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