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 /* 19 * Types for free bootmem stored in page->lru.next. These have to be in 20 * some random range in unsigned long space for debugging purposes. 21 */ 22 enum { 23 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 24 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 25 MIX_SECTION_INFO, 26 NODE_INFO, 27 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 28 }; 29 30 /* Types for control the zone type of onlined and offlined memory */ 31 enum { 32 MMOP_OFFLINE = -1, 33 MMOP_ONLINE_KEEP, 34 MMOP_ONLINE_KERNEL, 35 MMOP_ONLINE_MOVABLE, 36 }; 37 38 /* 39 * pgdat resizing functions 40 */ 41 static inline 42 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 43 { 44 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 45 } 46 static inline 47 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 48 { 49 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 50 } 51 static inline 52 void pgdat_resize_init(struct pglist_data *pgdat) 53 { 54 spin_lock_init(&pgdat->node_size_lock); 55 } 56 /* 57 * Zone resizing functions 58 * 59 * Note: any attempt to resize a zone should has pgdat_resize_lock() 60 * zone_span_writelock() both held. This ensure the size of a zone 61 * can't be changed while pgdat_resize_lock() held. 62 */ 63 static inline unsigned zone_span_seqbegin(struct zone *zone) 64 { 65 return read_seqbegin(&zone->span_seqlock); 66 } 67 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 68 { 69 return read_seqretry(&zone->span_seqlock, iv); 70 } 71 static inline void zone_span_writelock(struct zone *zone) 72 { 73 write_seqlock(&zone->span_seqlock); 74 } 75 static inline void zone_span_writeunlock(struct zone *zone) 76 { 77 write_sequnlock(&zone->span_seqlock); 78 } 79 static inline void zone_seqlock_init(struct zone *zone) 80 { 81 seqlock_init(&zone->span_seqlock); 82 } 83 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 84 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 85 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 86 /* VM interface that may be used by firmware interface */ 87 extern int online_pages(unsigned long, unsigned long, int); 88 extern int test_pages_in_a_zone(unsigned long, unsigned long); 89 extern void __offline_isolated_pages(unsigned long, unsigned long); 90 91 typedef void (*online_page_callback_t)(struct page *page); 92 93 extern int set_online_page_callback(online_page_callback_t callback); 94 extern int restore_online_page_callback(online_page_callback_t callback); 95 96 extern void __online_page_set_limits(struct page *page); 97 extern void __online_page_increment_counters(struct page *page); 98 extern void __online_page_free(struct page *page); 99 100 extern int try_online_node(int nid); 101 102 extern bool memhp_auto_online; 103 104 #ifdef CONFIG_MEMORY_HOTREMOVE 105 extern bool is_pageblock_removable_nolock(struct page *page); 106 extern int arch_remove_memory(u64 start, u64 size); 107 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 108 unsigned long nr_pages); 109 #endif /* CONFIG_MEMORY_HOTREMOVE */ 110 111 /* reasonably generic interface to expand the physical pages in a zone */ 112 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 113 unsigned long nr_pages); 114 115 #ifdef CONFIG_NUMA 116 extern int memory_add_physaddr_to_nid(u64 start); 117 #else 118 static inline int memory_add_physaddr_to_nid(u64 start) 119 { 120 return 0; 121 } 122 #endif 123 124 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 125 /* 126 * For supporting node-hotadd, we have to allocate a new pgdat. 127 * 128 * If an arch has generic style NODE_DATA(), 129 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 130 * 131 * In general, generic_alloc_nodedata() is used. 132 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 133 * 134 */ 135 extern pg_data_t *arch_alloc_nodedata(int nid); 136 extern void arch_free_nodedata(pg_data_t *pgdat); 137 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 138 139 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 140 141 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 142 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 143 144 #ifdef CONFIG_NUMA 145 /* 146 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 147 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 148 * Because, pgdat for the new node is not allocated/initialized yet itself. 149 * To use new node's memory, more consideration will be necessary. 150 */ 151 #define generic_alloc_nodedata(nid) \ 152 ({ \ 153 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 154 }) 155 /* 156 * This definition is just for error path in node hotadd. 157 * For node hotremove, we have to replace this. 158 */ 159 #define generic_free_nodedata(pgdat) kfree(pgdat) 160 161 extern pg_data_t *node_data[]; 162 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 163 { 164 node_data[nid] = pgdat; 165 } 166 167 #else /* !CONFIG_NUMA */ 168 169 /* never called */ 170 static inline pg_data_t *generic_alloc_nodedata(int nid) 171 { 172 BUG(); 173 return NULL; 174 } 175 static inline void generic_free_nodedata(pg_data_t *pgdat) 176 { 177 } 178 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 179 { 180 } 181 #endif /* CONFIG_NUMA */ 182 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 183 184 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 185 extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 186 #else 187 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 188 { 189 } 190 #endif 191 extern void put_page_bootmem(struct page *page); 192 extern void get_page_bootmem(unsigned long ingo, struct page *page, 193 unsigned long type); 194 195 void get_online_mems(void); 196 void put_online_mems(void); 197 198 void mem_hotplug_begin(void); 199 void mem_hotplug_done(void); 200 201 extern void set_zone_contiguous(struct zone *zone); 202 extern void clear_zone_contiguous(struct zone *zone); 203 204 #else /* ! CONFIG_MEMORY_HOTPLUG */ 205 /* 206 * Stub functions for when hotplug is off 207 */ 208 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 209 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 210 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 211 212 static inline unsigned zone_span_seqbegin(struct zone *zone) 213 { 214 return 0; 215 } 216 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 217 { 218 return 0; 219 } 220 static inline void zone_span_writelock(struct zone *zone) {} 221 static inline void zone_span_writeunlock(struct zone *zone) {} 222 static inline void zone_seqlock_init(struct zone *zone) {} 223 224 static inline int mhp_notimplemented(const char *func) 225 { 226 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 227 dump_stack(); 228 return -ENOSYS; 229 } 230 231 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 232 { 233 } 234 235 static inline int try_online_node(int nid) 236 { 237 return 0; 238 } 239 240 static inline void get_online_mems(void) {} 241 static inline void put_online_mems(void) {} 242 243 static inline void mem_hotplug_begin(void) {} 244 static inline void mem_hotplug_done(void) {} 245 246 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 247 248 #ifdef CONFIG_MEMORY_HOTREMOVE 249 250 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 251 extern void try_offline_node(int nid); 252 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 253 extern void remove_memory(int nid, u64 start, u64 size); 254 255 #else 256 static inline int is_mem_section_removable(unsigned long pfn, 257 unsigned long nr_pages) 258 { 259 return 0; 260 } 261 262 static inline void try_offline_node(int nid) {} 263 264 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 265 { 266 return -EINVAL; 267 } 268 269 static inline void remove_memory(int nid, u64 start, u64 size) {} 270 #endif /* CONFIG_MEMORY_HOTREMOVE */ 271 272 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 273 void *arg, int (*func)(struct memory_block *, void *)); 274 extern int add_memory(int nid, u64 start, u64 size); 275 extern int add_memory_resource(int nid, struct resource *resource, bool online); 276 extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default, 277 bool for_device); 278 extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device); 279 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 280 extern bool is_memblock_offlined(struct memory_block *mem); 281 extern void remove_memory(int nid, u64 start, u64 size); 282 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn); 283 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms, 284 unsigned long map_offset); 285 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 286 unsigned long pnum); 287 288 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 289