From 9b238205ba5d79a8a242d7a5ddb82b89e4dc4e48 Mon Sep 17 00:00:00 2001 From: Luca Tettamanti Date: Thu, 23 Mar 2006 03:00:09 -0800 Subject: [PATCH] swsusp: add s2ram ioctl to userland interface 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 Signed-off-by: Rafael J. Wysocki Cc: Pavel Machek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/power/user.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'kernel/power/user.c') diff --git a/kernel/power/user.c b/kernel/power/user.c index bbd4842104a..3f1539fbe48 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -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; -- cgit v1.2.3