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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.

Signed-off-by: Mario Limonciello <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Mario Limonciello 2018-03-28 12:01:09 -05:00 • committed by Rafael J. Wysocki
commit 355064675f
3 changed files with 47 additions and 1 deletions
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10
Documentation/power/swsusp.txt
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@ -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