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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * include/linux/memory.h - generic memory definition
- *
- * This is mainly for topological representation. We define the
- * basic "struct memory_block" here, which can be embedded in per-arch
- * definitions or NUMA information.
- *
- * Basic handling of the devices is done in drivers/base/memory.c
- * and system devices are handled in drivers/base/sys.c.
- *
- * Memory block are exported via sysfs in the class/memory/devices/
- * directory.
- *
- */
- #ifndef _LINUX_MEMORY_H_
- #define _LINUX_MEMORY_H_
- #include <linux/node.h>
- #include <linux/compiler.h>
- #include <linux/mutex.h>
- #include <linux/notifier.h>
- #define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS)
- /**
- * struct memory_group - a logical group of memory blocks
- * @nid: The node id for all memory blocks inside the memory group.
- * @blocks: List of all memory blocks belonging to this memory group.
- * @present_kernel_pages: Present (online) memory outside ZONE_MOVABLE of this
- * memory group.
- * @present_movable_pages: Present (online) memory in ZONE_MOVABLE of this
- * memory group.
- * @is_dynamic: The memory group type: static vs. dynamic
- * @s.max_pages: Valid with &memory_group.is_dynamic == false. The maximum
- * number of pages we'll have in this static memory group.
- * @d.unit_pages: Valid with &memory_group.is_dynamic == true. Unit in pages
- * in which memory is added/removed in this dynamic memory group.
- * This granularity defines the alignment of a unit in physical
- * address space; it has to be at least as big as a single
- * memory block.
- *
- * A memory group logically groups memory blocks; each memory block
- * belongs to at most one memory group. A memory group corresponds to
- * a memory device, such as a DIMM or a NUMA node, which spans multiple
- * memory blocks and might even span multiple non-contiguous physical memory
- * ranges.
- *
- * Modification of members after registration is serialized by memory
- * hot(un)plug code.
- */
- struct memory_group {
- int nid;
- struct list_head memory_blocks;
- unsigned long present_kernel_pages;
- unsigned long present_movable_pages;
- bool is_dynamic;
- union {
- struct {
- unsigned long max_pages;
- } s;
- struct {
- unsigned long unit_pages;
- } d;
- };
- };
- struct memory_block {
- unsigned long start_section_nr;
- unsigned long state; /* serialized by the dev->lock */
- int online_type; /* for passing data to online routine */
- int nid; /* NID for this memory block */
- /*
- * The single zone of this memory block if all PFNs of this memory block
- * that are System RAM (not a memory hole, not ZONE_DEVICE ranges) are
- * managed by a single zone. NULL if multiple zones (including nodes)
- * apply.
- */
- struct zone *zone;
- struct device dev;
- /*
- * Number of vmemmap pages. These pages
- * lay at the beginning of the memory block.
- */
- unsigned long nr_vmemmap_pages;
- struct memory_group *group; /* group (if any) for this block */
- struct list_head group_next; /* next block inside memory group */
- };
- int arch_get_memory_phys_device(unsigned long start_pfn);
- unsigned long memory_block_size_bytes(void);
- int set_memory_block_size_order(unsigned int order);
- /* These states are exposed to userspace as text strings in sysfs */
- #define MEM_ONLINE (1<<0) /* exposed to userspace */
- #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
- #define MEM_OFFLINE (1<<2) /* exposed to userspace */
- #define MEM_GOING_ONLINE (1<<3)
- #define MEM_CANCEL_ONLINE (1<<4)
- #define MEM_CANCEL_OFFLINE (1<<5)
- struct memory_notify {
- unsigned long start_pfn;
- unsigned long nr_pages;
- int status_change_nid_normal;
- int status_change_nid;
- };
- struct notifier_block;
- struct mem_section;
- /*
- * Priorities for the hotplug memory callback routines (stored in decreasing
- * order in the callback chain)
- */
- #define SLAB_CALLBACK_PRI 1
- #define IPC_CALLBACK_PRI 10
- #ifndef CONFIG_MEMORY_HOTPLUG
- static inline void memory_dev_init(void)
- {
- return;
- }
- static inline int register_memory_notifier(struct notifier_block *nb)
- {
- return 0;
- }
- static inline void unregister_memory_notifier(struct notifier_block *nb)
- {
- }
- static inline int memory_notify(unsigned long val, void *v)
- {
- return 0;
- }
- static inline int hotplug_memory_notifier(notifier_fn_t fn, int pri)
- {
- return 0;
- }
- /* These aren't inline functions due to a GCC bug. */
- #define register_hotmemory_notifier(nb) ({ (void)(nb); 0; })
- #define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
- #else /* CONFIG_MEMORY_HOTPLUG */
- extern int register_memory_notifier(struct notifier_block *nb);
- extern void unregister_memory_notifier(struct notifier_block *nb);
- int create_memory_block_devices(unsigned long start, unsigned long size,
- unsigned long vmemmap_pages,
- struct memory_group *group);
- void remove_memory_block_devices(unsigned long start, unsigned long size);
- extern void memory_dev_init(void);
- extern int memory_notify(unsigned long val, void *v);
- extern struct memory_block *find_memory_block(unsigned long section_nr);
- typedef int (*walk_memory_blocks_func_t)(struct memory_block *, void *);
- extern int walk_memory_blocks(unsigned long start, unsigned long size,
- void *arg, walk_memory_blocks_func_t func);
- extern int for_each_memory_block(void *arg, walk_memory_blocks_func_t func);
- extern int memory_group_register_static(int nid, unsigned long max_pages);
- extern int memory_group_register_dynamic(int nid, unsigned long unit_pages);
- extern int memory_group_unregister(int mgid);
- struct memory_group *memory_group_find_by_id(int mgid);
- typedef int (*walk_memory_groups_func_t)(struct memory_group *, void *);
- int walk_dynamic_memory_groups(int nid, walk_memory_groups_func_t func,
- struct memory_group *excluded, void *arg);
- #define hotplug_memory_notifier(fn, pri) ({ \
- static __meminitdata struct notifier_block fn##_mem_nb =\
- { .notifier_call = fn, .priority = pri };\
- register_memory_notifier(&fn##_mem_nb); \
- })
- #define register_hotmemory_notifier(nb) register_memory_notifier(nb)
- #define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb)
- #ifdef CONFIG_NUMA
- void memory_block_add_nid(struct memory_block *mem, int nid,
- enum meminit_context context);
- #endif /* CONFIG_NUMA */
- #endif /* CONFIG_MEMORY_HOTPLUG */
- /*
- * Kernel text modification mutex, used for code patching. Users of this lock
- * can sleep.
- */
- extern struct mutex text_mutex;
- #endif /* _LINUX_MEMORY_H_ */
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