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 extern int offline_pages(unsigned long, unsigned long, unsigned long); 73 74 /* reasonably generic interface to expand the physical pages in a zone */ 75 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 76 unsigned long nr_pages); 77 extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 78 unsigned long nr_pages); 79 80 #ifdef CONFIG_NUMA 81 extern int memory_add_physaddr_to_nid(u64 start); 82 #else 83 static inline int memory_add_physaddr_to_nid(u64 start) 84 { 85 return 0; 86 } 87 #endif 88 89 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 90 /* 91 * For supporting node-hotadd, we have to allocate a new pgdat. 92 * 93 * If an arch has generic style NODE_DATA(), 94 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 95 * 96 * In general, generic_alloc_nodedata() is used. 97 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 98 * 99 */ 100 extern pg_data_t *arch_alloc_nodedata(int nid); 101 extern void arch_free_nodedata(pg_data_t *pgdat); 102 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 103 104 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 105 106 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 107 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 108 109 #ifdef CONFIG_NUMA 110 /* 111 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 112 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 113 * Because, pgdat for the new node is not allocated/initialized yet itself. 114 * To use new node's memory, more consideration will be necessary. 115 */ 116 #define generic_alloc_nodedata(nid) \ 117 ({ \ 118 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 119 }) 120 /* 121 * This definition is just for error path in node hotadd. 122 * For node hotremove, we have to replace this. 123 */ 124 #define generic_free_nodedata(pgdat) kfree(pgdat) 125 126 extern pg_data_t *node_data[]; 127 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 128 { 129 node_data[nid] = pgdat; 130 } 131 132 #else /* !CONFIG_NUMA */ 133 134 /* never called */ 135 static inline pg_data_t *generic_alloc_nodedata(int nid) 136 { 137 BUG(); 138 return NULL; 139 } 140 static inline void generic_free_nodedata(pg_data_t *pgdat) 141 { 142 } 143 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 144 { 145 } 146 #endif /* CONFIG_NUMA */ 147 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 148 149 #ifdef CONFIG_SPARSEMEM_VMEMMAP 150 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 151 { 152 } 153 static inline void put_page_bootmem(struct page *page) 154 { 155 } 156 #else 157 extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 158 extern void put_page_bootmem(struct page *page); 159 #endif 160 161 #else /* ! CONFIG_MEMORY_HOTPLUG */ 162 /* 163 * Stub functions for when hotplug is off 164 */ 165 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 166 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 167 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 168 169 static inline unsigned zone_span_seqbegin(struct zone *zone) 170 { 171 return 0; 172 } 173 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 174 { 175 return 0; 176 } 177 static inline void zone_span_writelock(struct zone *zone) {} 178 static inline void zone_span_writeunlock(struct zone *zone) {} 179 static inline void zone_seqlock_init(struct zone *zone) {} 180 181 static inline int mhp_notimplemented(const char *func) 182 { 183 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 184 dump_stack(); 185 return -ENOSYS; 186 } 187 188 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 189 { 190 } 191 192 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 193 194 /* 195 * Walk through all memory which is registered as resource. 196 * arg is (start_pfn, nr_pages, private_arg_pointer) 197 */ 198 extern int walk_memory_resource(unsigned long start_pfn, 199 unsigned long nr_pages, void *arg, 200 int (*func)(unsigned long, unsigned long, void *)); 201 202 #ifdef CONFIG_MEMORY_HOTREMOVE 203 204 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 205 206 #else 207 static inline int is_mem_section_removable(unsigned long pfn, 208 unsigned long nr_pages) 209 { 210 return 0; 211 } 212 #endif /* CONFIG_MEMORY_HOTREMOVE */ 213 214 extern int add_memory(int nid, u64 start, u64 size); 215 extern int arch_add_memory(int nid, u64 start, u64 size); 216 extern int remove_memory(u64 start, u64 size); 217 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, 218 int nr_pages); 219 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 220 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 221 unsigned long pnum); 222 223 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 224