185 lines
6.3 KiB
C
185 lines
6.3 KiB
C
/* 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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/**
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* struct memory_group - a logical group of memory blocks
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* @nid: The node id for all memory blocks inside the memory group.
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* @blocks: List of all memory blocks belonging to this memory group.
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* @present_kernel_pages: Present (online) memory outside ZONE_MOVABLE of this
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* memory group.
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* @present_movable_pages: Present (online) memory in ZONE_MOVABLE of this
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* memory group.
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* @is_dynamic: The memory group type: static vs. dynamic
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* @s.max_pages: Valid with &memory_group.is_dynamic == false. The maximum
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* number of pages we'll have in this static memory group.
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* @d.unit_pages: Valid with &memory_group.is_dynamic == true. Unit in pages
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* in which memory is added/removed in this dynamic memory group.
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* This granularity defines the alignment of a unit in physical
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* address space; it has to be at least as big as a single
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* memory block.
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*
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* A memory group logically groups memory blocks; each memory block
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* belongs to at most one memory group. A memory group corresponds to
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* a memory device, such as a DIMM or a NUMA node, which spans multiple
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* memory blocks and might even span multiple non-contiguous physical memory
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* ranges.
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*
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* Modification of members after registration is serialized by memory
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* hot(un)plug code.
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*/
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struct memory_group {
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int nid;
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struct list_head memory_blocks;
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unsigned long present_kernel_pages;
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unsigned long present_movable_pages;
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bool is_dynamic;
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union {
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struct {
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unsigned long max_pages;
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} s;
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struct {
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unsigned long unit_pages;
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} d;
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};
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};
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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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/*
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* The single zone of this memory block if all PFNs of this memory block
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* that are System RAM (not a memory hole, not ZONE_DEVICE ranges) are
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* managed by a single zone. NULL if multiple zones (including nodes)
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* apply.
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*/
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struct zone *zone;
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struct device dev;
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/*
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* Number of vmemmap pages. These pages
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* lay at the beginning of the memory block.
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*/
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unsigned long nr_vmemmap_pages;
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struct memory_group *group; /* group (if any) for this block */
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struct list_head group_next; /* next block inside memory group */
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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;
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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
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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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static inline int hotplug_memory_notifier(notifier_fn_t fn, int pri)
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{
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return 0;
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}
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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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#else /* CONFIG_MEMORY_HOTPLUG */
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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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unsigned long vmemmap_pages,
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struct memory_group *group);
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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(unsigned long section_nr);
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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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extern int memory_group_register_static(int nid, unsigned long max_pages);
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extern int memory_group_register_dynamic(int nid, unsigned long unit_pages);
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extern int memory_group_unregister(int mgid);
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struct memory_group *memory_group_find_by_id(int mgid);
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typedef int (*walk_memory_groups_func_t)(struct memory_group *, void *);
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int walk_dynamic_memory_groups(int nid, walk_memory_groups_func_t func,
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struct memory_group *excluded, void *arg);
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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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#ifdef CONFIG_NUMA
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void memory_block_add_nid(struct memory_block *mem, int nid,
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enum meminit_context context);
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#endif /* CONFIG_NUMA */
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#endif /* CONFIG_MEMORY_HOTPLUG */
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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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