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184 lines
6.3 KiB
184 lines
6.3 KiB
/* 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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