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PM: Separate hibernation code from suspend code

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[ With Johannes Berg <[email protected]> ]

Separate the hibernation (aka suspend to disk code) from the other suspend
code.  In particular:

 * Remove the definitions related to hibernation from include/linux/pm.h
 * Introduce struct hibernation_ops and a new hibernate() function to hibernate
   the system, defined in include/linux/suspend.h
 * Separate suspend code in kernel/power/main.c from hibernation-related code
   in kernel/power/disk.c and kernel/power/user.c (with the help of
   hibernation_ops)
 * Switch ACPI (the only user of pm_ops.pm_disk_mode) to hibernation_ops

Signed-off-by: Rafael J. Wysocki <[email protected]>
Cc: Greg KH <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: Nigel Cunningham <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2007-05-09 02:33:18 -07:00 • committed by Linus Torvalds
commit a3d25c275d
11 changed files with 226 additions and 185 deletions
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26
Documentation/power/userland-swsusp.txt
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@ -93,21 +93,23 @@ SNAPSHOT_S2RAM - suspend to RAM; using this call causes the kernel to
to resume the system from RAM if there's enough battery power or restore
its state on the basis of the saved suspend image otherwise)
SNAPSHOT_PMOPS - enable the usage of the pmops->prepare, pmops->enter and
pmops->finish methods (the in-kernel swsusp knows these as the "platform
method") which are needed on many machines to (among others) speed up
the resume by letting the BIOS skip some steps or to let the system
recognise the correct state of the hardware after the resume (in
particular on many machines this ensures that unplugged AC
adapters get correctly detected and that kacpid does not run wild after
the resume). The last ioctl() argument can take one of the three
values, defined in kernel/power/power.h:
SNAPSHOT_PMOPS - enable the usage of the hibernation_ops->prepare,
hibernate_ops->enter and hibernation_ops->finish methods (the in-kernel
swsusp knows these as the "platform method") which are needed on many
machines to (among others) speed up the resume by letting the BIOS skip
some steps or to let the system recognise the correct state of the
hardware after the resume (in particular on many machines this ensures
that unplugged AC adapters get correctly detected and that kacpid does
not run wild after the resume). The last ioctl() argument can take one
of the three values, defined in kernel/power/power.h:
PMOPS_PREPARE - make the kernel carry out the
pm_ops->prepare(PM_SUSPEND_DISK) operation
hibernation_ops->prepare() operation
PMOPS_ENTER - make the kernel power off the system by calling
pm_ops->enter(PM_SUSPEND_DISK)
hibernation_ops->enter()
PMOPS_FINISH - make the kernel carry out the
pm_ops->finish(PM_SUSPEND_DISK) operation
hibernation_ops->finish() operation
Note that the actual constants are misnamed because they surface
internal kernel implementation details that have changed.
The device's read() operation can be used to transfer the snapshot image from
the kernel. It has the following limitations: