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 17 #ifdef CONFIG_MEMORY_HOTPLUG 18 /* 19 * Return page for the valid pfn only if the page is online. All pfn 20 * walkers which rely on the fully initialized page->flags and others 21 * should use this rather than pfn_valid && pfn_to_page 22 */ 23 #define pfn_to_online_page(pfn) \ 24 ({ \ 25 struct page *___page = NULL; \ 26 unsigned long ___nr = pfn_to_section_nr(pfn); \ 27 \ 28 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\ 29 ___page = pfn_to_page(pfn); \ 30 ___page; \ 31 }) 32 33 /* 34 * Types for free bootmem stored in page->lru.next. These have to be in 35 * some random range in unsigned long space for debugging purposes. 36 */ 37 enum { 38 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 39 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 40 MIX_SECTION_INFO, 41 NODE_INFO, 42 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 43 }; 44 45 /* Types for control the zone type of onlined and offlined memory */ 46 enum { 47 MMOP_OFFLINE = -1, 48 MMOP_ONLINE_KEEP, 49 MMOP_ONLINE_KERNEL, 50 MMOP_ONLINE_MOVABLE, 51 }; 52 53 /* 54 * pgdat resizing functions 55 */ 56 static inline pgdat_resize_lock(struct pglist_data * pgdat,unsigned long * flags)57 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 58 { 59 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 60 } 61 static inline pgdat_resize_unlock(struct pglist_data * pgdat,unsigned long * flags)62 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 63 { 64 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 65 } 66 static inline pgdat_resize_init(struct pglist_data * pgdat)67 void pgdat_resize_init(struct pglist_data *pgdat) 68 { 69 spin_lock_init(&pgdat->node_size_lock); 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 */ zone_span_seqbegin(struct zone * zone)78 static inline unsigned zone_span_seqbegin(struct zone *zone) 79 { 80 return read_seqbegin(&zone->span_seqlock); 81 } zone_span_seqretry(struct zone * zone,unsigned iv)82 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 83 { 84 return read_seqretry(&zone->span_seqlock, iv); 85 } zone_span_writelock(struct zone * zone)86 static inline void zone_span_writelock(struct zone *zone) 87 { 88 write_seqlock(&zone->span_seqlock); 89 } zone_span_writeunlock(struct zone * zone)90 static inline void zone_span_writeunlock(struct zone *zone) 91 { 92 write_sequnlock(&zone->span_seqlock); 93 } zone_seqlock_init(struct zone * zone)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, unsigned long, int); 103 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, 104 unsigned long *valid_start, unsigned long *valid_end); 105 extern void __offline_isolated_pages(unsigned long, unsigned long); 106 107 typedef void (*online_page_callback_t)(struct page *page); 108 109 extern int set_online_page_callback(online_page_callback_t callback); 110 extern int restore_online_page_callback(online_page_callback_t callback); 111 112 extern void __online_page_set_limits(struct page *page); 113 extern void __online_page_increment_counters(struct page *page); 114 extern void __online_page_free(struct page *page); 115 116 extern int try_online_node(int nid); 117 118 extern bool memhp_auto_online; 119 /* If movable_node boot option specified */ 120 extern bool movable_node_enabled; movable_node_is_enabled(void)121 static inline bool movable_node_is_enabled(void) 122 { 123 return movable_node_enabled; 124 } 125 126 #ifdef CONFIG_MEMORY_HOTREMOVE 127 extern bool is_pageblock_removable_nolock(struct page *page); 128 extern int arch_remove_memory(u64 start, u64 size); 129 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 130 unsigned long nr_pages); 131 #endif /* CONFIG_MEMORY_HOTREMOVE */ 132 133 /* reasonably generic interface to expand the physical pages */ 134 extern int __add_pages(int nid, unsigned long start_pfn, 135 unsigned long nr_pages, bool want_memblock); 136 137 #ifndef CONFIG_ARCH_HAS_ADD_PAGES add_pages(int nid,unsigned long start_pfn,unsigned long nr_pages,bool want_memblock)138 static inline int add_pages(int nid, unsigned long start_pfn, 139 unsigned long nr_pages, bool want_memblock) 140 { 141 return __add_pages(nid, start_pfn, nr_pages, want_memblock); 142 } 143 #else /* ARCH_HAS_ADD_PAGES */ 144 int add_pages(int nid, unsigned long start_pfn, 145 unsigned long nr_pages, bool want_memblock); 146 #endif /* ARCH_HAS_ADD_PAGES */ 147 148 #ifdef CONFIG_NUMA 149 extern int memory_add_physaddr_to_nid(u64 start); 150 #else memory_add_physaddr_to_nid(u64 start)151 static inline int memory_add_physaddr_to_nid(u64 start) 152 { 153 return 0; 154 } 155 #endif 156 157 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 158 /* 159 * For supporting node-hotadd, we have to allocate a new pgdat. 160 * 161 * If an arch has generic style NODE_DATA(), 162 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 163 * 164 * In general, generic_alloc_nodedata() is used. 165 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 166 * 167 */ 168 extern pg_data_t *arch_alloc_nodedata(int nid); 169 extern void arch_free_nodedata(pg_data_t *pgdat); 170 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 171 172 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 173 174 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 175 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 176 177 #ifdef CONFIG_NUMA 178 /* 179 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 180 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 181 * Because, pgdat for the new node is not allocated/initialized yet itself. 182 * To use new node's memory, more consideration will be necessary. 183 */ 184 #define generic_alloc_nodedata(nid) \ 185 ({ \ 186 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 187 }) 188 /* 189 * This definition is just for error path in node hotadd. 190 * For node hotremove, we have to replace this. 191 */ 192 #define generic_free_nodedata(pgdat) kfree(pgdat) 193 194 extern pg_data_t *node_data[]; arch_refresh_nodedata(int nid,pg_data_t * pgdat)195 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 196 { 197 node_data[nid] = pgdat; 198 } 199 200 #else /* !CONFIG_NUMA */ 201 202 /* never called */ generic_alloc_nodedata(int nid)203 static inline pg_data_t *generic_alloc_nodedata(int nid) 204 { 205 BUG(); 206 return NULL; 207 } generic_free_nodedata(pg_data_t * pgdat)208 static inline void generic_free_nodedata(pg_data_t *pgdat) 209 { 210 } arch_refresh_nodedata(int nid,pg_data_t * pgdat)211 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 212 { 213 } 214 #endif /* CONFIG_NUMA */ 215 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 216 217 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 218 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 219 #else register_page_bootmem_info_node(struct pglist_data * pgdat)220 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 221 { 222 } 223 #endif 224 extern void put_page_bootmem(struct page *page); 225 extern void get_page_bootmem(unsigned long ingo, struct page *page, 226 unsigned long type); 227 228 void get_online_mems(void); 229 void put_online_mems(void); 230 231 void mem_hotplug_begin(void); 232 void mem_hotplug_done(void); 233 234 extern void set_zone_contiguous(struct zone *zone); 235 extern void clear_zone_contiguous(struct zone *zone); 236 237 #else /* ! CONFIG_MEMORY_HOTPLUG */ 238 #define pfn_to_online_page(pfn) \ 239 ({ \ 240 struct page *___page = NULL; \ 241 if (pfn_valid(pfn)) \ 242 ___page = pfn_to_page(pfn); \ 243 ___page; \ 244 }) 245 246 /* 247 * Stub functions for when hotplug is off 248 */ pgdat_resize_lock(struct pglist_data * p,unsigned long * f)249 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} pgdat_resize_unlock(struct pglist_data * p,unsigned long * f)250 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} pgdat_resize_init(struct pglist_data * pgdat)251 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 252 zone_span_seqbegin(struct zone * zone)253 static inline unsigned zone_span_seqbegin(struct zone *zone) 254 { 255 return 0; 256 } zone_span_seqretry(struct zone * zone,unsigned iv)257 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 258 { 259 return 0; 260 } zone_span_writelock(struct zone * zone)261 static inline void zone_span_writelock(struct zone *zone) {} zone_span_writeunlock(struct zone * zone)262 static inline void zone_span_writeunlock(struct zone *zone) {} zone_seqlock_init(struct zone * zone)263 static inline void zone_seqlock_init(struct zone *zone) {} 264 mhp_notimplemented(const char * func)265 static inline int mhp_notimplemented(const char *func) 266 { 267 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 268 dump_stack(); 269 return -ENOSYS; 270 } 271 register_page_bootmem_info_node(struct pglist_data * pgdat)272 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 273 { 274 } 275 try_online_node(int nid)276 static inline int try_online_node(int nid) 277 { 278 return 0; 279 } 280 get_online_mems(void)281 static inline void get_online_mems(void) {} put_online_mems(void)282 static inline void put_online_mems(void) {} 283 mem_hotplug_begin(void)284 static inline void mem_hotplug_begin(void) {} mem_hotplug_done(void)285 static inline void mem_hotplug_done(void) {} 286 movable_node_is_enabled(void)287 static inline bool movable_node_is_enabled(void) 288 { 289 return false; 290 } 291 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 292 293 #ifdef CONFIG_MEMORY_HOTREMOVE 294 295 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 296 extern void try_offline_node(int nid); 297 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 298 extern void remove_memory(int nid, u64 start, u64 size); 299 300 #else is_mem_section_removable(unsigned long pfn,unsigned long nr_pages)301 static inline bool is_mem_section_removable(unsigned long pfn, 302 unsigned long nr_pages) 303 { 304 return false; 305 } 306 try_offline_node(int nid)307 static inline void try_offline_node(int nid) {} 308 offline_pages(unsigned long start_pfn,unsigned long nr_pages)309 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 310 { 311 return -EINVAL; 312 } 313 remove_memory(int nid,u64 start,u64 size)314 static inline void remove_memory(int nid, u64 start, u64 size) {} 315 #endif /* CONFIG_MEMORY_HOTREMOVE */ 316 317 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 318 void *arg, int (*func)(struct memory_block *, void *)); 319 extern int __add_memory(int nid, u64 start, u64 size); 320 extern int add_memory(int nid, u64 start, u64 size); 321 extern int add_memory_resource(int nid, struct resource *resource, bool online); 322 extern int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock); 323 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 324 unsigned long nr_pages); 325 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 326 extern bool is_memblock_offlined(struct memory_block *mem); 327 extern void remove_memory(int nid, u64 start, u64 size); 328 extern int sparse_add_one_section(struct pglist_data *pgdat, unsigned long start_pfn); 329 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms, 330 unsigned long map_offset); 331 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 332 unsigned long pnum); 333 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, 334 int online_type); 335 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, 336 unsigned long nr_pages); 337 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 338