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 int test_pages_in_a_zone(unsigned long, unsigned long); 88 extern void __offline_isolated_pages(unsigned long, unsigned long); 89 90 typedef void (*online_page_callback_t)(struct page *page); 91 92 extern int set_online_page_callback(online_page_callback_t callback); 93 extern int restore_online_page_callback(online_page_callback_t callback); 94 95 extern void __online_page_set_limits(struct page *page); 96 extern void __online_page_increment_counters(struct page *page); 97 extern void __online_page_free(struct page *page); 98 99 extern int try_online_node(int nid); 100 101 #ifdef CONFIG_MEMORY_HOTREMOVE 102 extern bool is_pageblock_removable_nolock(struct page *page); 103 extern int arch_remove_memory(u64 start, u64 size); 104 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 105 unsigned long nr_pages); 106 #endif /* CONFIG_MEMORY_HOTREMOVE */ 107 108 /* reasonably generic interface to expand the physical pages in a zone */ 109 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 110 unsigned long nr_pages); 111 112 #ifdef CONFIG_NUMA 113 extern int memory_add_physaddr_to_nid(u64 start); 114 #else 115 static inline int memory_add_physaddr_to_nid(u64 start) 116 { 117 return 0; 118 } 119 #endif 120 121 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 122 /* 123 * For supporting node-hotadd, we have to allocate a new pgdat. 124 * 125 * If an arch has generic style NODE_DATA(), 126 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 127 * 128 * In general, generic_alloc_nodedata() is used. 129 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 130 * 131 */ 132 extern pg_data_t *arch_alloc_nodedata(int nid); 133 extern void arch_free_nodedata(pg_data_t *pgdat); 134 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 135 136 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 137 138 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 139 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 140 141 #ifdef CONFIG_NUMA 142 /* 143 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 144 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 145 * Because, pgdat for the new node is not allocated/initialized yet itself. 146 * To use new node's memory, more consideration will be necessary. 147 */ 148 #define generic_alloc_nodedata(nid) \ 149 ({ \ 150 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 151 }) 152 /* 153 * This definition is just for error path in node hotadd. 154 * For node hotremove, we have to replace this. 155 */ 156 #define generic_free_nodedata(pgdat) kfree(pgdat) 157 158 extern pg_data_t *node_data[]; 159 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 160 { 161 node_data[nid] = pgdat; 162 } 163 164 #else /* !CONFIG_NUMA */ 165 166 /* never called */ 167 static inline pg_data_t *generic_alloc_nodedata(int nid) 168 { 169 BUG(); 170 return NULL; 171 } 172 static inline void generic_free_nodedata(pg_data_t *pgdat) 173 { 174 } 175 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 176 { 177 } 178 #endif /* CONFIG_NUMA */ 179 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 180 181 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 182 extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 183 #else 184 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 185 { 186 } 187 #endif 188 extern void put_page_bootmem(struct page *page); 189 extern void get_page_bootmem(unsigned long ingo, struct page *page, 190 unsigned long type); 191 192 void get_online_mems(void); 193 void put_online_mems(void); 194 195 #else /* ! CONFIG_MEMORY_HOTPLUG */ 196 /* 197 * Stub functions for when hotplug is off 198 */ 199 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 200 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 201 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 202 203 static inline unsigned zone_span_seqbegin(struct zone *zone) 204 { 205 return 0; 206 } 207 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 208 { 209 return 0; 210 } 211 static inline void zone_span_writelock(struct zone *zone) {} 212 static inline void zone_span_writeunlock(struct zone *zone) {} 213 static inline void zone_seqlock_init(struct zone *zone) {} 214 215 static inline int mhp_notimplemented(const char *func) 216 { 217 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 218 dump_stack(); 219 return -ENOSYS; 220 } 221 222 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 223 { 224 } 225 226 static inline int try_online_node(int nid) 227 { 228 return 0; 229 } 230 231 static inline void get_online_mems(void) {} 232 static inline void put_online_mems(void) {} 233 234 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 235 236 #ifdef CONFIG_MEMORY_HOTREMOVE 237 238 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 239 extern void try_offline_node(int nid); 240 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 241 extern void remove_memory(int nid, u64 start, u64 size); 242 243 #else 244 static inline int is_mem_section_removable(unsigned long pfn, 245 unsigned long nr_pages) 246 { 247 return 0; 248 } 249 250 static inline void try_offline_node(int nid) {} 251 252 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 253 { 254 return -EINVAL; 255 } 256 257 static inline void remove_memory(int nid, u64 start, u64 size) {} 258 #endif /* CONFIG_MEMORY_HOTREMOVE */ 259 260 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 261 void *arg, int (*func)(struct memory_block *, void *)); 262 extern int add_memory(int nid, u64 start, u64 size); 263 extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default); 264 extern int arch_add_memory(int nid, u64 start, u64 size); 265 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 266 extern bool is_memblock_offlined(struct memory_block *mem); 267 extern void remove_memory(int nid, u64 start, u64 size); 268 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn); 269 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 270 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 271 unsigned long pnum); 272 273 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 274