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 void generic_online_page(struct page *page, unsigned int order); 106 extern int set_online_page_callback(online_page_callback_t callback); 107 extern int restore_online_page_callback(online_page_callback_t callback); 108 109 extern int try_online_node(int nid); 110 111 extern int arch_add_memory(int nid, u64 start, u64 size, 112 struct mhp_restrictions *restrictions); 113 extern u64 max_mem_size; 114 115 extern bool memhp_auto_online; 116 /* If movable_node boot option specified */ 117 extern bool movable_node_enabled; 118 static inline bool movable_node_is_enabled(void) 119 { 120 return movable_node_enabled; 121 } 122 123 extern void arch_remove_memory(int nid, u64 start, u64 size, 124 struct vmem_altmap *altmap); 125 extern void __remove_pages(struct zone *zone, unsigned long start_pfn, 126 unsigned long nr_pages, struct vmem_altmap *altmap); 127 128 /* reasonably generic interface to expand the physical pages */ 129 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 130 struct mhp_restrictions *restrictions); 131 132 #ifndef CONFIG_ARCH_HAS_ADD_PAGES 133 static inline int add_pages(int nid, unsigned long start_pfn, 134 unsigned long nr_pages, struct mhp_restrictions *restrictions) 135 { 136 return __add_pages(nid, start_pfn, nr_pages, restrictions); 137 } 138 #else /* ARCH_HAS_ADD_PAGES */ 139 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 140 struct mhp_restrictions *restrictions); 141 #endif /* ARCH_HAS_ADD_PAGES */ 142 143 #ifdef CONFIG_NUMA 144 extern int memory_add_physaddr_to_nid(u64 start); 145 #else 146 static inline int memory_add_physaddr_to_nid(u64 start) 147 { 148 return 0; 149 } 150 #endif 151 152 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 153 /* 154 * For supporting node-hotadd, we have to allocate a new pgdat. 155 * 156 * If an arch has generic style NODE_DATA(), 157 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 158 * 159 * In general, generic_alloc_nodedata() is used. 160 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 161 * 162 */ 163 extern pg_data_t *arch_alloc_nodedata(int nid); 164 extern void arch_free_nodedata(pg_data_t *pgdat); 165 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 166 167 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 168 169 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 170 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 171 172 #ifdef CONFIG_NUMA 173 /* 174 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 175 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 176 * Because, pgdat for the new node is not allocated/initialized yet itself. 177 * To use new node's memory, more consideration will be necessary. 178 */ 179 #define generic_alloc_nodedata(nid) \ 180 ({ \ 181 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 182 }) 183 /* 184 * This definition is just for error path in node hotadd. 185 * For node hotremove, we have to replace this. 186 */ 187 #define generic_free_nodedata(pgdat) kfree(pgdat) 188 189 extern pg_data_t *node_data[]; 190 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 191 { 192 node_data[nid] = pgdat; 193 } 194 195 #else /* !CONFIG_NUMA */ 196 197 /* never called */ 198 static inline pg_data_t *generic_alloc_nodedata(int nid) 199 { 200 BUG(); 201 return NULL; 202 } 203 static inline void generic_free_nodedata(pg_data_t *pgdat) 204 { 205 } 206 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 207 { 208 } 209 #endif /* CONFIG_NUMA */ 210 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 211 212 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 213 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 214 #else 215 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 216 { 217 } 218 #endif 219 extern void put_page_bootmem(struct page *page); 220 extern void get_page_bootmem(unsigned long ingo, struct page *page, 221 unsigned long type); 222 223 void get_online_mems(void); 224 void put_online_mems(void); 225 226 void mem_hotplug_begin(void); 227 void mem_hotplug_done(void); 228 229 #else /* ! CONFIG_MEMORY_HOTPLUG */ 230 #define pfn_to_online_page(pfn) \ 231 ({ \ 232 struct page *___page = NULL; \ 233 if (pfn_valid(pfn)) \ 234 ___page = pfn_to_page(pfn); \ 235 ___page; \ 236 }) 237 238 static inline unsigned zone_span_seqbegin(struct zone *zone) 239 { 240 return 0; 241 } 242 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 243 { 244 return 0; 245 } 246 static inline void zone_span_writelock(struct zone *zone) {} 247 static inline void zone_span_writeunlock(struct zone *zone) {} 248 static inline void zone_seqlock_init(struct zone *zone) {} 249 250 static inline int mhp_notimplemented(const char *func) 251 { 252 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 253 dump_stack(); 254 return -ENOSYS; 255 } 256 257 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 258 { 259 } 260 261 static inline int try_online_node(int nid) 262 { 263 return 0; 264 } 265 266 static inline void get_online_mems(void) {} 267 static inline void put_online_mems(void) {} 268 269 static inline void mem_hotplug_begin(void) {} 270 static inline void mem_hotplug_done(void) {} 271 272 static inline bool movable_node_is_enabled(void) 273 { 274 return false; 275 } 276 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 277 278 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) 279 /* 280 * pgdat resizing functions 281 */ 282 static inline 283 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 284 { 285 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 286 } 287 static inline 288 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 289 { 290 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 291 } 292 static inline 293 void pgdat_resize_init(struct pglist_data *pgdat) 294 { 295 spin_lock_init(&pgdat->node_size_lock); 296 } 297 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 298 /* 299 * Stub functions for when hotplug is off 300 */ 301 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 302 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 303 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 304 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 305 306 #ifdef CONFIG_MEMORY_HOTREMOVE 307 308 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 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); 313 314 #else 315 static inline bool is_mem_section_removable(unsigned long pfn, 316 unsigned long nr_pages) 317 { 318 return false; 319 } 320 321 static inline void try_offline_node(int nid) {} 322 323 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 324 { 325 return -EINVAL; 326 } 327 328 static inline int remove_memory(int nid, u64 start, u64 size) 329 { 330 return -EBUSY; 331 } 332 333 static inline void __remove_memory(int nid, u64 start, u64 size) {} 334 #endif /* CONFIG_MEMORY_HOTREMOVE */ 335 336 extern void set_zone_contiguous(struct zone *zone); 337 extern void clear_zone_contiguous(struct zone *zone); 338 339 extern void __ref free_area_init_core_hotplug(int nid); 340 extern int __add_memory(int nid, u64 start, u64 size); 341 extern int add_memory(int nid, u64 start, u64 size); 342 extern int add_memory_resource(int nid, struct resource *resource); 343 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 344 unsigned long nr_pages, struct vmem_altmap *altmap); 345 extern bool is_memblock_offlined(struct memory_block *mem); 346 extern int sparse_add_section(int nid, unsigned long pfn, 347 unsigned long nr_pages, struct vmem_altmap *altmap); 348 extern void sparse_remove_section(struct mem_section *ms, 349 unsigned long pfn, unsigned long nr_pages, 350 unsigned long map_offset, struct vmem_altmap *altmap); 351 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 352 unsigned long pnum); 353 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, 354 int online_type); 355 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, 356 unsigned long nr_pages); 357 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 358