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 * Magic number for free bootmem. 17 * The normal smallest mapcount is -1. Here is smaller value than it. 18 */ 19 #define SECTION_INFO 0xfffffffe 20 #define MIX_INFO 0xfffffffd 21 #define NODE_INFO 0xfffffffc 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(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 /* 81 * Walk through all memory which is registered as resource. 82 * arg is (start_pfn, nr_pages, private_arg_pointer) 83 */ 84 extern int walk_memory_resource(unsigned long start_pfn, 85 unsigned long nr_pages, void *arg, 86 int (*func)(unsigned long, unsigned long, void *)); 87 88 #ifdef CONFIG_NUMA 89 extern int memory_add_physaddr_to_nid(u64 start); 90 #else 91 static inline int memory_add_physaddr_to_nid(u64 start) 92 { 93 return 0; 94 } 95 #endif 96 97 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 98 /* 99 * For supporting node-hotadd, we have to allocate a new pgdat. 100 * 101 * If an arch has generic style NODE_DATA(), 102 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 103 * 104 * In general, generic_alloc_nodedata() is used. 105 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 106 * 107 */ 108 extern pg_data_t *arch_alloc_nodedata(int nid); 109 extern void arch_free_nodedata(pg_data_t *pgdat); 110 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 111 112 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 113 114 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 115 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 116 117 #ifdef CONFIG_NUMA 118 /* 119 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 120 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 121 * Because, pgdat for the new node is not allocated/initialized yet itself. 122 * To use new node's memory, more consideration will be necessary. 123 */ 124 #define generic_alloc_nodedata(nid) \ 125 ({ \ 126 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 127 }) 128 /* 129 * This definition is just for error path in node hotadd. 130 * For node hotremove, we have to replace this. 131 */ 132 #define generic_free_nodedata(pgdat) kfree(pgdat) 133 134 extern pg_data_t *node_data[]; 135 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 136 { 137 node_data[nid] = pgdat; 138 } 139 140 #else /* !CONFIG_NUMA */ 141 142 /* never called */ 143 static inline pg_data_t *generic_alloc_nodedata(int nid) 144 { 145 BUG(); 146 return NULL; 147 } 148 static inline void generic_free_nodedata(pg_data_t *pgdat) 149 { 150 } 151 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 152 { 153 } 154 #endif /* CONFIG_NUMA */ 155 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 156 157 #ifdef CONFIG_SPARSEMEM_VMEMMAP 158 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 159 { 160 } 161 static inline void put_page_bootmem(struct page *page) 162 { 163 } 164 #else 165 extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 166 extern void put_page_bootmem(struct page *page); 167 #endif 168 169 #else /* ! CONFIG_MEMORY_HOTPLUG */ 170 /* 171 * Stub functions for when hotplug is off 172 */ 173 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 174 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 175 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 176 177 static inline unsigned zone_span_seqbegin(struct zone *zone) 178 { 179 return 0; 180 } 181 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 182 { 183 return 0; 184 } 185 static inline void zone_span_writelock(struct zone *zone) {} 186 static inline void zone_span_writeunlock(struct zone *zone) {} 187 static inline void zone_seqlock_init(struct zone *zone) {} 188 189 static inline int mhp_notimplemented(const char *func) 190 { 191 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 192 dump_stack(); 193 return -ENOSYS; 194 } 195 196 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 197 { 198 } 199 200 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 201 202 extern int add_memory(int nid, u64 start, u64 size); 203 extern int arch_add_memory(int nid, u64 start, u64 size); 204 extern int remove_memory(u64 start, u64 size); 205 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, 206 int nr_pages); 207 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 208 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 209 unsigned long pnum); 210 211 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 212