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 and offlined memory */ 30 enum { 31 MMOP_OFFLINE = -1, 32 MMOP_ONLINE_KEEP, 33 MMOP_ONLINE_KERNEL, 34 MMOP_ONLINE_MOVABLE, 35 }; 36 37 /* 38 * pgdat resizing functions 39 */ 40 static inline 41 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 42 { 43 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 44 } 45 static inline 46 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 47 { 48 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 49 } 50 static inline 51 void pgdat_resize_init(struct pglist_data *pgdat) 52 { 53 spin_lock_init(&pgdat->node_size_lock); 54 } 55 /* 56 * Zone resizing functions 57 * 58 * Note: any attempt to resize a zone should has pgdat_resize_lock() 59 * zone_span_writelock() both held. This ensure the size of a zone 60 * can't be changed while pgdat_resize_lock() held. 61 */ 62 static inline unsigned zone_span_seqbegin(struct zone *zone) 63 { 64 return read_seqbegin(&zone->span_seqlock); 65 } 66 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 67 { 68 return read_seqretry(&zone->span_seqlock, iv); 69 } 70 static inline void zone_span_writelock(struct zone *zone) 71 { 72 write_seqlock(&zone->span_seqlock); 73 } 74 static inline void zone_span_writeunlock(struct zone *zone) 75 { 76 write_sequnlock(&zone->span_seqlock); 77 } 78 static inline void zone_seqlock_init(struct zone *zone) 79 { 80 seqlock_init(&zone->span_seqlock); 81 } 82 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 83 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 84 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 85 /* VM interface that may be used by firmware interface */ 86 extern int online_pages(unsigned long, unsigned long, int); 87 extern void __offline_isolated_pages(unsigned long, unsigned long); 88 89 typedef void (*online_page_callback_t)(struct page *page); 90 91 extern int set_online_page_callback(online_page_callback_t callback); 92 extern int restore_online_page_callback(online_page_callback_t callback); 93 94 extern void __online_page_set_limits(struct page *page); 95 extern void __online_page_increment_counters(struct page *page); 96 extern void __online_page_free(struct page *page); 97 98 extern int try_online_node(int nid); 99 100 #ifdef CONFIG_MEMORY_HOTREMOVE 101 extern bool is_pageblock_removable_nolock(struct page *page); 102 extern int arch_remove_memory(u64 start, u64 size); 103 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 104 unsigned long nr_pages); 105 #endif /* CONFIG_MEMORY_HOTREMOVE */ 106 107 /* reasonably generic interface to expand the physical pages in a zone */ 108 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 109 unsigned long nr_pages); 110 111 #ifdef CONFIG_NUMA 112 extern int memory_add_physaddr_to_nid(u64 start); 113 #else 114 static inline int memory_add_physaddr_to_nid(u64 start) 115 { 116 return 0; 117 } 118 #endif 119 120 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 121 /* 122 * For supporting node-hotadd, we have to allocate a new pgdat. 123 * 124 * If an arch has generic style NODE_DATA(), 125 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 126 * 127 * In general, generic_alloc_nodedata() is used. 128 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 129 * 130 */ 131 extern pg_data_t *arch_alloc_nodedata(int nid); 132 extern void arch_free_nodedata(pg_data_t *pgdat); 133 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 134 135 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 136 137 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 138 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 139 140 #ifdef CONFIG_NUMA 141 /* 142 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 143 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 144 * Because, pgdat for the new node is not allocated/initialized yet itself. 145 * To use new node's memory, more consideration will be necessary. 146 */ 147 #define generic_alloc_nodedata(nid) \ 148 ({ \ 149 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 150 }) 151 /* 152 * This definition is just for error path in node hotadd. 153 * For node hotremove, we have to replace this. 154 */ 155 #define generic_free_nodedata(pgdat) kfree(pgdat) 156 157 extern pg_data_t *node_data[]; 158 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 159 { 160 node_data[nid] = pgdat; 161 } 162 163 #else /* !CONFIG_NUMA */ 164 165 /* never called */ 166 static inline pg_data_t *generic_alloc_nodedata(int nid) 167 { 168 BUG(); 169 return NULL; 170 } 171 static inline void generic_free_nodedata(pg_data_t *pgdat) 172 { 173 } 174 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 175 { 176 } 177 #endif /* CONFIG_NUMA */ 178 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 179 180 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 181 extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 182 #else 183 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 184 { 185 } 186 #endif 187 extern void put_page_bootmem(struct page *page); 188 extern void get_page_bootmem(unsigned long ingo, struct page *page, 189 unsigned long type); 190 191 void get_online_mems(void); 192 void put_online_mems(void); 193 194 #else /* ! CONFIG_MEMORY_HOTPLUG */ 195 /* 196 * Stub functions for when hotplug is off 197 */ 198 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 199 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 200 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 201 202 static inline unsigned zone_span_seqbegin(struct zone *zone) 203 { 204 return 0; 205 } 206 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 207 { 208 return 0; 209 } 210 static inline void zone_span_writelock(struct zone *zone) {} 211 static inline void zone_span_writeunlock(struct zone *zone) {} 212 static inline void zone_seqlock_init(struct zone *zone) {} 213 214 static inline int mhp_notimplemented(const char *func) 215 { 216 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 217 dump_stack(); 218 return -ENOSYS; 219 } 220 221 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 222 { 223 } 224 225 static inline int try_online_node(int nid) 226 { 227 return 0; 228 } 229 230 static inline void get_online_mems(void) {} 231 static inline void put_online_mems(void) {} 232 233 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 234 235 #ifdef CONFIG_MEMORY_HOTREMOVE 236 237 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 238 extern void try_offline_node(int nid); 239 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 240 extern void remove_memory(int nid, u64 start, u64 size); 241 242 #else 243 static inline int is_mem_section_removable(unsigned long pfn, 244 unsigned long nr_pages) 245 { 246 return 0; 247 } 248 249 static inline void try_offline_node(int nid) {} 250 251 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 252 { 253 return -EINVAL; 254 } 255 256 static inline void remove_memory(int nid, u64 start, u64 size) {} 257 #endif /* CONFIG_MEMORY_HOTREMOVE */ 258 259 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 260 void *arg, int (*func)(struct memory_block *, void *)); 261 extern int add_memory(int nid, u64 start, u64 size); 262 extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default); 263 extern int arch_add_memory(int nid, u64 start, u64 size); 264 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 265 extern bool is_memblock_offlined(struct memory_block *mem); 266 extern void remove_memory(int nid, u64 start, u64 size); 267 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn); 268 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 269 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 270 unsigned long pnum); 271 272 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 273