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 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
  97extern int try_online_node(int nid);
  98
  99#ifdef CONFIG_MEMORY_HOTREMOVE
 100extern bool is_pageblock_removable_nolock(struct page *page);
 101extern int arch_remove_memory(u64 start, u64 size);
 102extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
 103        unsigned long nr_pages);
 104#endif /* CONFIG_MEMORY_HOTREMOVE */
 105
 106/* reasonably generic interface to expand the physical pages in a zone  */
 107extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
 108        unsigned long nr_pages);
 109
 110#ifdef CONFIG_NUMA
 111extern int memory_add_physaddr_to_nid(u64 start);
 112#else
 113static inline int memory_add_physaddr_to_nid(u64 start)
 114{
 115        return 0;
 116}
 117#endif
 118
 119#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 120/*
 121 * For supporting node-hotadd, we have to allocate a new pgdat.
 122 *
 123 * If an arch has generic style NODE_DATA(),
 124 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 125 *
 126 * In general, generic_alloc_nodedata() is used.
 127 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 128 *
 129 */
 130extern pg_data_t *arch_alloc_nodedata(int nid);
 131extern void arch_free_nodedata(pg_data_t *pgdat);
 132extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 133
 134#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 135
 136#define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 137#define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 138
 139#ifdef CONFIG_NUMA
 140/*
 141 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 142 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 143 *      Because, pgdat for the new node is not allocated/initialized yet itself.
 144 *      To use new node's memory, more consideration will be necessary.
 145 */
 146#define generic_alloc_nodedata(nid)                             \
 147({                                                              \
 148        kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 149})
 150/*
 151 * This definition is just for error path in node hotadd.
 152 * For node hotremove, we have to replace this.
 153 */
 154#define generic_free_nodedata(pgdat)    kfree(pgdat)
 155
 156extern pg_data_t *node_data[];
 157static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 158{
 159        node_data[nid] = pgdat;
 160}
 161
 162#else /* !CONFIG_NUMA */
 163
 164/* never called */
 165static inline pg_data_t *generic_alloc_nodedata(int nid)
 166{
 167        BUG();
 168        return NULL;
 169}
 170static inline void generic_free_nodedata(pg_data_t *pgdat)
 171{
 172}
 173static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 174{
 175}
 176#endif /* CONFIG_NUMA */
 177#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 178
 179#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
 180extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 181#else
 182static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 183{
 184}
 185#endif
 186extern void put_page_bootmem(struct page *page);
 187extern void get_page_bootmem(unsigned long ingo, struct page *page,
 188                             unsigned long type);
 189
 190void get_online_mems(void);
 191void put_online_mems(void);
 192
 193#else /* ! CONFIG_MEMORY_HOTPLUG */
 194/*
 195 * Stub functions for when hotplug is off
 196 */
 197static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 198static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 199static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 200
 201static inline unsigned zone_span_seqbegin(struct zone *zone)
 202{
 203        return 0;
 204}
 205static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 206{
 207        return 0;
 208}
 209static inline void zone_span_writelock(struct zone *zone) {}
 210static inline void zone_span_writeunlock(struct zone *zone) {}
 211static inline void zone_seqlock_init(struct zone *zone) {}
 212
 213static inline int mhp_notimplemented(const char *func)
 214{
 215        printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 216        dump_stack();
 217        return -ENOSYS;
 218}
 219
 220static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 221{
 222}
 223
 224static inline int try_online_node(int nid)
 225{
 226        return 0;
 227}
 228
 229static inline void get_online_mems(void) {}
 230static inline void put_online_mems(void) {}
 231
 232#endif /* ! CONFIG_MEMORY_HOTPLUG */
 233
 234#ifdef CONFIG_MEMORY_HOTREMOVE
 235
 236extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 237extern void try_offline_node(int nid);
 238extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 239extern void remove_memory(int nid, u64 start, u64 size);
 240
 241#else
 242static inline int is_mem_section_removable(unsigned long pfn,
 243                                        unsigned long nr_pages)
 244{
 245        return 0;
 246}
 247
 248static inline void try_offline_node(int nid) {}
 249
 250static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
 251{
 252        return -EINVAL;
 253}
 254
 255static inline void remove_memory(int nid, u64 start, u64 size) {}
 256#endif /* CONFIG_MEMORY_HOTREMOVE */
 257
 258extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
 259                void *arg, int (*func)(struct memory_block *, void *));
 260extern int add_memory(int nid, u64 start, u64 size);
 261extern int arch_add_memory(int nid, u64 start, u64 size);
 262extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 263extern bool is_memblock_offlined(struct memory_block *mem);
 264extern void remove_memory(int nid, u64 start, u64 size);
 265extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
 266extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 267extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 268                                          unsigned long pnum);
 269
 270#endif /* __LINUX_MEMORY_HOTPLUG_H */
 271