)
 170{
 171        return 0;
 172}
 173static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 174{
 175        return 0;
 176}
 177static inline void zone_span_writelock(struct zone *zone) {}
 178static inline void zone_span_writeunlock(struct zone *zone) {}
 179static inline void zone_seqlock_init(struct zone *zone) {}
 180
 181static inline int mhp_notimplemented(const char *func)
 182{
 183        printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 184        dump_stack();
 185        return -ENOSYS;
 186}
 187
 188static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 189{
 190}
 191
 192#endif /* ! CONFIG_MEMORY_HOTPLUG */
 193
 194#ifdef CONFIG_MEMORY_HOTREMOVE
 195
 196extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 197
 198#else
 199static inline int is_mem_section_removable(unsigned long pfn,
 200                                        unsigned long nr_pages)
 201{
 202        return 0;
 203}
 204#endif /* CONFIG_MEMORY_HOTREMOVE */
 205
 206extern int add_memory(int nid, u64 start, u64 size);
 207extern int arch_add_memory(int nid, u64 start, u64 size);
 208extern int remove_memory(u64 start, u64 size);
 209extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 210                                                                int nr_pages);
 211extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 212extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 213                                          unsigned long pnum);
 214
 215#endif /* __LINUX_MEMORY_HOTPLUG_H */
 216