384 lines
12 KiB
C
384 lines
12 KiB
C
/* 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_group;
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struct resource;
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struct vmem_altmap;
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struct dev_pagemap;
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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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*
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*/
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extern pg_data_t *arch_alloc_nodedata(int nid);
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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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#ifdef CONFIG_NUMA
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/*
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* XXX: node aware allocation 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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memblock_alloc(sizeof(*pgdat), SMP_CACHE_BYTES); \
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})
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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 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_MEMORY_HOTPLUG
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struct page *pfn_to_online_page(unsigned long pfn);
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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 MHP_MERGE_RESOURCE ((__force mhp_t)BIT(0))
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/*
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* We want memmap (struct page array) to be self contained.
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* To do so, we will use the beginning of the hot-added range to build
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* the page tables for the memmap array that describes the entire range.
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* Only selected architectures support it with SPARSE_VMEMMAP.
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* This is only a hint, the core kernel can decide to not do this based on
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* different alignment checks.
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*/
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#define MHP_MEMMAP_ON_MEMORY ((__force mhp_t)BIT(1))
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/*
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* The nid field specifies a memory group id (mgid) instead. The memory group
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* implies the node id (nid).
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*/
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#define MHP_NID_IS_MGID ((__force mhp_t)BIT(2))
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/*
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* The hotplugged memory is completely inaccessible while the memory is
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* offline. The memory provider will handle MEM_PREPARE_ONLINE /
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* MEM_FINISH_OFFLINE notifications and make the memory accessible.
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*
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* This flag is only relevant when used along with MHP_MEMMAP_ON_MEMORY,
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* because the altmap cannot be written (e.g., poisoned) when adding
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* memory -- before it is set online.
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*
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* This allows for adding memory with an altmap that is not currently
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* made available by a hypervisor. When onlining that memory, the
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* hypervisor can be instructed to make that memory available, and
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* the onlining phase will not require any memory allocations, which is
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* helpful in low-memory situations.
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*/
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#define MHP_OFFLINE_INACCESSIBLE ((__force mhp_t)BIT(3))
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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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struct dev_pagemap *pgmap;
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};
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bool mhp_range_allowed(u64 start, u64 size, bool need_mapping);
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struct range mhp_get_pluggable_range(bool need_mapping);
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bool mhp_supports_memmap_on_memory(void);
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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 void adjust_present_page_count(struct page *page,
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struct memory_group *group,
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long nr_pages);
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/* VM interface that may be used by firmware interface */
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extern int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages,
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struct zone *zone, bool mhp_off_inaccessible);
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extern void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages);
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extern int online_pages(unsigned long pfn, unsigned long nr_pages,
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struct zone *zone, struct memory_group *group);
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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 mhp_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 mhp_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(u64 start, u64 size, 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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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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/* See kswapd_is_running() */
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static inline void pgdat_kswapd_lock(pg_data_t *pgdat)
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{
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mutex_lock(&pgdat->kswapd_lock);
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}
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static inline void pgdat_kswapd_unlock(pg_data_t *pgdat)
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{
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mutex_unlock(&pgdat->kswapd_lock);
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}
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static inline void pgdat_kswapd_lock_init(pg_data_t *pgdat)
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{
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mutex_init(&pgdat->kswapd_lock);
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}
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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 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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static inline bool mhp_supports_memmap_on_memory(void)
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{
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return false;
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}
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static inline void pgdat_kswapd_lock(pg_data_t *pgdat) {}
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static inline void pgdat_kswapd_unlock(pg_data_t *pgdat) {}
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static inline void pgdat_kswapd_lock_init(pg_data_t *pgdat) {}
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#endif /* ! CONFIG_MEMORY_HOTPLUG */
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/*
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* Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some
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* platforms might override and use arch_get_mappable_range()
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* for internal non memory hotplug purposes.
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*/
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struct range arch_get_mappable_range(void);
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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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struct zone *zone, struct memory_group *group);
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extern int remove_memory(u64 start, u64 size);
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extern void __remove_memory(u64 start, u64 size);
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extern int offline_and_remove_memory(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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struct zone *zone, struct memory_group *group)
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{
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return -EINVAL;
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}
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static inline int remove_memory(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(u64 start, u64 size) {}
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#endif /* CONFIG_MEMORY_HOTREMOVE */
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#ifdef CONFIG_MEMORY_HOTPLUG
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extern void __ref free_area_init_core_hotplug(struct pglist_data *pgdat);
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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_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 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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struct dev_pagemap *pgmap);
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extern void sparse_remove_section(unsigned long pfn, unsigned long nr_pages,
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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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struct memory_group *group, unsigned long start_pfn,
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unsigned long nr_pages);
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extern int arch_create_linear_mapping(int nid, u64 start, u64 size,
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struct mhp_params *params);
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void arch_remove_linear_mapping(u64 start, u64 size);
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#endif /* CONFIG_MEMORY_HOTPLUG */
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#endif /* __LINUX_MEMORY_HOTPLUG_H */
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