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Commit 6f8581ef authored by Mario Limonciello's avatar Mario Limonciello Committed by Yimin Peng
Browse files

PM / hibernate: Make passing hibernate offsets more friendly 



Currently the only way to specify a hibernate offset for a
swap file is on the kernel command line.

Add a new /sys/power/resume_offset that lets userspace
specify the offset and disk to use when initiating a hibernate
cycle.

Change-Id: Ied0be8062e6677e44acbfcb8cbf235e6bb8cf2ef
Signed-off-by: default avatarMario Limonciello <mario.limonciello@dell.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Git-commit: 35506467
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: default avatarYimin Peng <yiminp@codeaurora.org>
parent 39641649

Documentation/power/swsusp.txt

+9 −1
Original line number Diff line number Diff line
@@ -24,8 +24,16 @@ Some warnings, first. 
 * see the FAQ below for details.  (This is not true for more traditional

 * power states like "standby", which normally don't turn USB off.)



Swap partition:

You need to append resume=/dev/your_swap_partition to kernel command

line. Then you suspend by

line or specify it using /sys/power/resume.



Swap file:

If using a swapfile you can also specify a resume offset using

resume_offset=<number> on the kernel command line or specify it

in /sys/power/resume_offset.



After preparing then you suspend by



echo shutdown > /sys/power/disk; echo disk > /sys/power/state

kernel/power/hibernate.c

+24 −0
Original line number Diff line number Diff line
@@ -1076,6 +1076,29 @@ static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, 


power_attr(resume);



static ssize_t resume_offset_show(struct kobject *kobj,

				  struct kobj_attribute *attr, char *buf)

{

	return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);

}



static ssize_t resume_offset_store(struct kobject *kobj,

				   struct kobj_attribute *attr, const char *buf,

				   size_t n)

{

	unsigned long long offset;

	int rc;



	rc = kstrtoull(buf, 0, &offset);

	if (rc)

		return rc;

	swsusp_resume_block = offset;



	return n;

}



power_attr(resume_offset);



static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,

			       char *buf)

{
@@ -1121,6 +1144,7 @@ power_attr(reserved_size); 


static struct attribute * g[] = {

	&disk_attr.attr,

	&resume_offset_attr.attr,

	&resume_attr.attr,

	&image_size_attr.attr,

	&reserved_size_attr.attr,