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 start_pfn, unsigned long end_pfn, 89 unsigned long *valid_start, unsigned long *valid_end); 90 extern void __offline_isolated_pages(unsigned long, unsigned long); 91 92 typedef void (*online_page_callback_t)(struct page *page); 93 94 extern int set_online_page_callback(online_page_callback_t callback); 95 extern int restore_online_page_callback(online_page_callback_t callback); 96 97 extern void __online_page_set_limits(struct page *page); 98 extern void __online_page_increment_counters(struct page *page); 99 extern void __online_page_free(struct page *page); 100 101 extern int try_online_node(int nid); 102 103 extern bool memhp_auto_online; 104 105 #ifdef CONFIG_MEMORY_HOTREMOVE 106 extern bool is_pageblock_removable_nolock(struct page *page); 107 extern int arch_remove_memory(u64 start, u64 size); 108 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 109 unsigned long nr_pages); 110 #endif /* CONFIG_MEMORY_HOTREMOVE */ 111 112 /* reasonably generic interface to expand the physical pages in a zone */ 113 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 114 unsigned long nr_pages); 115 116 #ifdef CONFIG_NUMA 117 extern int memory_add_physaddr_to_nid(u64 start); 118 #else 119 static inline int memory_add_physaddr_to_nid(u64 start) 120 { 121 return 0; 122 } 123 #endif 124 125 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 126 /* 127 * For supporting node-hotadd, we have to allocate a new pgdat. 128 * 129 * If an arch has generic style NODE_DATA(), 130 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 131 * 132 * In general, generic_alloc_nodedata() is used. 133 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 134 * 135 */ 136 extern pg_data_t *arch_alloc_nodedata(int nid); 137 extern void arch_free_nodedata(pg_data_t *pgdat); 138 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 139 140 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 141 142 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 143 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 144 145 #ifdef CONFIG_NUMA 146 /* 147 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 148 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 149 * Because, pgdat for the new node is not allocated/initialized yet itself. 150 * To use new node's memory, more consideration will be necessary. 151 */ 152 #define generic_alloc_nodedata(nid) \ 153 ({ \ 154 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 155 }) 156 /* 157 * This definition is just for error path in node hotadd. 158 * For node hotremove, we have to replace this. 159 */ 160 #define generic_free_nodedata(pgdat) kfree(pgdat) 161 162 extern pg_data_t *node_data[]; 163 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 164 { 165 node_data[nid] = pgdat; 166 } 167 168 #else /* !CONFIG_NUMA */ 169 170 /* never called */ 171 static inline pg_data_t *generic_alloc_nodedata(int nid) 172 { 173 BUG(); 174 return NULL; 175 } 176 static inline void generic_free_nodedata(pg_data_t *pgdat) 177 { 178 } 179 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 180 { 181 } 182 #endif /* CONFIG_NUMA */ 183 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 184 185 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 186 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); 187 #else 188 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 189 { 190 } 191 #endif 192 extern void put_page_bootmem(struct page *page); 193 extern void get_page_bootmem(unsigned long ingo, struct page *page, 194 unsigned long type); 195 196 void get_online_mems(void); 197 void put_online_mems(void); 198 199 void mem_hotplug_begin(void); 200 void mem_hotplug_done(void); 201 202 extern void set_zone_contiguous(struct zone *zone); 203 extern void clear_zone_contiguous(struct zone *zone); 204 205 #else /* ! CONFIG_MEMORY_HOTPLUG */ 206 /* 207 * Stub functions for when hotplug is off 208 */ 209 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 210 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 211 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 212 213 static inline unsigned zone_span_seqbegin(struct zone *zone) 214 { 215 return 0; 216 } 217 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 218 { 219 return 0; 220 } 221 static inline void zone_span_writelock(struct zone *zone) {} 222 static inline void zone_span_writeunlock(struct zone *zone) {} 223 static inline void zone_seqlock_init(struct zone *zone) {} 224 225 static inline int mhp_notimplemented(const char *func) 226 { 227 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 228 dump_stack(); 229 return -ENOSYS; 230 } 231 232 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 233 { 234 } 235 236 static inline int try_online_node(int nid) 237 { 238 return 0; 239 } 240 241 static inline void get_online_mems(void) {} 242 static inline void put_online_mems(void) {} 243 244 static inline void mem_hotplug_begin(void) {} 245 static inline void mem_hotplug_done(void) {} 246 247 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 248 249 #ifdef CONFIG_MEMORY_HOTREMOVE 250 251 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 252 extern void try_offline_node(int nid); 253 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 254 extern void remove_memory(int nid, u64 start, u64 size); 255 256 #else 257 static inline bool is_mem_section_removable(unsigned long pfn, 258 unsigned long nr_pages) 259 { 260 return false; 261 } 262 263 static inline void try_offline_node(int nid) {} 264 265 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 266 { 267 return -EINVAL; 268 } 269 270 static inline void remove_memory(int nid, u64 start, u64 size) {} 271 #endif /* CONFIG_MEMORY_HOTREMOVE */ 272 273 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 274 void *arg, int (*func)(struct memory_block *, void *)); 275 extern int add_memory(int nid, u64 start, u64 size); 276 extern int add_memory_resource(int nid, struct resource *resource, bool online); 277 extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default, 278 bool for_device); 279 extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device); 280 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 281 extern bool is_memblock_offlined(struct memory_block *mem); 282 extern void remove_memory(int nid, u64 start, u64 size); 283 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn); 284 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms, 285 unsigned long map_offset); 286 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 287 unsigned long pnum); 288 extern bool zone_can_shift(unsigned long pfn, unsigned long nr_pages, 289 enum zone_type target, int *zone_shift); 290 291 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 292