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_group; 15 struct resource; 16 struct vmem_altmap; 17 struct dev_pagemap; 18 19 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 20 /* 21 * For supporting node-hotadd, we have to allocate a new pgdat. 22 * 23 * If an arch has generic style NODE_DATA(), 24 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 25 * 26 * In general, generic_alloc_nodedata() is used. 27 * 28 */ 29 extern pg_data_t *arch_alloc_nodedata(int nid); 30 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 31 32 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 33 34 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 35 36 #ifdef CONFIG_NUMA 37 /* 38 * XXX: node aware allocation can't work well to get new node's memory at this time. 39 * Because, pgdat for the new node is not allocated/initialized yet itself. 40 * To use new node's memory, more consideration will be necessary. 41 */ 42 #define generic_alloc_nodedata(nid) \ 43 ({ \ 44 memblock_alloc(sizeof(*pgdat), SMP_CACHE_BYTES); \ 45 }) 46 47 extern pg_data_t *node_data[]; 48 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 49 { 50 node_data[nid] = pgdat; 51 } 52 53 #else /* !CONFIG_NUMA */ 54 55 /* never called */ 56 static inline pg_data_t *generic_alloc_nodedata(int nid) 57 { 58 BUG(); 59 return NULL; 60 } 61 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 62 { 63 } 64 #endif /* CONFIG_NUMA */ 65 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 66 67 #ifdef CONFIG_MEMORY_HOTPLUG 68 struct page *pfn_to_online_page(unsigned long pfn); 69 70 /* Types for control the zone type of onlined and offlined memory */ 71 enum { 72 /* Offline the memory. */ 73 MMOP_OFFLINE = 0, 74 /* Online the memory. Zone depends, see default_zone_for_pfn(). */ 75 MMOP_ONLINE, 76 /* Online the memory to ZONE_NORMAL. */ 77 MMOP_ONLINE_KERNEL, 78 /* Online the memory to ZONE_MOVABLE. */ 79 MMOP_ONLINE_MOVABLE, 80 }; 81 82 /* Flags for add_memory() and friends to specify memory hotplug details. */ 83 typedef int __bitwise mhp_t; 84 85 /* No special request */ 86 #define MHP_NONE ((__force mhp_t)0) 87 /* 88 * Allow merging of the added System RAM resource with adjacent, 89 * mergeable resources. After a successful call to add_memory_resource() 90 * with this flag set, the resource pointer must no longer be used as it 91 * might be stale, or the resource might have changed. 92 */ 93 #define MHP_MERGE_RESOURCE ((__force mhp_t)BIT(0)) 94 95 /* 96 * We want memmap (struct page array) to be self contained. 97 * To do so, we will use the beginning of the hot-added range to build 98 * the page tables for the memmap array that describes the entire range. 99 * Only selected architectures support it with SPARSE_VMEMMAP. 100 * This is only a hint, the core kernel can decide to not do this based on 101 * different alignment checks. 102 */ 103 #define MHP_MEMMAP_ON_MEMORY ((__force mhp_t)BIT(1)) 104 /* 105 * The nid field specifies a memory group id (mgid) instead. The memory group 106 * implies the node id (nid). 107 */ 108 #define MHP_NID_IS_MGID ((__force mhp_t)BIT(2)) 109 110 /* 111 * Extended parameters for memory hotplug: 112 * altmap: alternative allocator for memmap array (optional) 113 * pgprot: page protection flags to apply to newly created page tables 114 * (required) 115 */ 116 struct mhp_params { 117 struct vmem_altmap *altmap; 118 pgprot_t pgprot; 119 struct dev_pagemap *pgmap; 120 }; 121 122 bool mhp_range_allowed(u64 start, u64 size, bool need_mapping); 123 struct range mhp_get_pluggable_range(bool need_mapping); 124 125 /* 126 * Zone resizing functions 127 * 128 * Note: any attempt to resize a zone should has pgdat_resize_lock() 129 * zone_span_writelock() both held. This ensure the size of a zone 130 * can't be changed while pgdat_resize_lock() held. 131 */ 132 static inline unsigned zone_span_seqbegin(struct zone *zone) 133 { 134 return read_seqbegin(&zone->span_seqlock); 135 } 136 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 137 { 138 return read_seqretry(&zone->span_seqlock, iv); 139 } 140 static inline void zone_span_writelock(struct zone *zone) 141 { 142 write_seqlock(&zone->span_seqlock); 143 } 144 static inline void zone_span_writeunlock(struct zone *zone) 145 { 146 write_sequnlock(&zone->span_seqlock); 147 } 148 static inline void zone_seqlock_init(struct zone *zone) 149 { 150 seqlock_init(&zone->span_seqlock); 151 } 152 extern void adjust_present_page_count(struct page *page, 153 struct memory_group *group, 154 long nr_pages); 155 /* VM interface that may be used by firmware interface */ 156 extern int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages, 157 struct zone *zone); 158 extern void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages); 159 extern int online_pages(unsigned long pfn, unsigned long nr_pages, 160 struct zone *zone, struct memory_group *group); 161 extern void __offline_isolated_pages(unsigned long start_pfn, 162 unsigned long end_pfn); 163 164 typedef void (*online_page_callback_t)(struct page *page, unsigned int order); 165 166 extern void generic_online_page(struct page *page, unsigned int order); 167 extern int set_online_page_callback(online_page_callback_t callback); 168 extern int restore_online_page_callback(online_page_callback_t callback); 169 170 extern int try_online_node(int nid); 171 172 extern int arch_add_memory(int nid, u64 start, u64 size, 173 struct mhp_params *params); 174 extern u64 max_mem_size; 175 176 extern int mhp_online_type_from_str(const char *str); 177 178 /* Default online_type (MMOP_*) when new memory blocks are added. */ 179 extern int mhp_default_online_type; 180 /* If movable_node boot option specified */ 181 extern bool movable_node_enabled; 182 static inline bool movable_node_is_enabled(void) 183 { 184 return movable_node_enabled; 185 } 186 187 extern void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap); 188 extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages, 189 struct vmem_altmap *altmap); 190 191 /* reasonably generic interface to expand the physical pages */ 192 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 193 struct mhp_params *params); 194 195 #ifndef CONFIG_ARCH_HAS_ADD_PAGES 196 static inline int add_pages(int nid, unsigned long start_pfn, 197 unsigned long nr_pages, struct mhp_params *params) 198 { 199 return __add_pages(nid, start_pfn, nr_pages, params); 200 } 201 #else /* ARCH_HAS_ADD_PAGES */ 202 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 203 struct mhp_params *params); 204 #endif /* ARCH_HAS_ADD_PAGES */ 205 206 void get_online_mems(void); 207 void put_online_mems(void); 208 209 void mem_hotplug_begin(void); 210 void mem_hotplug_done(void); 211 212 /* See kswapd_is_running() */ 213 static inline void pgdat_kswapd_lock(pg_data_t *pgdat) 214 { 215 mutex_lock(&pgdat->kswapd_lock); 216 } 217 218 static inline void pgdat_kswapd_unlock(pg_data_t *pgdat) 219 { 220 mutex_unlock(&pgdat->kswapd_lock); 221 } 222 223 static inline void pgdat_kswapd_lock_init(pg_data_t *pgdat) 224 { 225 mutex_init(&pgdat->kswapd_lock); 226 } 227 228 #else /* ! CONFIG_MEMORY_HOTPLUG */ 229 #define pfn_to_online_page(pfn) \ 230 ({ \ 231 struct page *___page = NULL; \ 232 if (pfn_valid(pfn)) \ 233 ___page = pfn_to_page(pfn); \ 234 ___page; \ 235 }) 236 237 static inline unsigned zone_span_seqbegin(struct zone *zone) 238 { 239 return 0; 240 } 241 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 242 { 243 return 0; 244 } 245 static inline void zone_span_writelock(struct zone *zone) {} 246 static inline void zone_span_writeunlock(struct zone *zone) {} 247 static inline void zone_seqlock_init(struct zone *zone) {} 248 249 static inline int try_online_node(int nid) 250 { 251 return 0; 252 } 253 254 static inline void get_online_mems(void) {} 255 static inline void put_online_mems(void) {} 256 257 static inline void mem_hotplug_begin(void) {} 258 static inline void mem_hotplug_done(void) {} 259 260 static inline bool movable_node_is_enabled(void) 261 { 262 return false; 263 } 264 265 static inline void pgdat_kswapd_lock(pg_data_t *pgdat) {} 266 static inline void pgdat_kswapd_unlock(pg_data_t *pgdat) {} 267 static inline void pgdat_kswapd_lock_init(pg_data_t *pgdat) {} 268 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 269 270 /* 271 * Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some 272 * platforms might override and use arch_get_mappable_range() 273 * for internal non memory hotplug purposes. 274 */ 275 struct range arch_get_mappable_range(void); 276 277 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) 278 /* 279 * pgdat resizing functions 280 */ 281 static inline 282 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 283 { 284 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 285 } 286 static inline 287 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 288 { 289 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 290 } 291 static inline 292 void pgdat_resize_init(struct pglist_data *pgdat) 293 { 294 spin_lock_init(&pgdat->node_size_lock); 295 } 296 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 297 /* 298 * Stub functions for when hotplug is off 299 */ 300 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 301 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 302 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 303 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 304 305 #ifdef CONFIG_MEMORY_HOTREMOVE 306 307 extern void try_offline_node(int nid); 308 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages, 309 struct zone *zone, struct memory_group *group); 310 extern int remove_memory(u64 start, u64 size); 311 extern void __remove_memory(u64 start, u64 size); 312 extern int offline_and_remove_memory(u64 start, u64 size); 313 314 #else 315 static inline void try_offline_node(int nid) {} 316 317 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages, 318 struct zone *zone, struct memory_group *group) 319 { 320 return -EINVAL; 321 } 322 323 static inline int remove_memory(u64 start, u64 size) 324 { 325 return -EBUSY; 326 } 327 328 static inline void __remove_memory(u64 start, u64 size) {} 329 #endif /* CONFIG_MEMORY_HOTREMOVE */ 330 331 #ifdef CONFIG_MEMORY_HOTPLUG 332 extern void __ref free_area_init_core_hotplug(struct pglist_data *pgdat); 333 extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags); 334 extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags); 335 extern int add_memory_resource(int nid, struct resource *resource, 336 mhp_t mhp_flags); 337 extern int add_memory_driver_managed(int nid, u64 start, u64 size, 338 const char *resource_name, 339 mhp_t mhp_flags); 340 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 341 unsigned long nr_pages, 342 struct vmem_altmap *altmap, int migratetype); 343 extern void remove_pfn_range_from_zone(struct zone *zone, 344 unsigned long start_pfn, 345 unsigned long nr_pages); 346 extern int sparse_add_section(int nid, unsigned long pfn, 347 unsigned long nr_pages, struct vmem_altmap *altmap, 348 struct dev_pagemap *pgmap); 349 extern void sparse_remove_section(unsigned long pfn, unsigned long nr_pages, 350 struct vmem_altmap *altmap); 351 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 352 unsigned long pnum); 353 extern struct zone *zone_for_pfn_range(int online_type, int nid, 354 struct memory_group *group, unsigned long start_pfn, 355 unsigned long nr_pages); 356 extern int arch_create_linear_mapping(int nid, u64 start, u64 size, 357 struct mhp_params *params); 358 void arch_remove_linear_mapping(u64 start, u64 size); 359 #endif /* CONFIG_MEMORY_HOTPLUG */ 360 361 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 362