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 */ 101 #define MHP_MEMMAP_ON_MEMORY ((__force mhp_t)BIT(1)) 102 /* 103 * The nid field specifies a memory group id (mgid) instead. The memory group 104 * implies the node id (nid). 105 */ 106 #define MHP_NID_IS_MGID ((__force mhp_t)BIT(2)) 107 108 /* 109 * Extended parameters for memory hotplug: 110 * altmap: alternative allocator for memmap array (optional) 111 * pgprot: page protection flags to apply to newly created page tables 112 * (required) 113 */ 114 struct mhp_params { 115 struct vmem_altmap *altmap; 116 pgprot_t pgprot; 117 struct dev_pagemap *pgmap; 118 }; 119 120 bool mhp_range_allowed(u64 start, u64 size, bool need_mapping); 121 struct range mhp_get_pluggable_range(bool need_mapping); 122 123 /* 124 * Zone resizing functions 125 * 126 * Note: any attempt to resize a zone should has pgdat_resize_lock() 127 * zone_span_writelock() both held. This ensure the size of a zone 128 * can't be changed while pgdat_resize_lock() held. 129 */ 130 static inline unsigned zone_span_seqbegin(struct zone *zone) 131 { 132 return read_seqbegin(&zone->span_seqlock); 133 } 134 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 135 { 136 return read_seqretry(&zone->span_seqlock, iv); 137 } 138 static inline void zone_span_writelock(struct zone *zone) 139 { 140 write_seqlock(&zone->span_seqlock); 141 } 142 static inline void zone_span_writeunlock(struct zone *zone) 143 { 144 write_sequnlock(&zone->span_seqlock); 145 } 146 static inline void zone_seqlock_init(struct zone *zone) 147 { 148 seqlock_init(&zone->span_seqlock); 149 } 150 extern void adjust_present_page_count(struct page *page, 151 struct memory_group *group, 152 long nr_pages); 153 /* VM interface that may be used by firmware interface */ 154 extern int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages, 155 struct zone *zone); 156 extern void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages); 157 extern int online_pages(unsigned long pfn, unsigned long nr_pages, 158 struct zone *zone, struct memory_group *group); 159 extern void __offline_isolated_pages(unsigned long start_pfn, 160 unsigned long end_pfn); 161 162 typedef void (*online_page_callback_t)(struct page *page, unsigned int order); 163 164 extern void generic_online_page(struct page *page, unsigned int order); 165 extern int set_online_page_callback(online_page_callback_t callback); 166 extern int restore_online_page_callback(online_page_callback_t callback); 167 168 extern int try_online_node(int nid); 169 170 extern int arch_add_memory(int nid, u64 start, u64 size, 171 struct mhp_params *params); 172 extern u64 max_mem_size; 173 174 extern int mhp_online_type_from_str(const char *str); 175 176 /* Default online_type (MMOP_*) when new memory blocks are added. */ 177 extern int mhp_default_online_type; 178 /* If movable_node boot option specified */ 179 extern bool movable_node_enabled; 180 static inline bool movable_node_is_enabled(void) 181 { 182 return movable_node_enabled; 183 } 184 185 extern void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap); 186 extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages, 187 struct vmem_altmap *altmap); 188 189 /* reasonably generic interface to expand the physical pages */ 190 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 191 struct mhp_params *params); 192 193 #ifndef CONFIG_ARCH_HAS_ADD_PAGES 194 static inline int add_pages(int nid, unsigned long start_pfn, 195 unsigned long nr_pages, struct mhp_params *params) 196 { 197 return __add_pages(nid, start_pfn, nr_pages, params); 198 } 199 #else /* ARCH_HAS_ADD_PAGES */ 200 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 201 struct mhp_params *params); 202 #endif /* ARCH_HAS_ADD_PAGES */ 203 204 void get_online_mems(void); 205 void put_online_mems(void); 206 207 void mem_hotplug_begin(void); 208 void mem_hotplug_done(void); 209 210 /* See kswapd_is_running() */ 211 static inline void pgdat_kswapd_lock(pg_data_t *pgdat) 212 { 213 mutex_lock(&pgdat->kswapd_lock); 214 } 215 216 static inline void pgdat_kswapd_unlock(pg_data_t *pgdat) 217 { 218 mutex_unlock(&pgdat->kswapd_lock); 219 } 220 221 static inline void pgdat_kswapd_lock_init(pg_data_t *pgdat) 222 { 223 mutex_init(&pgdat->kswapd_lock); 224 } 225 226 #else /* ! CONFIG_MEMORY_HOTPLUG */ 227 #define pfn_to_online_page(pfn) \ 228 ({ \ 229 struct page *___page = NULL; \ 230 if (pfn_valid(pfn)) \ 231 ___page = pfn_to_page(pfn); \ 232 ___page; \ 233 }) 234 235 static inline unsigned zone_span_seqbegin(struct zone *zone) 236 { 237 return 0; 238 } 239 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 240 { 241 return 0; 242 } 243 static inline void zone_span_writelock(struct zone *zone) {} 244 static inline void zone_span_writeunlock(struct zone *zone) {} 245 static inline void zone_seqlock_init(struct zone *zone) {} 246 247 static inline int try_online_node(int nid) 248 { 249 return 0; 250 } 251 252 static inline void get_online_mems(void) {} 253 static inline void put_online_mems(void) {} 254 255 static inline void mem_hotplug_begin(void) {} 256 static inline void mem_hotplug_done(void) {} 257 258 static inline bool movable_node_is_enabled(void) 259 { 260 return false; 261 } 262 263 static inline void pgdat_kswapd_lock(pg_data_t *pgdat) {} 264 static inline void pgdat_kswapd_unlock(pg_data_t *pgdat) {} 265 static inline void pgdat_kswapd_lock_init(pg_data_t *pgdat) {} 266 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 267 268 /* 269 * Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some 270 * platforms might override and use arch_get_mappable_range() 271 * for internal non memory hotplug purposes. 272 */ 273 struct range arch_get_mappable_range(void); 274 275 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) 276 /* 277 * pgdat resizing functions 278 */ 279 static inline 280 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 281 { 282 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 283 } 284 static inline 285 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 286 { 287 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 288 } 289 static inline 290 void pgdat_resize_init(struct pglist_data *pgdat) 291 { 292 spin_lock_init(&pgdat->node_size_lock); 293 } 294 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 295 /* 296 * Stub functions for when hotplug is off 297 */ 298 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 299 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 300 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 301 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 302 303 #ifdef CONFIG_MEMORY_HOTREMOVE 304 305 extern void try_offline_node(int nid); 306 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages, 307 struct zone *zone, struct memory_group *group); 308 extern int remove_memory(u64 start, u64 size); 309 extern void __remove_memory(u64 start, u64 size); 310 extern int offline_and_remove_memory(u64 start, u64 size); 311 312 #else 313 static inline void try_offline_node(int nid) {} 314 315 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages, 316 struct zone *zone, struct memory_group *group) 317 { 318 return -EINVAL; 319 } 320 321 static inline int remove_memory(u64 start, u64 size) 322 { 323 return -EBUSY; 324 } 325 326 static inline void __remove_memory(u64 start, u64 size) {} 327 #endif /* CONFIG_MEMORY_HOTREMOVE */ 328 329 extern void set_zone_contiguous(struct zone *zone); 330 extern void clear_zone_contiguous(struct zone *zone); 331 332 #ifdef CONFIG_MEMORY_HOTPLUG 333 extern void __ref free_area_init_core_hotplug(struct pglist_data *pgdat); 334 extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags); 335 extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags); 336 extern int add_memory_resource(int nid, struct resource *resource, 337 mhp_t mhp_flags); 338 extern int add_memory_driver_managed(int nid, u64 start, u64 size, 339 const char *resource_name, 340 mhp_t mhp_flags); 341 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 342 unsigned long nr_pages, 343 struct vmem_altmap *altmap, int migratetype); 344 extern void remove_pfn_range_from_zone(struct zone *zone, 345 unsigned long start_pfn, 346 unsigned long nr_pages); 347 extern int sparse_add_section(int nid, unsigned long pfn, 348 unsigned long nr_pages, struct vmem_altmap *altmap, 349 struct dev_pagemap *pgmap); 350 extern void sparse_remove_section(struct mem_section *ms, 351 unsigned long pfn, unsigned long nr_pages, 352 unsigned long map_offset, struct vmem_altmap *altmap); 353 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 354 unsigned long pnum); 355 extern struct zone *zone_for_pfn_range(int online_type, int nid, 356 struct memory_group *group, unsigned long start_pfn, 357 unsigned long nr_pages); 358 extern int arch_create_linear_mapping(int nid, u64 start, u64 size, 359 struct mhp_params *params); 360 void arch_remove_linear_mapping(u64 start, u64 size); 361 extern bool mhp_supports_memmap_on_memory(unsigned long size); 362 #endif /* CONFIG_MEMORY_HOTPLUG */ 363 364 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 365