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 /* 30 * pgdat resizing functions 31 */ 32 static inline 33 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 34 { 35 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 36 } 37 static inline 38 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 39 { 40 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 41 } 42 static inline 43 void pgdat_resize_init(struct pglist_data *pgdat) 44 { 45 spin_lock_init(&pgdat->node_size_lock); 46 } 47 /* 48 * Zone resizing functions 49 */ 50 static inline unsigned zone_span_seqbegin(struct zone *zone) 51 { 52 return read_seqbegin(&zone->span_seqlock); 53 } 54 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 55 { 56 return read_seqretry(&zone->span_seqlock, iv); 57 } 58 static inline void zone_span_writelock(struct zone *zone) 59 { 60 write_seqlock(&zone->span_seqlock); 61 } 62 static inline void zone_span_writeunlock(struct zone *zone) 63 { 64 write_sequnlock(&zone->span_seqlock); 65 } 66 static inline void zone_seqlock_init(struct zone *zone) 67 { 68 seqlock_init(&zone->span_seqlock); 69 } 70 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 71 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 72 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 73 /* VM interface that may be used by firmware interface */ 74 extern int online_pages(unsigned long, unsigned long); 75 extern void __offline_isolated_pages(unsigned long, unsigned long); 76 77 typedef void (*online_page_callback_t)(struct page *page); 78 79 extern int set_online_page_callback(online_page_callback_t callback); 80 extern int restore_online_page_callback(online_page_callback_t callback); 81 82 extern void __online_page_set_limits(struct page *page); 83 extern void __online_page_increment_counters(struct page *page); 84 extern void __online_page_free(struct page *page); 85 86 #ifdef CONFIG_MEMORY_HOTREMOVE 87 extern bool is_pageblock_removable_nolock(struct page *page); 88 #endif /* CONFIG_MEMORY_HOTREMOVE */ 89 90 /* reasonably generic interface to expand the physical pages in a zone */ 91 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 92 unsigned long nr_pages); 93 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 94 unsigned long nr_pages); 95 96 #ifdef CONFIG_NUMA 97 extern int memory_add_physaddr_to_nid(u64 start); 98 #else 99 static inline int memory_add_physaddr_to_nid(u64 start) 100 { 101 return 0; 102 } 103 #endif 104 105 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 106 /* 107 * For supporting node-hotadd, we have to allocate a new pgdat. 108 * 109 * If an arch has generic style NODE_DATA(), 110 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 111 * 112 * In general, generic_alloc_nodedata() is used. 113 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 114 * 115 */ 116 extern pg_data_t *arch_alloc_nodedata(int nid); 117 extern void arch_free_nodedata(pg_data_t *pgdat); 118 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 119 120 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 121 122 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 123 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 124 125 #ifdef CONFIG_NUMA 126 /* 127 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 128 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 129 * Because, pgdat for the new node is not allocated/initialized yet itself. 130 * To use new node's memory, more consideration will be necessary. 131 */ 132 #define generic_alloc_nodedata(nid) \ 133 ({ \ 134 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 135 }) 136 /* 137 * This definition is just for error path in node hotadd. 138 * For node hotremove, we have to replace this. 139 */ 140 #define generic_free_nodedata(pgdat) kfree(pgdat) 141 142 extern pg_data_t *node_data[]; 143 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 144 { 145 node_data[nid] = pgdat; 146 } 147 148 #else /* !CONFIG_NUMA */ 149 150 /* never called */ 151 static inline pg_data_t *generic_alloc_nodedata(int nid) 152 { 153 BUG(); 154 return NULL; 155 } 156 static inline void generic_free_nodedata(pg_data_t *pgdat) 157 { 158 } 159 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 160 { 161 } 162 #endif /* CONFIG_NUMA */ 163 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 164 165 #ifdef CONFIG_SPARSEMEM_VMEMMAP 166 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 167 { 168 } 169 static inline void put_page_bootmem(struct page *page) 170 { 171 } 172 #else 173 extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 174 extern void put_page_bootmem(struct page *page); 175 #endif 176 177 /* 178 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug 179 * notifier will be called under this. 2) offline/online/add/remove memory 180 * will not run simultaneously. 181 */ 182 183 void lock_memory_hotplug(void); 184 void unlock_memory_hotplug(void); 185 186 #else /* ! CONFIG_MEMORY_HOTPLUG */ 187 /* 188 * Stub functions for when hotplug is off 189 */ 190 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 191 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 192 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 193 194 static inline unsigned zone_span_seqbegin(struct zone *zone) 195 { 196 return 0; 197 } 198 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 199 { 200 return 0; 201 } 202 static inline void zone_span_writelock(struct zone *zone) {} 203 static inline void zone_span_writeunlock(struct zone *zone) {} 204 static inline void zone_seqlock_init(struct zone *zone) {} 205 206 static inline int mhp_notimplemented(const char *func) 207 { 208 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 209 dump_stack(); 210 return -ENOSYS; 211 } 212 213 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 214 { 215 } 216 217 static inline void lock_memory_hotplug(void) {} 218 static inline void unlock_memory_hotplug(void) {} 219 220 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 221 222 #ifdef CONFIG_MEMORY_HOTREMOVE 223 224 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 225 226 #else 227 static inline int is_mem_section_removable(unsigned long pfn, 228 unsigned long nr_pages) 229 { 230 return 0; 231 } 232 #endif /* CONFIG_MEMORY_HOTREMOVE */ 233 234 extern int mem_online_node(int nid); 235 extern int add_memory(int nid, u64 start, u64 size); 236 extern int arch_add_memory(int nid, u64 start, u64 size); 237 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 238 extern int offline_memory_block(struct memory_block *mem); 239 extern int remove_memory(u64 start, u64 size); 240 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, 241 int nr_pages); 242 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 243 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 244 unsigned long pnum); 245 246 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 247