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 ___pfn = pfn; \ 28 unsigned long ___nr = pfn_to_section_nr(___pfn); \ 29 \ 30 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \ 31 pfn_valid_within(___pfn)) \ 32 ___page = pfn_to_page(___pfn); \ 33 ___page; \ 34 }) 35 36 /* 37 * Types for free bootmem stored in page->lru.next. These have to be in 38 * some random range in unsigned long space for debugging purposes. 39 */ 40 enum { 41 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 42 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 43 MIX_SECTION_INFO, 44 NODE_INFO, 45 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 46 }; 47 48 /* Types for control the zone type of onlined and offlined memory */ 49 enum { 50 MMOP_OFFLINE = -1, 51 MMOP_ONLINE_KEEP, 52 MMOP_ONLINE_KERNEL, 53 MMOP_ONLINE_MOVABLE, 54 }; 55 56 /* 57 * Restrictions for the memory hotplug: 58 * flags: MHP_ flags 59 * altmap: alternative allocator for memmap array 60 */ 61 struct mhp_restrictions { 62 unsigned long flags; 63 struct vmem_altmap *altmap; 64 }; 65 66 /* 67 * Zone resizing functions 68 * 69 * Note: any attempt to resize a zone should has pgdat_resize_lock() 70 * zone_span_writelock() both held. This ensure the size of a zone 71 * can't be changed while pgdat_resize_lock() held. 72 */ 73 static inline unsigned zone_span_seqbegin(struct zone *zone) 74 { 75 return read_seqbegin(&zone->span_seqlock); 76 } 77 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 78 { 79 return read_seqretry(&zone->span_seqlock, iv); 80 } 81 static inline void zone_span_writelock(struct zone *zone) 82 { 83 write_seqlock(&zone->span_seqlock); 84 } 85 static inline void zone_span_writeunlock(struct zone *zone) 86 { 87 write_sequnlock(&zone->span_seqlock); 88 } 89 static inline void zone_seqlock_init(struct zone *zone) 90 { 91 seqlock_init(&zone->span_seqlock); 92 } 93 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 94 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 95 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 96 /* VM interface that may be used by firmware interface */ 97 extern int online_pages(unsigned long, unsigned long, int); 98 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, 99 unsigned long *valid_start, unsigned long *valid_end); 100 extern unsigned long __offline_isolated_pages(unsigned long start_pfn, 101 unsigned long end_pfn); 102 103 typedef void (*online_page_callback_t)(struct page *page, unsigned int order); 104 105 extern int set_online_page_callback(online_page_callback_t callback); 106 extern int restore_online_page_callback(online_page_callback_t callback); 107 108 extern void __online_page_set_limits(struct page *page); 109 extern void __online_page_increment_counters(struct page *page); 110 extern void __online_page_free(struct page *page); 111 112 extern int try_online_node(int nid); 113 114 extern int arch_add_memory(int nid, u64 start, u64 size, 115 struct mhp_restrictions *restrictions); 116 extern u64 max_mem_size; 117 118 extern bool memhp_auto_online; 119 /* If movable_node boot option specified */ 120 extern bool movable_node_enabled; 121 static inline bool movable_node_is_enabled(void) 122 { 123 return movable_node_enabled; 124 } 125 126 #ifdef CONFIG_MEMORY_HOTREMOVE 127 extern void arch_remove_memory(int nid, u64 start, u64 size, 128 struct vmem_altmap *altmap); 129 extern void __remove_pages(struct zone *zone, unsigned long start_pfn, 130 unsigned long nr_pages, struct vmem_altmap *altmap); 131 #endif /* CONFIG_MEMORY_HOTREMOVE */ 132 133 /* 134 * Do we want sysfs memblock files created. This will allow userspace to online 135 * and offline memory explicitly. Lack of this bit means that the caller has to 136 * call move_pfn_range_to_zone to finish the initialization. 137 */ 138 139 #define MHP_MEMBLOCK_API (1<<0) 140 141 /* reasonably generic interface to expand the physical pages */ 142 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 143 struct mhp_restrictions *restrictions); 144 145 #ifndef CONFIG_ARCH_HAS_ADD_PAGES 146 static inline int add_pages(int nid, unsigned long start_pfn, 147 unsigned long nr_pages, struct mhp_restrictions *restrictions) 148 { 149 return __add_pages(nid, start_pfn, nr_pages, restrictions); 150 } 151 #else /* ARCH_HAS_ADD_PAGES */ 152 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 153 struct mhp_restrictions *restrictions); 154 #endif /* ARCH_HAS_ADD_PAGES */ 155 156 #ifdef CONFIG_NUMA 157 extern int memory_add_physaddr_to_nid(u64 start); 158 #else 159 static inline int memory_add_physaddr_to_nid(u64 start) 160 { 161 return 0; 162 } 163 #endif 164 165 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 166 /* 167 * For supporting node-hotadd, we have to allocate a new pgdat. 168 * 169 * If an arch has generic style NODE_DATA(), 170 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 171 * 172 * In general, generic_alloc_nodedata() is used. 173 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 174 * 175 */ 176 extern pg_data_t *arch_alloc_nodedata(int nid); 177 extern void arch_free_nodedata(pg_data_t *pgdat); 178 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 179 180 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 181 182 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 183 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 184 185 #ifdef CONFIG_NUMA 186 /* 187 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 188 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 189 * Because, pgdat for the new node is not allocated/initialized yet itself. 190 * To use new node's memory, more consideration will be necessary. 191 */ 192 #define generic_alloc_nodedata(nid) \ 193 ({ \ 194 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 195 }) 196 /* 197 * This definition is just for error path in node hotadd. 198 * For node hotremove, we have to replace this. 199 */ 200 #define generic_free_nodedata(pgdat) kfree(pgdat) 201 202 extern pg_data_t *node_data[]; 203 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 204 { 205 node_data[nid] = pgdat; 206 } 207 208 #else /* !CONFIG_NUMA */ 209 210 /* never called */ 211 static inline pg_data_t *generic_alloc_nodedata(int nid) 212 { 213 BUG(); 214 return NULL; 215 } 216 static inline void generic_free_nodedata(pg_data_t *pgdat) 217 { 218 } 219 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 220 { 221 } 222 #endif /* CONFIG_NUMA */ 223 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 224 225 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 226 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 227 #else 228 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 229 { 230 } 231 #endif 232 extern void put_page_bootmem(struct page *page); 233 extern void get_page_bootmem(unsigned long ingo, struct page *page, 234 unsigned long type); 235 236 void get_online_mems(void); 237 void put_online_mems(void); 238 239 void mem_hotplug_begin(void); 240 void mem_hotplug_done(void); 241 242 extern void set_zone_contiguous(struct zone *zone); 243 extern void clear_zone_contiguous(struct zone *zone); 244 245 #else /* ! CONFIG_MEMORY_HOTPLUG */ 246 #define pfn_to_online_page(pfn) \ 247 ({ \ 248 struct page *___page = NULL; \ 249 if (pfn_valid(pfn)) \ 250 ___page = pfn_to_page(pfn); \ 251 ___page; \ 252 }) 253 254 static inline unsigned zone_span_seqbegin(struct zone *zone) 255 { 256 return 0; 257 } 258 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 259 { 260 return 0; 261 } 262 static inline void zone_span_writelock(struct zone *zone) {} 263 static inline void zone_span_writeunlock(struct zone *zone) {} 264 static inline void zone_seqlock_init(struct zone *zone) {} 265 266 static inline int mhp_notimplemented(const char *func) 267 { 268 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 269 dump_stack(); 270 return -ENOSYS; 271 } 272 273 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 274 { 275 } 276 277 static inline int try_online_node(int nid) 278 { 279 return 0; 280 } 281 282 static inline void get_online_mems(void) {} 283 static inline void put_online_mems(void) {} 284 285 static inline void mem_hotplug_begin(void) {} 286 static inline void mem_hotplug_done(void) {} 287 288 static inline bool movable_node_is_enabled(void) 289 { 290 return false; 291 } 292 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 293 294 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) 295 /* 296 * pgdat resizing functions 297 */ 298 static inline 299 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 300 { 301 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 302 } 303 static inline 304 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 305 { 306 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 307 } 308 static inline 309 void pgdat_resize_init(struct pglist_data *pgdat) 310 { 311 spin_lock_init(&pgdat->node_size_lock); 312 } 313 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 314 /* 315 * Stub functions for when hotplug is off 316 */ 317 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 318 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 319 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 320 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 321 322 #ifdef CONFIG_MEMORY_HOTREMOVE 323 324 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 325 extern void try_offline_node(int nid); 326 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 327 extern void remove_memory(int nid, u64 start, u64 size); 328 extern void __remove_memory(int nid, u64 start, u64 size); 329 330 #else 331 static inline bool is_mem_section_removable(unsigned long pfn, 332 unsigned long nr_pages) 333 { 334 return false; 335 } 336 337 static inline void try_offline_node(int nid) {} 338 339 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 340 { 341 return -EINVAL; 342 } 343 344 static inline void remove_memory(int nid, u64 start, u64 size) {} 345 static inline void __remove_memory(int nid, u64 start, u64 size) {} 346 #endif /* CONFIG_MEMORY_HOTREMOVE */ 347 348 extern void __ref free_area_init_core_hotplug(int nid); 349 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 350 void *arg, int (*func)(struct memory_block *, void *)); 351 extern int __add_memory(int nid, u64 start, u64 size); 352 extern int add_memory(int nid, u64 start, u64 size); 353 extern int add_memory_resource(int nid, struct resource *resource); 354 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 355 unsigned long nr_pages, struct vmem_altmap *altmap); 356 extern bool is_memblock_offlined(struct memory_block *mem); 357 extern int sparse_add_one_section(int nid, unsigned long start_pfn, 358 struct vmem_altmap *altmap); 359 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms, 360 unsigned long map_offset, struct vmem_altmap *altmap); 361 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 362 unsigned long pnum); 363 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, 364 int online_type); 365 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, 366 unsigned long nr_pages); 367 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 368