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PM / hibernate: Make passing hibernate offsets more friendly

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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: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Git-commit: 355064675f1c997cea017ea64c8f2c216e5425d9
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Yimin Peng <yiminp@codeaurora.org>
This commit is contained in:
Mario Limonciello 2020-05-08 11:55:31 +08:00 committed by Yimin Peng
parent 3964164902
commit 6f8581efba
2 changed files with 33 additions and 1 deletions
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10
Documentation/power/swsusp.txt
View File

@ -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

24
kernel/power/hibernate.c
View File

@ -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,