/* * 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/sysdev.h> #include <linux/node.h> #include <linux/compiler.h> #include <asm/semaphore.h> struct memory_block { unsigned long phys_index; unsigned long state; /* * This serializes all state change requests. It isn't * held during creation because the control files are * created long after the critical areas during * initialization. */ struct semaphore state_sem; int phys_device; /* to which fru does this belong? */ void *hw; /* optional pointer to fw/hw data */ int (*phys_callback)(struct memory_block *); struct sys_device sysdev; }; /* 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; }; struct notifier_block; struct mem_section; #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE static inline int memory_dev_init(void) { return 0; } 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); extern int register_new_memory(struct mem_section *); extern int unregister_memory_section(struct mem_section *); extern int memory_dev_init(void); extern int remove_memory_block(unsigned long, struct mem_section *, int); extern int memory_notify(unsigned long val, void *v); #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 struct notifier_block fn##_mem_nb = \ { .notifier_call = fn, .priority = pri }; \ register_memory_notifier(&fn##_mem_nb); \ } #else #define hotplug_memory_notifier(fn, pri) do { } while (0) #endif #endif /* _LINUX_MEMORY_H_ */