projects/linux·commit 9b238205

[PATCH] swsusp: add s2ram ioctl to userland interface

9b238205 · Luca Tettamanti <[email protected]> · 2006-03-23 03:00:09 -08:00

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 <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Cc: Pavel Machek <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Commit
9b238205ba5d79a8a242d7a5ddb82b89e4dc4e48
Parents
94c188d3

Changes

3 files changed · +40 −2

FileStatusAddDelContent
kernel/power/main.cmodified+1−1View file
kernel/power/power.hmodified+3−1View file
kernel/power/user.cmodified+36−0View file

kernel/power/main.c

View file
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 9cb235c..ee371f5 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -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;

kernel/power/power.h

View file
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 42c431c..f06f12f 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -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);

kernel/power/user.c

View file
diff --git a/kernel/power/user.c b/kernel/power/user.c
index bbd4842..3f1539f 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;