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 extern int try_online_node(int nid); 98 99 #ifdef CONFIG_MEMORY_HOTREMOVE 100 extern bool is_pageblock_removable_nolock(struct page *page); 101 extern int arch_remove_memory(u64 start, u64 size); 102 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 103 unsigned long nr_pages); 104 #endif /* CONFIG_MEMORY_HOTREMOVE */ 105 106 /* reasonably generic interface to expand the physical pages in a zone */ 107 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 108 unsigned long nr_pages); 109 110 #ifdef CONFIG_NUMA 111 extern int memory_add_physaddr_to_nid(u64 start); 112 #else 113 static inline int memory_add_physaddr_to_nid(u64 start) 114 { 115 return 0; 116 } 117 #endif 118 119 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 120 /* 121 * For supporting node-hotadd, we have to allocate a new pgdat. 122 * 123 * If an arch has generic style NODE_DATA(), 124 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 125 * 126 * In general, generic_alloc_nodedata() is used. 127 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 128 * 129 */ 130 extern pg_data_t *arch_alloc_nodedata(int nid); 131 extern void arch_free_nodedata(pg_data_t *pgdat); 132 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 133 134 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 135 136 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 137 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 138 139 #ifdef CONFIG_NUMA 140 /* 141 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 142 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 143 * Because, pgdat for the new node is not allocated/initialized yet itself. 144 * To use new node's memory, more consideration will be necessary. 145 */ 146 #define generic_alloc_nodedata(nid) \ 147 ({ \ 148 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 149 }) 150 /* 151 * This definition is just for error path in node hotadd. 152 * For node hotremove, we have to replace this. 153 */ 154 #define generic_free_nodedata(pgdat) kfree(pgdat) 155 156 extern pg_data_t *node_data[]; 157 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 158 { 159 node_data[nid] = pgdat; 160 } 161 162 #else /* !CONFIG_NUMA */ 163 164 /* never called */ 165 static inline pg_data_t *generic_alloc_nodedata(int nid) 166 { 167 BUG(); 168 return NULL; 169 } 170 static inline void generic_free_nodedata(pg_data_t *pgdat) 171 { 172 } 173 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 174 { 175 } 176 #endif /* CONFIG_NUMA */ 177 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 178 179 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 180 extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 181 #else 182 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 183 { 184 } 185 #endif 186 extern void put_page_bootmem(struct page *page); 187 extern void get_page_bootmem(unsigned long ingo, struct page *page, 188 unsigned long type); 189 190 void get_online_mems(void); 191 void put_online_mems(void); 192 193 #else /* ! CONFIG_MEMORY_HOTPLUG */ 194 /* 195 * Stub functions for when hotplug is off 196 */ 197 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 198 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 199 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 200 201 static inline unsigned zone_span_seqbegin(struct zone *zone) 202 { 203 return 0; 204 } 205 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 206 { 207 return 0; 208 } 209 static inline void zone_span_writelock(struct zone *zone) {} 210 static inline void zone_span_writeunlock(struct zone *zone) {} 211 static inline void zone_seqlock_init(struct zone *zone) {} 212 213 static inline int mhp_notimplemented(const char *func) 214 { 215 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 216 dump_stack(); 217 return -ENOSYS; 218 } 219 220 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 221 { 222 } 223 224 static inline int try_online_node(int nid) 225 { 226 return 0; 227 } 228 229 static inline void get_online_mems(void) {} 230 static inline void put_online_mems(void) {} 231 232 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 233 234 #ifdef CONFIG_MEMORY_HOTREMOVE 235 236 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 237 extern void try_offline_node(int nid); 238 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 239 extern void remove_memory(int nid, u64 start, u64 size); 240 241 #else 242 static inline int is_mem_section_removable(unsigned long pfn, 243 unsigned long nr_pages) 244 { 245 return 0; 246 } 247 248 static inline void try_offline_node(int nid) {} 249 250 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 251 { 252 return -EINVAL; 253 } 254 255 static inline void remove_memory(int nid, u64 start, u64 size) {} 256 #endif /* CONFIG_MEMORY_HOTREMOVE */ 257 258 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 259 void *arg, int (*func)(struct memory_block *, void *)); 260 extern int add_memory(int nid, u64 start, u64 size); 261 extern int arch_add_memory(int nid, u64 start, u64 size); 262 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 263 extern bool is_memblock_offlined(struct memory_block *mem); 264 extern void remove_memory(int nid, u64 start, u64 size); 265 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn); 266 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 267 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 268 unsigned long pnum); 269 270 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 271