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. 17 * The normal smallest mapcount is -1. Here is smaller value than it. 18 */ 19 #define SECTION_INFO (-1 - 1) 20 #define MIX_SECTION_INFO (-1 - 2) 21 #define NODE_INFO (-1 - 3) 22 23 /* 24 * pgdat resizing functions 25 */ 26 static inline 27 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 28 { 29 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 30 } 31 static inline 32 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 33 { 34 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 35 } 36 static inline 37 void pgdat_resize_init(struct pglist_data *pgdat) 38 { 39 spin_lock_init(&pgdat->node_size_lock); 40 } 41 /* 42 * Zone resizing functions 43 */ 44 static inline unsigned zone_span_seqbegin(struct zone *zone) 45 { 46 return read_seqbegin(&zone->span_seqlock); 47 } 48 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 49 { 50 return read_seqretry(&zone->span_seqlock, iv); 51 } 52 static inline void zone_span_writelock(struct zone *zone) 53 { 54 write_seqlock(&zone->span_seqlock); 55 } 56 static inline void zone_span_writeunlock(struct zone *zone) 57 { 58 write_sequnlock(&zone->span_seqlock); 59 } 60 static inline void zone_seqlock_init(struct zone *zone) 61 { 62 seqlock_init(&zone->span_seqlock); 63 } 64 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 65 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 66 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 67 /* need some defines for these for archs that don't support it */ 68 extern void online_page(struct page *page); 69 /* VM interface that may be used by firmware interface */ 70 extern int online_pages(unsigned long, unsigned long); 71 extern void __offline_isolated_pages(unsigned long, unsigned long); 72 73 /* reasonably generic interface to expand the physical pages in a zone */ 74 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 75 unsigned long nr_pages); 76 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 77 unsigned long nr_pages); 78 79 #ifdef CONFIG_NUMA 80 extern int memory_add_physaddr_to_nid(u64 start); 81 #else 82 static inline int memory_add_physaddr_to_nid(u64 start) 83 { 84 return 0; 85 } 86 #endif 87 88 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 89 /* 90 * For supporting node-hotadd, we have to allocate a new pgdat. 91 * 92 * If an arch has generic style NODE_DATA(), 93 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 94 * 95 * In general, generic_alloc_nodedata() is used. 96 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 97 * 98 */ 99 extern pg_data_t *arch_alloc_nodedata(int nid); 100 extern void arch_free_nodedata(pg_data_t *pgdat); 101 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 102 103 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 104 105 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 106 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 107 108 #ifdef CONFIG_NUMA 109 /* 110 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 111 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 112 * Because, pgdat for the new node is not allocated/initialized yet itself. 113 * To use new node's memory, more consideration will be necessary. 114 */ 115 #define generic_alloc_nodedata(nid) \ 116 ({ \ 117 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 118 }) 119 /* 120 * This definition is just for error path in node hotadd. 121 * For node hotremove, we have to replace this. 122 */ 123 #define generic_free_nodedata(pgdat) kfree(pgdat) 124 125 extern pg_data_t *node_data[]; 126 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 127 { 128 node_data[nid] = pgdat; 129 } 130 131 #else /* !CONFIG_NUMA */ 132 133 /* never called */ 134 static inline pg_data_t *generic_alloc_nodedata(int nid) 135 { 136 BUG(); 137 return NULL; 138 } 139 static inline void generic_free_nodedata(pg_data_t *pgdat) 140 { 141 } 142 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 143 { 144 } 145 #endif /* CONFIG_NUMA */ 146 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 147 148 #ifdef CONFIG_SPARSEMEM_VMEMMAP 149 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 150 { 151 } 152 static inline void put_page_bootmem(struct page *page) 153 { 154 } 155 #else 156 extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 157 extern void put_page_bootmem(struct page *page); 158 #endif 159 160 #else /* ! CONFIG_MEMORY_HOTPLUG */ 161 /* 162 * Stub functions for when hotplug is off 163 */ 164 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 165 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 166 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 167 168 static inline unsigned zone_span_seqbegin(struct zone *zone) 169 { 170 return 0; 171 } 172 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 173 { 174 return 0; 175 } 176 static inline void zone_span_writelock(struct zone *zone) {} 177 static inline void zone_span_writeunlock(struct zone *zone) {} 178 static inline void zone_seqlock_init(struct zone *zone) {} 179 180 static inline int mhp_notimplemented(const char *func) 181 { 182 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 183 dump_stack(); 184 return -ENOSYS; 185 } 186 187 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 188 { 189 } 190 191 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 192 193 #ifdef CONFIG_MEMORY_HOTREMOVE 194 195 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 196 197 #else 198 static inline int is_mem_section_removable(unsigned long pfn, 199 unsigned long nr_pages) 200 { 201 return 0; 202 } 203 #endif /* CONFIG_MEMORY_HOTREMOVE */ 204 205 extern int mem_online_node(int nid); 206 extern int add_memory(int nid, u64 start, u64 size); 207 extern int arch_add_memory(int nid, u64 start, u64 size); 208 extern int remove_memory(u64 start, u64 size); 209 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, 210 int nr_pages); 211 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 212 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 213 unsigned long pnum); 214 215 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 216