/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/linux/memory.h - generic memory definition
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*
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* This is mainly for topological representation. We define the
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* basic "struct memory_block" here, which can be embedded in per-arch
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* definitions or NUMA information.
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*
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* Basic handling of the devices is done in drivers/base/memory.c
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* and system devices are handled in drivers/base/sys.c.
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*
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* Memory block are exported via sysfs in the class/memory/devices/
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* directory.
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*
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*/
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#ifndef _LINUX_MEMORY_H_
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#define _LINUX_MEMORY_H_
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#include <linux/node.h>
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#include <linux/compiler.h>
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#include <linux/mutex.h>
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#include <linux/notifier.h>
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#define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS)
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struct memory_block {
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unsigned long start_section_nr;
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unsigned long state; /* serialized by the dev->lock */
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int online_type; /* for passing data to online routine */
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int nid; /* NID for this memory block */
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struct device dev;
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};
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int arch_get_memory_phys_device(unsigned long start_pfn);
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unsigned long memory_block_size_bytes(void);
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int set_memory_block_size_order(unsigned int order);
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/* These states are exposed to userspace as text strings in sysfs */
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#define MEM_ONLINE (1<<0) /* exposed to userspace */
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#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
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#define MEM_OFFLINE (1<<2) /* exposed to userspace */
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#define MEM_GOING_ONLINE (1<<3)
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#define MEM_CANCEL_ONLINE (1<<4)
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#define MEM_CANCEL_OFFLINE (1<<5)
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struct memory_notify {
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unsigned long start_pfn;
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unsigned long nr_pages;
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int status_change_nid_normal;
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int status_change_nid_high;
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int status_change_nid;
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};
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struct notifier_block;
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struct mem_section;
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/*
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* Priorities for the hotplug memory callback routines (stored in decreasing
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* order in the callback chain)
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*/
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#define SLAB_CALLBACK_PRI 1
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#define IPC_CALLBACK_PRI 10
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#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
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static inline void memory_dev_init(void)
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{
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return;
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}
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static inline int register_memory_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline void unregister_memory_notifier(struct notifier_block *nb)
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{
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}
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static inline int memory_notify(unsigned long val, void *v)
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{
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return 0;
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}
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#else
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extern int register_memory_notifier(struct notifier_block *nb);
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extern void unregister_memory_notifier(struct notifier_block *nb);
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int create_memory_block_devices(unsigned long start, unsigned long size);
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void remove_memory_block_devices(unsigned long start, unsigned long size);
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extern void memory_dev_init(void);
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extern int memory_notify(unsigned long val, void *v);
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extern struct memory_block *find_memory_block(struct mem_section *);
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typedef int (*walk_memory_blocks_func_t)(struct memory_block *, void *);
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extern int walk_memory_blocks(unsigned long start, unsigned long size,
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void *arg, walk_memory_blocks_func_t func);
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extern int for_each_memory_block(void *arg, walk_memory_blocks_func_t func);
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#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
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#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
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#ifdef CONFIG_MEMORY_HOTPLUG
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#define hotplug_memory_notifier(fn, pri) ({ \
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static __meminitdata struct notifier_block fn##_mem_nb =\
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{ .notifier_call = fn, .priority = pri };\
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register_memory_notifier(&fn##_mem_nb); \
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})
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#define register_hotmemory_notifier(nb) register_memory_notifier(nb)
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#define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb)
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#else
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#define hotplug_memory_notifier(fn, pri) ({ 0; })
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/* These aren't inline functions due to a GCC bug. */
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#define register_hotmemory_notifier(nb) ({ (void)(nb); 0; })
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#define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
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#endif
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/*
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* Kernel text modification mutex, used for code patching. Users of this lock
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* can sleep.
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*/
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extern struct mutex text_mutex;
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#endif /* _LINUX_MEMORY_H_ */
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