[linux-2.6-block.git] / include / linux / memory.h

/*
 * 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_ */
Commit	Line	Data
3947be19 DH	1	/*
	2	* include/linux/memory.h - generic memory definition
	3	*
	4	* This is mainly for topological representation. We define the
	5	* basic "struct memory_block" here, which can be embedded in per-arch
	6	* definitions or NUMA information.
	7	*
	8	* Basic handling of the devices is done in drivers/base/memory.c
	9	* and system devices are handled in drivers/base/sys.c.
	10	*
	11	* Memory block are exported via sysfs in the class/memory/devices/
	12	* directory.
	13	*
	14	*/
	15	#ifndef _LINUX_MEMORY_H_
	16	#define _LINUX_MEMORY_H_
	17
	18	#include <linux/sysdev.h>
	19	#include <linux/node.h>
	20	#include <linux/compiler.h>
	21
	22	#include <asm/semaphore.h>
	23
	24	struct memory_block {
	25	unsigned long phys_index;
	26	unsigned long state;
	27	/*
	28	* This serializes all state change requests. It isn't
	29	* held during creation because the control files are
	30	* created long after the critical areas during
	31	* initialization.
	32	*/
	33	struct semaphore state_sem;
	34	int phys_device; /* to which fru does this belong? */
	35	void hw; / optional pointer to fw/hw data */
	36	int (phys_callback)(struct memory_block );
	37	struct sys_device sysdev;
	38	};
	39
	40	/* These states are exposed to userspace as text strings in sysfs */
	41	#define MEM_ONLINE (1<<0) /* exposed to userspace */
	42	#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
	43	#define MEM_OFFLINE (1<<2) /* exposed to userspace */
7b78d335 YG	44	#define MEM_GOING_ONLINE (1<<3)
	45	#define MEM_CANCEL_ONLINE (1<<4)
	46	#define MEM_CANCEL_OFFLINE (1<<5)
3947be19	47
7b78d335 YG	48	struct memory_notify {
	49	unsigned long start_pfn;
	50	unsigned long nr_pages;
	51	int status_change_nid;
	52	};
3947be19	53
8c65b4a6 TS	54	struct notifier_block;
	55	struct mem_section;
	56
53947027	57	#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
3947be19 DH	58	static inline int memory_dev_init(void)
	59	{
	60	return 0;
	61	}
	62	static inline int register_memory_notifier(struct notifier_block *nb)
	63	{
	64	return 0;
	65	}
	66	static inline void unregister_memory_notifier(struct notifier_block *nb)
	67	{
	68	}
7b78d335 YG	69	static inline int memory_notify(unsigned long val, void *v)
	70	{
	71	return 0;
	72	}
3947be19	73	#else
7b78d335 YG	74	extern int register_memory_notifier(struct notifier_block *nb);
7b78d335 YG	75	extern void unregister_memory_notifier(struct notifier_block *nb);
3947be19 DH	76	extern int register_new_memory(struct mem_section *);
	77	extern int unregister_memory_section(struct mem_section *);
	78	extern int memory_dev_init(void);
b792de39	79	extern int remove_memory_block(unsigned long, struct mem_section *, int);
7b78d335	80	extern int memory_notify(unsigned long val, void *v);
3947be19 DH	81	#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
3947be19 DH	82
3947be19	83
53947027	84	#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
3947be19	85
b9049e23	86	#ifdef CONFIG_MEMORY_HOTPLUG
3947be19 DH	87	#define hotplug_memory_notifier(fn, pri) { \
	88	static struct notifier_block fn##_mem_nb = \
	89	{ .notifier_call = fn, .priority = pri }; \
	90	register_memory_notifier(&fn##_mem_nb); \
	91	}
b9049e23 YG	92	#else
	93	#define hotplug_memory_notifier(fn, pri) do { } while (0)
	94	#endif
3947be19 DH	95
3947be19 DH	96	#endif /* _LINUX_MEMORY_H_ */