#ifndef __LINUX_MEMORY_HOTPLUG_H #define __LINUX_MEMORY_HOTPLUG_H #include <linux/mmzone.h> #include <linux/spinlock.h> #include <linux/notifier.h> struct page; struct zone; struct pglist_data; struct mem_section; #ifdef CONFIG_MEMORY_HOTPLUG /* * Magic number for free bootmem. * The normal smallest mapcount is -1. Here is smaller value than it. */ #define SECTION_INFO 0xfffffffe #define MIX_INFO 0xfffffffd #define NODE_INFO 0xfffffffc /* * pgdat resizing functions */ static inline void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) { spin_lock_irqsave(&pgdat->node_size_lock, *flags); } static inline void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) { spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); } static inline void pgdat_resize_init(struct pglist_data *pgdat) { spin_lock_init(&pgdat->node_size_lock); } /* * Zone resizing functions */ static inline unsigned zone_span_seqbegin(struct zone *zone) { return read_seqbegin(&zone->span_seqlock); } static inline int zone_span_seqretry(struct zone *zone, unsigned iv) { return read_seqretry(&zone->span_seqlock, iv); } static inline void zone_span_writelock(struct zone *zone) { write_seqlock(&zone->span_seqlock); } static inline void zone_span_writeunlock(struct zone *zone) { write_sequnlock(&zone->span_seqlock); } static inline void zone_seqlock_init(struct zone *zone) { seqlock_init(&zone->span_seqlock); } extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); /* need some defines for these for archs that don't support it */ extern void online_page(struct page *page); /* VM interface that may be used by firmware interface */ extern int online_pages(unsigned long, unsigned long); extern void __offline_isolated_pages(unsigned long, unsigned long); extern int offline_pages(unsigned long, unsigned long, unsigned long); /* reasonably generic interface to expand the physical pages in a zone */ extern int __add_pages(struct zone *zone, unsigned long start_pfn, unsigned long nr_pages); extern int __remove_pages(struct zone *zone, unsigned long start_pfn, unsigned long nr_pages); #ifdef CONFIG_NUMA extern int memory_add_physaddr_to_nid(u64 start); #else static inline int memory_add_physaddr_to_nid(u64 start) { return 0; } #endif #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION /* * For supporting node-hotadd, we have to allocate a new pgdat. * * If an arch has generic style NODE_DATA(), * node_data[nid] = kzalloc() works well. But it depends on the architecture. * * In general, generic_alloc_nodedata() is used. * Now, arch_free_nodedata() is just defined for error path of node_hot_add. * */ extern pg_data_t *arch_alloc_nodedata(int nid); extern void arch_free_nodedata(pg_data_t *pgdat); extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) #ifdef CONFIG_NUMA /* * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. * XXX: kmalloc_node() can't work well to get new node's memory at this time. * Because, pgdat for the new node is not allocated/initialized yet itself. * To use new node's memory, more consideration will be necessary. */ #define generic_alloc_nodedata(nid) \ ({ \ kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ }) /* * This definition is just for error path in node hotadd. * For node hotremove, we have to replace this. */ #define generic_free_nodedata(pgdat) kfree(pgdat) extern pg_data_t *node_data[]; static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) { node_data[nid] = pgdat; } #else /* !CONFIG_NUMA */ /* never called */ static inline pg_data_t *generic_alloc_nodedata(int nid) { BUG(); return NULL; } static inline void generic_free_nodedata(pg_data_t *pgdat) { } static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) { } #endif /* CONFIG_NUMA */ #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ #ifdef CONFIG_SPARSEMEM_VMEMMAP static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) { } static inline void put_page_bootmem(struct page *page) { } #else extern void register_page_bootmem_info_node(struct pglist_data *pgdat); extern void put_page_bootmem(struct page *page); #endif #else /* ! CONFIG_MEMORY_HOTPLUG */ /* * Stub functions for when hotplug is off */ static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} static inline void pgdat_resize_init(struct pglist_data *pgdat) {} static inline unsigned zone_span_seqbegin(struct zone *zone) { return 0; } static inline int zone_span_seqretry(struct zone *zone, unsigned iv) { return 0; } static inline void zone_span_writelock(struct zone *zone) {} static inline void zone_span_writeunlock(struct zone *zone) {} static inline void zone_seqlock_init(struct zone *zone) {} static inline int mhp_notimplemented(const char *func) { printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); dump_stack(); return -ENOSYS; } static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) { } #endif /* ! CONFIG_MEMORY_HOTPLUG */ /* * Walk through all memory which is registered as resource. * arg is (start_pfn, nr_pages, private_arg_pointer) */ extern int walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg, int (*func)(unsigned long, unsigned long, void *)); extern int add_memory(int nid, u64 start, u64 size); extern int arch_add_memory(int nid, u64 start, u64 size); extern int remove_memory(u64 start, u64 size); extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, int nr_pages); extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum); #endif /* __LINUX_MEMORY_HOTPLUG_H */