/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_MEMORY_HOTPLUG_H
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#define __LINUX_MEMORY_HOTPLUG_H
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#include <linux/mmzone.h>
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#include <linux/spinlock.h>
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#include <linux/notifier.h>
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#include <linux/bug.h>
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struct page;
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struct zone;
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struct pglist_data;
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struct mem_section;
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struct memory_block;
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struct resource;
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struct vmem_altmap;
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#ifdef CONFIG_MEMORY_HOTPLUG
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/*
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* Return page for the valid pfn only if the page is online. All pfn
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* walkers which rely on the fully initialized page->flags and others
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* should use this rather than pfn_valid && pfn_to_page
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*/
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#define pfn_to_online_page(pfn) \
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({ \
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struct page *___page = NULL; \
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unsigned long ___pfn = pfn; \
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unsigned long ___nr = pfn_to_section_nr(___pfn); \
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\
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if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \
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pfn_valid_within(___pfn)) \
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___page = pfn_to_page(___pfn); \
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___page; \
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})
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/*
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* Types for free bootmem stored in page->lru.next. These have to be in
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* some random range in unsigned long space for debugging purposes.
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*/
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enum {
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MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
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SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
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MIX_SECTION_INFO,
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NODE_INFO,
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MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
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};
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/* Types for control the zone type of onlined and offlined memory */
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enum {
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/* Offline the memory. */
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MMOP_OFFLINE = 0,
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/* Online the memory. Zone depends, see default_zone_for_pfn(). */
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MMOP_ONLINE,
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/* Online the memory to ZONE_NORMAL. */
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MMOP_ONLINE_KERNEL,
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/* Online the memory to ZONE_MOVABLE. */
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MMOP_ONLINE_MOVABLE,
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};
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/* Flags for add_memory() and friends to specify memory hotplug details. */
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typedef int __bitwise mhp_t;
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/* No special request */
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#define MHP_NONE ((__force mhp_t)0)
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/*
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* Allow merging of the added System RAM resource with adjacent,
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* mergeable resources. After a successful call to add_memory_resource()
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* with this flag set, the resource pointer must no longer be used as it
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* might be stale, or the resource might have changed.
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*/
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#define MEMHP_MERGE_RESOURCE ((__force mhp_t)BIT(0))
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/*
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* Extended parameters for memory hotplug:
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* altmap: alternative allocator for memmap array (optional)
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* pgprot: page protection flags to apply to newly created page tables
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* (required)
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*/
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struct mhp_params {
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struct vmem_altmap *altmap;
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pgprot_t pgprot;
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};
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/*
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* Zone resizing functions
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*
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* Note: any attempt to resize a zone should has pgdat_resize_lock()
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* zone_span_writelock() both held. This ensure the size of a zone
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* can't be changed while pgdat_resize_lock() held.
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*/
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static inline unsigned zone_span_seqbegin(struct zone *zone)
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{
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return read_seqbegin(&zone->span_seqlock);
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}
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static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
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{
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return read_seqretry(&zone->span_seqlock, iv);
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}
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static inline void zone_span_writelock(struct zone *zone)
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{
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write_seqlock(&zone->span_seqlock);
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}
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static inline void zone_span_writeunlock(struct zone *zone)
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{
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write_sequnlock(&zone->span_seqlock);
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}
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static inline void zone_seqlock_init(struct zone *zone)
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{
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seqlock_init(&zone->span_seqlock);
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}
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extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
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extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
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extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
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/* VM interface that may be used by firmware interface */
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extern int online_pages(unsigned long pfn, unsigned long nr_pages,
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int online_type, int nid);
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extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
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unsigned long end_pfn);
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extern void __offline_isolated_pages(unsigned long start_pfn,
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unsigned long end_pfn);
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typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
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extern void generic_online_page(struct page *page, unsigned int order);
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extern int set_online_page_callback(online_page_callback_t callback);
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extern int restore_online_page_callback(online_page_callback_t callback);
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extern int try_online_node(int nid);
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extern int arch_add_memory(int nid, u64 start, u64 size,
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struct mhp_params *params);
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extern u64 max_mem_size;
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extern int memhp_online_type_from_str(const char *str);
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/* Default online_type (MMOP_*) when new memory blocks are added. */
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extern int memhp_default_online_type;
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/* If movable_node boot option specified */
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extern bool movable_node_enabled;
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static inline bool movable_node_is_enabled(void)
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{
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return movable_node_enabled;
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}
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extern void arch_remove_memory(int nid, u64 start, u64 size,
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struct vmem_altmap *altmap);
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extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
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struct vmem_altmap *altmap);
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/* reasonably generic interface to expand the physical pages */
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extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
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struct mhp_params *params);
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#ifndef CONFIG_ARCH_HAS_ADD_PAGES
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static inline int add_pages(int nid, unsigned long start_pfn,
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unsigned long nr_pages, struct mhp_params *params)
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{
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return __add_pages(nid, start_pfn, nr_pages, params);
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}
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#else /* ARCH_HAS_ADD_PAGES */
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int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
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struct mhp_params *params);
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#endif /* ARCH_HAS_ADD_PAGES */
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#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
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/*
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* For supporting node-hotadd, we have to allocate a new pgdat.
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*
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* If an arch has generic style NODE_DATA(),
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* node_data[nid] = kzalloc() works well. But it depends on the architecture.
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*
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* In general, generic_alloc_nodedata() is used.
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* Now, arch_free_nodedata() is just defined for error path of node_hot_add.
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*
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*/
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extern pg_data_t *arch_alloc_nodedata(int nid);
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extern void arch_free_nodedata(pg_data_t *pgdat);
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extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
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#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
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#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
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#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
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#ifdef CONFIG_NUMA
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/*
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* If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
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* XXX: kmalloc_node() can't work well to get new node's memory at this time.
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* Because, pgdat for the new node is not allocated/initialized yet itself.
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* To use new node's memory, more consideration will be necessary.
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*/
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#define generic_alloc_nodedata(nid) \
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({ \
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kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
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})
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/*
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* This definition is just for error path in node hotadd.
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* For node hotremove, we have to replace this.
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*/
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#define generic_free_nodedata(pgdat) kfree(pgdat)
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extern pg_data_t *node_data[];
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static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
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{
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node_data[nid] = pgdat;
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}
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#else /* !CONFIG_NUMA */
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/* never called */
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static inline pg_data_t *generic_alloc_nodedata(int nid)
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{
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BUG();
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return NULL;
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}
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static inline void generic_free_nodedata(pg_data_t *pgdat)
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{
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}
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static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
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{
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}
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#endif /* CONFIG_NUMA */
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#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
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#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
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extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
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#else
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static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
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{
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}
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#endif
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extern void put_page_bootmem(struct page *page);
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extern void get_page_bootmem(unsigned long ingo, struct page *page,
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unsigned long type);
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void get_online_mems(void);
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void put_online_mems(void);
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void mem_hotplug_begin(void);
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void mem_hotplug_done(void);
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#else /* ! CONFIG_MEMORY_HOTPLUG */
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#define pfn_to_online_page(pfn) \
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({ \
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struct page *___page = NULL; \
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if (pfn_valid(pfn)) \
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___page = pfn_to_page(pfn); \
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___page; \
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})
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static inline unsigned zone_span_seqbegin(struct zone *zone)
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{
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return 0;
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}
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static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
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{
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return 0;
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}
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static inline void zone_span_writelock(struct zone *zone) {}
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static inline void zone_span_writeunlock(struct zone *zone) {}
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static inline void zone_seqlock_init(struct zone *zone) {}
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static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
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{
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}
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static inline int try_online_node(int nid)
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{
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return 0;
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}
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static inline void get_online_mems(void) {}
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static inline void put_online_mems(void) {}
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static inline void mem_hotplug_begin(void) {}
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static inline void mem_hotplug_done(void) {}
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static inline bool movable_node_is_enabled(void)
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{
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return false;
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}
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#endif /* ! CONFIG_MEMORY_HOTPLUG */
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#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
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/*
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* pgdat resizing functions
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*/
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static inline
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void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
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{
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spin_lock_irqsave(&pgdat->node_size_lock, *flags);
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}
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static inline
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void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
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{
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spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
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}
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static inline
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void pgdat_resize_init(struct pglist_data *pgdat)
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{
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spin_lock_init(&pgdat->node_size_lock);
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}
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#else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
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/*
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* Stub functions for when hotplug is off
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*/
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static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
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static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
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static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
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#endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
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#ifdef CONFIG_MEMORY_HOTREMOVE
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extern void try_offline_node(int nid);
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extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
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extern int remove_memory(int nid, u64 start, u64 size);
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extern int remove_memory_subsection(int nid, u64 start, u64 size);
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extern void __remove_memory(int nid, u64 start, u64 size);
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extern int offline_and_remove_memory(int nid, u64 start, u64 size);
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#else
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static inline void try_offline_node(int nid) {}
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static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
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{
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return -EINVAL;
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}
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static inline int remove_memory(int nid, u64 start, u64 size)
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{
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return -EBUSY;
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}
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static inline void __remove_memory(int nid, u64 start, u64 size) {}
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#endif /* CONFIG_MEMORY_HOTREMOVE */
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extern void set_zone_contiguous(struct zone *zone);
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extern void clear_zone_contiguous(struct zone *zone);
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#ifdef CONFIG_MEMORY_HOTPLUG
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extern void __ref free_area_init_core_hotplug(int nid);
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extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
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extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
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extern int add_memory_subsection(int nid, u64 start, u64 size);
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extern int add_memory_resource(int nid, struct resource *resource,
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mhp_t mhp_flags);
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extern int add_memory_driver_managed(int nid, u64 start, u64 size,
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const char *resource_name,
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mhp_t mhp_flags);
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extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
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unsigned long nr_pages,
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struct vmem_altmap *altmap, int migratetype);
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extern void remove_pfn_range_from_zone(struct zone *zone,
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unsigned long start_pfn,
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unsigned long nr_pages);
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extern bool is_memblock_offlined(struct memory_block *mem);
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extern int sparse_add_section(int nid, unsigned long pfn,
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unsigned long nr_pages, struct vmem_altmap *altmap);
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extern void sparse_remove_section(struct mem_section *ms,
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unsigned long pfn, unsigned long nr_pages,
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unsigned long map_offset, struct vmem_altmap *altmap);
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extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
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unsigned long pnum);
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extern struct zone *zone_for_pfn_range(int online_type, int nid,
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unsigned long start_pfn, unsigned long nr_pages);
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#endif /* CONFIG_MEMORY_HOTPLUG */
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#endif /* __LINUX_MEMORY_HOTPLUG_H */
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