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/* SPDX-License-Identifier: GPL-2.0 / #ifndef __LINUX_MEMORY_HOTPLUG_H #define __LINUX_MEMORY_HOTPLUG_H #include <linux/mmzone.h> #include <linux/spinlock.h> #include <linux/notifier.h> #include <linux/bug.h> struct page; struct zone; struct pglist_data; struct mem_section; struct memory_block; struct resource; struct vmem_altmap; #ifdef CONFIG_MEMORY_HOTPLUG / * Return page for the valid pfn only if the page is online. All pfn * walkers which rely on the fully initialized page->flags and others * should use this rather than pfn_valid && pfn_to_page / #define pfn_to_online_page(pfn) \ ({ \ struct page ___page = NULL; \ unsigned long ___pfn = pfn; \ unsigned long ___nr = pfn_to_section_nr(___pfn); \ \ if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \ pfn_valid_within(___pfn)) \ ___page = pfn_to_page(___pfn); \ ___page; \ }) /* * Types for free bootmem stored in page->lru.next. These have to be in * some random range in unsigned long space for debugging purposes. / enum { MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, MIX_SECTION_INFO, NODE_INFO, MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, }; / Types for control the zone type of onlined and offlined memory / enum { MMOP_OFFLINE = -1, MMOP_ONLINE_KEEP, MMOP_ONLINE_KERNEL, MMOP_ONLINE_MOVABLE, }; / * Restrictions for the memory hotplug: * flags: MHP_ flags * altmap: alternative allocator for memmap array / struct mhp_restrictions { unsigned long flags; struct vmem_altmap altmap; }; /* * Zone resizing functions * * Note: any attempt to resize a zone should has pgdat_resize_lock() * zone_span_writelock() both held. This ensure the size of a zone * can't be changed while pgdat_resize_lock() held. / 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); / VM interface that may be used by firmware interface / extern int online_pages(unsigned long, unsigned long, int); extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, unsigned long valid_start, unsigned long valid_end); extern unsigned long __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn); typedef void (online_page_callback_t)(struct page page, unsigned int order); extern int set_online_page_callback(online_page_callback_t callback); extern int restore_online_page_callback(online_page_callback_t callback); extern void __online_page_set_limits(struct page page); extern void __online_page_increment_counters(struct page page); extern void __online_page_free(struct page page); extern int try_online_node(int nid); extern int arch_add_memory(int nid, u64 start, u64 size, struct mhp_restrictions restrictions); extern u64 max_mem_size; extern bool memhp_auto_online; / If movable_node boot option specified / extern bool movable_node_enabled; static inline bool movable_node_is_enabled(void) { return movable_node_enabled; } extern void arch_remove_memory(int nid, u64 start, u64 size, struct vmem_altmap altmap); extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages, struct vmem_altmap altmap); / reasonably generic interface to expand the physical pages / extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, struct mhp_restrictions restrictions); #ifndef CONFIG_ARCH_HAS_ADD_PAGES static inline int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, struct mhp_restrictions restrictions) { return __add_pages(nid, start_pfn, nr_pages, restrictions); } #else / ARCH_HAS_ADD_PAGES / int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, struct mhp_restrictions restrictions); #endif /* ARCH_HAS_ADD_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_HAVE_BOOTMEM_INFO_NODE extern void __init register_page_bootmem_info_node(struct pglist_data pgdat); #else static inline void register_page_bootmem_info_node(struct pglist_data pgdat) { } #endif extern void put_page_bootmem(struct page page); extern void get_page_bootmem(unsigned long ingo, struct page page, unsigned long type); void get_online_mems(void); void put_online_mems(void); void mem_hotplug_begin(void); void mem_hotplug_done(void); extern void set_zone_contiguous(struct zone zone); extern void clear_zone_contiguous(struct zone zone); void set_default_mem_hotplug_zone(enum zone_type zone); #else / ! CONFIG_MEMORY_HOTPLUG / #define pfn_to_online_page(pfn) \ ({ \ struct page ___page = NULL; \ if (pfn_valid(pfn)) \ ___page = pfn_to_page(pfn); \ ___page; \ }) 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) { } static inline int try_online_node(int nid) { return 0; } static inline void get_online_mems(void) {} static inline void put_online_mems(void) {} static inline void mem_hotplug_begin(void) {} static inline void mem_hotplug_done(void) {} static inline void set_default_mem_hotplug_zone(enum zone_type zone) {} static inline bool movable_node_is_enabled(void) { return false; } #endif / ! CONFIG_MEMORY_HOTPLUG / #if defined(CONFIG_MEMORY_HOTPLUG) \|\| defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) / * 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); } #else /* !(CONFIG_MEMORY_HOTPLUG \|\| CONFIG_DEFERRED_STRUCT_PAGE_INIT) / / * 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) {} #endif /* !(CONFIG_MEMORY_HOTPLUG \|\| CONFIG_DEFERRED_STRUCT_PAGE_INIT) / #ifdef CONFIG_MEMORY_HOTREMOVE extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); extern void try_offline_node(int nid); extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); extern int remove_memory(int nid, u64 start, u64 size); extern void __remove_memory(int nid, u64 start, u64 size); #else static inline bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages) { return false; } static inline void try_offline_node(int nid) {} static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) { return -EINVAL; } static inline int remove_memory(int nid, u64 start, u64 size) { return -EBUSY; } static inline void __remove_memory(int nid, u64 start, u64 size) {} #endif / CONFIG_MEMORY_HOTREMOVE / extern void __ref free_area_init_core_hotplug(int nid); extern int __add_memory(int nid, u64 start, u64 size); extern int add_memory(int nid, u64 start, u64 size); extern int add_memory_resource(int nid, struct resource resource); extern void move_pfn_range_to_zone(struct zone zone, unsigned long start_pfn, unsigned long nr_pages, struct vmem_altmap altmap); extern void remove_pfn_range_from_zone(struct zone zone, unsigned long start_pfn, unsigned long nr_pages); extern bool is_memblock_offlined(struct memory_block mem); extern int sparse_add_section(int nid, unsigned long pfn, unsigned long nr_pages, struct vmem_altmap altmap); extern void sparse_remove_section(struct mem_section ms, unsigned long pfn, unsigned long nr_pages, unsigned long map_offset, struct vmem_altmap altmap); extern struct page sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum); extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, int online_type); extern struct zone zone_for_pfn_range(int online_type, int nid, unsigned long start_pfn, unsigned long nr_pages); #endif / __LINUX_MEMORY_HOTPLUG_H */

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