[deliverable/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/node.h>
#include <linux/compiler.h>
#include <linux/mutex.h>

#define MIN_MEMORY_BLOCK_SIZE     (1UL << SECTION_SIZE_BITS)

struct memory_block {
	unsigned long start_section_nr;
	unsigned long end_section_nr;
	unsigned long state;
	int section_count;

	/*
	 * 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 device dev;
};

int arch_get_memory_phys_device(unsigned long start_pfn);

/* 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;
};

/*
 * During pageblock isolation, count the number of pages within the
 * range [start_pfn, start_pfn + nr_pages) which are owned by code
 * in the notifier chain.
 */
#define MEM_ISOLATE_COUNT	(1<<0)

struct memory_isolate_notify {
	unsigned long start_pfn;	/* Start of range to check */
	unsigned int nr_pages;		/* # pages in range to check */
	unsigned int pages_found;	/* # pages owned found by callbacks */
};

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;
}
static inline int register_memory_isolate_notifier(struct notifier_block *nb)
{
	return 0;
}
static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
{
}
static inline int memory_isolate_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_memory_isolate_notifier(struct notifier_block *nb);
extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
extern int register_new_memory(int, 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);
extern int memory_isolate_notify(unsigned long val, void *v);
extern struct memory_block *find_memory_block_hinted(struct mem_section *,
							struct memory_block *);
extern struct memory_block *find_memory_block(struct mem_section *);
#define CONFIG_MEM_BLOCK_SIZE	(PAGES_PER_SECTION<<PAGE_SHIFT)
enum mem_add_context { BOOT, HOTPLUG };
#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);			\
}
#else
#define hotplug_memory_notifier(fn, pri) do { } while (0)
#endif

/*
 * 'struct memory_accessor' is a generic interface to provide
 * in-kernel access to persistent memory such as i2c or SPI EEPROMs
 */
struct memory_accessor {
	ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
			size_t count);
	ssize_t (*write)(struct memory_accessor *, const char *buf,
			 off_t offset, size_t count);
};

/*
 * Kernel text modification mutex, used for code patching. Users of this lock
 * can sleep.
 */
extern struct mutex text_mutex;

#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
3947be19 DH	18	#include <linux/node.h>
3947be19 DH	19	#include <linux/compiler.h>
da19cbcf	20	#include <linux/mutex.h>
3947be19	21
05cf9639	22	#define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS)
a63fdc51	23
3947be19	24	struct memory_block {
d3360164 NF	25	unsigned long start_section_nr;
d3360164 NF	26	unsigned long end_section_nr;
3947be19	27	unsigned long state;
07681215 NF	28	int section_count;
07681215 NF	29
3947be19 DH	30	/*
	31	* This serializes all state change requests. It isn't
	32	* held during creation because the control files are
	33	* created long after the critical areas during
	34	* initialization.
	35	*/
da19cbcf	36	struct mutex state_mutex;
3947be19 DH	37	int phys_device; /* to which fru does this belong? */
	38	void hw; / optional pointer to fw/hw data */
	39	int (phys_callback)(struct memory_block );
10fbcf4c	40	struct device dev;
3947be19 DH	41	};
3947be19 DH	42
bc32df00 HC	43	int arch_get_memory_phys_device(unsigned long start_pfn);
bc32df00 HC	44
3947be19 DH	45	/* These states are exposed to userspace as text strings in sysfs */
	46	#define MEM_ONLINE (1<<0) /* exposed to userspace */
	47	#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
	48	#define MEM_OFFLINE (1<<2) /* exposed to userspace */
7b78d335 YG	49	#define MEM_GOING_ONLINE (1<<3)
	50	#define MEM_CANCEL_ONLINE (1<<4)
	51	#define MEM_CANCEL_OFFLINE (1<<5)
3947be19	52
7b78d335 YG	53	struct memory_notify {
	54	unsigned long start_pfn;
	55	unsigned long nr_pages;
d9713679	56	int status_change_nid_normal;
6715ddf9	57	int status_change_nid_high;
7b78d335 YG	58	int status_change_nid;
7b78d335 YG	59	};
3947be19	60
925cc71e RJ	61	/*
	62	* During pageblock isolation, count the number of pages within the
	63	* range [start_pfn, start_pfn + nr_pages) which are owned by code
	64	* in the notifier chain.
	65	*/
	66	#define MEM_ISOLATE_COUNT (1<<0)
	67
	68	struct memory_isolate_notify {
	69	unsigned long start_pfn; /* Start of range to check */
	70	unsigned int nr_pages; /* # pages in range to check */
	71	unsigned int pages_found; /* # pages owned found by callbacks */
	72	};
	73
8c65b4a6 TS	74	struct notifier_block;
	75	struct mem_section;
	76
0c40ba4f ND	77	/*
	78	* Priorities for the hotplug memory callback routines (stored in decreasing
	79	* order in the callback chain)
	80	*/
	81	#define SLAB_CALLBACK_PRI 1
b6b337ad	82	#define IPC_CALLBACK_PRI 10
0c40ba4f	83
53947027	84	#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
3947be19 DH	85	static inline int memory_dev_init(void)
	86	{
	87	return 0;
	88	}
	89	static inline int register_memory_notifier(struct notifier_block *nb)
	90	{
	91	return 0;
	92	}
	93	static inline void unregister_memory_notifier(struct notifier_block *nb)
	94	{
	95	}
7b78d335 YG	96	static inline int memory_notify(unsigned long val, void *v)
	97	{
	98	return 0;
	99	}
925cc71e RJ	100	static inline int register_memory_isolate_notifier(struct notifier_block *nb)
	101	{
	102	return 0;
	103	}
	104	static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
	105	{
	106	}
	107	static inline int memory_isolate_notify(unsigned long val, void *v)
	108	{
	109	return 0;
	110	}
3947be19	111	#else
7b78d335 YG	112	extern int register_memory_notifier(struct notifier_block *nb);
7b78d335 YG	113	extern void unregister_memory_notifier(struct notifier_block *nb);
925cc71e RJ	114	extern int register_memory_isolate_notifier(struct notifier_block *nb);
925cc71e RJ	115	extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
c04fc586	116	extern int register_new_memory(int, struct mem_section *);
3947be19 DH	117	extern int unregister_memory_section(struct mem_section *);
3947be19 DH	118	extern int memory_dev_init(void);
b792de39	119	extern int remove_memory_block(unsigned long, struct mem_section *, int);
7b78d335	120	extern int memory_notify(unsigned long val, void *v);
925cc71e	121	extern int memory_isolate_notify(unsigned long val, void *v);
98383031 RH	122	extern struct memory_block find_memory_block_hinted(struct mem_section ,
98383031 RH	123	struct memory_block *);
c04fc586	124	extern struct memory_block find_memory_block(struct mem_section );
3947be19	125	#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
c04fc586	126	enum mem_add_context { BOOT, HOTPLUG };
53947027	127	#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
3947be19	128
b9049e23	129	#ifdef CONFIG_MEMORY_HOTPLUG
3947be19	130	#define hotplug_memory_notifier(fn, pri) { \
02d0e675	131	static __meminitdata struct notifier_block fn##_mem_nb =\
3947be19 DH	132	{ .notifier_call = fn, .priority = pri }; \
	133	register_memory_notifier(&fn##_mem_nb); \
	134	}
b9049e23 YG	135	#else
	136	#define hotplug_memory_notifier(fn, pri) do { } while (0)
	137	#endif
3947be19	138
06c421ee KH	139	/*
	140	* 'struct memory_accessor' is a generic interface to provide
	141	* in-kernel access to persistent memory such as i2c or SPI EEPROMs
	142	*/
	143	struct memory_accessor {
	144	ssize_t (read)(struct memory_accessor , char *buf, off_t offset,
	145	size_t count);
	146	ssize_t (write)(struct memory_accessor , const char *buf,
	147	off_t offset, size_t count);
	148	};
	149
0e39ac44 MD	150	/*
	151	* Kernel text modification mutex, used for code patching. Users of this lock
	152	* can sleep.
	153	*/
	154	extern struct mutex text_mutex;
	155
3947be19	156	#endif /* _LINUX_MEMORY_H_ */