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 8 struct page; 9 struct zone; 10 struct pglist_data; 11 struct mem_section; 12 13 #ifdef CONFIG_MEMORY_HOTPLUG 14 15 /* 16 * Types for free bootmem stored in page->lru.next. These have to be in 17 * some random range in unsigned long space for debugging purposes. 18 */ 19 enum { 20 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 21 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 22 MIX_SECTION_INFO, 23 NODE_INFO, 24 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 25 }; 26 27 /* 28 * pgdat resizing functions 29 */ 30 static inline 31 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 32 { 33 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 34 } 35 static inline 36 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 37 { 38 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 39 } 40 static inline 41 void pgdat_resize_init(struct pglist_data *pgdat) 42 { 43 spin_lock_init(&pgdat->node_size_lock); 44 } 45 /* 46 * Zone resizing functions 47 */ 48 static inline unsigned zone_span_seqbegin(struct zone *zone) 49 { 50 return read_seqbegin(&zone->span_seqlock); 51 } 52 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 53 { 54 return read_seqretry(&zone->span_seqlock, iv); 55 } 56 static inline void zone_span_writelock(struct zone *zone) 57 { 58 write_seqlock(&zone->span_seqlock); 59 } 60 static inline void zone_span_writeunlock(struct zone *zone) 61 { 62 write_sequnlock(&zone->span_seqlock); 63 } 64 static inline void zone_seqlock_init(struct zone *zone) 65 { 66 seqlock_init(&zone->span_seqlock); 67 } 68 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 69 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 70 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 71 /* need some defines for these for archs that don't support it */ 72 extern void online_page(struct page *page); 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 #ifdef CONFIG_MEMORY_HOTREMOVE 78 extern bool is_pageblock_removable_nolock(struct page *page); 79 #endif /* CONFIG_MEMORY_HOTREMOVE */ 80 81 /* reasonably generic interface to expand the physical pages in a zone */ 82 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 83 unsigned long nr_pages); 84 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 85 unsigned long nr_pages); 86 87 #ifdef CONFIG_NUMA 88 extern int memory_add_physaddr_to_nid(u64 start); 89 #else 90 static inline int memory_add_physaddr_to_nid(u64 start) 91 { 92 return 0; 93 } 94 #endif 95 96 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 97 /* 98 * For supporting node-hotadd, we have to allocate a new pgdat. 99 * 100 * If an arch has generic style NODE_DATA(), 101 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 102 * 103 * In general, generic_alloc_nodedata() is used. 104 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 105 * 106 */ 107 extern pg_data_t *arch_alloc_nodedata(int nid); 108 extern void arch_free_nodedata(pg_data_t *pgdat); 109 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 110 111 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 112 113 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 114 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 115 116 #ifdef CONFIG_NUMA 117 /* 118 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 119 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 120 * Because, pgdat for the new node is not allocated/initialized yet itself. 121 * To use new node's memory, more consideration will be necessary. 122 */ 123 #define generic_alloc_nodedata(nid) \ 124 ({ \ 125 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 126 }) 127 /* 128 * This definition is just for error path in node hotadd. 129 * For node hotremove, we have to replace this. 130 */ 131 #define generic_free_nodedata(pgdat) kfree(pgdat) 132 133 extern pg_data_t *node_data[]; 134 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 135 { 136 node_data[nid] = pgdat; 137 } 138 139 #else /* !CONFIG_NUMA */ 140 141 /* never called */ 142 static inline pg_data_t *generic_alloc_nodedata(int nid) 143 { 144 BUG(); 145 return NULL; 146 } 147 static inline void generic_free_nodedata(pg_data_t *pgdat) 148 { 149 } 150 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 151 { 152 } 153 #endif /* CONFIG_NUMA */ 154 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 155 156 #ifdef CONFIG_SPARSEMEM_VMEMMAP 157 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 158 { 159 } 160 static inline void put_page_bootmem(struct page *page) 161 { 162 } 163 #else 164 extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 165 extern void put_page_bootmem(struct page *page); 166 #endif 167 168 /* 169 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug 170 * notifier will be called under this. 2) offline/online/add/remove memory 171 * will not run simultaneously. 172 */ 173 174 void lock_memory_hotplug(void); 175 void unlock_memory_hotplug(void); 176 177 #else /* ! CONFIG_MEMORY_HOTPLUG */ 178 /* 179 * Stub functions for when hotplug is off 180 */ 181 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 182 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 183 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 184 185 static inline unsigned zone_span_seqbegin(struct zone *zone) 186 { 187 return 0; 188 } 189 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 190 { 191 return 0; 192 } 193 static inline void zone_span_writelock(struct zone *zone) {} 194 static inline void zone_span_writeunlock(struct zone *zone) {} 195 static inline void zone_seqlock_init(struct zone *zone) {} 196 197 static inline int mhp_notimplemented(const char *func) 198 { 199 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 200 dump_stack(); 201 return -ENOSYS; 202 } 203 204 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 205 { 206 } 207 208 static inline void lock_memory_hotplug(void) {} 209 static inline void unlock_memory_hotplug(void) {} 210 211 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 212 213 #ifdef CONFIG_MEMORY_HOTREMOVE 214 215 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 216 217 #else 218 static inline int is_mem_section_removable(unsigned long pfn, 219 unsigned long nr_pages) 220 { 221 return 0; 222 } 223 #endif /* CONFIG_MEMORY_HOTREMOVE */ 224 225 extern int mem_online_node(int nid); 226 extern int add_memory(int nid, u64 start, u64 size); 227 extern int arch_add_memory(int nid, u64 start, u64 size); 228 extern int remove_memory(u64 start, u64 size); 229 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, 230 int nr_pages); 231 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 232 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 233 unsigned long pnum); 234 235 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 236