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; 13struct memory_block; 14 15#ifdef CONFIG_MEMORY_HOTPLUG 16 17/* 18 * Types for free bootmem stored in page->lru.next. These have to be in 19 * some random range in unsigned long space for debugging purposes. 20 */ 21enum { 22 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, 23 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, 24 MIX_SECTION_INFO, 25 NODE_INFO, 26 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, 27}; 28 29/* Types for control the zone type of onlined and offlined memory */ 30enum { 31 MMOP_OFFLINE = -1, 32 MMOP_ONLINE_KEEP, 33 MMOP_ONLINE_KERNEL, 34 MMOP_ONLINE_MOVABLE, 35}; 36 37/* 38 * pgdat resizing functions 39 */ 40static inline 41void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) 42{ 43 spin_lock_irqsave(&pgdat->node_size_lock, *flags); 44} 45static inline 46void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) 47{ 48 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); 49} 50static inline 51void pgdat_resize_init(struct pglist_data *pgdat) 52{ 53 spin_lock_init(&pgdat->node_size_lock); 54} 55/* 56 * Zone resizing functions 57 * 58 * Note: any attempt to resize a zone should has pgdat_resize_lock() 59 * zone_span_writelock() both held. This ensure the size of a zone 60 * can't be changed while pgdat_resize_lock() held. 61 */ 62static inline unsigned zone_span_seqbegin(struct zone *zone) 63{ 64 return read_seqbegin(&zone->span_seqlock); 65} 66static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 67{ 68 return read_seqretry(&zone->span_seqlock, iv); 69} 70static inline void zone_span_writelock(struct zone *zone) 71{ 72 write_seqlock(&zone->span_seqlock); 73} 74static inline void zone_span_writeunlock(struct zone *zone) 75{ 76 write_sequnlock(&zone->span_seqlock); 77} 78static inline void zone_seqlock_init(struct zone *zone) 79{ 80 seqlock_init(&zone->span_seqlock); 81} 82extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); 83extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); 84extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); 85/* VM interface that may be used by firmware interface */ 86extern int online_pages(unsigned long, unsigned long, int); 87extern int test_pages_in_a_zone(unsigned long, unsigned long); 88extern void __offline_isolated_pages(unsigned long, unsigned long); 89 90typedef void (*online_page_callback_t)(struct page *page); 91 92extern int set_online_page_callback(online_page_callback_t callback); 93extern int restore_online_page_callback(online_page_callback_t callback); 94 95extern void __online_page_set_limits(struct page *page); 96extern void __online_page_increment_counters(struct page *page); 97extern void __online_page_free(struct page *page); 98 99extern int try_online_node(int nid); 100 101#ifdef CONFIG_MEMORY_HOTREMOVE 102extern bool is_pageblock_removable_nolock(struct page *page); 103extern int arch_remove_memory(u64 start, u64 size); 104extern int __remove_pages(struct zone *zone, unsigned long start_pfn, 105 unsigned long nr_pages); 106#endif /* CONFIG_MEMORY_HOTREMOVE */ 107 108/* reasonably generic interface to expand the physical pages in a zone */ 109extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, 110 unsigned long nr_pages); 111 112#ifdef CONFIG_NUMA 113extern int memory_add_physaddr_to_nid(u64 start); 114#else 115static inline int memory_add_physaddr_to_nid(u64 start) 116{ 117 return 0; 118} 119#endif 120 121#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 122/* 123 * For supporting node-hotadd, we have to allocate a new pgdat. 124 * 125 * If an arch has generic style NODE_DATA(), 126 * node_data[nid] = kzalloc() works well. But it depends on the architecture. 127 * 128 * In general, generic_alloc_nodedata() is used. 129 * Now, arch_free_nodedata() is just defined for error path of node_hot_add. 130 * 131 */ 132extern pg_data_t *arch_alloc_nodedata(int nid); 133extern void arch_free_nodedata(pg_data_t *pgdat); 134extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); 135 136#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 137 138#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) 139#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) 140 141#ifdef CONFIG_NUMA 142/* 143 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. 144 * XXX: kmalloc_node() can't work well to get new node's memory at this time. 145 * Because, pgdat for the new node is not allocated/initialized yet itself. 146 * To use new node's memory, more consideration will be necessary. 147 */ 148#define generic_alloc_nodedata(nid) \ 149({ \ 150 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ 151}) 152/* 153 * This definition is just for error path in node hotadd. 154 * For node hotremove, we have to replace this. 155 */ 156#define generic_free_nodedata(pgdat) kfree(pgdat) 157 158extern pg_data_t *node_data[]; 159static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 160{ 161 node_data[nid] = pgdat; 162} 163 164#else /* !CONFIG_NUMA */ 165 166/* never called */ 167static inline pg_data_t *generic_alloc_nodedata(int nid) 168{ 169 BUG(); 170 return NULL; 171} 172static inline void generic_free_nodedata(pg_data_t *pgdat) 173{ 174} 175static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) 176{ 177} 178#endif /* CONFIG_NUMA */ 179#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ 180 181#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 182extern void register_page_bootmem_info_node(struct pglist_data *pgdat); 183#else 184static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 185{ 186} 187#endif 188extern void put_page_bootmem(struct page *page); 189extern void get_page_bootmem(unsigned long ingo, struct page *page, 190 unsigned long type); 191 192void get_online_mems(void); 193void put_online_mems(void); 194 195void mem_hotplug_begin(void); 196void mem_hotplug_done(void); 197 198#else /* ! CONFIG_MEMORY_HOTPLUG */ 199/* 200 * Stub functions for when hotplug is off 201 */ 202static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} 203static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} 204static inline void pgdat_resize_init(struct pglist_data *pgdat) {} 205 206static inline unsigned zone_span_seqbegin(struct zone *zone) 207{ 208 return 0; 209} 210static inline int zone_span_seqretry(struct zone *zone, unsigned iv) 211{ 212 return 0; 213} 214static inline void zone_span_writelock(struct zone *zone) {} 215static inline void zone_span_writeunlock(struct zone *zone) {} 216static inline void zone_seqlock_init(struct zone *zone) {} 217 218static inline int mhp_notimplemented(const char *func) 219{ 220 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); 221 dump_stack(); 222 return -ENOSYS; 223} 224 225static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) 226{ 227} 228 229static inline int try_online_node(int nid) 230{ 231 return 0; 232} 233 234static inline void get_online_mems(void) {} 235static inline void put_online_mems(void) {} 236 237static inline void mem_hotplug_begin(void) {} 238static inline void mem_hotplug_done(void) {} 239 240#endif /* ! CONFIG_MEMORY_HOTPLUG */ 241 242#ifdef CONFIG_MEMORY_HOTREMOVE 243 244extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); 245extern void try_offline_node(int nid); 246extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 247extern void remove_memory(int nid, u64 start, u64 size); 248 249#else 250static inline int is_mem_section_removable(unsigned long pfn, 251 unsigned long nr_pages) 252{ 253 return 0; 254} 255 256static inline void try_offline_node(int nid) {} 257 258static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 259{ 260 return -EINVAL; 261} 262 263static inline void remove_memory(int nid, u64 start, u64 size) {} 264#endif /* CONFIG_MEMORY_HOTREMOVE */ 265 266extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 267 void *arg, int (*func)(struct memory_block *, void *)); 268extern int add_memory(int nid, u64 start, u64 size); 269extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default); 270extern int arch_add_memory(int nid, u64 start, u64 size); 271extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); 272extern bool is_memblock_offlined(struct memory_block *mem); 273extern void remove_memory(int nid, u64 start, u64 size); 274extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn); 275extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); 276extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, 277 unsigned long pnum); 278 279#endif /* __LINUX_MEMORY_HOTPLUG_H */ 280