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