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 int test_pages_in_a_zone(unsigned long, unsigned long);
  88extern void __offline_isolated_pages(unsigned long, unsigned long);
  89
  90typedef void (*online_page_callback_t)(struct page *page);
  91
  92extern int set_online_page_callback(online_page_callback_t callback);
  93extern int restore_online_page_callback(online_page_callback_t callback);
  94
  95extern void __online_page_set_limits(struct page *page);
  96extern void __online_page_increment_counters(struct page *page);
  97extern void __online_page_free(struct page *page);
  98
  99extern int try_online_node(int nid);
 100
 101#ifdef CONFIG_MEMORY_HOTREMOVE
 102extern bool is_pageblock_removable_nolock(struct page *page);
 103extern int arch_remove_memory(u64 start, u64 size);
 104extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
 105        unsigned long nr_pages);
 106#endif /* CONFIG_MEMORY_HOTREMOVE */
 107
 108/* reasonably generic interface to expand the physical pages in a zone  */
 109extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
 110        unsigned long nr_pages);
 111
 112#ifdef CONFIG_NUMA
 113extern int memory_add_physaddr_to_nid(u64 start);
 114#else
 115static inline int memory_add_physaddr_to_nid(u64 start)
 116{
 117        return 0;
 118}
 119#endif
 120
 121#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 122/*
 123 * For supporting node-hotadd, we have to allocate a new pgdat.
 124 *
 125 * If an arch has generic style NODE_DATA(),
 126 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 127 *
 128 * In general, generic_alloc_nodedata() is used.
 129 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 130 *
 131 */
 132extern pg_data_t *arch_alloc_nodedata(int nid);
 133extern void arch_free_nodedata(pg_data_t *pgdat);
 134extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 135
 136#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 137
 138#define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 139#define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 140
 141#ifdef CONFIG_NUMA
 142/*
 143 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 144 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 145 *      Because, pgdat for the new node is not allocated/initialized yet itself.
 146 *      To use new node's memory, more consideration will be necessary.
 147 */
 148#define generic_alloc_nodedata(nid)                             \
 149({                                                              \
 150        kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 151})
 152/*
 153 * This definition is just for error path in node hotadd.
 154 * For node hotremove, we have to replace this.
 155 */
 156#define generic_free_nodedata(pgdat)    kfree(pgdat)
 157
 158extern pg_data_t *node_data[];
 159static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 160{
 161        node_data[nid] = pgdat;
 162}
 163
 164#else /* !CONFIG_NUMA */
 165
 166/* never called */
 167static inline pg_data_t *generic_alloc_nodedata(int nid)
 168{
 169        BUG();
 170        return NULL;
 171}
 172static inline void generic_free_nodedata(pg_data_t *pgdat)
 173{
 174}
 175static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 176{
 177}
 178#endif /* CONFIG_NUMA */
 179#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 180
 181#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
 182extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 183#else
 184static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 185{
 186}
 187#endif
 188extern void put_page_bootmem(struct page *page);
 189extern void get_page_bootmem(unsigned long ingo, struct page *page,
 190                             unsigned long type);
 191
 192void get_online_mems(void);
 193void put_online_mems(void);
 194
 195#else /* ! CONFIG_MEMORY_HOTPLUG */
 196/*
 197 * Stub functions for when hotplug is off
 198 */
 199static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 200static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 201static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 202
 203static inline unsigned zone_span_seqbegin(struct zone *zone)
 204{
 205        return 0;
 206}
 207static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 208{
 209        return 0;
 210}
 211static inline void zone_span_writelock(struct zone *zone) {}
 212static inline void zone_span_writeunlock(struct zone *zone) {}
 213static inline void zone_seqlock_init(struct zone *zone) {}
 214
 215static inline int mhp_notimplemented(const char *func)
 216{
 217        printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 218        dump_stack();
 219        return -ENOSYS;
 220}
 221
 222static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 223{
 224}
 225
 226static inline int try_online_node(int nid)
 227{
 228        return 0;
 229}
 230
 231static inline void get_online_mems(void) {}
 232static inline void put_online_mems(void) {}
 233
 234#endif /* ! CONFIG_MEMORY_HOTPLUG */
 235
 236#ifdef CONFIG_MEMORY_HOTREMOVE
 237
 238extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 239extern void try_offline_node(int nid);
 240extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 241extern void remove_memory(int nid, u64 start, u64 size);
 242
 243#else
 244static inline int is_mem_section_removable(unsigned long pfn,
 245                                        unsigned long nr_pages)
 246{
 247        return 0;
 248}
 249
 250static inline void try_offline_node(int nid) {}
 251
 252static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
 253{
 254        return -EINVAL;
 255}
 256
 257static inline void remove_memory(int nid, u64 start, u64 size) {}
 258#endif /* CONFIG_MEMORY_HOTREMOVE */
 259
 260extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
 261                void *arg, int (*func)(struct memory_block *, void *));
 262extern int add_memory(int nid, u64 start, u64 size);
 263extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default);
 264extern int arch_add_memory(int nid, u64 start, u64 size);
 265extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 266extern bool is_memblock_offlined(struct memory_block *mem);
 267extern void remove_memory(int nid, u64 start, u64 size);
 268extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
 269extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
 270extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 271                                          unsigned long pnum);
 272
 273#endif /* __LINUX_MEMORY_HOTPLUG_H */
 274