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 /* Offline the memory. */ 51 MMOP_OFFLINE = 0, 52 /* Online the memory. Zone depends, see default_zone_for_pfn(). */ 53 MMOP_ONLINE, 54 /* Online the memory to ZONE_NORMAL. */ 55 MMOP_ONLINE_KERNEL, 56 /* Online the memory to ZONE_MOVABLE. */ 57 MMOP_ONLINE_MOVABLE, 58 }; 59 60 /* 61 * Extended parameters for memory hotplug: 62 * altmap: alternative allocator for memmap array (optional) 63 * pgprot: page protection flags to apply to newly created page tables 64 * (required) 65 */ 66 struct mhp_params { 67 struct vmem_altmap *altmap; 68 pgprot_t pgprot; 69 }; 70 71 /* 72 * Zone resizing functions 73 * 74 * Note: any attempt to resize a zone should has pgdat_resize_lock() 75 * zone_span_writelock() both held. This ensure the size of a zone 76 * can't be changed while pgdat_resize_lock() held. 77 */ 78 static inline unsigned zone_span_seqbegin(struct zone *zone) 79 { 80 return read_seqbegin(&zone->span_seqlock); 81 } 82 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 83 { 84 return read_seqretry(&zone->span_seqlock, iv); 85 } 86 static inline void zone_span_writelock(struct zone *zone) 87 { 88 write_seqlock(&zone->span_seqlock); 89 } 90 static inline void zone_span_writeunlock(struct zone *zone) 91 { 92 write_sequnlock(&zone->span_seqlock); 93 } 94 static inline void zone_seqlock_init(struct zone *zone) 95 { 96 seqlock_init(&zone->span_seqlock); 97 } 98 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 99 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 100 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 101 /* VM interface that may be used by firmware interface */ 102 extern int online_pages(unsigned long pfn, unsigned long nr_pages, 103 int online_type, int nid); 104 extern struct zone *test_pages_in_a_zone(unsigned long start_pfn, 105 unsigned long end_pfn); 106 extern unsigned long __offline_isolated_pages(unsigned long start_pfn, 107 unsigned long end_pfn); 108 109 typedef void (*online_page_callback_t)(struct page *page, unsigned int order); 110 111 extern void generic_online_page(struct page *page, unsigned int order); 112 extern int set_online_page_callback(online_page_callback_t callback); 113 extern int restore_online_page_callback(online_page_callback_t callback); 114 115 extern int try_online_node(int nid); 116 117 extern int arch_add_memory(int nid, u64 start, u64 size, 118 struct mhp_params *params); 119 extern u64 max_mem_size; 120 121 extern int memhp_online_type_from_str(const char *str); 122 123 /* Default online_type (MMOP_*) when new memory blocks are added. */ 124 extern int memhp_default_online_type; 125 /* If movable_node boot option specified */ 126 extern bool movable_node_enabled; 127 static inline bool movable_node_is_enabled(void) 128 { 129 return movable_node_enabled; 130 } 131 132 extern void arch_remove_memory(int nid, u64 start, u64 size, 133 struct vmem_altmap *altmap); 134 extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages, 135 struct vmem_altmap *altmap); 136 137 /* reasonably generic interface to expand the physical pages */ 138 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 139 struct mhp_params *params); 140 141 #ifndef CONFIG_ARCH_HAS_ADD_PAGES 142 static inline int add_pages(int nid, unsigned long start_pfn, 143 unsigned long nr_pages, struct mhp_params *params) 144 { 145 return __add_pages(nid, start_pfn, nr_pages, params); 146 } 147 #else /* ARCH_HAS_ADD_PAGES */ 148 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, 149 struct mhp_params *params); 150 #endif /* ARCH_HAS_ADD_PAGES */ 151 152 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 153 /* 154 * For supporting node-hotadd, we have to allocate a new pgdat. 155 * 156 * If an arch has generic style NODE_DATA(), 157 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 158 * 159 * In general, generic_alloc_nodedata() is used. 160 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 161 * 162 */ 163 extern pg_data_t *arch_alloc_nodedata(int nid); 164 extern void arch_free_nodedata(pg_data_t *pgdat); 165 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 166 167 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 168 169 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 170 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 171 172 #ifdef CONFIG_NUMA 173 /* 174 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 175 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 176 * Because, pgdat for the new node is not allocated/initialized yet itself. 177 * To use new node's memory, more consideration will be necessary. 178 */ 179 #define generic_alloc_nodedata(nid) \ 180 ({ \ 181 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 182 }) 183 /* 184 * This definition is just for error path in node hotadd. 185 * For node hotremove, we have to replace this. 186 */ 187 #define generic_free_nodedata(pgdat) kfree(pgdat) 188 189 extern pg_data_t *node_data[]; 190 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 191 { 192 node_data[nid] = pgdat; 193 } 194 195 #else /* !CONFIG_NUMA */ 196 197 /* never called */ 198 static inline pg_data_t *generic_alloc_nodedata(int nid) 199 { 200 BUG(); 201 return NULL; 202 } 203 static inline void generic_free_nodedata(pg_data_t *pgdat) 204 { 205 } 206 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 207 { 208 } 209 #endif /* CONFIG_NUMA */ 210 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 211 212 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 213 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 214 #else 215 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 216 { 217 } 218 #endif 219 extern void put_page_bootmem(struct page *page); 220 extern void get_page_bootmem(unsigned long ingo, struct page *page, 221 unsigned long type); 222 223 void get_online_mems(void); 224 void put_online_mems(void); 225 226 void mem_hotplug_begin(void); 227 void mem_hotplug_done(void); 228 229 #else /* ! CONFIG_MEMORY_HOTPLUG */ 230 #define pfn_to_online_page(pfn) \ 231 ({ \ 232 struct page *___page = NULL; \ 233 if (pfn_valid(pfn)) \ 234 ___page = pfn_to_page(pfn); \ 235 ___page; \ 236 }) 237 238 static inline unsigned zone_span_seqbegin(struct zone *zone) 239 { 240 return 0; 241 } 242 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 243 { 244 return 0; 245 } 246 static inline void zone_span_writelock(struct zone *zone) {} 247 static inline void zone_span_writeunlock(struct zone *zone) {} 248 static inline void zone_seqlock_init(struct zone *zone) {} 249 250 static inline int mhp_notimplemented(const char *func) 251 { 252 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 253 dump_stack(); 254 return -ENOSYS; 255 } 256 257 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 258 { 259 } 260 261 static inline int try_online_node(int nid) 262 { 263 return 0; 264 } 265 266 static inline void get_online_mems(void) {} 267 static inline void put_online_mems(void) {} 268 269 static inline void mem_hotplug_begin(void) {} 270 static inline void mem_hotplug_done(void) {} 271 272 static inline bool movable_node_is_enabled(void) 273 { 274 return false; 275 } 276 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 277 278 #ifdef CONFIG_NUMA 279 extern int memory_add_physaddr_to_nid(u64 start); 280 extern int phys_to_target_node(u64 start); 281 #else 282 static inline int memory_add_physaddr_to_nid(u64 start) 283 { 284 return 0; 285 } 286 static inline int phys_to_target_node(u64 start) 287 { 288 return 0; 289 } 290 #endif 291 292 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) 293 /* 294 * pgdat resizing functions 295 */ 296 static inline 297 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 298 { 299 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 300 } 301 static inline 302 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 303 { 304 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 305 } 306 static inline 307 void pgdat_resize_init(struct pglist_data *pgdat) 308 { 309 spin_lock_init(&pgdat->node_size_lock); 310 } 311 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 312 /* 313 * Stub functions for when hotplug is off 314 */ 315 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 316 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 317 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 318 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 319 320 #ifdef CONFIG_MEMORY_HOTREMOVE 321 322 extern void try_offline_node(int nid); 323 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 324 extern int remove_memory(int nid, u64 start, u64 size); 325 extern void __remove_memory(int nid, u64 start, u64 size); 326 extern int offline_and_remove_memory(int nid, u64 start, u64 size); 327 328 #else 329 static inline void try_offline_node(int nid) {} 330 331 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 332 { 333 return -EINVAL; 334 } 335 336 static inline int remove_memory(int nid, u64 start, u64 size) 337 { 338 return -EBUSY; 339 } 340 341 static inline void __remove_memory(int nid, u64 start, u64 size) {} 342 #endif /* CONFIG_MEMORY_HOTREMOVE */ 343 344 extern void set_zone_contiguous(struct zone *zone); 345 extern void clear_zone_contiguous(struct zone *zone); 346 347 extern void __ref free_area_init_core_hotplug(int nid); 348 extern int __add_memory(int nid, u64 start, u64 size); 349 extern int add_memory(int nid, u64 start, u64 size); 350 extern int add_memory_resource(int nid, struct resource *resource); 351 extern int add_memory_driver_managed(int nid, u64 start, u64 size, 352 const char *resource_name); 353 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 354 unsigned long nr_pages, struct vmem_altmap *altmap); 355 extern void remove_pfn_range_from_zone(struct zone *zone, 356 unsigned long start_pfn, 357 unsigned long nr_pages); 358 extern bool is_memblock_offlined(struct memory_block *mem); 359 extern int sparse_add_section(int nid, unsigned long pfn, 360 unsigned long nr_pages, struct vmem_altmap *altmap); 361 extern void sparse_remove_section(struct mem_section *ms, 362 unsigned long pfn, unsigned long nr_pages, 363 unsigned long map_offset, struct vmem_altmap *altmap); 364 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 365 unsigned long pnum); 366 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, 367 int online_type); 368 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, 369 unsigned long nr_pages); 370 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 371