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 15 #ifdef CONFIG_MEMORY_HOTPLUG 16 17 /* 18 * Types for free bootmem stored in page->lru.next. These have to be in 19 * some random range in unsigned long space for debugging purposes. 20 */ 21 enum { 22 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 23 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 24 MIX_SECTION_INFO, 25 NODE_INFO, 26 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 27 }; 28 29 /* Types for control the zone type of onlined memory */ 30 enum { 31 ONLINE_KEEP, 32 ONLINE_KERNEL, 33 ONLINE_MOVABLE, 34 }; 35 36 /* 37 * pgdat resizing functions 38 */ 39 static inline 40 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 41 { 42 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 43 } 44 static inline 45 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 46 { 47 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 48 } 49 static inline 50 void pgdat_resize_init(struct pglist_data *pgdat) 51 { 52 spin_lock_init(&pgdat->node_size_lock); 53 } 54 /* 55 * Zone resizing functions 56 * 57 * Note: any attempt to resize a zone should has pgdat_resize_lock() 58 * zone_span_writelock() both held. This ensure the size of a zone 59 * can't be changed while pgdat_resize_lock() held. 60 */ 61 static inline unsigned zone_span_seqbegin(struct zone *zone) 62 { 63 return read_seqbegin(&zone->span_seqlock); 64 } 65 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 66 { 67 return read_seqretry(&zone->span_seqlock, iv); 68 } 69 static inline void zone_span_writelock(struct zone *zone) 70 { 71 write_seqlock(&zone->span_seqlock); 72 } 73 static inline void zone_span_writeunlock(struct zone *zone) 74 { 75 write_sequnlock(&zone->span_seqlock); 76 } 77 static inline void zone_seqlock_init(struct zone *zone) 78 { 79 seqlock_init(&zone->span_seqlock); 80 } 81 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 82 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 83 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 84 /* VM interface that may be used by firmware interface */ 85 extern int online_pages(unsigned long, unsigned long, int); 86 extern void __offline_isolated_pages(unsigned long, unsigned long); 87 88 typedef void (*online_page_callback_t)(struct page *page); 89 90 extern int set_online_page_callback(online_page_callback_t callback); 91 extern int restore_online_page_callback(online_page_callback_t callback); 92 93 extern void __online_page_set_limits(struct page *page); 94 extern void __online_page_increment_counters(struct page *page); 95 extern void __online_page_free(struct page *page); 96 97 #ifdef CONFIG_MEMORY_HOTREMOVE 98 extern bool is_pageblock_removable_nolock(struct page *page); 99 extern int arch_remove_memory(u64 start, u64 size); 100 #endif /* CONFIG_MEMORY_HOTREMOVE */ 101 102 /* reasonably generic interface to expand the physical pages in a zone */ 103 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 104 unsigned long nr_pages); 105 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 106 unsigned long nr_pages); 107 108 #ifdef CONFIG_NUMA 109 extern int memory_add_physaddr_to_nid(u64 start); 110 #else 111 static inline int memory_add_physaddr_to_nid(u64 start) 112 { 113 return 0; 114 } 115 #endif 116 117 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 118 /* 119 * For supporting node-hotadd, we have to allocate a new pgdat. 120 * 121 * If an arch has generic style NODE_DATA(), 122 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 123 * 124 * In general, generic_alloc_nodedata() is used. 125 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 126 * 127 */ 128 extern pg_data_t *arch_alloc_nodedata(int nid); 129 extern void arch_free_nodedata(pg_data_t *pgdat); 130 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 131 132 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 133 134 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 135 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 136 137 #ifdef CONFIG_NUMA 138 /* 139 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 140 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 141 * Because, pgdat for the new node is not allocated/initialized yet itself. 142 * To use new node's memory, more consideration will be necessary. 143 */ 144 #define generic_alloc_nodedata(nid) \ 145 ({ \ 146 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 147 }) 148 /* 149 * This definition is just for error path in node hotadd. 150 * For node hotremove, we have to replace this. 151 */ 152 #define generic_free_nodedata(pgdat) kfree(pgdat) 153 154 extern pg_data_t *node_data[]; 155 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 156 { 157 node_data[nid] = pgdat; 158 } 159 160 #else /* !CONFIG_NUMA */ 161 162 /* never called */ 163 static inline pg_data_t *generic_alloc_nodedata(int nid) 164 { 165 BUG(); 166 return NULL; 167 } 168 static inline void generic_free_nodedata(pg_data_t *pgdat) 169 { 170 } 171 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 172 { 173 } 174 #endif /* CONFIG_NUMA */ 175 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 176 177 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 178 extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 179 #else 180 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 181 { 182 } 183 #endif 184 extern void put_page_bootmem(struct page *page); 185 extern void get_page_bootmem(unsigned long ingo, struct page *page, 186 unsigned long type); 187 188 /* 189 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug 190 * notifier will be called under this. 2) offline/online/add/remove memory 191 * will not run simultaneously. 192 */ 193 194 void lock_memory_hotplug(void); 195 void unlock_memory_hotplug(void); 196 197 #else /* ! CONFIG_MEMORY_HOTPLUG */ 198 /* 199 * Stub functions for when hotplug is off 200 */ 201 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 202 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 203 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 204 205 static inline unsigned zone_span_seqbegin(struct zone *zone) 206 { 207 return 0; 208 } 209 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 210 { 211 return 0; 212 } 213 static inline void zone_span_writelock(struct zone *zone) {} 214 static inline void zone_span_writeunlock(struct zone *zone) {} 215 static inline void zone_seqlock_init(struct zone *zone) {} 216 217 static inline int mhp_notimplemented(const char *func) 218 { 219 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 220 dump_stack(); 221 return -ENOSYS; 222 } 223 224 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 225 { 226 } 227 228 static inline void lock_memory_hotplug(void) {} 229 static inline void unlock_memory_hotplug(void) {} 230 231 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 232 233 #ifdef CONFIG_MEMORY_HOTREMOVE 234 235 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 236 extern void try_offline_node(int nid); 237 238 #else 239 static inline int is_mem_section_removable(unsigned long pfn, 240 unsigned long nr_pages) 241 { 242 return 0; 243 } 244 245 static inline void try_offline_node(int nid) {} 246 #endif /* CONFIG_MEMORY_HOTREMOVE */ 247 248 extern int mem_online_node(int nid); 249 extern int add_memory(int nid, u64 start, u64 size); 250 extern int arch_add_memory(int nid, u64 start, u64 size); 251 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 252 extern int offline_memory_block(struct memory_block *mem); 253 extern bool is_memblock_offlined(struct memory_block *mem); 254 extern int remove_memory(int nid, u64 start, u64 size); 255 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, 256 int nr_pages); 257 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 258 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 259 unsigned long pnum); 260 261 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 262