root/include/linux/memory.h

INCLUDED FROM

DEFINITIONS

1. memory_dev_init
2. register_memory_notifier
3. unregister_memory_notifier
4. memory_notify

/*
 * 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 <linux/mutex.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 mutex state_mutex;
        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;

/*
 * 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 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_ */