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 12 #ifdef CONFIG_MEMORY_HOTPLUG 13 /* 14 * pgdat resizing functions 15 */ 16 static inline 17 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 18 { 19 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 20 } 21 static inline 22 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 23 { 24 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 25 } 26 static inline 27 void pgdat_resize_init(struct pglist_data *pgdat) 28 { 29 spin_lock_init(&pgdat->node_size_lock); 30 } 31 /* 32 * Zone resizing functions 33 */ 34 static inline unsigned zone_span_seqbegin(struct zone *zone) 35 { 36 return read_seqbegin(&zone->span_seqlock); 37 } 38 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 39 { 40 return read_seqretry(&zone->span_seqlock, iv); 41 } 42 static inline void zone_span_writelock(struct zone *zone) 43 { 44 write_seqlock(&zone->span_seqlock); 45 } 46 static inline void zone_span_writeunlock(struct zone *zone) 47 { 48 write_sequnlock(&zone->span_seqlock); 49 } 50 static inline void zone_seqlock_init(struct zone *zone) 51 { 52 seqlock_init(&zone->span_seqlock); 53 } 54 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 55 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 56 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 57 /* need some defines for these for archs that don't support it */ 58 extern void online_page(struct page *page); 59 /* VM interface that may be used by firmware interface */ 60 extern int online_pages(unsigned long, unsigned long); 61 extern void __offline_isolated_pages(unsigned long, unsigned long); 62 extern int offline_pages(unsigned long, unsigned long, unsigned long); 63 64 /* reasonably generic interface to expand the physical pages in a zone */ 65 extern int __add_pages(struct zone *zone, unsigned long start_pfn, 66 unsigned long nr_pages); 67 68 /* 69 * Walk thorugh all memory which is registered as resource. 70 * arg is (start_pfn, nr_pages, private_arg_pointer) 71 */ 72 extern int walk_memory_resource(unsigned long start_pfn, 73 unsigned long nr_pages, void *arg, 74 int (*func)(unsigned long, unsigned long, void *)); 75 76 #ifdef CONFIG_NUMA 77 extern int memory_add_physaddr_to_nid(u64 start); 78 #else 79 static inline int memory_add_physaddr_to_nid(u64 start) 80 { 81 return 0; 82 } 83 #endif 84 85 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 86 /* 87 * For supporting node-hotadd, we have to allocate a new pgdat. 88 * 89 * If an arch has generic style NODE_DATA(), 90 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 91 * 92 * In general, generic_alloc_nodedata() is used. 93 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 94 * 95 */ 96 extern pg_data_t *arch_alloc_nodedata(int nid); 97 extern void arch_free_nodedata(pg_data_t *pgdat); 98 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 99 100 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 101 102 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 103 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 104 105 #ifdef CONFIG_NUMA 106 /* 107 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 108 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 109 * Because, pgdat for the new node is not allocated/initialized yet itself. 110 * To use new node's memory, more consideration will be necessary. 111 */ 112 #define generic_alloc_nodedata(nid) \ 113 ({ \ 114 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 115 }) 116 /* 117 * This definition is just for error path in node hotadd. 118 * For node hotremove, we have to replace this. 119 */ 120 #define generic_free_nodedata(pgdat) kfree(pgdat) 121 122 extern pg_data_t *node_data[]; 123 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 124 { 125 node_data[nid] = pgdat; 126 } 127 128 #else /* !CONFIG_NUMA */ 129 130 /* never called */ 131 static inline pg_data_t *generic_alloc_nodedata(int nid) 132 { 133 BUG(); 134 return NULL; 135 } 136 static inline void generic_free_nodedata(pg_data_t *pgdat) 137 { 138 } 139 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 140 { 141 } 142 #endif /* CONFIG_NUMA */ 143 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 144 145 #else /* ! CONFIG_MEMORY_HOTPLUG */ 146 /* 147 * Stub functions for when hotplug is off 148 */ 149 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 150 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 151 static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 152 153 static inline unsigned zone_span_seqbegin(struct zone *zone) 154 { 155 return 0; 156 } 157 static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 158 { 159 return 0; 160 } 161 static inline void zone_span_writelock(struct zone *zone) {} 162 static inline void zone_span_writeunlock(struct zone *zone) {} 163 static inline void zone_seqlock_init(struct zone *zone) {} 164 165 static inline int mhp_notimplemented(const char *func) 166 { 167 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 168 dump_stack(); 169 return -ENOSYS; 170 } 171 172 #endif /* ! CONFIG_MEMORY_HOTPLUG */ 173 174 extern int add_memory(int nid, u64 start, u64 size); 175 extern int arch_add_memory(int nid, u64 start, u64 size); 176 extern int remove_memory(u64 start, u64 size); 177 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, 178 int nr_pages); 179 180 #endif /* __LINUX_MEMORY_HOTPLUG_H */ 181