include/linux/memory_hotplug.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LINUX_MEMORY_HOTPLUG_H
   3 #define __LINUX_MEMORY_HOTPLUG_H
   4
   5 #include <linux/mmzone.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/notifier.h>
   8 #include <linux/bug.h>
   9
  10 struct page;
  11 struct zone;
  12 struct pglist_data;
  13 struct mem_section;
  14 struct memory_block;
  15 struct resource;
  16 struct vmem_altmap;
  17
  18 #ifdef CONFIG_MEMORY_HOTPLUG
  19 /*
  20  * Return page for the valid pfn only if the page is online. All pfn
  21  * walkers which rely on the fully initialized page->flags and others
  22  * should use this rather than pfn_valid && pfn_to_page
  23  */
  24 #define pfn_to_online_page(pfn)                         \
  25 ({                                                      \
  26         struct page *___page = NULL;                    \
  27         unsigned long ___nr = pfn_to_section_nr(pfn);   \
  28                                                         \
  29         if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\
  30                 ___page = pfn_to_page(pfn);             \
  31         ___page;                                        \
  32 })
  33
  34 /*
  35  * Types for free bootmem stored in page->lru.next. These have to be in
  36  * some random range in unsigned long space for debugging purposes.
  37  */
  38 enum {
  39         MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
  40         SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
  41         MIX_SECTION_INFO,
  42         NODE_INFO,
  43         MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
  44 };
  45
  46 /* Types for control the zone type of onlined and offlined memory */
  47 enum {
  48         MMOP_OFFLINE = -1,
  49         MMOP_ONLINE_KEEP,
  50         MMOP_ONLINE_KERNEL,
  51         MMOP_ONLINE_MOVABLE,
  52 };
  53
  54 /*
  55  * pgdat resizing functions
  56  */
  57 static inline
  58 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  59 {
  60         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  61 }
  62 static inline
  63 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  64 {
  65         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  66 }
  67 static inline
  68 void pgdat_resize_init(struct pglist_data *pgdat)
  69 {
  70         spin_lock_init(&pgdat->node_size_lock);
  71 }
  72 /*
  73  * Zone resizing functions
  74  *
  75  * Note: any attempt to resize a zone should has pgdat_resize_lock()
  76  * zone_span_writelock() both held. This ensure the size of a zone
  77  * can't be changed while pgdat_resize_lock() held.
  78  */
  79 static inline unsigned zone_span_seqbegin(struct zone *zone)
  80 {
  81         return read_seqbegin(&zone->span_seqlock);
  82 }
  83 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  84 {
  85         return read_seqretry(&zone->span_seqlock, iv);
  86 }
  87 static inline void zone_span_writelock(struct zone *zone)
  88 {
  89         write_seqlock(&zone->span_seqlock);
  90 }
  91 static inline void zone_span_writeunlock(struct zone *zone)
  92 {
  93         write_sequnlock(&zone->span_seqlock);
  94 }
  95 static inline void zone_seqlock_init(struct zone *zone)
  96 {
  97         seqlock_init(&zone->span_seqlock);
  98 }
  99 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
 100 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
 101 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
 102 /* VM interface that may be used by firmware interface */
 103 extern int online_pages(unsigned long, unsigned long, int);
 104 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
 105         unsigned long *valid_start, unsigned long *valid_end);
 106 extern void __offline_isolated_pages(unsigned long, unsigned long);
 107
 108 typedef void (*online_page_callback_t)(struct page *page);
 109
 110 extern int set_online_page_callback(online_page_callback_t callback);
 111 extern int restore_online_page_callback(online_page_callback_t callback);
 112
 113 extern void __online_page_set_limits(struct page *page);
 114 extern void __online_page_increment_counters(struct page *page);
 115 extern void __online_page_free(struct page *page);
 116
 117 extern int try_online_node(int nid);
 118
 119 extern bool memhp_auto_online;
 120 /* If movable_node boot option specified */
 121 extern bool movable_node_enabled;
 122 static inline bool movable_node_is_enabled(void)
 123 {
 124         return movable_node_enabled;
 125 }
 126
 127 #ifdef CONFIG_MEMORY_HOTREMOVE
 128 extern bool is_pageblock_removable_nolock(struct page *page);
 129 extern int arch_remove_memory(u64 start, u64 size,
 130                 struct vmem_altmap *altmap);
 131 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
 132         unsigned long nr_pages, struct vmem_altmap *altmap);
 133 #endif /* CONFIG_MEMORY_HOTREMOVE */
 134
 135 /* reasonably generic interface to expand the physical pages */
 136 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
 137                 struct vmem_altmap *altmap, bool want_memblock);
 138
 139 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
 140 static inline int add_pages(int nid, unsigned long start_pfn,
 141                 unsigned long nr_pages, struct vmem_altmap *altmap,
 142                 bool want_memblock)
 143 {
 144         return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
 145 }
 146 #else /* ARCH_HAS_ADD_PAGES */
 147 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
 148                 struct vmem_altmap *altmap, bool want_memblock);
 149 #endif /* ARCH_HAS_ADD_PAGES */
 150
 151 #ifdef CONFIG_NUMA
 152 extern int memory_add_physaddr_to_nid(u64 start);
 153 #else
 154 static inline int memory_add_physaddr_to_nid(u64 start)
 155 {
 156         return 0;
 157 }
 158 #endif
 159
 160 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
 161 /*
 162  * For supporting node-hotadd, we have to allocate a new pgdat.
 163  *
 164  * If an arch has generic style NODE_DATA(),
 165  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 166  *
 167  * In general, generic_alloc_nodedata() is used.
 168  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 169  *
 170  */
 171 extern pg_data_t *arch_alloc_nodedata(int nid);
 172 extern void arch_free_nodedata(pg_data_t *pgdat);
 173 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 174
 175 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 176
 177 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
 178 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
 179
 180 #ifdef CONFIG_NUMA
 181 /*
 182  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 183  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 184  *      Because, pgdat for the new node is not allocated/initialized yet itself.
 185  *      To use new node's memory, more consideration will be necessary.
 186  */
 187 #define generic_alloc_nodedata(nid)                             \
 188 ({                                                              \
 189         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
 190 })
 191 /*
 192  * This definition is just for error path in node hotadd.
 193  * For node hotremove, we have to replace this.
 194  */
 195 #define generic_free_nodedata(pgdat)    kfree(pgdat)
 196
 197 extern pg_data_t *node_data[];
 198 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 199 {
 200         node_data[nid] = pgdat;
 201 }
 202
 203 #else /* !CONFIG_NUMA */
 204
 205 /* never called */
 206 static inline pg_data_t *generic_alloc_nodedata(int nid)
 207 {
 208         BUG();
 209         return NULL;
 210 }
 211 static inline void generic_free_nodedata(pg_data_t *pgdat)
 212 {
 213 }
 214 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 215 {
 216 }
 217 #endif /* CONFIG_NUMA */
 218 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
 219
 220 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
 221 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
 222 #else
 223 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 224 {
 225 }
 226 #endif
 227 extern void put_page_bootmem(struct page *page);
 228 extern void get_page_bootmem(unsigned long ingo, struct page *page,
 229                              unsigned long type);
 230
 231 void get_online_mems(void);
 232 void put_online_mems(void);
 233
 234 void mem_hotplug_begin(void);
 235 void mem_hotplug_done(void);
 236
 237 extern void set_zone_contiguous(struct zone *zone);
 238 extern void clear_zone_contiguous(struct zone *zone);
 239
 240 #else /* ! CONFIG_MEMORY_HOTPLUG */
 241 #define pfn_to_online_page(pfn)                 \
 242 ({                                              \
 243         struct page *___page = NULL;            \
 244         if (pfn_valid(pfn))                     \
 245                 ___page = pfn_to_page(pfn);     \
 246         ___page;                                \
 247  })
 248
 249 /*
 250  * Stub functions for when hotplug is off
 251  */
 252 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
 253 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
 254 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 255
 256 static inline unsigned zone_span_seqbegin(struct zone *zone)
 257 {
 258         return 0;
 259 }
 260 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 261 {
 262         return 0;
 263 }
 264 static inline void zone_span_writelock(struct zone *zone) {}
 265 static inline void zone_span_writeunlock(struct zone *zone) {}
 266 static inline void zone_seqlock_init(struct zone *zone) {}
 267
 268 static inline int mhp_notimplemented(const char *func)
 269 {
 270         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
 271         dump_stack();
 272         return -ENOSYS;
 273 }
 274
 275 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
 276 {
 277 }
 278
 279 static inline int try_online_node(int nid)
 280 {
 281         return 0;
 282 }
 283
 284 static inline void get_online_mems(void) {}
 285 static inline void put_online_mems(void) {}
 286
 287 static inline void mem_hotplug_begin(void) {}
 288 static inline void mem_hotplug_done(void) {}
 289
 290 static inline bool movable_node_is_enabled(void)
 291 {
 292         return false;
 293 }
 294 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 295
 296 #ifdef CONFIG_MEMORY_HOTREMOVE
 297
 298 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 299 extern void try_offline_node(int nid);
 300 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 301 extern void remove_memory(int nid, u64 start, u64 size);
 302
 303 #else
 304 static inline bool is_mem_section_removable(unsigned long pfn,
 305                                         unsigned long nr_pages)
 306 {
 307         return false;
 308 }
 309
 310 static inline void try_offline_node(int nid) {}
 311
 312 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
 313 {
 314         return -EINVAL;
 315 }
 316
 317 static inline void remove_memory(int nid, u64 start, u64 size) {}
 318 #endif /* CONFIG_MEMORY_HOTREMOVE */
 319
 320 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
 321                 void *arg, int (*func)(struct memory_block *, void *));
 322 extern int add_memory(int nid, u64 start, u64 size);
 323 extern int add_memory_resource(int nid, struct resource *resource, bool online);
 324 extern int arch_add_memory(int nid, u64 start, u64 size,
 325                 struct vmem_altmap *altmap, bool want_memblock);
 326 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
 327                 unsigned long nr_pages, struct vmem_altmap *altmap);
 328 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 329 extern bool is_memblock_offlined(struct memory_block *mem);
 330 extern void remove_memory(int nid, u64 start, u64 size);
 331 extern int sparse_add_one_section(struct pglist_data *pgdat,
 332                 unsigned long start_pfn, struct vmem_altmap *altmap);
 333 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
 334                 unsigned long map_offset, struct vmem_altmap *altmap);
 335 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 336                                           unsigned long pnum);
 337 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
 338                 int online_type);
 339 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
 340                 unsigned long nr_pages);
 341 #endif /* __LINUX_MEMORY_HOTPLUG_H */