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 struct page *pfn_to_online_page(unsigned long pfn); 20 21 /* 22 * Types for free bootmem stored in page->lru.next. These have to be in 23 * some random range in unsigned long space for debugging purposes. 24 */ 25 enum { 26 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 27 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 28 MIX_SECTION_INFO, 29 NODE_INFO, 30 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 31 }; 32 33 /* Types for control the zone type of onlined and offlined memory */ 34 enum { 35 /* Offline the memory. */ 36 MMOP_OFFLINE = 0, 37 /* Online the memory. Zone depends, see default_zone_for_pfn(). */ 38 MMOP_ONLINE, 39 /* Online the memory to ZONE_NORMAL. */ 40 MMOP_ONLINE_KERNEL, 41 /* Online the memory to ZONE_MOVABLE. */ 42 MMOP_ONLINE_MOVABLE, 43 }; 44 45 /* Flags for add_memory() and friends to specify memory hotplug details. */ 46 typedef int __bitwise mhp_t; 47 48 /* No special request */ 49 #define MHP_NONE ((__force mhp_t)0) 50 /* 51 * Allow merging of the added System RAM resource with adjacent, 52 * mergeable resources. After a successful call to add_memory_resource() 53 * with this flag set, the resource pointer must no longer be used as it 54 * might be stale, or the resource might have changed. 55 */ 56 #define MHP_MERGE_RESOURCE ((__force mhp_t)BIT(0)) 57 58 /* 59 * Extended parameters for memory hotplug: 60 * altmap: alternative allocator for memmap array (optional) 61 * pgprot: page protection flags to apply to newly created page tables 62 * (required) 63 */ 64 struct mhp_params { 65 struct vmem_altmap *altmap; 66 pgprot_t pgprot; 67 }; 68 69 bool mhp_range_allowed(u64 start, u64 size, bool need_mapping); 70 struct range mhp_get_pluggable_range(bool need_mapping); 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 pfn, unsigned long nr_pages, 104 int online_type, int nid); 105 extern struct zone *test_pages_in_a_zone(unsigned long start_pfn, 106 unsigned long end_pfn); 107 extern void __offline_isolated_pages(unsigned long start_pfn, 108 unsigned long end_pfn); 109 110 typedef void (*online_page_callback_t)(struct page *page, unsigned int order); 111 112 extern void generic_online_page(struct page *page, unsigned int order); 113 extern int set_online_page_callback(online_page_callback_t callback); 114 extern int restore_online_page_callback(online_page_callback_t callback); 115 116 extern int try_online_node(int nid); 117 118 extern int arch_add_memory(int nid, u64 start, u64 size, 119 struct mhp_params *params); 120 extern u64 max_mem_size; 121 122 extern int mhp_online_type_from_str(const char *str); 123 124 /* Default online_type (MMOP_*) when new memory blocks are added. */ 125 extern int mhp_default_online_type; 126 /* If movable_node boot option specified */ 127 extern bool movable_node_enabled; 128 static inline bool movable_node_is_enabled(void) 129 { 130 return movable_node_enabled; 131 } 132 133 extern void arch_remove_memory(int nid, u64 start, u64 size, 134 struct vmem_altmap *altmap); 135 extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages, 136 struct vmem_altmap *altmap); 137 138 /* reasonably generic interface to expand the physical pages */ 139 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 140 struct mhp_params *params); 141 142 #ifndef CONFIG_ARCH_HAS_ADD_PAGES 143 static inline int add_pages(int nid, unsigned long start_pfn, 144 unsigned long nr_pages, struct mhp_params *params) 145 { 146 return __add_pages(nid, start_pfn, nr_pages, params); 147 } 148 #else /* ARCH_HAS_ADD_PAGES */ 149 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 150 struct mhp_params *params); 151 #endif /* ARCH_HAS_ADD_PAGES */ 152 153 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 154 /* 155 * For supporting node-hotadd, we have to allocate a new pgdat. 156 * 157 * If an arch has generic style NODE_DATA(), 158 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 159 * 160 * In general, generic_alloc_nodedata() is used. 161 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 162 * 163 */ 164 extern pg_data_t *arch_alloc_nodedata(int nid); 165 extern void arch_free_nodedata(pg_data_t *pgdat); 166 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 167 168 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 169 170 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 171 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 172 173 #ifdef CONFIG_NUMA 174 /* 175 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 176 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 177 * Because, pgdat for the new node is not allocated/initialized yet itself. 178 * To use new node's memory, more consideration will be necessary. 179 */ 180 #define generic_alloc_nodedata(nid) \ 181 ({ \ 182 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 183 }) 184 /* 185 * This definition is just for error path in node hotadd. 186 * For node hotremove, we have to replace this. 187 */ 188 #define generic_free_nodedata(pgdat) kfree(pgdat) 189 190 extern pg_data_t *node_data[]; 191 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 192 { 193 node_data[nid] = pgdat; 194 } 195 196 #else /* !CONFIG_NUMA */ 197 198 /* never called */ 199 static inline pg_data_t *generic_alloc_nodedata(int nid) 200 { 201 BUG(); 202 return NULL; 203 } 204 static inline void generic_free_nodedata(pg_data_t *pgdat) 205 { 206 } 207 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 208 { 209 } 210 #endif /* CONFIG_NUMA */ 211 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 212 213 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 214 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 215 #else 216 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 217 { 218 } 219 #endif 220 extern void put_page_bootmem(struct page *page); 221 extern void get_page_bootmem(unsigned long ingo, struct page *page, 222 unsigned long type); 223 224 void get_online_mems(void); 225 void put_online_mems(void); 226 227 void mem_hotplug_begin(void); 228 void mem_hotplug_done(void); 229 230 #else /* ! CONFIG_MEMORY_HOTPLUG */ 231 #define pfn_to_online_page(pfn) \ 232 ({ \ 233 struct page *___page = NULL; \ 234 if (pfn_valid(pfn)) \ 235 ___page = pfn_to_page(pfn); \ 236 ___page; \ 237 }) 238 239 static inline unsigned zone_span_seqbegin(struct zone *zone) 240 { 241 return 0; 242 } 243 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 244 { 245 return 0; 246 } 247 static inline void zone_span_writelock(struct zone *zone) {} 248 static inline void zone_span_writeunlock(struct zone *zone) {} 249 static inline void zone_seqlock_init(struct zone *zone) {} 250 251 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 252 { 253 } 254 255 static inline int try_online_node(int nid) 256 { 257 return 0; 258 } 259 260 static inline void get_online_mems(void) {} 261 static inline void put_online_mems(void) {} 262 263 static inline void mem_hotplug_begin(void) {} 264 static inline void mem_hotplug_done(void) {} 265 266 static inline bool movable_node_is_enabled(void) 267 { 268 return false; 269 } 270 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 271 272 /* 273 * Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some 274 * platforms might override and use arch_get_mappable_range() 275 * for internal non memory hotplug purposes. 276 */ 277 struct range arch_get_mappable_range(void); 278 279 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) 280 /* 281 * pgdat resizing functions 282 */ 283 static inline 284 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 285 { 286 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 287 } 288 static inline 289 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 290 { 291 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 292 } 293 static inline 294 void pgdat_resize_init(struct pglist_data *pgdat) 295 { 296 spin_lock_init(&pgdat->node_size_lock); 297 } 298 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 299 /* 300 * Stub functions for when hotplug is off 301 */ 302 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 303 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 304 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 305 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 306 307 #ifdef CONFIG_MEMORY_HOTREMOVE 308 309 extern void try_offline_node(int nid); 310 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 311 extern int remove_memory(int nid, u64 start, u64 size); 312 extern void __remove_memory(int nid, u64 start, u64 size); 313 extern int offline_and_remove_memory(int nid, u64 start, u64 size); 314 315 #else 316 static inline void try_offline_node(int nid) {} 317 318 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 319 { 320 return -EINVAL; 321 } 322 323 static inline int remove_memory(int nid, u64 start, u64 size) 324 { 325 return -EBUSY; 326 } 327 328 static inline void __remove_memory(int nid, u64 start, u64 size) {} 329 #endif /* CONFIG_MEMORY_HOTREMOVE */ 330 331 extern void set_zone_contiguous(struct zone *zone); 332 extern void clear_zone_contiguous(struct zone *zone); 333 334 #ifdef CONFIG_MEMORY_HOTPLUG 335 extern void __ref free_area_init_core_hotplug(int nid); 336 extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags); 337 extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags); 338 extern int add_memory_resource(int nid, struct resource *resource, 339 mhp_t mhp_flags); 340 extern int add_memory_driver_managed(int nid, u64 start, u64 size, 341 const char *resource_name, 342 mhp_t mhp_flags); 343 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 344 unsigned long nr_pages, 345 struct vmem_altmap *altmap, int migratetype); 346 extern void remove_pfn_range_from_zone(struct zone *zone, 347 unsigned long start_pfn, 348 unsigned long nr_pages); 349 extern bool is_memblock_offlined(struct memory_block *mem); 350 extern int sparse_add_section(int nid, unsigned long pfn, 351 unsigned long nr_pages, struct vmem_altmap *altmap); 352 extern void sparse_remove_section(struct mem_section *ms, 353 unsigned long pfn, unsigned long nr_pages, 354 unsigned long map_offset, struct vmem_altmap *altmap); 355 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 356 unsigned long pnum); 357 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, 358 unsigned long nr_pages); 359 extern int arch_create_linear_mapping(int nid, u64 start, u64 size, 360 struct mhp_params *params); 361 void arch_remove_linear_mapping(u64 start, u64 size); 362 #endif /* CONFIG_MEMORY_HOTPLUG */ 363 364 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 365