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#include <linux/bug.h> 8 9struct page; 10struct zone; 11struct pglist_data; 12struct mem_section; 13 14#ifdef CONFIG_MEMORY_HOTPLUG 15 16/* 17 * Types for free bootmem stored in page->lru.next. These have to be in 18 * some random range in unsigned long space for debugging purposes. 19 */ 20enum { 21 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 22 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 23 MIX_SECTION_INFO, 24 NODE_INFO, 25 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 26}; 27 28/* 29 * pgdat resizing functions 30 */ 31static inline 32void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 33{ 34 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 35} 36static inline 37void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 38{ 39 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 40} 41static inline 42void pgdat_resize_init(struct pglist_data *pgdat) 43{ 44 spin_lock_init(&pgdat->node_size_lock); 45} 46/* 47 * Zone resizing functions 48 */ 49static inline unsigned zone_span_seqbegin(struct zone *zone) 50{ 51 return read_seqbegin(&zone->span_seqlock); 52} 53static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 54{ 55 return read_seqretry(&zone->span_seqlock, iv); 56} 57static inline void zone_span_writelock(struct zone *zone) 58{ 59 write_seqlock(&zone->span_seqlock); 60} 61static inline void zone_span_writeunlock(struct zone *zone) 62{ 63 write_sequnlock(&zone->span_seqlock); 64} 65static inline void zone_seqlock_init(struct zone *zone) 66{ 67 seqlock_init(&zone->span_seqlock); 68} 69extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 70extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 71extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 72/* VM interface that may be used by firmware interface */ 73extern int online_pages(unsigned long, unsigned long); 74extern void __offline_isolated_pages(unsigned long, unsigned long); 75 76typedef void (*online_page_callback_t)(struct page *page); 77 78extern int set_online_page_callback(online_page_callback_t callback); 79extern int restore_online_page_callback(online_page_callback_t callback); 80 81extern void __online_page_set_limits(struct page *page); 82extern void __online_page_increment_counters(struct page *page); 83extern void __online_page_free(struct page *page); 84 85#ifdef CONFIG_MEMORY_HOTREMOVE 86extern bool is_pageblock_removable_nolock(struct page *page); 87#endif /* CONFIG_MEMORY_HOTREMOVE */ 88 89/* reasonably generic interface to expand the physical pages in a zone */ 90extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 91 unsigned long nr_pages); 92extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 93 unsigned long nr_pages); 94 95#ifdef CONFIG_NUMA 96extern int memory_add_physaddr_to_nid(u64 start); 97#else 98static inline int memory_add_physaddr_to_nid(u64 start) 99{ 100 return 0; 101} 102#endif 103 104#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 105/* 106 * For supporting node-hotadd, we have to allocate a new pgdat. 107 * 108 * If an arch has generic style NODE_DATA(), 109 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 110 * 111 * In general, generic_alloc_nodedata() is used. 112 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 113 * 114 */ 115extern pg_data_t *arch_alloc_nodedata(int nid); 116extern void arch_free_nodedata(pg_data_t *pgdat); 117extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 118 119#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 120 121#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 122#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 123 124#ifdef CONFIG_NUMA 125/* 126 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 127 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 128 * Because, pgdat for the new node is not allocated/initialized yet itself. 129 * To use new node's memory, more consideration will be necessary. 130 */ 131#define generic_alloc_nodedata(nid) \ 132({ \ 133 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 134}) 135/* 136 * This definition is just for error path in node hotadd. 137 * For node hotremove, we have to replace this. 138 */ 139#define generic_free_nodedata(pgdat) kfree(pgdat) 140 141extern pg_data_t *node_data[]; 142static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 143{ 144 node_data[nid] = pgdat; 145} 146 147#else /* !CONFIG_NUMA */ 148 149/* never called */ 150static inline pg_data_t *generic_alloc_nodedata(int nid) 151{ 152 BUG(); 153 return NULL; 154} 155static inline void generic_free_nodedata(pg_data_t *pgdat) 156{ 157} 158static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 159{ 160} 161#endif /* CONFIG_NUMA */ 162#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 163 164#ifdef CONFIG_SPARSEMEM_VMEMMAP 165static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 166{ 167} 168static inline void put_page_bootmem(struct page *page) 169{ 170} 171#else 172extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 173extern void put_page_bootmem(struct page *page); 174#endif 175 176/* 177 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug 178 * notifier will be called under this. 2) offline/online/add/remove memory 179 * will not run simultaneously. 180 */ 181 182void lock_memory_hotplug(void); 183void unlock_memory_hotplug(void); 184 185#else /* ! CONFIG_MEMORY_HOTPLUG */ 186/* 187 * Stub functions for when hotplug is off 188 */ 189static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 190static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 191static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 192 193static inline unsigned zone_span_seqbegin(struct zone *zone) 194{ 195 return 0; 196} 197static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 198{ 199 return 0; 200} 201static inline void zone_span_writelock(struct zone *zone) {} 202static inline void zone_span_writeunlock(struct zone *zone) {} 203static inline void zone_seqlock_init(struct zone *zone) {} 204 205static inline int mhp_notimplemented(const char *func) 206{ 207 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 208 dump_stack(); 209 return -ENOSYS; 210} 211 212static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 213{ 214} 215 216static inline void lock_memory_hotplug(void) {} 217static inline void unlock_memory_hotplug(void) {} 218 219#endif /* ! CONFIG_MEMORY_HOTPLUG */ 220 221#ifdef CONFIG_MEMORY_HOTREMOVE 222 223extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 224 225#else 226static inline int is_mem_section_removable(unsigned long pfn, 227 unsigned long nr_pages) 228{ 229 return 0; 230} 231#endif /* CONFIG_MEMORY_HOTREMOVE */ 232 233extern int mem_online_node(int nid); 234extern int add_memory(int nid, u64 start, u64 size); 235extern int arch_add_memory(int nid, u64 start, u64 size); 236extern int remove_memory(u64 start, u64 size); 237extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, 238 int nr_pages); 239extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 240extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 241 unsigned long pnum); 242 243#endif /* __LINUX_MEMORY_HOTPLUG_H */ 244