153 lines
4.5 KiB
C
153 lines
4.5 KiB
C
/*
|
|
* 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;
|
|
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 sys_device sysdev;
|
|
};
|
|
|
|
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;
|
|
};
|
|
|
|
/*
|
|
* 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_ */
|