1 #ifndef __LINUX_MEMORY_HOTPLUG_H 2 #define __LINUX_MEMORY_HOTPLUG_H 3 4 #include <linux/mmzone.h> 5 #include <linux/spinlock.h> 6 #include <linux/notifier.h> 7 #include <linux/bug.h> 8 9 struct page; 10 struct zone; 11 struct pglist_data; 12 struct mem_section; 13 struct memory_block; 14 struct resource; 15 16 #ifdef CONFIG_MEMORY_HOTPLUG 17 /* 18 * Return page for the valid pfn only if the page is online. All pfn 19 * walkers which rely on the fully initialized page->flags and others 20 * should use this rather than pfn_valid && pfn_to_page 21 */ 22 #define pfn_to_online_page(pfn) \ 23 ({ \ 24 struct page *___page = NULL; \ 25 unsigned long ___nr = pfn_to_section_nr(pfn); \ 26 \ 27 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\ 28 ___page = pfn_to_page(pfn); \ 29 ___page; \ 30 }) 31 32 /* 33 * Types for free bootmem stored in page->lru.next. These have to be in 34 * some random range in unsigned long space for debugging purposes. 35 */ 36 enum { 37 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 38 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 39 MIX_SECTION_INFO, 40 NODE_INFO, 41 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 42 }; 43 44 /* Types for control the zone type of onlined and offlined memory */ 45 enum { 46 MMOP_OFFLINE = -1, 47 MMOP_ONLINE_KEEP, 48 MMOP_ONLINE_KERNEL, 49 MMOP_ONLINE_MOVABLE, 50 }; 51 52 /* 53 * pgdat resizing functions 54 */ 55 static inline 56 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 57 { 58 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 59 } 60 static inline 61 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 62 { 63 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 64 } 65 static inline 66 void pgdat_resize_init(struct pglist_data *pgdat) 67 { 68 spin_lock_init(&pgdat->node_size_lock); 69 } 70 /* 71 * Zone resizing functions 72 * 73 * Note: any attempt to resize a zone should has pgdat_resize_lock() 74 * zone_span_writelock() both held. This ensure the size of a zone 75 * can't be changed while pgdat_resize_lock() held. 76 */ 77 static inline unsigned zone_span_seqbegin(struct zone *zone) 78 { 79 return read_seqbegin(&zone->span_seqlock); 80 } 81 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 82 { 83 return read_seqretry(&zone->span_seqlock, iv); 84 } 85 static inline void zone_span_writelock(struct zone *zone) 86 { 87 write_seqlock(&zone->span_seqlock); 88 } 89 static inline void zone_span_writeunlock(struct zone *zone) 90 { 91 write_sequnlock(&zone->span_seqlock); 92 } 93 static inline void zone_seqlock_init(struct zone *zone) 94 { 95 seqlock_init(&zone->span_seqlock); 96 } 97 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 98 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 99 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 100 /* VM interface that may be used by firmware interface */ 101 extern int online_pages(unsigned long, unsigned long, int); 102 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, 103 unsigned long *valid_start, unsigned long *valid_end); 104 extern void __offline_isolated_pages(unsigned long, unsigned long); 105 106 typedef void (*online_page_callback_t)(struct page *page); 107 108 extern int set_online_page_callback(online_page_callback_t callback); 109 extern int restore_online_page_callback(online_page_callback_t callback); 110 111 extern void __online_page_set_limits(struct page *page); 112 extern void __online_page_increment_counters(struct page *page); 113 extern void __online_page_free(struct page *page); 114 115 extern int try_online_node(int nid); 116 117 extern bool memhp_auto_online; 118 /* If movable_node boot option specified */ 119 extern bool movable_node_enabled; 120 static inline bool movable_node_is_enabled(void) 121 { 122 return movable_node_enabled; 123 } 124 125 #ifdef CONFIG_MEMORY_HOTREMOVE 126 extern bool is_pageblock_removable_nolock(struct page *page); 127 extern int arch_remove_memory(u64 start, u64 size); 128 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 129 unsigned long nr_pages); 130 #endif /* CONFIG_MEMORY_HOTREMOVE */ 131 132 /* reasonably generic interface to expand the physical pages */ 133 extern int __add_pages(int nid, unsigned long start_pfn, 134 unsigned long nr_pages, bool want_memblock); 135 136 #ifndef CONFIG_ARCH_HAS_ADD_PAGES 137 static inline int add_pages(int nid, unsigned long start_pfn, 138 unsigned long nr_pages, bool want_memblock) 139 { 140 return __add_pages(nid, start_pfn, nr_pages, want_memblock); 141 } 142 #else /* ARCH_HAS_ADD_PAGES */ 143 int add_pages(int nid, unsigned long start_pfn, 144 unsigned long nr_pages, bool want_memblock); 145 #endif /* ARCH_HAS_ADD_PAGES */ 146 147 #ifdef CONFIG_NUMA 148 extern int memory_add_physaddr_to_nid(u64 start); 149 #else 150 static inline int memory_add_physaddr_to_nid(u64 start) 151 { 152 return 0; 153 } 154 #endif 155 156 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 157 /* 158 * For supporting node-hotadd, we have to allocate a new pgdat. 159 * 160 * If an arch has generic style NODE_DATA(), 161 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 162 * 163 * In general, generic_alloc_nodedata() is used. 164 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 165 * 166 */ 167 extern pg_data_t *arch_alloc_nodedata(int nid); 168 extern void arch_free_nodedata(pg_data_t *pgdat); 169 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 170 171 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 172 173 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 174 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 175 176 #ifdef CONFIG_NUMA 177 /* 178 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 179 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 180 * Because, pgdat for the new node is not allocated/initialized yet itself. 181 * To use new node's memory, more consideration will be necessary. 182 */ 183 #define generic_alloc_nodedata(nid) \ 184 ({ \ 185 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 186 }) 187 /* 188 * This definition is just for error path in node hotadd. 189 * For node hotremove, we have to replace this. 190 */ 191 #define generic_free_nodedata(pgdat) kfree(pgdat) 192 193 extern pg_data_t *node_data[]; 194 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 195 { 196 node_data[nid] = pgdat; 197 } 198 199 #else /* !CONFIG_NUMA */ 200 201 /* never called */ 202 static inline pg_data_t *generic_alloc_nodedata(int nid) 203 { 204 BUG(); 205 return NULL; 206 } 207 static inline void generic_free_nodedata(pg_data_t *pgdat) 208 { 209 } 210 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 211 { 212 } 213 #endif /* CONFIG_NUMA */ 214 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 215 216 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 217 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 218 #else 219 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 220 { 221 } 222 #endif 223 extern void put_page_bootmem(struct page *page); 224 extern void get_page_bootmem(unsigned long ingo, struct page *page, 225 unsigned long type); 226 227 void get_online_mems(void); 228 void put_online_mems(void); 229 230 void mem_hotplug_begin(void); 231 void mem_hotplug_done(void); 232 233 extern void set_zone_contiguous(struct zone *zone); 234 extern void clear_zone_contiguous(struct zone *zone); 235 236 #else /* ! CONFIG_MEMORY_HOTPLUG */ 237 #define pfn_to_online_page(pfn) \ 238 ({ \ 239 struct page *___page = NULL; \ 240 if (pfn_valid(pfn)) \ 241 ___page = pfn_to_page(pfn); \ 242 ___page; \ 243 }) 244 245 /* 246 * Stub functions for when hotplug is off 247 */ 248 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 249 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 250 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 251 252 static inline unsigned zone_span_seqbegin(struct zone *zone) 253 { 254 return 0; 255 } 256 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 257 { 258 return 0; 259 } 260 static inline void zone_span_writelock(struct zone *zone) {} 261 static inline void zone_span_writeunlock(struct zone *zone) {} 262 static inline void zone_seqlock_init(struct zone *zone) {} 263 264 static inline int mhp_notimplemented(const char *func) 265 { 266 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 267 dump_stack(); 268 return -ENOSYS; 269 } 270 271 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 272 { 273 } 274 275 static inline int try_online_node(int nid) 276 { 277 return 0; 278 } 279 280 static inline void get_online_mems(void) {} 281 static inline void put_online_mems(void) {} 282 283 static inline void mem_hotplug_begin(void) {} 284 static inline void mem_hotplug_done(void) {} 285 286 static inline bool movable_node_is_enabled(void) 287 { 288 return false; 289 } 290 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 291 292 #ifdef CONFIG_MEMORY_HOTREMOVE 293 294 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 295 extern void try_offline_node(int nid); 296 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 297 extern void remove_memory(int nid, u64 start, u64 size); 298 299 #else 300 static inline bool is_mem_section_removable(unsigned long pfn, 301 unsigned long nr_pages) 302 { 303 return false; 304 } 305 306 static inline void try_offline_node(int nid) {} 307 308 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 309 { 310 return -EINVAL; 311 } 312 313 static inline void remove_memory(int nid, u64 start, u64 size) {} 314 #endif /* CONFIG_MEMORY_HOTREMOVE */ 315 316 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 317 void *arg, int (*func)(struct memory_block *, void *)); 318 extern int add_memory(int nid, u64 start, u64 size); 319 extern int add_memory_resource(int nid, struct resource *resource, bool online); 320 extern int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock); 321 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 322 unsigned long nr_pages); 323 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 324 extern bool is_memblock_offlined(struct memory_block *mem); 325 extern void remove_memory(int nid, u64 start, u64 size); 326 extern int sparse_add_one_section(struct pglist_data *pgdat, unsigned long start_pfn); 327 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms, 328 unsigned long map_offset); 329 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 330 unsigned long pnum); 331 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, 332 int online_type); 333 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, 334 unsigned long nr_pages); 335 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 336