/* 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 { /* Offline the memory. */ MMOP_OFFLINE = 0, /* Online the memory. Zone depends, see default_zone_for_pfn(). */ MMOP_ONLINE, /* Online the memory to ZONE_NORMAL. */ MMOP_ONLINE_KERNEL, /* Online the memory to ZONE_MOVABLE. */ MMOP_ONLINE_MOVABLE, }; /* Flags for add_memory() and friends to specify memory hotplug details. */ typedef int __bitwise mhp_t; /* No special request */ #define MHP_NONE ((__force mhp_t)0) /* * Allow merging of the added System RAM resource with adjacent, * mergeable resources. After a successful call to add_memory_resource() * with this flag set, the resource pointer must no longer be used as it * might be stale, or the resource might have changed. */ #define MEMHP_MERGE_RESOURCE ((__force mhp_t)BIT(0)) /* * Extended parameters for memory hotplug: * altmap: alternative allocator for memmap array (optional) * pgprot: page protection flags to apply to newly created page tables * (required) */ struct mhp_params { struct vmem_altmap *altmap; pgprot_t pgprot; }; /* * 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 pfn, unsigned long nr_pages, int online_type, int nid); extern struct zone *test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn); extern void __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn); typedef void (*online_page_callback_t)(struct page *page, unsigned int order); extern void generic_online_page(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 int try_online_node(int nid); extern int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params); extern u64 max_mem_size; extern int memhp_online_type_from_str(const char *str); /* Default online_type (MMOP_*) when new memory blocks are added. */ extern int memhp_default_online_type; /* 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_params *params); #ifndef CONFIG_ARCH_HAS_ADD_PAGES static inline int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, struct mhp_params *params) { return __add_pages(nid, start_pfn, nr_pages, params); } #else /* ARCH_HAS_ADD_PAGES */ int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, struct mhp_params *params); #endif /* ARCH_HAS_ADD_PAGES */ #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); #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 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 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 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); extern int offline_and_remove_memory(int nid, u64 start, u64 size); #else 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 set_zone_contiguous(struct zone *zone); extern void clear_zone_contiguous(struct zone *zone); #ifdef CONFIG_MEMORY_HOTPLUG extern void __ref free_area_init_core_hotplug(int nid); extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags); extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags); extern int add_memory_resource(int nid, struct resource *resource, mhp_t mhp_flags); extern int add_memory_driver_managed(int nid, u64 start, u64 size, const char *resource_name, mhp_t mhp_flags); extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, unsigned long nr_pages, struct vmem_altmap *altmap, int migratetype); 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 struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, unsigned long nr_pages); #endif /* CONFIG_MEMORY_HOTPLUG */ #endif /* __LINUX_MEMORY_HOTPLUG_H */