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 int set_online_page_callback(online_page_callback_t callback); 106 extern int restore_online_page_callback(online_page_callback_t callback); 107 108 extern void __online_page_set_limits(struct page *page); 109 extern void __online_page_increment_counters(struct page *page); 110 extern void __online_page_free(struct page *page); 111 112 extern int try_online_node(int nid); 113 114 extern int arch_add_memory(int nid, u64 start, u64 size, 115 struct mhp_restrictions *restrictions); 116 extern u64 max_mem_size; 117 118 extern bool memhp_auto_online; 119 /* If movable_node boot option specified */ 120 extern bool movable_node_enabled; 121 static inline bool movable_node_is_enabled(void) 122 { 123 return movable_node_enabled; 124 } 125 126 extern void arch_remove_memory(int nid, u64 start, u64 size, 127 struct vmem_altmap *altmap); 128 extern void __remove_pages(struct zone *zone, unsigned long start_pfn, 129 unsigned long nr_pages, struct vmem_altmap *altmap); 130 131 /* reasonably generic interface to expand the physical pages */ 132 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 133 struct mhp_restrictions *restrictions); 134 135 #ifndef CONFIG_ARCH_HAS_ADD_PAGES 136 static inline int add_pages(int nid, unsigned long start_pfn, 137 unsigned long nr_pages, struct mhp_restrictions *restrictions) 138 { 139 return __add_pages(nid, start_pfn, nr_pages, restrictions); 140 } 141 #else /* ARCH_HAS_ADD_PAGES */ 142 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 143 struct mhp_restrictions *restrictions); 144 #endif /* ARCH_HAS_ADD_PAGES */ 145 146 #ifdef CONFIG_NUMA 147 extern int memory_add_physaddr_to_nid(u64 start); 148 #else 149 static inline int memory_add_physaddr_to_nid(u64 start) 150 { 151 return 0; 152 } 153 #endif 154 155 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 156 /* 157 * For supporting node-hotadd, we have to allocate a new pgdat. 158 * 159 * If an arch has generic style NODE_DATA(), 160 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 161 * 162 * In general, generic_alloc_nodedata() is used. 163 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 164 * 165 */ 166 extern pg_data_t *arch_alloc_nodedata(int nid); 167 extern void arch_free_nodedata(pg_data_t *pgdat); 168 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 169 170 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 171 172 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 173 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 174 175 #ifdef CONFIG_NUMA 176 /* 177 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 178 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 179 * Because, pgdat for the new node is not allocated/initialized yet itself. 180 * To use new node's memory, more consideration will be necessary. 181 */ 182 #define generic_alloc_nodedata(nid) \ 183 ({ \ 184 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 185 }) 186 /* 187 * This definition is just for error path in node hotadd. 188 * For node hotremove, we have to replace this. 189 */ 190 #define generic_free_nodedata(pgdat) kfree(pgdat) 191 192 extern pg_data_t *node_data[]; 193 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 194 { 195 node_data[nid] = pgdat; 196 } 197 198 #else /* !CONFIG_NUMA */ 199 200 /* never called */ 201 static inline pg_data_t *generic_alloc_nodedata(int nid) 202 { 203 BUG(); 204 return NULL; 205 } 206 static inline void generic_free_nodedata(pg_data_t *pgdat) 207 { 208 } 209 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 210 { 211 } 212 #endif /* CONFIG_NUMA */ 213 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 214 215 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 216 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 217 #else 218 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 219 { 220 } 221 #endif 222 extern void put_page_bootmem(struct page *page); 223 extern void get_page_bootmem(unsigned long ingo, struct page *page, 224 unsigned long type); 225 226 void get_online_mems(void); 227 void put_online_mems(void); 228 229 void mem_hotplug_begin(void); 230 void mem_hotplug_done(void); 231 232 extern void set_zone_contiguous(struct zone *zone); 233 extern void clear_zone_contiguous(struct zone *zone); 234 235 #else /* ! CONFIG_MEMORY_HOTPLUG */ 236 #define pfn_to_online_page(pfn) \ 237 ({ \ 238 struct page *___page = NULL; \ 239 if (pfn_valid(pfn)) \ 240 ___page = pfn_to_page(pfn); \ 241 ___page; \ 242 }) 243 244 static inline unsigned zone_span_seqbegin(struct zone *zone) 245 { 246 return 0; 247 } 248 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 249 { 250 return 0; 251 } 252 static inline void zone_span_writelock(struct zone *zone) {} 253 static inline void zone_span_writeunlock(struct zone *zone) {} 254 static inline void zone_seqlock_init(struct zone *zone) {} 255 256 static inline int mhp_notimplemented(const char *func) 257 { 258 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 259 dump_stack(); 260 return -ENOSYS; 261 } 262 263 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 264 { 265 } 266 267 static inline int try_online_node(int nid) 268 { 269 return 0; 270 } 271 272 static inline void get_online_mems(void) {} 273 static inline void put_online_mems(void) {} 274 275 static inline void mem_hotplug_begin(void) {} 276 static inline void mem_hotplug_done(void) {} 277 278 static inline bool movable_node_is_enabled(void) 279 { 280 return false; 281 } 282 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 283 284 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) 285 /* 286 * pgdat resizing functions 287 */ 288 static inline 289 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 290 { 291 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 292 } 293 static inline 294 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 295 { 296 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 297 } 298 static inline 299 void pgdat_resize_init(struct pglist_data *pgdat) 300 { 301 spin_lock_init(&pgdat->node_size_lock); 302 } 303 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 304 /* 305 * Stub functions for when hotplug is off 306 */ 307 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 308 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 309 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 310 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 311 312 #ifdef CONFIG_MEMORY_HOTREMOVE 313 314 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 315 extern void try_offline_node(int nid); 316 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 317 extern int remove_memory(int nid, u64 start, u64 size); 318 extern void __remove_memory(int nid, u64 start, u64 size); 319 320 #else 321 static inline bool is_mem_section_removable(unsigned long pfn, 322 unsigned long nr_pages) 323 { 324 return false; 325 } 326 327 static inline void try_offline_node(int nid) {} 328 329 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 330 { 331 return -EINVAL; 332 } 333 334 static inline int remove_memory(int nid, u64 start, u64 size) 335 { 336 return -EBUSY; 337 } 338 339 static inline void __remove_memory(int nid, u64 start, u64 size) {} 340 #endif /* CONFIG_MEMORY_HOTREMOVE */ 341 342 extern void __ref free_area_init_core_hotplug(int nid); 343 extern int __add_memory(int nid, u64 start, u64 size); 344 extern int add_memory(int nid, u64 start, u64 size); 345 extern int add_memory_resource(int nid, struct resource *resource); 346 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 347 unsigned long nr_pages, struct vmem_altmap *altmap); 348 extern bool is_memblock_offlined(struct memory_block *mem); 349 extern int sparse_add_section(int nid, unsigned long pfn, 350 unsigned long nr_pages, struct vmem_altmap *altmap); 351 extern void sparse_remove_section(struct mem_section *ms, 352 unsigned long pfn, unsigned long nr_pages, 353 unsigned long map_offset, struct vmem_altmap *altmap); 354 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 355 unsigned long pnum); 356 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, 357 int online_type); 358 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, 359 unsigned long nr_pages); 360 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 361