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[PATCH] swsusp: add s2ram ioctl to userland interface

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Add the SNAPSHOT_S2RAM ioctl to the snapshot device.

This ioctl allows a userland application to make the system (previously frozen
with the SNAPSHOT_FREE ioctl) enter the S3 state without freezing processes
and disabling nonboot CPUs for the second time.

This will allow us to implement the suspend-to-disk-and-RAM (STDR)
functionality in the userland suspend tools.

Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Luca Tettamanti 2006-03-23 03:00:09 -08:00 committed by Linus Torvalds
parent 94c188d329
commit 9b238205ba
3 changed files with 40 additions and 2 deletions
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2
kernel/power/main.c
View File

@ -103,7 +103,7 @@ static int suspend_prepare(suspend_state_t state)
}
static int suspend_enter(suspend_state_t state)
int suspend_enter(suspend_state_t state)
{
int error = 0;
unsigned long flags;

4
kernel/power/power.h
View File

@ -77,7 +77,8 @@ int snapshot_image_loaded(struct snapshot_handle *handle);
#define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
#define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
#define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
#define SNAPSHOT_IOC_MAXNR 10
#define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
#define SNAPSHOT_IOC_MAXNR 11
/**
* The bitmap is used for tracing allocated swap pages
@ -112,3 +113,4 @@ extern int swsusp_resume(void);
extern int swsusp_read(void);
extern int swsusp_write(void);
extern void swsusp_close(void);
extern int suspend_enter(suspend_state_t state);

36
kernel/power/user.c
View File

@ -266,6 +266,42 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
}
break;
case SNAPSHOT_S2RAM:
if (!data->frozen) {
error = -EPERM;
break;
}
if (down_trylock(&pm_sem)) {
error = -EBUSY;
break;
}
if (pm_ops->prepare) {
error = pm_ops->prepare(PM_SUSPEND_MEM);
if (error)
goto OutS3;
}
/* Put devices to sleep */
error = device_suspend(PMSG_SUSPEND);
if (error) {
printk(KERN_ERR "Failed to suspend some devices.\n");
} else {
/* Enter S3, system is already frozen */
suspend_enter(PM_SUSPEND_MEM);
/* Wake up devices */
device_resume();
}
if (pm_ops->finish)
pm_ops->finish(PM_SUSPEND_MEM);
OutS3:
up(&pm_sem);
break;
default:
error = -ENOTTY;