| /* 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_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 */ |
| struct device dev; |
| }; |
| |
| 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_high; |
| 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_SPARSE |
| 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; |
| } |
| #else |
| 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); |
| 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(struct mem_section *); |
| 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); |
| #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) |
| #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
| |
| #ifdef CONFIG_MEMORY_HOTPLUG |
| #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) |
| #else |
| #define hotplug_memory_notifier(fn, pri) ({ 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); }) |
| #endif |
| |
| /* |
| * Kernel text modification mutex, used for code patching. Users of this lock |
| * can sleep. |
| */ |
| extern struct mutex text_mutex; |
| |
| #endif /* _LINUX_MEMORY_H_ */ |