[linux.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 */

/*
 * All of these states are currently kernel-internal for notifying
 * kernel components and architectures.
 *
 * For MEM_MAPPING_INVALID, all notifier chains with priority >0
 * are called before pfn_to_page() becomes invalid.  The priority=0
 * entry is reserved for the function that actually makes
 * pfn_to_page() stop working.  Any notifiers that want to be called
 * after that should have priority <0.
 */
#define	MEM_MAPPING_INVALID	(1<<3)

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)
{
}
#else
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);

#define CONFIG_MEM_BLOCK_SIZE	(PAGES_PER_SECTION<<PAGE_SHIFT)


#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */

#define hotplug_memory_notifier(fn, pri) {			\
	static struct notifier_block fn##_mem_nb =		\
		{ .notifier_call = fn, .priority = pri };	\
	register_memory_notifier(&fn##_mem_nb);			\
}

#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 */
	44
	45	/*
	46	* All of these states are currently kernel-internal for notifying
	47	* kernel components and architectures.
	48	*
	49	* For MEM_MAPPING_INVALID, all notifier chains with priority >0
	50	* are called before pfn_to_page() becomes invalid. The priority=0
	51	* entry is reserved for the function that actually makes
	52	* pfn_to_page() stop working. Any notifiers that want to be called
	53	* after that should have priority <0.
	54	*/
	55	#define MEM_MAPPING_INVALID (1<<3)
	56
8c65b4a6 TS	57	struct notifier_block;
	58	struct mem_section;
	59
53947027	60	#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
3947be19 DH	61	static inline int memory_dev_init(void)
	62	{
	63	return 0;
	64	}
	65	static inline int register_memory_notifier(struct notifier_block *nb)
	66	{
	67	return 0;
	68	}
	69	static inline void unregister_memory_notifier(struct notifier_block *nb)
	70	{
	71	}
	72	#else
3947be19 DH	73	extern int register_new_memory(struct mem_section *);
	74	extern int unregister_memory_section(struct mem_section *);
	75	extern int memory_dev_init(void);
b792de39	76	extern int remove_memory_block(unsigned long, struct mem_section *, int);
3947be19 DH	77
	78	#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
	79
3947be19	80
53947027	81	#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
3947be19 DH	82
	83	#define hotplug_memory_notifier(fn, pri) { \
	84	static struct notifier_block fn##_mem_nb = \
	85	{ .notifier_call = fn, .priority = pri }; \
	86	register_memory_notifier(&fn##_mem_nb); \
	87	}
	88
	89	#endif /* _LINUX_MEMORY_H_ */