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;
  14struct resource;
  15
  16#ifdef CONFIG_MEMORY_HOTPLUG
  17
  18/*
  19 * Types for free bootmem stored in page->lru.next. These have to be in
  20 * some random range in unsigned long space for debugging purposes.
  21 */
  22enum {
  23        MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
  24        SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
  25        MIX_SECTION_INFO,
  26        NODE_INFO,
  27        MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
  28};
  29
  30/* Types for control the zone type of onlined and offlined memory */
  31enum {
  32        MMOP_OFFLINE = -1,
  33        MMOP_ONLINE_KEEP,
  34        MMOP_ONLINE_KERNEL,
  35        MMOP_ONLINE_MOVABLE,
  36};
  37
  38/*
  39 * pgdat resizing functions
  40 */
  41static inline
  42void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  43{
  44        spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  45}
  46static inline
  47void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  48{
  49        spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  50}
  51static inline
  52void pgdat_resize_init(struct pglist_data *pgdat)
  53{
  54        spin_lock_init(&pgdat->node_size_lock);
  55}
  56/*
  57 * Zone resizing functions
  58 *
  59 * Note: any attempt to resize a zone should has pgdat_resize_lock()
  60 * zone_span_writelock() both held. This ensure the size of a zone
  61 * can't be changed while pgdat_resize_lock() held.
  62 */
  63static inline unsigned zone_span_seqbegin(struct zone *zone)
  64{
  65        return read_seqbegin(&zone->span_seqlock);
  66}
  67static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  68{
  69        return read_seqretry(&zone->span_seqlock, iv);
  70}
  71static inline void zone_span_writelock(struct zone *zone)
  72{
  73        write_seqlock(&zone->span_seqlock);
  74}
  75static inline void zone_span_writeunlock(struct zone *zone)
  76{
  77        write_sequnlock(&zone->span_seqlock);
  78}
  79static inline void zone_seqlock_init(struct zone *zone)
  80{
  81        seqlock_init(&zone->span_seqlock);
  82}
  83extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  84extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  85extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  86/* VM interface that may be used by firmware interface */
  87extern int online_pages(unsigned long, unsigned long, int);
  88extern int test_pages_in_a_zone(unsigned long, unsigned long);
  89extern void __offline_isolated_pages(unsigned long, unsigned long);
  90
  91typedef void (*online_page_callback_t)(struct page *page);
  92
  93extern int set_online_page_callback(online_page_callback_t callback);
  94extern int restore_online_page_callback(online_page_callback_t callback);
  95
  96extern void __online_page_set_limits(struct page *page);
  97extern void __online_page_increment_counters(struct page *page);
  98extern void __online_page_free(struct page *page);
  99
 100extern int try_online_node(int nid);
 101
 102#ifdef CONFIG_MEMORY_HOTREMOVE
 103extern bool is_pageblock_removable_nolock(struct page *page);
 104extern int arch_remove_memory(u64 start, u64 size);
 105extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
 106        unsigned long nr_pages);
 107#endif /* CONFIG_MEMORY_HOTREMOVE */
 108
 109/* reasonably generic interface to expand the physical pages in a zone  */
 110extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
 111        unsigned long nr_pages);
 112
 113#ifdef CONFIG_NUMA
 114extern int memory_add_physaddr_to_nid(u64 start);
 115#else
 116static inline int memory_add_physaddr_to_nid(u64 start)
 117{
 118        return 0;
 119}
 120#endif
 121
 122#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 123/*
 124 * For supporting node-hotadd, we have to allocate a new pgdat.
 125 *
 126 * If an arch has generic style NODE_DATA(),
 127 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 128 *
 129 * In general, generic_alloc_nodedata() is used.
 130 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 131 *
 132 */
 133extern pg_data_t *arch_alloc_nodedata(int nid);
 134extern void arch_free_nodedata(pg_data_t *pgdat);
 135extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 136
 137#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 138
 139#define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 140#define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 141
 142#ifdef CONFIG_NUMA
 143/*
 144 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 145 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 146 *      Because, pgdat for the new node is not allocated/initialized yet itself.
 147 *      To use new node's memory, more consideration will be necessary.
 148 */
 149#define generic_alloc_nodedata(nid)                             \
 150({                                                              \
 151        kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 152})
 153/*
 154 * This definition is just for error path in node hotadd.
 155 * For node hotremove, we have to replace this.
 156 */
 157#define generic_free_nodedata(pgdat)    kfree(pgdat)
 158
 159extern pg_data_t *node_data[];
 160static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 161{
 162        node_data[nid] = pgdat;
 163}
 164
 165#else /* !CONFIG_NUMA */
 166
 167/* never called */
 168static inline pg_data_t *generic_alloc_nodedata(int nid)
 169{
 170        BUG();
 171        return NULL;
 172}
 173static inline void generic_free_nodedata(pg_data_t *pgdat)
 174{
 175}
 176static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 177{
 178}
 179#endif /* CONFIG_NUMA */
 180#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 181
 182#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
 183extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
 184#else
 185static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 186{
 187}
 188#endif
 189extern void put_page_bootmem(struct page *page);
 190extern void get_page_bootmem(unsigned long ingo, struct page *page,
 191                             unsigned long type);
 192
 193void get_online_mems(void);
 194void put_online_mems(void);
 195
 196void mem_hotplug_begin(void);
 197void mem_hotplug_done(void);
 198
 199#else /* ! CONFIG_MEMORY_HOTPLUG */
 200/*
 201 * Stub functions for when hotplug is off
 202 */
 203static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 204static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 205static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 206
 207static inline unsigned zone_span_seqbegin(struct zone *zone)
 208{
 209        return 0;
 210}
 211static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 212{
 213        return 0;
 214}
 215static inline void zone_span_writelock(struct zone *zone) {}
 216static inline void zone_span_writeunlock(struct zone *zone) {}
 217static inline void zone_seqlock_init(struct zone *zone) {}
 218
 219static inline int mhp_notimplemented(const char *func)
 220{
 221        printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 222        dump_stack();
 223        return -ENOSYS;
 224}
 225
 226static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 227{
 228}
 229
 230static inline int try_online_node(int nid)
 231{
 232        return 0;
 233}
 234
 235static inline void get_online_mems(void) {}
 236static inline void put_online_mems(void) {}
 237
 238static inline void mem_hotplug_begin(void) {}
 239static inline void mem_hotplug_done(void) {}
 240
 241#endif /* ! CONFIG_MEMORY_HOTPLUG */
 242
 243#ifdef CONFIG_MEMORY_HOTREMOVE
 244
 245extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 246extern void try_offline_node(int nid);
 247extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 248extern void remove_memory(int nid, u64 start, u64 size);
 249
 250#else
 251static inline int is_mem_section_removable(unsigned long pfn,
 252                                        unsigned long nr_pages)
 253{
 254        return 0;
 255}
 256
 257static inline void try_offline_node(int nid) {}
 258
 259static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
 260{
 261        return -EINVAL;
 262}
 263
 264static inline void remove_memory(int nid, u64 start, u64 size) {}
 265#endif /* CONFIG_MEMORY_HOTREMOVE */
 266
 267extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
 268                void *arg, int (*func)(struct memory_block *, void *));
 269extern int add_memory(int nid, u64 start, u64 size);
 270extern int add_memory_resource(int nid, struct resource *resource);
 271extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
 272                bool for_device);
 273extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
 274extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 275extern bool is_memblock_offlined(struct memory_block *mem);
 276extern void remove_memory(int nid, u64 start, u64 size);
 277extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
 278extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
 279                unsigned long map_offset);
 280extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 281                                          unsigned long pnum);
 282
 283#endif /* __LINUX_MEMORY_HOTPLUG_H */
 284