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Hibernation: Introduce exportable suspend ioctls header (rev. 2)

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Move the definitions of hibernation ioctls to a separate header file in
include/linux, which can be exported to the user space.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki 2007-10-26 01:05:05 +02:00 committed by Len Brown
parent cc5d207c85
commit 3010f8caa4
4 changed files with 39 additions and 33 deletions
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10
Documentation/power/userland-swsusp.txt
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@ -14,7 +14,7 @@ are going to develop your own suspend/resume utilities.
The interface consists of a character device providing the open(),
release(), read(), and write() operations as well as several ioctl()
commands defined in kernel/power/power.h. The major and minor
commands defined in include/linux/suspend_ioctls.h . The major and minor
numbers of the device are, respectively, 10 and 231, and they can
be read from /sys/class/misc/snapshot/dev.
@ -70,10 +70,10 @@ SNAPSHOT_FREE_SWAP_PAGES - free all swap pages allocated by
SNAPSHOT_SET_SWAP_AREA - set the resume partition and the offset (in <PAGE_SIZE>
units) from the beginning of the partition at which the swap header is
located (the last ioctl() argument should point to a struct
resume_swap_area, as defined in kernel/power/power.h, containing the
resume device specification and the offset); for swap partitions the
offset is always 0, but it is different from zero for swap files (see
Documentation/swsusp-and-swap-files.txt for details).
resume_swap_area, as defined in kernel/power/suspend_ioctls.h,
containing the resume device specification and the offset); for swap
partitions the offset is always 0, but it is different from zero for
swap files (see Documentation/swsusp-and-swap-files.txt for details).
SNAPSHOT_PLATFORM_SUPPORT - enable/disable the hibernation platform support,
depending on the argument value (enable, if the argument is nonzero)

1
include/linux/Kbuild
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@ -143,6 +143,7 @@ header-y += snmp.h
header-y += sockios.h
header-y += som.h
header-y += sound.h
header-y += suspend_ioctls.h
header-y += taskstats.h
header-y += telephony.h
header-y += termios.h

32
include/linux/suspend_ioctls.h Normal file
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@ -0,0 +1,32 @@
#ifndef _LINUX_SUSPEND_IOCTLS_H
#define _LINUX_SUSPEND_IOCTLS_H
/*
* This structure is used to pass the values needed for the identification
* of the resume swap area from a user space to the kernel via the
* SNAPSHOT_SET_SWAP_AREA ioctl
*/
struct resume_swap_area {
loff_t offset;
u_int32_t dev;
} __attribute__((packed));
#define SNAPSHOT_IOC_MAGIC '3'
#define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
#define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
#define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
#define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
#define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
#define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
#define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \
struct resume_swap_area)
#define SNAPSHOT_GET_IMAGE_SIZE _IOR(SNAPSHOT_IOC_MAGIC, 14, loff_t)
#define SNAPSHOT_PLATFORM_SUPPORT _IO(SNAPSHOT_IOC_MAGIC, 15)
#define SNAPSHOT_POWER_OFF _IO(SNAPSHOT_IOC_MAGIC, 16)
#define SNAPSHOT_CREATE_IMAGE _IOW(SNAPSHOT_IOC_MAGIC, 17, int)
#define SNAPSHOT_PREF_IMAGE_SIZE _IO(SNAPSHOT_IOC_MAGIC, 18)
#define SNAPSHOT_AVAIL_SWAP_SIZE _IOR(SNAPSHOT_IOC_MAGIC, 19, loff_t)
#define SNAPSHOT_ALLOC_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 20, loff_t)
#define SNAPSHOT_IOC_MAXNR 20
#endif /* _LINUX_SUSPEND_IOCTLS_H */

29
kernel/power/power.h
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@ -1,4 +1,5 @@
#include <linux/suspend.h>
#include <linux/suspend_ioctls.h>
#include <linux/utsname.h>
struct swsusp_info {
@ -134,34 +135,6 @@ extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
extern void snapshot_write_finalize(struct snapshot_handle *handle);
extern int snapshot_image_loaded(struct snapshot_handle *handle);
/*
* This structure is used to pass the values needed for the identification
* of the resume swap area from a user space to the kernel via the
* SNAPSHOT_SET_SWAP_AREA ioctl
*/
struct resume_swap_area {
loff_t offset;
u_int32_t dev;
} __attribute__((packed));
#define SNAPSHOT_IOC_MAGIC '3'
#define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
#define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
#define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
#define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
#define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
#define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
#define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \
struct resume_swap_area)
#define SNAPSHOT_GET_IMAGE_SIZE _IOR(SNAPSHOT_IOC_MAGIC, 14, loff_t)
#define SNAPSHOT_PLATFORM_SUPPORT _IO(SNAPSHOT_IOC_MAGIC, 15)
#define SNAPSHOT_POWER_OFF _IO(SNAPSHOT_IOC_MAGIC, 16)
#define SNAPSHOT_CREATE_IMAGE _IOW(SNAPSHOT_IOC_MAGIC, 17, int)
#define SNAPSHOT_PREF_IMAGE_SIZE _IO(SNAPSHOT_IOC_MAGIC, 18)
#define SNAPSHOT_AVAIL_SWAP_SIZE _IOR(SNAPSHOT_IOC_MAGIC, 19, loff_t)
#define SNAPSHOT_ALLOC_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 20, loff_t)
#define SNAPSHOT_IOC_MAXNR 20
/* If unset, the snapshot device cannot be open. */
extern atomic_t snapshot_device_available;