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 * Zone resizing functions 58 * 59 * Note: any attempt to resize a zone should has pgdat_resize_lock() 60 * zone_span_writelock() both held. This ensure the size of a zone 61 * can't be changed while pgdat_resize_lock() held. 62 */ 63 static inline unsigned zone_span_seqbegin(struct zone *zone) 64 { 65 return read_seqbegin(&zone->span_seqlock); 66 } 67 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 68 { 69 return read_seqretry(&zone->span_seqlock, iv); 70 } 71 static inline void zone_span_writelock(struct zone *zone) 72 { 73 write_seqlock(&zone->span_seqlock); 74 } 75 static inline void zone_span_writeunlock(struct zone *zone) 76 { 77 write_sequnlock(&zone->span_seqlock); 78 } 79 static inline void zone_seqlock_init(struct zone *zone) 80 { 81 seqlock_init(&zone->span_seqlock); 82 } 83 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 84 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 85 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 86 /* VM interface that may be used by firmware interface */ 87 extern int online_pages(unsigned long, unsigned long, int); 88 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, 89 unsigned long *valid_start, unsigned long *valid_end); 90 extern void __offline_isolated_pages(unsigned long, unsigned long); 91 92 typedef void (*online_page_callback_t)(struct page *page, unsigned int order); 93 94 extern int set_online_page_callback(online_page_callback_t callback); 95 extern int restore_online_page_callback(online_page_callback_t callback); 96 97 extern void __online_page_set_limits(struct page *page); 98 extern void __online_page_increment_counters(struct page *page); 99 extern void __online_page_free(struct page *page); 100 101 extern int try_online_node(int nid); 102 103 extern u64 max_mem_size; 104 105 extern bool memhp_auto_online; 106 /* If movable_node boot option specified */ 107 extern bool movable_node_enabled; 108 static inline bool movable_node_is_enabled(void) 109 { 110 return movable_node_enabled; 111 } 112 113 #ifdef CONFIG_MEMORY_HOTREMOVE 114 extern int arch_remove_memory(int nid, u64 start, u64 size, 115 struct vmem_altmap *altmap); 116 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 117 unsigned long nr_pages, struct vmem_altmap *altmap); 118 #endif /* CONFIG_MEMORY_HOTREMOVE */ 119 120 /* reasonably generic interface to expand the physical pages */ 121 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 122 struct vmem_altmap *altmap, bool want_memblock); 123 124 #ifndef CONFIG_ARCH_HAS_ADD_PAGES 125 static inline int add_pages(int nid, unsigned long start_pfn, 126 unsigned long nr_pages, struct vmem_altmap *altmap, 127 bool want_memblock) 128 { 129 return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock); 130 } 131 #else /* ARCH_HAS_ADD_PAGES */ 132 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 133 struct vmem_altmap *altmap, bool want_memblock); 134 #endif /* ARCH_HAS_ADD_PAGES */ 135 136 #ifdef CONFIG_NUMA 137 extern int memory_add_physaddr_to_nid(u64 start); 138 #else 139 static inline int memory_add_physaddr_to_nid(u64 start) 140 { 141 return 0; 142 } 143 #endif 144 145 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 146 /* 147 * For supporting node-hotadd, we have to allocate a new pgdat. 148 * 149 * If an arch has generic style NODE_DATA(), 150 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 151 * 152 * In general, generic_alloc_nodedata() is used. 153 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 154 * 155 */ 156 extern pg_data_t *arch_alloc_nodedata(int nid); 157 extern void arch_free_nodedata(pg_data_t *pgdat); 158 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 159 160 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 161 162 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 163 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 164 165 #ifdef CONFIG_NUMA 166 /* 167 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 168 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 169 * Because, pgdat for the new node is not allocated/initialized yet itself. 170 * To use new node's memory, more consideration will be necessary. 171 */ 172 #define generic_alloc_nodedata(nid) \ 173 ({ \ 174 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 175 }) 176 /* 177 * This definition is just for error path in node hotadd. 178 * For node hotremove, we have to replace this. 179 */ 180 #define generic_free_nodedata(pgdat) kfree(pgdat) 181 182 extern pg_data_t *node_data[]; 183 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 184 { 185 node_data[nid] = pgdat; 186 } 187 188 #else /* !CONFIG_NUMA */ 189 190 /* never called */ 191 static inline pg_data_t *generic_alloc_nodedata(int nid) 192 { 193 BUG(); 194 return NULL; 195 } 196 static inline void generic_free_nodedata(pg_data_t *pgdat) 197 { 198 } 199 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 200 { 201 } 202 #endif /* CONFIG_NUMA */ 203 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 204 205 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 206 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 207 #else 208 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 209 { 210 } 211 #endif 212 extern void put_page_bootmem(struct page *page); 213 extern void get_page_bootmem(unsigned long ingo, struct page *page, 214 unsigned long type); 215 216 void get_online_mems(void); 217 void put_online_mems(void); 218 219 void mem_hotplug_begin(void); 220 void mem_hotplug_done(void); 221 222 extern void set_zone_contiguous(struct zone *zone); 223 extern void clear_zone_contiguous(struct zone *zone); 224 225 #else /* ! CONFIG_MEMORY_HOTPLUG */ 226 #define pfn_to_online_page(pfn) \ 227 ({ \ 228 struct page *___page = NULL; \ 229 if (pfn_valid(pfn)) \ 230 ___page = pfn_to_page(pfn); \ 231 ___page; \ 232 }) 233 234 static inline unsigned zone_span_seqbegin(struct zone *zone) 235 { 236 return 0; 237 } 238 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 239 { 240 return 0; 241 } 242 static inline void zone_span_writelock(struct zone *zone) {} 243 static inline void zone_span_writeunlock(struct zone *zone) {} 244 static inline void zone_seqlock_init(struct zone *zone) {} 245 246 static inline int mhp_notimplemented(const char *func) 247 { 248 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 249 dump_stack(); 250 return -ENOSYS; 251 } 252 253 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 254 { 255 } 256 257 static inline int try_online_node(int nid) 258 { 259 return 0; 260 } 261 262 static inline void get_online_mems(void) {} 263 static inline void put_online_mems(void) {} 264 265 static inline void mem_hotplug_begin(void) {} 266 static inline void mem_hotplug_done(void) {} 267 268 static inline bool movable_node_is_enabled(void) 269 { 270 return false; 271 } 272 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 273 274 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) 275 /* 276 * pgdat resizing functions 277 */ 278 static inline 279 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 280 { 281 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 282 } 283 static inline 284 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 285 { 286 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 287 } 288 static inline 289 void pgdat_resize_init(struct pglist_data *pgdat) 290 { 291 spin_lock_init(&pgdat->node_size_lock); 292 } 293 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 294 /* 295 * Stub functions for when hotplug is off 296 */ 297 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 298 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 299 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 300 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 301 302 #ifdef CONFIG_MEMORY_HOTREMOVE 303 304 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 305 extern void try_offline_node(int nid); 306 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 307 extern void remove_memory(int nid, u64 start, u64 size); 308 extern void __remove_memory(int nid, u64 start, u64 size); 309 310 #else 311 static inline bool is_mem_section_removable(unsigned long pfn, 312 unsigned long nr_pages) 313 { 314 return false; 315 } 316 317 static inline void try_offline_node(int nid) {} 318 319 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 320 { 321 return -EINVAL; 322 } 323 324 static inline void remove_memory(int nid, u64 start, u64 size) {} 325 static inline void __remove_memory(int nid, u64 start, u64 size) {} 326 #endif /* CONFIG_MEMORY_HOTREMOVE */ 327 328 extern void __ref free_area_init_core_hotplug(int nid); 329 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 330 void *arg, int (*func)(struct memory_block *, void *)); 331 extern int __add_memory(int nid, u64 start, u64 size); 332 extern int add_memory(int nid, u64 start, u64 size); 333 extern int add_memory_resource(int nid, struct resource *resource); 334 extern int arch_add_memory(int nid, u64 start, u64 size, 335 struct vmem_altmap *altmap, bool want_memblock); 336 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 337 unsigned long nr_pages, struct vmem_altmap *altmap); 338 extern bool is_memblock_offlined(struct memory_block *mem); 339 extern int sparse_add_one_section(int nid, unsigned long start_pfn, 340 struct vmem_altmap *altmap); 341 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms, 342 unsigned long map_offset, struct vmem_altmap *altmap); 343 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 344 unsigned long pnum); 345 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, 346 int online_type); 347 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, 348 unsigned long nr_pages); 349 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 350