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