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_NUMA 153 extern int memory_add_physaddr_to_nid(u64 start); 154 #else 155 static inline int memory_add_physaddr_to_nid(u64 start) 156 { 157 return 0; 158 } 159 #endif 160 161 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 162 /* 163 * For supporting node-hotadd, we have to allocate a new pgdat. 164 * 165 * If an arch has generic style NODE_DATA(), 166 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 167 * 168 * In general, generic_alloc_nodedata() is used. 169 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 170 * 171 */ 172 extern pg_data_t *arch_alloc_nodedata(int nid); 173 extern void arch_free_nodedata(pg_data_t *pgdat); 174 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 175 176 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 177 178 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 179 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 180 181 #ifdef CONFIG_NUMA 182 /* 183 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 184 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 185 * Because, pgdat for the new node is not allocated/initialized yet itself. 186 * To use new node's memory, more consideration will be necessary. 187 */ 188 #define generic_alloc_nodedata(nid) \ 189 ({ \ 190 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 191 }) 192 /* 193 * This definition is just for error path in node hotadd. 194 * For node hotremove, we have to replace this. 195 */ 196 #define generic_free_nodedata(pgdat) kfree(pgdat) 197 198 extern pg_data_t *node_data[]; 199 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 200 { 201 node_data[nid] = pgdat; 202 } 203 204 #else /* !CONFIG_NUMA */ 205 206 /* never called */ 207 static inline pg_data_t *generic_alloc_nodedata(int nid) 208 { 209 BUG(); 210 return NULL; 211 } 212 static inline void generic_free_nodedata(pg_data_t *pgdat) 213 { 214 } 215 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 216 { 217 } 218 #endif /* CONFIG_NUMA */ 219 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 220 221 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 222 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 223 #else 224 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 225 { 226 } 227 #endif 228 extern void put_page_bootmem(struct page *page); 229 extern void get_page_bootmem(unsigned long ingo, struct page *page, 230 unsigned long type); 231 232 void get_online_mems(void); 233 void put_online_mems(void); 234 235 void mem_hotplug_begin(void); 236 void mem_hotplug_done(void); 237 238 #else /* ! CONFIG_MEMORY_HOTPLUG */ 239 #define pfn_to_online_page(pfn) \ 240 ({ \ 241 struct page *___page = NULL; \ 242 if (pfn_valid(pfn)) \ 243 ___page = pfn_to_page(pfn); \ 244 ___page; \ 245 }) 246 247 static inline unsigned zone_span_seqbegin(struct zone *zone) 248 { 249 return 0; 250 } 251 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 252 { 253 return 0; 254 } 255 static inline void zone_span_writelock(struct zone *zone) {} 256 static inline void zone_span_writeunlock(struct zone *zone) {} 257 static inline void zone_seqlock_init(struct zone *zone) {} 258 259 static inline int mhp_notimplemented(const char *func) 260 { 261 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 262 dump_stack(); 263 return -ENOSYS; 264 } 265 266 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 267 { 268 } 269 270 static inline int try_online_node(int nid) 271 { 272 return 0; 273 } 274 275 static inline void get_online_mems(void) {} 276 static inline void put_online_mems(void) {} 277 278 static inline void mem_hotplug_begin(void) {} 279 static inline void mem_hotplug_done(void) {} 280 281 static inline bool movable_node_is_enabled(void) 282 { 283 return false; 284 } 285 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 286 287 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) 288 /* 289 * pgdat resizing functions 290 */ 291 static inline 292 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 293 { 294 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 295 } 296 static inline 297 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 298 { 299 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 300 } 301 static inline 302 void pgdat_resize_init(struct pglist_data *pgdat) 303 { 304 spin_lock_init(&pgdat->node_size_lock); 305 } 306 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 307 /* 308 * Stub functions for when hotplug is off 309 */ 310 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 311 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 312 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 313 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ 314 315 #ifdef CONFIG_MEMORY_HOTREMOVE 316 317 extern void try_offline_node(int nid); 318 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 319 extern int remove_memory(int nid, u64 start, u64 size); 320 extern void __remove_memory(int nid, u64 start, u64 size); 321 extern int offline_and_remove_memory(int nid, u64 start, u64 size); 322 323 #else 324 static inline void try_offline_node(int nid) {} 325 326 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 327 { 328 return -EINVAL; 329 } 330 331 static inline int remove_memory(int nid, u64 start, u64 size) 332 { 333 return -EBUSY; 334 } 335 336 static inline void __remove_memory(int nid, u64 start, u64 size) {} 337 #endif /* CONFIG_MEMORY_HOTREMOVE */ 338 339 extern void set_zone_contiguous(struct zone *zone); 340 extern void clear_zone_contiguous(struct zone *zone); 341 342 extern void __ref free_area_init_core_hotplug(int nid); 343 extern int __add_memory(int nid, u64 start, u64 size); 344 extern int add_memory(int nid, u64 start, u64 size); 345 extern int add_memory_resource(int nid, struct resource *resource); 346 extern int add_memory_driver_managed(int nid, u64 start, u64 size, 347 const char *resource_name); 348 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 349 unsigned long nr_pages, struct vmem_altmap *altmap); 350 extern void remove_pfn_range_from_zone(struct zone *zone, 351 unsigned long start_pfn, 352 unsigned long nr_pages); 353 extern bool is_memblock_offlined(struct memory_block *mem); 354 extern int sparse_add_section(int nid, unsigned long pfn, 355 unsigned long nr_pages, struct vmem_altmap *altmap); 356 extern void sparse_remove_section(struct mem_section *ms, 357 unsigned long pfn, unsigned long nr_pages, 358 unsigned long map_offset, struct vmem_altmap *altmap); 359 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 360 unsigned long pnum); 361 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, 362 int online_type); 363 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, 364 unsigned long nr_pages); 365 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 366