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 ___nr = pfn_to_section_nr(pfn); \ 28 \ 29 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\ 30 ___page = pfn_to_page(pfn); \ 31 ___page; \ 32 }) 33 34 /* 35 * Types for free bootmem stored in page->lru.next. These have to be in 36 * some random range in unsigned long space for debugging purposes. 37 */ 38 enum { 39 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 40 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 41 MIX_SECTION_INFO, 42 NODE_INFO, 43 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 44 }; 45 46 /* Types for control the zone type of onlined and offlined memory */ 47 enum { 48 MMOP_OFFLINE = -1, 49 MMOP_ONLINE_KEEP, 50 MMOP_ONLINE_KERNEL, 51 MMOP_ONLINE_MOVABLE, 52 }; 53 54 /* 55 * Zone resizing functions 56 * 57 * Note: any attempt to resize a zone should has pgdat_resize_lock() 58 * zone_span_writelock() both held. This ensure the size of a zone 59 * can't be changed while pgdat_resize_lock() held. 60 */ 61 static inline unsigned zone_span_seqbegin(struct zone *zone) 62 { 63 return read_seqbegin(&zone->span_seqlock); 64 } 65 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 66 { 67 return read_seqretry(&zone->span_seqlock, iv); 68 } 69 static inline void zone_span_writelock(struct zone *zone) 70 { 71 write_seqlock(&zone->span_seqlock); 72 } 73 static inline void zone_span_writeunlock(struct zone *zone) 74 { 75 write_sequnlock(&zone->span_seqlock); 76 } 77 static inline void zone_seqlock_init(struct zone *zone) 78 { 79 seqlock_init(&zone->span_seqlock); 80 } 81 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 82 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 83 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 84 /* VM interface that may be used by firmware interface */ 85 extern int online_pages(unsigned long, unsigned long, int); 86 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, 87 unsigned long *valid_start, unsigned long *valid_end); 88 extern void __offline_isolated_pages(unsigned long, unsigned long); 89 90 typedef void (*online_page_callback_t)(struct page *page); 91 92 extern int set_online_page_callback(online_page_callback_t callback); 93 extern int restore_online_page_callback(online_page_callback_t callback); 94 95 extern void __online_page_set_limits(struct page *page); 96 extern void __online_page_increment_counters(struct page *page); 97 extern void __online_page_free(struct page *page); 98 99 extern int try_online_node(int nid); 100 101 extern bool memhp_auto_online; 102 /* If movable_node boot option specified */ 103 extern bool movable_node_enabled; 104 static inline bool movable_node_is_enabled(void) 105 { 106 return movable_node_enabled; 107 } 108 109 #ifdef CONFIG_MEMORY_HOTREMOVE 110 extern int arch_remove_memory(u64 start, u64 size, 111 struct vmem_altmap *altmap); 112 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 113 unsigned long nr_pages, struct vmem_altmap *altmap); 114 #endif /* CONFIG_MEMORY_HOTREMOVE */ 115 116 /* reasonably generic interface to expand the physical pages */ 117 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 118 struct vmem_altmap *altmap, bool want_memblock); 119 120 #ifndef CONFIG_ARCH_HAS_ADD_PAGES 121 static inline int add_pages(int nid, unsigned long start_pfn, 122 unsigned long nr_pages, struct vmem_altmap *altmap, 123 bool want_memblock) 124 { 125 return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock); 126 } 127 #else /* ARCH_HAS_ADD_PAGES */ 128 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 129 struct vmem_altmap *altmap, bool want_memblock); 130 #endif /* ARCH_HAS_ADD_PAGES */ 131 132 #ifdef CONFIG_NUMA 133 extern int memory_add_physaddr_to_nid(u64 start); 134 #else 135 static inline int memory_add_physaddr_to_nid(u64 start) 136 { 137 return 0; 138 } 139 #endif 140 141 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 142 /* 143 * For supporting node-hotadd, we have to allocate a new pgdat. 144 * 145 * If an arch has generic style NODE_DATA(), 146 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 147 * 148 * In general, generic_alloc_nodedata() is used. 149 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 150 * 151 */ 152 extern pg_data_t *arch_alloc_nodedata(int nid); 153 extern void arch_free_nodedata(pg_data_t *pgdat); 154 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 155 156 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 157 158 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 159 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 160 161 #ifdef CONFIG_NUMA 162 /* 163 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 164 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 165 * Because, pgdat for the new node is not allocated/initialized yet itself. 166 * To use new node's memory, more consideration will be necessary. 167 */ 168 #define generic_alloc_nodedata(nid) \ 169 ({ \ 170 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 171 }) 172 /* 173 * This definition is just for error path in node hotadd. 174 * For node hotremove, we have to replace this. 175 */ 176 #define generic_free_nodedata(pgdat) kfree(pgdat) 177 178 extern pg_data_t *node_data[]; 179 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 180 { 181 node_data[nid] = pgdat; 182 } 183 184 #else /* !CONFIG_NUMA */ 185 186 /* never called */ 187 static inline pg_data_t *generic_alloc_nodedata(int nid) 188 { 189 BUG(); 190 return NULL; 191 } 192 static inline void generic_free_nodedata(pg_data_t *pgdat) 193 { 194 } 195 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 196 { 197 } 198 #endif /* CONFIG_NUMA */ 199 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 200 201 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 202 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 203 #else 204 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 205 { 206 } 207 #endif 208 extern void put_page_bootmem(struct page *page); 209 extern void get_page_bootmem(unsigned long ingo, struct page *page, 210 unsigned long type); 211 212 void get_online_mems(void); 213 void put_online_mems(void); 214 215 void mem_hotplug_begin(void); 216 void mem_hotplug_done(void); 217 218 extern void set_zone_contiguous(struct zone *zone); 219 extern void clear_zone_contiguous(struct zone *zone); 220 221 #else /* ! CONFIG_MEMORY_HOTPLUG */ 222 #define pfn_to_online_page(pfn) \ 223 ({ \ 224 struct page *___page = NULL; \ 225 if (pfn_valid(pfn)) \ 226 ___page = pfn_to_page(pfn); \ 227 ___page; \ 228 }) 229 230 static inline unsigned zone_span_seqbegin(struct zone *zone) 231 { 232 return 0; 233 } 234 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 235 { 236 return 0; 237 } 238 static inline void zone_span_writelock(struct zone *zone) {} 239 static inline void zone_span_writeunlock(struct zone *zone) {} 240 static inline void zone_seqlock_init(struct zone *zone) {} 241 242 static inline int mhp_notimplemented(const char *func) 243 { 244 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 245 dump_stack(); 246 return -ENOSYS; 247 } 248 249 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 250 { 251 } 252 253 static inline int try_online_node(int nid) 254 { 255 return 0; 256 } 257 258 static inline void get_online_mems(void) {} 259 static inline void put_online_mems(void) {} 260 261 static inline void mem_hotplug_begin(void) {} 262 static inline void mem_hotplug_done(void) {} 263 264 static inline bool movable_node_is_enabled(void) 265 { 266 return false; 267 } 268 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 269 270 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) 271 /* 272 * pgdat resizing functions 273 */ 274 static inline 275 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 276 { 277 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 278 } 279 static inline 280 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 281 { 282 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 283 } 284 static inline 285 void pgdat_resize_init(struct pglist_data *pgdat) 286 { 287 spin_lock_init(&pgdat->node_size_lock); 288 } 289 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 290 /* 291 * Stub functions for when hotplug is off 292 */ 293 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 294 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 295 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 296 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 297 298 #ifdef CONFIG_MEMORY_HOTREMOVE 299 300 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 301 extern void try_offline_node(int nid); 302 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 303 extern void remove_memory(int nid, u64 start, u64 size); 304 extern void __remove_memory(int nid, u64 start, u64 size); 305 306 #else 307 static inline bool is_mem_section_removable(unsigned long pfn, 308 unsigned long nr_pages) 309 { 310 return false; 311 } 312 313 static inline void try_offline_node(int nid) {} 314 315 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 316 { 317 return -EINVAL; 318 } 319 320 static inline void remove_memory(int nid, u64 start, u64 size) {} 321 static inline void __remove_memory(int nid, u64 start, u64 size) {} 322 #endif /* CONFIG_MEMORY_HOTREMOVE */ 323 324 extern void __ref free_area_init_core_hotplug(int nid); 325 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 326 void *arg, int (*func)(struct memory_block *, void *)); 327 extern int __add_memory(int nid, u64 start, u64 size); 328 extern int add_memory(int nid, u64 start, u64 size); 329 extern int add_memory_resource(int nid, struct resource *resource, bool online); 330 extern int arch_add_memory(int nid, u64 start, u64 size, 331 struct vmem_altmap *altmap, bool want_memblock); 332 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 333 unsigned long nr_pages, struct vmem_altmap *altmap); 334 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 335 extern bool is_memblock_offlined(struct memory_block *mem); 336 extern int sparse_add_one_section(struct pglist_data *pgdat, 337 unsigned long start_pfn, struct vmem_altmap *altmap); 338 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms, 339 unsigned long map_offset, struct vmem_altmap *altmap); 340 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 341 unsigned long pnum); 342 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, 343 int online_type); 344 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, 345 unsigned long nr_pages); 346 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 347