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