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 14 #ifdef CONFIG_MEMORY_HOTPLUG 15 16 /* 17 * Types for free bootmem stored in page->lru.next. These have to be in 18 * some random range in unsigned long space for debugging purposes. 19 */ 20 enum { 21 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 22 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 23 MIX_SECTION_INFO, 24 NODE_INFO, 25 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 26 }; 27 28 /* 29 * pgdat resizing functions 30 */ 31 static inline 32 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 33 { 34 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 35 } 36 static inline 37 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 38 { 39 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 40 } 41 static inline 42 void pgdat_resize_init(struct pglist_data *pgdat) 43 { 44 spin_lock_init(&pgdat->node_size_lock); 45 } 46 /* 47 * Zone resizing functions 48 */ 49 static inline unsigned zone_span_seqbegin(struct zone *zone) 50 { 51 return read_seqbegin(&zone->span_seqlock); 52 } 53 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 54 { 55 return read_seqretry(&zone->span_seqlock, iv); 56 } 57 static inline void zone_span_writelock(struct zone *zone) 58 { 59 write_seqlock(&zone->span_seqlock); 60 } 61 static inline void zone_span_writeunlock(struct zone *zone) 62 { 63 write_sequnlock(&zone->span_seqlock); 64 } 65 static inline void zone_seqlock_init(struct zone *zone) 66 { 67 seqlock_init(&zone->span_seqlock); 68 } 69 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 70 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 71 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 72 /* VM interface that may be used by firmware interface */ 73 extern int online_pages(unsigned long, unsigned long); 74 extern void __offline_isolated_pages(unsigned long, unsigned long); 75 76 typedef void (*online_page_callback_t)(struct page *page); 77 78 extern int set_online_page_callback(online_page_callback_t callback); 79 extern int restore_online_page_callback(online_page_callback_t callback); 80 81 extern void __online_page_set_limits(struct page *page); 82 extern void __online_page_increment_counters(struct page *page); 83 extern void __online_page_free(struct page *page); 84 85 #ifdef CONFIG_MEMORY_HOTREMOVE 86 extern bool is_pageblock_removable_nolock(struct page *page); 87 #endif /* CONFIG_MEMORY_HOTREMOVE */ 88 89 /* reasonably generic interface to expand the physical pages in a zone */ 90 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 91 unsigned long nr_pages); 92 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 93 unsigned long nr_pages); 94 95 #ifdef CONFIG_NUMA 96 extern int memory_add_physaddr_to_nid(u64 start); 97 #else 98 static inline int memory_add_physaddr_to_nid(u64 start) 99 { 100 return 0; 101 } 102 #endif 103 104 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 105 /* 106 * For supporting node-hotadd, we have to allocate a new pgdat. 107 * 108 * If an arch has generic style NODE_DATA(), 109 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 110 * 111 * In general, generic_alloc_nodedata() is used. 112 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 113 * 114 */ 115 extern pg_data_t *arch_alloc_nodedata(int nid); 116 extern void arch_free_nodedata(pg_data_t *pgdat); 117 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 118 119 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 120 121 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 122 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 123 124 #ifdef CONFIG_NUMA 125 /* 126 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 127 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 128 * Because, pgdat for the new node is not allocated/initialized yet itself. 129 * To use new node's memory, more consideration will be necessary. 130 */ 131 #define generic_alloc_nodedata(nid) \ 132 ({ \ 133 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 134 }) 135 /* 136 * This definition is just for error path in node hotadd. 137 * For node hotremove, we have to replace this. 138 */ 139 #define generic_free_nodedata(pgdat) kfree(pgdat) 140 141 extern pg_data_t *node_data[]; 142 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 143 { 144 node_data[nid] = pgdat; 145 } 146 147 #else /* !CONFIG_NUMA */ 148 149 /* never called */ 150 static inline pg_data_t *generic_alloc_nodedata(int nid) 151 { 152 BUG(); 153 return NULL; 154 } 155 static inline void generic_free_nodedata(pg_data_t *pgdat) 156 { 157 } 158 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 159 { 160 } 161 #endif /* CONFIG_NUMA */ 162 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 163 164 #ifdef CONFIG_SPARSEMEM_VMEMMAP 165 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 166 { 167 } 168 static inline void put_page_bootmem(struct page *page) 169 { 170 } 171 #else 172 extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 173 extern void put_page_bootmem(struct page *page); 174 #endif 175 176 /* 177 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug 178 * notifier will be called under this. 2) offline/online/add/remove memory 179 * will not run simultaneously. 180 */ 181 182 void lock_memory_hotplug(void); 183 void unlock_memory_hotplug(void); 184 185 #else /* ! CONFIG_MEMORY_HOTPLUG */ 186 /* 187 * Stub functions for when hotplug is off 188 */ 189 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 190 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 191 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 192 193 static inline unsigned zone_span_seqbegin(struct zone *zone) 194 { 195 return 0; 196 } 197 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 198 { 199 return 0; 200 } 201 static inline void zone_span_writelock(struct zone *zone) {} 202 static inline void zone_span_writeunlock(struct zone *zone) {} 203 static inline void zone_seqlock_init(struct zone *zone) {} 204 205 static inline int mhp_notimplemented(const char *func) 206 { 207 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 208 dump_stack(); 209 return -ENOSYS; 210 } 211 212 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 213 { 214 } 215 216 static inline void lock_memory_hotplug(void) {} 217 static inline void unlock_memory_hotplug(void) {} 218 219 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 220 221 #ifdef CONFIG_MEMORY_HOTREMOVE 222 223 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 224 225 #else 226 static inline int is_mem_section_removable(unsigned long pfn, 227 unsigned long nr_pages) 228 { 229 return 0; 230 } 231 #endif /* CONFIG_MEMORY_HOTREMOVE */ 232 233 extern int mem_online_node(int nid); 234 extern int add_memory(int nid, u64 start, u64 size); 235 extern int arch_add_memory(int nid, u64 start, u64 size); 236 extern int remove_memory(u64 start, u64 size); 237 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, 238 int nr_pages); 239 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 240 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 241 unsigned long pnum); 242 243 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 244