[linux-block.git] / include / linux / memory_hotplug.h

/* 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_group;
struct resource;
struct vmem_altmap;
struct dev_pagemap;

#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.
 *
 */
extern pg_data_t *arch_alloc_nodedata(int nid);
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)

#ifdef CONFIG_NUMA
/*
 * XXX: node aware allocation 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)				\
({								\
	memblock_alloc(sizeof(*pgdat), SMP_CACHE_BYTES);	\
})

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 arch_refresh_nodedata(int nid, pg_data_t *pgdat)
{
}
#endif /* CONFIG_NUMA */
#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */

#ifdef CONFIG_MEMORY_HOTPLUG
struct page *pfn_to_online_page(unsigned long pfn);

/* 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 MHP_MERGE_RESOURCE	((__force mhp_t)BIT(0))

/*
 * We want memmap (struct page array) to be self contained.
 * To do so, we will use the beginning of the hot-added range to build
 * the page tables for the memmap array that describes the entire range.
 * Only selected architectures support it with SPARSE_VMEMMAP.
 */
#define MHP_MEMMAP_ON_MEMORY   ((__force mhp_t)BIT(1))
/*
 * The nid field specifies a memory group id (mgid) instead. The memory group
 * implies the node id (nid).
 */
#define MHP_NID_IS_MGID		((__force mhp_t)BIT(2))

/*
 * 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;
	struct dev_pagemap *pgmap;
};

bool mhp_range_allowed(u64 start, u64 size, bool need_mapping);
struct range mhp_get_pluggable_range(bool need_mapping);

/*
 * 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 void adjust_present_page_count(struct page *page,
				      struct memory_group *group,
				      long nr_pages);
/* VM interface that may be used by firmware interface */
extern int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages,
				     struct zone *zone);
extern void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages);
extern int online_pages(unsigned long pfn, unsigned long nr_pages,
			struct zone *zone, struct memory_group *group);
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 mhp_online_type_from_str(const char *str);

/* Default online_type (MMOP_*) when new memory blocks are added. */
extern int mhp_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(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 */

void get_online_mems(void);
void put_online_mems(void);

void mem_hotplug_begin(void);
void mem_hotplug_done(void);

/* See kswapd_is_running() */
static inline void pgdat_kswapd_lock(pg_data_t *pgdat)
{
	mutex_lock(&pgdat->kswapd_lock);
}

static inline void pgdat_kswapd_unlock(pg_data_t *pgdat)
{
	mutex_unlock(&pgdat->kswapd_lock);
}

static inline void pgdat_kswapd_lock_init(pg_data_t *pgdat)
{
	mutex_init(&pgdat->kswapd_lock);
}

#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 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;
}

static inline void pgdat_kswapd_lock(pg_data_t *pgdat) {}
static inline void pgdat_kswapd_unlock(pg_data_t *pgdat) {}
static inline void pgdat_kswapd_lock_init(pg_data_t *pgdat) {}
#endif /* ! CONFIG_MEMORY_HOTPLUG */

/*
 * Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some
 * platforms might override and use arch_get_mappable_range()
 * for internal non memory hotplug purposes.
 */
struct range arch_get_mappable_range(void);

#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,
			 struct zone *zone, struct memory_group *group);
extern int remove_memory(u64 start, u64 size);
extern void __remove_memory(u64 start, u64 size);
extern int offline_and_remove_memory(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,
				struct zone *zone, struct memory_group *group)
{
	return -EINVAL;
}

static inline int remove_memory(u64 start, u64 size)
{
	return -EBUSY;
}

static inline void __remove_memory(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(struct pglist_data *pgdat);
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 int sparse_add_section(int nid, unsigned long pfn,
		unsigned long nr_pages, struct vmem_altmap *altmap,
		struct dev_pagemap *pgmap);
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,
		struct memory_group *group, unsigned long start_pfn,
		unsigned long nr_pages);
extern int arch_create_linear_mapping(int nid, u64 start, u64 size,
				      struct mhp_params *params);
void arch_remove_linear_mapping(u64 start, u64 size);
extern bool mhp_supports_memmap_on_memory(unsigned long size);
#endif /* CONFIG_MEMORY_HOTPLUG */

#endif /* __LINUX_MEMORY_HOTPLUG_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
208d54e5 DH	2	#ifndef __LINUX_MEMORY_HOTPLUG_H
	3	#define __LINUX_MEMORY_HOTPLUG_H
	4
	5	#include <linux/mmzone.h>
	6	#include <linux/spinlock.h>
3947be19	7	#include <linux/notifier.h>
187f1882	8	#include <linux/bug.h>
208d54e5	9
78679302 KH	10	struct page;
	11	struct zone;
	12	struct pglist_data;
ea01ea93	13	struct mem_section;
836809ec	14	struct memory_group;
62cedb9f	15	struct resource;
24e6d5a5	16	struct vmem_altmap;
e3246d8f	17	struct dev_pagemap;
78679302	18
e930d999 MH	19	#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
	20	/*
	21	* For supporting node-hotadd, we have to allocate a new pgdat.
	22	*
	23	* If an arch has generic style NODE_DATA(),
	24	* node_data[nid] = kzalloc() works well. But it depends on the architecture.
	25	*
	26	* In general, generic_alloc_nodedata() is used.
e930d999 MH	27	*
	28	*/
	29	extern pg_data_t *arch_alloc_nodedata(int nid);
e930d999 MH	30	extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
	31
	32	#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	33
	34	#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
e930d999 MH	35
	36	#ifdef CONFIG_NUMA
	37	/*
	38	* XXX: node aware allocation can't work well to get new node's memory at this time.
	39	* Because, pgdat for the new node is not allocated/initialized yet itself.
	40	* To use new node's memory, more consideration will be necessary.
	41	*/
	42	#define generic_alloc_nodedata(nid) \
	43	({ \
09f49dca	44	memblock_alloc(sizeof(*pgdat), SMP_CACHE_BYTES); \
e930d999	45	})
e930d999 MH	46
	47	extern pg_data_t *node_data[];
	48	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	49	{
	50	node_data[nid] = pgdat;
	51	}
	52
	53	#else /* !CONFIG_NUMA */
	54
	55	/* never called */
	56	static inline pg_data_t *generic_alloc_nodedata(int nid)
	57	{
	58	BUG();
	59	return NULL;
	60	}
e930d999 MH	61	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	62	{
	63	}
	64	#endif /* CONFIG_NUMA */
	65	#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	66
208d54e5	67	#ifdef CONFIG_MEMORY_HOTPLUG
9f605f26	68	struct page *pfn_to_online_page(unsigned long pfn);
04753278	69
4f7c6b49	70	/* Types for control the zone type of onlined and offlined memory */
511c2aba	71	enum {
956f8b44	72	/* Offline the memory. */
efc978ad	73	MMOP_OFFLINE = 0,
956f8b44 DH	74	/* Online the memory. Zone depends, see default_zone_for_pfn(). */
	75	MMOP_ONLINE,
	76	/* Online the memory to ZONE_NORMAL. */
4f7c6b49	77	MMOP_ONLINE_KERNEL,
956f8b44	78	/* Online the memory to ZONE_MOVABLE. */
4f7c6b49	79	MMOP_ONLINE_MOVABLE,
511c2aba LJ	80	};
511c2aba LJ	81
b6117199 DH	82	/* Flags for add_memory() and friends to specify memory hotplug details. */
	83	typedef int __bitwise mhp_t;
	84
	85	/* No special request */
	86	#define MHP_NONE ((__force mhp_t)0)
9ca6551e DH	87	/*
	88	* Allow merging of the added System RAM resource with adjacent,
	89	* mergeable resources. After a successful call to add_memory_resource()
	90	* with this flag set, the resource pointer must no longer be used as it
	91	* might be stale, or the resource might have changed.
	92	*/
26011267	93	#define MHP_MERGE_RESOURCE ((__force mhp_t)BIT(0))
b6117199	94
a08a2ae3 OS	95	/*
	96	* We want memmap (struct page array) to be self contained.
	97	* To do so, we will use the beginning of the hot-added range to build
	98	* the page tables for the memmap array that describes the entire range.
	99	* Only selected architectures support it with SPARSE_VMEMMAP.
	100	*/
	101	#define MHP_MEMMAP_ON_MEMORY ((__force mhp_t)BIT(1))
028fc57a DH	102	/*
	103	* The nid field specifies a memory group id (mgid) instead. The memory group
	104	* implies the node id (nid).
	105	*/
	106	#define MHP_NID_IS_MGID ((__force mhp_t)BIT(2))
a08a2ae3	107
940519f0	108	/*
f5637d3b LG	109	* Extended parameters for memory hotplug:
f5637d3b LG	110	* altmap: alternative allocator for memmap array (optional)
bfeb022f LG	111	* pgprot: page protection flags to apply to newly created page tables
bfeb022f LG	112	* (required)
940519f0	113	*/
f5637d3b	114	struct mhp_params {
940519f0	115	struct vmem_altmap *altmap;
bfeb022f	116	pgprot_t pgprot;
e3246d8f	117	struct dev_pagemap *pgmap;
940519f0 MH	118	};
940519f0 MH	119
bca3feaa AK	120	bool mhp_range_allowed(u64 start, u64 size, bool need_mapping);
	121	struct range mhp_get_pluggable_range(bool need_mapping);
	122
bdc8cb98 DH	123	/*
bdc8cb98 DH	124	* Zone resizing functions
511c2aba LJ	125	*
	126	* Note: any attempt to resize a zone should has pgdat_resize_lock()
	127	* zone_span_writelock() both held. This ensure the size of a zone
	128	* can't be changed while pgdat_resize_lock() held.
bdc8cb98 DH	129	*/
	130	static inline unsigned zone_span_seqbegin(struct zone *zone)
	131	{
	132	return read_seqbegin(&zone->span_seqlock);
	133	}
	134	static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
	135	{
	136	return read_seqretry(&zone->span_seqlock, iv);
	137	}
	138	static inline void zone_span_writelock(struct zone *zone)
	139	{
	140	write_seqlock(&zone->span_seqlock);
	141	}
	142	static inline void zone_span_writeunlock(struct zone *zone)
	143	{
	144	write_sequnlock(&zone->span_seqlock);
	145	}
	146	static inline void zone_seqlock_init(struct zone *zone)
	147	{
	148	seqlock_init(&zone->span_seqlock);
	149	}
836809ec DH	150	extern void adjust_present_page_count(struct page *page,
	151	struct memory_group *group,
	152	long nr_pages);
3947be19	153	/* VM interface that may be used by firmware interface */
a08a2ae3 OS	154	extern int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages,
	155	struct zone *zone);
	156	extern void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages);
bd5c2344	157	extern int online_pages(unsigned long pfn, unsigned long nr_pages,
836809ec	158	struct zone zone, struct memory_group group);
257bea71 DH	159	extern void __offline_isolated_pages(unsigned long start_pfn,
257bea71 DH	160	unsigned long end_pfn);
48e94196	161
a9cd410a	162	typedef void (online_page_callback_t)(struct page page, unsigned int order);
9d0ad8ca	163
18db1491	164	extern void generic_online_page(struct page *page, unsigned int order);
9d0ad8ca DK	165	extern int set_online_page_callback(online_page_callback_t callback);
	166	extern int restore_online_page_callback(online_page_callback_t callback);
	167
01b0f197 TK	168	extern int try_online_node(int nid);
01b0f197 TK	169
940519f0	170	extern int arch_add_memory(int nid, u64 start, u64 size,
f5637d3b	171	struct mhp_params *params);
357b4da5 JG	172	extern u64 max_mem_size;
357b4da5 JG	173
1adf8b46	174	extern int mhp_online_type_from_str(const char *str);
5f47adf7	175
862919e5	176	/* Default online_type (MMOP_) when new memory blocks are added. /
1adf8b46	177	extern int mhp_default_online_type;
4932381e MH	178	/* If movable_node boot option specified */
	179	extern bool movable_node_enabled;
	180	static inline bool movable_node_is_enabled(void)
	181	{
	182	return movable_node_enabled;
	183	}
31bc3858	184
65a2aa5f	185	extern void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap);
feee6b29 DH	186	extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
feee6b29 DH	187	struct vmem_altmap *altmap);
49ac8255	188
f1dd2cd1	189	/* reasonably generic interface to expand the physical pages */
24e6d5a5	190	extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
f5637d3b	191	struct mhp_params *params);
bc02af93	192
3072e413 MH	193	#ifndef CONFIG_ARCH_HAS_ADD_PAGES
3072e413 MH	194	static inline int add_pages(int nid, unsigned long start_pfn,
f5637d3b	195	unsigned long nr_pages, struct mhp_params *params)
3072e413	196	{
f5637d3b	197	return __add_pages(nid, start_pfn, nr_pages, params);
3072e413 MH	198	}
3072e413 MH	199	#else /* ARCH_HAS_ADD_PAGES */
24e6d5a5	200	int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
f5637d3b	201	struct mhp_params *params);
3072e413 MH	202	#endif /* ARCH_HAS_ADD_PAGES */
3072e413 MH	203
bfc8c901 VD	204	void get_online_mems(void);
bfc8c901 VD	205	void put_online_mems(void);
20d6c96b	206
30467e0b DR	207	void mem_hotplug_begin(void);
	208	void mem_hotplug_done(void);
	209
b4a0215e KW	210	/* See kswapd_is_running() */
	211	static inline void pgdat_kswapd_lock(pg_data_t *pgdat)
	212	{
	213	mutex_lock(&pgdat->kswapd_lock);
	214	}
	215
	216	static inline void pgdat_kswapd_unlock(pg_data_t *pgdat)
	217	{
	218	mutex_unlock(&pgdat->kswapd_lock);
	219	}
	220
	221	static inline void pgdat_kswapd_lock_init(pg_data_t *pgdat)
	222	{
	223	mutex_init(&pgdat->kswapd_lock);
	224	}
	225
208d54e5	226	#else /* ! CONFIG_MEMORY_HOTPLUG */
2d070eab MH	227	#define pfn_to_online_page(pfn) \
	228	({ \
	229	struct page *___page = NULL; \
	230	if (pfn_valid(pfn)) \
	231	___page = pfn_to_page(pfn); \
	232	___page; \
	233	})
	234
bdc8cb98 DH	235	static inline unsigned zone_span_seqbegin(struct zone *zone)
	236	{
	237	return 0;
	238	}
	239	static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
	240	{
	241	return 0;
	242	}
	243	static inline void zone_span_writelock(struct zone *zone) {}
	244	static inline void zone_span_writeunlock(struct zone *zone) {}
	245	static inline void zone_seqlock_init(struct zone *zone) {}
3947be19	246
01b0f197 TK	247	static inline int try_online_node(int nid)
	248	{
	249	return 0;
	250	}
	251
bfc8c901 VD	252	static inline void get_online_mems(void) {}
bfc8c901 VD	253	static inline void put_online_mems(void) {}
20d6c96b	254
30467e0b DR	255	static inline void mem_hotplug_begin(void) {}
	256	static inline void mem_hotplug_done(void) {}
	257
4932381e MH	258	static inline bool movable_node_is_enabled(void)
	259	{
	260	return false;
	261	}
b4a0215e KW	262
	263	static inline void pgdat_kswapd_lock(pg_data_t *pgdat) {}
	264	static inline void pgdat_kswapd_unlock(pg_data_t *pgdat) {}
	265	static inline void pgdat_kswapd_lock_init(pg_data_t *pgdat) {}
bdc8cb98	266	#endif /* ! CONFIG_MEMORY_HOTPLUG */
9d99aaa3	267
bca3feaa AK	268	/*
	269	* Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some
	270	* platforms might override and use arch_get_mappable_range()
	271	* for internal non memory hotplug purposes.
	272	*/
	273	struct range arch_get_mappable_range(void);
	274
3a2d7fa8 PT	275	#if defined(CONFIG_MEMORY_HOTPLUG) \|\| defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
	276	/*
	277	* pgdat resizing functions
	278	*/
	279	static inline
	280	void pgdat_resize_lock(struct pglist_data pgdat, unsigned long flags)
	281	{
	282	spin_lock_irqsave(&pgdat->node_size_lock, *flags);
	283	}
	284	static inline
	285	void pgdat_resize_unlock(struct pglist_data pgdat, unsigned long flags)
	286	{
	287	spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
	288	}
	289	static inline
	290	void pgdat_resize_init(struct pglist_data *pgdat)
	291	{
	292	spin_lock_init(&pgdat->node_size_lock);
	293	}
	294	#else /* !(CONFIG_MEMORY_HOTPLUG \|\| CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
	295	/*
	296	* Stub functions for when hotplug is off
	297	*/
	298	static inline void pgdat_resize_lock(struct pglist_data p, unsigned long f) {}
	299	static inline void pgdat_resize_unlock(struct pglist_data p, unsigned long f) {}
	300	static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
	301	#endif /* !(CONFIG_MEMORY_HOTPLUG \|\| CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
	302
5c755e9f BP	303	#ifdef CONFIG_MEMORY_HOTREMOVE
5c755e9f BP	304
90b30cdc	305	extern void try_offline_node(int nid);
836809ec	306	extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages,
395f6081	307	struct zone zone, struct memory_group group);
e1c158e4 DH	308	extern int remove_memory(u64 start, u64 size);
	309	extern void __remove_memory(u64 start, u64 size);
	310	extern int offline_and_remove_memory(u64 start, u64 size);
5c755e9f BP	311
5c755e9f BP	312	#else
90b30cdc	313	static inline void try_offline_node(int nid) {}
aba6efc4	314
836809ec	315	static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages,
395f6081	316	struct zone zone, struct memory_group group)
aba6efc4 RW	317	{
	318	return -EINVAL;
	319	}
	320
e1c158e4	321	static inline int remove_memory(u64 start, u64 size)
eca499ab PT	322	{
	323	return -EBUSY;
	324	}
	325
e1c158e4	326	static inline void __remove_memory(u64 start, u64 size) {}
5c755e9f BP	327	#endif /* CONFIG_MEMORY_HOTREMOVE */
5c755e9f BP	328
aba9817d BDC	329	extern void set_zone_contiguous(struct zone *zone);
	330	extern void clear_zone_contiguous(struct zone *zone);
	331
3a0aaefe	332	#ifdef CONFIG_MEMORY_HOTPLUG
70b5b46a	333	extern void __ref free_area_init_core_hotplug(struct pglist_data *pgdat);
b6117199 DH	334	extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
	335	extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
	336	extern int add_memory_resource(int nid, struct resource *resource,
	337	mhp_t mhp_flags);
7b7b2721	338	extern int add_memory_driver_managed(int nid, u64 start, u64 size,
b6117199 DH	339	const char *resource_name,
b6117199 DH	340	mhp_t mhp_flags);
f1dd2cd1	341	extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
d882c006 DH	342	unsigned long nr_pages,
d882c006 DH	343	struct vmem_altmap *altmap, int migratetype);
feee6b29 DH	344	extern void remove_pfn_range_from_zone(struct zone *zone,
	345	unsigned long start_pfn,
	346	unsigned long nr_pages);
7ea62160	347	extern int sparse_add_section(int nid, unsigned long pfn,
e3246d8f JM	348	unsigned long nr_pages, struct vmem_altmap *altmap,
e3246d8f JM	349	struct dev_pagemap *pgmap);
ba72b4c8	350	extern void sparse_remove_section(struct mem_section *ms,
7ea62160	351	unsigned long pfn, unsigned long nr_pages,
24b6d416	352	unsigned long map_offset, struct vmem_altmap *altmap);
04753278 YG	353	extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
04753278 YG	354	unsigned long pnum);
7cf209ba	355	extern struct zone *zone_for_pfn_range(int online_type, int nid,
445fcf7c DH	356	struct memory_group *group, unsigned long start_pfn,
445fcf7c DH	357	unsigned long nr_pages);
4abb1e5b DH	358	extern int arch_create_linear_mapping(int nid, u64 start, u64 size,
	359	struct mhp_params *params);
	360	void arch_remove_linear_mapping(u64 start, u64 size);
a08a2ae3	361	extern bool mhp_supports_memmap_on_memory(unsigned long size);
3a0aaefe DH	362	#endif /* CONFIG_MEMORY_HOTPLUG */
3a0aaefe DH	363
208d54e5	364	#endif /* __LINUX_MEMORY_HOTPLUG_H */