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Merge branch 'suspend' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6

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* 'suspend' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (38 commits)
  suspend: cleanup reference to swsusp_pg_dir[]
  PM: Remove obsolete /sys/devices/.../power/state docs
  Hibernation: Invoke suspend notifications after console switch
  Suspend: Invoke suspend notifications after console switch
  Suspend: Clean up suspend_64.c
  Suspend: Add config option to disable the freezer if architecture wants that
  ACPI: Print message before calling _PTS
  ACPI hibernation: Call _PTS before suspending devices
  Hibernation: Introduce begin() and end() callbacks
  ACPI suspend: Call _PTS before suspending devices
  ACPI: Separate disabling of GPEs from _PTS
  ACPI: Separate invocations of _GTS and _BFS from _PTS and _WAK
  Suspend: Introduce begin() and end() callbacks
  suspend: fix ia64 allmodconfig build
  ACPI: clear GPE earily in resume to avoid warning
  Suspend: Clean up Kconfig (V2)
  Hibernation: Clean up Kconfig (V2)
  Hibernation: Update messages
  Suspend: Use common prefix in messages
  Hibernation: Remove unnecessary variable declaration
  ...
This commit is contained in:
Linus Torvalds 2008-02-02 14:29:57 +11:00
commit 687fcdf741
34 changed files with 1032 additions and 505 deletions
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5
Documentation/kernel-parameters.txt
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@ -168,6 +168,11 @@ and is between 256 and 4096 characters. It is defined in the file
acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA
Format: <irq>,<irq>...
acpi_new_pts_ordering [HW,ACPI]
Enforce the ACPI 2.0 ordering of the _PTS control
method wrt putting devices into low power states
default: pre ACPI 2.0 ordering of _PTS
acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT
acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS

212
Documentation/power/basic-pm-debugging.txt
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@ -1,45 +1,111 @@
Debugging suspend and resume
Debugging hibernation and suspend
(C) 2007 Rafael J. Wysocki <rjw@sisk.pl>, GPL
1. Testing suspend to disk (STD)
1. Testing hibernation (aka suspend to disk or STD)
To verify that the STD works, you can try to suspend in the "reboot" mode:
To check if hibernation works, you can try to hibernate in the "reboot" mode:
# echo reboot > /sys/power/disk
# echo disk > /sys/power/state
and the system should suspend, reboot, resume and get back to the command prompt
where you have started the transition. If that happens, the STD is most likely
to work correctly, but you need to repeat the test at least a couple of times in
a row for confidence. This is necessary, because some problems only show up on
a second attempt at suspending and resuming the system. You should also test
the "platform" and "shutdown" modes of suspend:
and the system should create a hibernation image, reboot, resume and get back to
the command prompt where you have started the transition. If that happens,
hibernation is most likely to work correctly. Still, you need to repeat the
test at least a couple of times in a row for confidence. [This is necessary,
because some problems only show up on a second attempt at suspending and
resuming the system.] Moreover, hibernating in the "reboot" and "shutdown"
modes causes the PM core to skip some platform-related callbacks which on ACPI
systems might be necessary to make hibernation work. Thus, if you machine fails
to hibernate or resume in the "reboot" mode, you should try the "platform" mode:
# echo platform > /sys/power/disk
# echo disk > /sys/power/state
or
which is the default and recommended mode of hibernation.
Unfortunately, the "platform" mode of hibernation does not work on some systems
with broken BIOSes. In such cases the "shutdown" mode of hibernation might
work:
# echo shutdown > /sys/power/disk
# echo disk > /sys/power/state
in which cases you will have to press the power button to make the system
resume. If that does not work, you will need to identify what goes wrong.
(it is similar to the "reboot" mode, but it requires you to press the power
button to make the system resume).
a) Test mode of STD
If neither "platform" nor "shutdown" hibernation mode works, you will need to
identify what goes wrong.
To verify if there are any drivers that cause problems you can run the STD
in the test mode:
a) Test modes of hibernation
# echo test > /sys/power/disk
To find out why hibernation fails on your system, you can use a special testing
facility available if the kernel is compiled with CONFIG_PM_DEBUG set. Then,
there is the file /sys/power/pm_test that can be used to make the hibernation
core run in a test mode. There are 5 test modes available:
freezer
- test the freezing of processes
devices
- test the freezing of processes and suspending of devices
platform
- test the freezing of processes, suspending of devices and platform
global control methods(*)
processors
- test the freezing of processes, suspending of devices, platform
global control methods(*) and the disabling of nonboot CPUs
core
- test the freezing of processes, suspending of devices, platform global
control methods(*), the disabling of nonboot CPUs and suspending of
platform/system devices
(*) the platform global control methods are only available on ACPI systems
and are only tested if the hibernation mode is set to "platform"
To use one of them it is necessary to write the corresponding string to
/sys/power/pm_test (eg. "devices" to test the freezing of processes and
suspending devices) and issue the standard hibernation commands. For example,
to use the "devices" test mode along with the "platform" mode of hibernation,
you should do the following:
# echo devices > /sys/power/pm_test
# echo platform > /sys/power/disk
# echo disk > /sys/power/state
in which case the system should freeze tasks, suspend devices, disable nonboot
CPUs (if any), wait for 5 seconds, enable nonboot CPUs, resume devices, thaw
tasks and return to your command prompt. If that fails, most likely there is
a driver that fails to either suspend or resume (in the latter case the system
may hang or be unstable after the test, so please take that into consideration).
To find this driver, you can carry out a binary search according to the rules:
Then, the kernel will try to freeze processes, suspend devices, wait 5 seconds,
resume devices and thaw processes. If "platform" is written to
/sys/power/pm_test , then after suspending devices the kernel will additionally
invoke the global control methods (eg. ACPI global control methods) used to
prepare the platform firmware for hibernation. Next, it will wait 5 seconds and
invoke the platform (eg. ACPI) global methods used to cancel hibernation etc.
Writing "none" to /sys/power/pm_test causes the kernel to switch to the normal
hibernation/suspend operations. Also, when open for reading, /sys/power/pm_test
contains a space-separated list of all available tests (including "none" that
represents the normal functionality) in which the current test level is
indicated by square brackets.
Generally, as you can see, each test level is more "invasive" than the previous
one and the "core" level tests the hardware and drivers as deeply as possible
without creating a hibernation image. Obviously, if the "devices" test fails,
the "platform" test will fail as well and so on. Thus, as a rule of thumb, you
should try the test modes starting from "freezer", through "devices", "platform"
and "processors" up to "core" (repeat the test on each level a couple of times
to make sure that any random factors are avoided).
If the "freezer" test fails, there is a task that cannot be frozen (in that case
it usually is possible to identify the offending task by analysing the output of
dmesg obtained after the failing test). Failure at this level usually means
that there is a problem with the tasks freezer subsystem that should be
reported.
If the "devices" test fails, most likely there is a driver that cannot suspend
or resume its device (in the latter case the system may hang or become unstable
after the test, so please take that into consideration). To find this driver,
you can carry out a binary search according to the rules:
- if the test fails, unload a half of the drivers currently loaded and repeat
(that would probably involve rebooting the system, so always note what drivers
have been loaded before the test),
@ -47,23 +113,46 @@ have been loaded before the test),
recently and repeat.
Once you have found the failing driver (there can be more than just one of
them), you have to unload it every time before the STD transition. In that case
please make sure to report the problem with the driver.
them), you have to unload it every time before hibernation. In that case please
make sure to report the problem with the driver.
It is also possible that a cycle can still fail after you have unloaded
all modules. In that case, you would want to look in your kernel configuration
for the drivers that can be compiled as modules (testing again with them as
modules), and possibly also try boot time options such as "noapic" or "noacpi".
It is also possible that the "devices" test will still fail after you have
unloaded all modules. In that case, you may want to look in your kernel
configuration for the drivers that can be compiled as modules (and test again
with these drivers compiled as modules). You may also try to use some special
kernel command line options such as "noapic", "noacpi" or even "acpi=off".
If the "platform" test fails, there is a problem with the handling of the
platform (eg. ACPI) firmware on your system. In that case the "platform" mode
of hibernation is not likely to work. You can try the "shutdown" mode, but that
is rather a poor man's workaround.
If the "processors" test fails, the disabling/enabling of nonboot CPUs does not
work (of course, this only may be an issue on SMP systems) and the problem
should be reported. In that case you can also try to switch the nonboot CPUs
off and on using the /sys/devices/system/cpu/cpu*/online sysfs attributes and
see if that works.
If the "core" test fails, which means that suspending of the system/platform
devices has failed (these devices are suspended on one CPU with interrupts off),
the problem is most probably hardware-related and serious, so it should be
reported.
A failure of any of the "platform", "processors" or "core" tests may cause your
system to hang or become unstable, so please beware. Such a failure usually
indicates a serious problem that very well may be related to the hardware, but
please report it anyway.
b) Testing minimal configuration
If the test mode of STD works, you can boot the system with "init=/bin/bash"
and attempt to suspend in the "reboot", "shutdown" and "platform" modes. If
that does not work, there probably is a problem with a driver statically
compiled into the kernel and you can try to compile more drivers as modules,
so that they can be tested individually. Otherwise, there is a problem with a
modular driver and you can find it by loading a half of the modules you normally
use and binary searching in accordance with the algorithm:
If all of the hibernation test modes work, you can boot the system with the
"init=/bin/bash" command line parameter and attempt to hibernate in the
"reboot", "shutdown" and "platform" modes. If that does not work, there
probably is a problem with a driver statically compiled into the kernel and you
can try to compile more drivers as modules, so that they can be tested
individually. Otherwise, there is a problem with a modular driver and you can
find it by loading a half of the modules you normally use and binary searching
in accordance with the algorithm:
- if there are n modules loaded and the attempt to suspend and resume fails,
unload n/2 of the modules and try again (that would probably involve rebooting
the system),
@ -71,19 +160,19 @@ the system),
load n/2 modules more and try again.
Again, if you find the offending module(s), it(they) must be unloaded every time
before the STD transition, and please report the problem with it(them).
before hibernation, and please report the problem with it(them).
c) Advanced debugging
In case the STD does not work on your system even in the minimal configuration
and compiling more drivers as modules is not practical or some modules cannot
be unloaded, you can use one of the more advanced debugging techniques to find
the problem. First, if there is a serial port in your box, you can boot the
kernel with the 'no_console_suspend' parameter and try to log kernel
messages using the serial console. This may provide you with some information
about the reasons of the suspend (resume) failure. Alternatively, it may be
possible to use a FireWire port for debugging with firescope
(ftp://ftp.firstfloor.org/pub/ak/firescope/). On i386 it is also possible to
In case that hibernation does not work on your system even in the minimal
configuration and compiling more drivers as modules is not practical or some
modules cannot be unloaded, you can use one of the more advanced debugging
techniques to find the problem. First, if there is a serial port in your box,
you can boot the kernel with the 'no_console_suspend' parameter and try to log
kernel messages using the serial console. This may provide you with some
information about the reasons of the suspend (resume) failure. Alternatively,
it may be possible to use a FireWire port for debugging with firescope
(ftp://ftp.firstfloor.org/pub/ak/firescope/). On x86 it is also possible to
use the PM_TRACE mechanism documented in Documentation/s2ram.txt .
2. Testing suspend to RAM (STR)
@ -91,16 +180,25 @@ use the PM_TRACE mechanism documented in Documentation/s2ram.txt .
To verify that the STR works, it is generally more convenient to use the s2ram
tool available from http://suspend.sf.net and documented at
http://en.opensuse.org/s2ram . However, before doing that it is recommended to
carry out the procedure described in section 1.
carry out STR testing using the facility described in section 1.
Assume you have resolved the problems with the STD and you have found some
failing drivers. These drivers are also likely to fail during the STR or
during the resume, so it is better to unload them every time before the STR
transition. Now, you can follow the instructions at
http://en.opensuse.org/s2ram to test the system, but if it does not work
"out of the box", you may need to boot it with "init=/bin/bash" and test
s2ram in the minimal configuration. In that case, you may be able to search
for failing drivers by following the procedure analogous to the one described in
1b). If you find some failing drivers, you will have to unload them every time
before the STR transition (ie. before you run s2ram), and please report the
problems with them.
Namely, after writing "freezer", "devices", "platform", "processors", or "core"
into /sys/power/pm_test (available if the kernel is compiled with
CONFIG_PM_DEBUG set) the suspend code will work in the test mode corresponding
to given string. The STR test modes are defined in the same way as for
hibernation, so please refer to Section 1 for more information about them. In
particular, the "core" test allows you to test everything except for the actual
invocation of the platform firmware in order to put the system into the sleep
state.
Among other things, the testing with the help of /sys/power/pm_test may allow
you to identify drivers that fail to suspend or resume their devices. They
should be unloaded every time before an STR transition.
Next, you can follow the instructions at http://en.opensuse.org/s2ram to test
the system, but if it does not work "out of the box", you may need to boot it
with "init=/bin/bash" and test s2ram in the minimal configuration. In that
case, you may be able to search for failing drivers by following the procedure
analogous to the one described in section 1. If you find some failing drivers,
you will have to unload them every time before an STR transition (ie. before
you run s2ram), and please report the problems with them.

49
Documentation/power/devices.txt
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@ -502,52 +502,3 @@ If the CPU can have a "cpufreq" driver, there also may be opportunities
to shift to lower voltage settings and reduce the power cost of executing
a given number of instructions. (Without voltage adjustment, it's rare
for cpufreq to save much power; the cost-per-instruction must go down.)
/sys/devices/.../power/state files
==================================
For now you can also test some of this functionality using sysfs.
DEPRECATED: USE "power/state" ONLY FOR DRIVER TESTING, AND
AVOID USING dev->power.power_state IN DRIVERS.
THESE WILL BE REMOVED. IF THE "power/state" FILE GETS REPLACED,
IT WILL BECOME SOMETHING COUPLED TO THE BUS OR DRIVER.
In each device's directory, there is a 'power' directory, which contains
at least a 'state' file. The value of this field is effectively boolean,
PM_EVENT_ON or PM_EVENT_SUSPEND.
* Reading from this file displays a value corresponding to
the power.power_state.event field. All nonzero values are
displayed as "2", corresponding to a low power state; zero
is displayed as "0", corresponding to normal operation.
* Writing to this file initiates a transition using the
specified event code number; only '0', '2', and '3' are
accepted (without a newline); '2' and '3' are both
mapped to PM_EVENT_SUSPEND.
On writes, the PM core relies on that recorded event code and the device/bus
capabilities to determine whether it uses a partial suspend() or resume()
sequence to change things so that the recorded event corresponds to the
numeric parameter.
- If the bus requires the irqs-disabled suspend_late()/resume_early()
phases, writes fail because those operations are not supported here.
- If the recorded value is the expected value, nothing is done.
- If the recorded value is nonzero, the device is partially resumed,
using the bus.resume() and/or class.resume() methods.
- If the target value is nonzero, the device is partially suspended,
using the class.suspend() and/or bus.suspend() methods and the
PM_EVENT_SUSPEND message.
Drivers have no way to tell whether their suspend() and resume() calls
have come through the sysfs power/state file or as part of entering a
system sleep state, except that when accessed through sysfs the normal
parent/child sequencing rules are ignored. Drivers (such as bus, bridge,
or hub drivers) which expose child devices may need to enforce those rules
on their own.

30
Documentation/power/drivers-testing.txt
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@ -6,9 +6,9 @@ Testing suspend and resume support in device drivers
Unfortunately, to effectively test the support for the system-wide suspend and
resume transitions in a driver, it is necessary to suspend and resume a fully
functional system with this driver loaded. Moreover, that should be done
several times, preferably several times in a row, and separately for the suspend
to disk (STD) and the suspend to RAM (STR) transitions, because each of these
cases involves different ordering of operations and different interactions with
several times, preferably several times in a row, and separately for hibernation
(aka suspend to disk or STD) and suspend to RAM (STR), because each of these
cases involves slightly different operations and different interactions with
the machine's BIOS.
Of course, for this purpose the test system has to be known to suspend and
@ -22,20 +22,24 @@ for more information about the debugging of suspend/resume functionality.
Once you have resolved the suspend/resume-related problems with your test system
without the new driver, you are ready to test it:
a) Build the driver as a module, load it and try the STD in the test mode (see:
Documents/power/basic-pm-debugging.txt, 1a)).
a) Build the driver as a module, load it and try the test modes of hibernation
(see: Documents/power/basic-pm-debugging.txt, 1).
b) Load the driver and attempt to suspend to disk in the "reboot", "shutdown"
and "platform" modes (see: Documents/power/basic-pm-debugging.txt, 1).
b) Load the driver and attempt to hibernate in the "reboot", "shutdown" and
"platform" modes (see: Documents/power/basic-pm-debugging.txt, 1).
c) Compile the driver directly into the kernel and try the STD in the test mode.
c) Compile the driver directly into the kernel and try the test modes of
hibernation.
d) Attempt to suspend to disk with the driver compiled directly into the kernel
in the "reboot", "shutdown" and "platform" modes.
d) Attempt to hibernate with the driver compiled directly into the kernel
in the "reboot", "shutdown" and "platform" modes.
e) Attempt to suspend to RAM using the s2ram tool with the driver loaded (see:
Documents/power/basic-pm-debugging.txt, 2). As far as the STR tests are
concerned, it should not matter whether or not the driver is built as a module.
e) Try the test modes of suspend (see: Documents/power/basic-pm-debugging.txt,
2). [As far as the STR tests are concerned, it should not matter whether or
not the driver is built as a module.]
f) Attempt to suspend to RAM using the s2ram tool with the driver loaded
(see: Documents/power/basic-pm-debugging.txt, 2).
Each of the above tests should be repeated several times and the STD tests
should be mixed with the STR tests. If any of them fails, the driver cannot be

8
Documentation/power/notifiers.txt
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@ -28,6 +28,14 @@ PM_POST_HIBERNATION The system memory state has been restored from a
hibernation. Device drivers' .resume() callbacks have
been executed and tasks have been thawed.
PM_RESTORE_PREPARE The system is going to restore a hibernation image.
If all goes well the restored kernel will issue a
PM_POST_HIBERNATION notification.
PM_POST_RESTORE An error occurred during the hibernation restore.
Device drivers' .resume() callbacks have been executed
and tasks have been thawed.
PM_SUSPEND_PREPARE The system is preparing for a suspend.
PM_POST_SUSPEND The system has just resumed or an error occured during

82
Documentation/power/userland-swsusp.txt
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@ -14,7 +14,7 @@ are going to develop your own suspend/resume utilities.
The interface consists of a character device providing the open(),
release(), read(), and write() operations as well as several ioctl()
commands defined in kernel/power/power.h. The major and minor
commands defined in include/linux/suspend_ioctls.h . The major and minor
numbers of the device are, respectively, 10 and 231, and they can
be read from /sys/class/misc/snapshot/dev.
@ -27,17 +27,17 @@ once at a time.
The ioctl() commands recognized by the device are:
SNAPSHOT_FREEZE - freeze user space processes (the current process is
not frozen); this is required for SNAPSHOT_ATOMIC_SNAPSHOT
not frozen); this is required for SNAPSHOT_CREATE_IMAGE
and SNAPSHOT_ATOMIC_RESTORE to succeed
SNAPSHOT_UNFREEZE - thaw user space processes frozen by SNAPSHOT_FREEZE
SNAPSHOT_ATOMIC_SNAPSHOT - create a snapshot of the system memory; the
SNAPSHOT_CREATE_IMAGE - create a snapshot of the system memory; the
last argument of ioctl() should be a pointer to an int variable,
the value of which will indicate whether the call returned after
creating the snapshot (1) or after restoring the system memory state
from it (0) (after resume the system finds itself finishing the
SNAPSHOT_ATOMIC_SNAPSHOT ioctl() again); after the snapshot
SNAPSHOT_CREATE_IMAGE ioctl() again); after the snapshot
has been created the read() operation can be used to transfer
it out of the kernel
@ -49,39 +49,37 @@ SNAPSHOT_ATOMIC_RESTORE - restore the system memory state from the
SNAPSHOT_FREE - free memory allocated for the snapshot image
SNAPSHOT_SET_IMAGE_SIZE - set the preferred maximum size of the image
SNAPSHOT_PREF_IMAGE_SIZE - set the preferred maximum size of the image
(the kernel will do its best to ensure the image size will not exceed
this number, but if it turns out to be impossible, the kernel will
create the smallest image possible)
SNAPSHOT_AVAIL_SWAP - return the amount of available swap in bytes (the last
argument should be a pointer to an unsigned int variable that will
SNAPSHOT_GET_IMAGE_SIZE - return the actual size of the hibernation image
SNAPSHOT_AVAIL_SWAP_SIZE - return the amount of available swap in bytes (the
last argument should be a pointer to an unsigned int variable that will
contain the result if the call is successful).
SNAPSHOT_GET_SWAP_PAGE - allocate a swap page from the resume partition
SNAPSHOT_ALLOC_SWAP_PAGE - allocate a swap page from the resume partition
(the last argument should be a pointer to a loff_t variable that
will contain the swap page offset if the call is successful)
SNAPSHOT_FREE_SWAP_PAGES - free all swap pages allocated with
SNAPSHOT_GET_SWAP_PAGE
SNAPSHOT_SET_SWAP_FILE - set the resume partition (the last ioctl() argument
should specify the device's major and minor numbers in the old
two-byte format, as returned by the stat() function in the .st_rdev
member of the stat structure)
SNAPSHOT_FREE_SWAP_PAGES - free all swap pages allocated by
SNAPSHOT_ALLOC_SWAP_PAGE
SNAPSHOT_SET_SWAP_AREA - set the resume partition and the offset (in <PAGE_SIZE>
units) from the beginning of the partition at which the swap header is
located (the last ioctl() argument should point to a struct
resume_swap_area, as defined in kernel/power/power.h, containing the
resume device specification, as for the SNAPSHOT_SET_SWAP_FILE ioctl(),
and the offset); for swap partitions the offset is always 0, but it is
different to zero for swap files (please see
Documentation/swsusp-and-swap-files.txt for details).
The SNAPSHOT_SET_SWAP_AREA ioctl() is considered as a replacement for
SNAPSHOT_SET_SWAP_FILE which is regarded as obsolete. It is
recommended to always use this call, because the code to set the resume
partition may be removed from future kernels
resume_swap_area, as defined in kernel/power/suspend_ioctls.h,
containing the resume device specification and the offset); for swap
partitions the offset is always 0, but it is different from zero for
swap files (see Documentation/swsusp-and-swap-files.txt for details).
SNAPSHOT_PLATFORM_SUPPORT - enable/disable the hibernation platform support,
depending on the argument value (enable, if the argument is nonzero)
SNAPSHOT_POWER_OFF - make the kernel transition the system to the hibernation
state (eg. ACPI S4) using the platform (eg. ACPI) driver
SNAPSHOT_S2RAM - suspend to RAM; using this call causes the kernel to
immediately enter the suspend-to-RAM state, so this call must always
@ -93,24 +91,6 @@ 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 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
hibernation_ops->prepare() operation
PMOPS_ENTER - make the kernel power off the system by calling
hibernation_ops->enter()
PMOPS_FINISH - make the kernel carry out the
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:
- you cannot read() more than one virtual memory page at a time
@ -122,7 +102,7 @@ The device's write() operation is used for uploading the system memory snapshot
into the kernel. It has the same limitations as the read() operation.
The release() operation frees all memory allocated for the snapshot image
and all swap pages allocated with SNAPSHOT_GET_SWAP_PAGE (if any).
and all swap pages allocated with SNAPSHOT_ALLOC_SWAP_PAGE (if any).
Thus it is not necessary to use either SNAPSHOT_FREE or
SNAPSHOT_FREE_SWAP_PAGES before closing the device (in fact it will also
unfreeze user space processes frozen by SNAPSHOT_UNFREEZE if they are
@ -133,16 +113,12 @@ snapshot image from/to the kernel will use a swap parition, called the resume
partition, or a swap file as storage space (if a swap file is used, the resume
partition is the partition that holds this file). However, this is not really
required, as they can use, for example, a special (blank) suspend partition or
a file on a partition that is unmounted before SNAPSHOT_ATOMIC_SNAPSHOT and
a file on a partition that is unmounted before SNAPSHOT_CREATE_IMAGE and
mounted afterwards.
These utilities SHOULD NOT make any assumptions regarding the ordering of
data within the snapshot image, except for the image header that MAY be
assumed to start with an swsusp_info structure, as specified in
kernel/power/power.h. This structure MAY be used by the userland utilities
to obtain some information about the snapshot image, such as the size
of the snapshot image, including the metadata and the header itself,
contained in the .size member of swsusp_info.
These utilities MUST NOT make any assumptions regarding the ordering of
data within the snapshot image. The contents of the image are entirely owned
by the kernel and its structure may be changed in future kernel releases.
The snapshot image MUST be written to the kernel unaltered (ie. all of the image
data, metadata and header MUST be written in _exactly_ the same amount, form
@ -159,7 +135,7 @@ means, such as checksums, to ensure the integrity of the snapshot image.
The suspending and resuming utilities MUST lock themselves in memory,
preferrably using mlockall(), before calling SNAPSHOT_FREEZE.
The suspending utility MUST check the value stored by SNAPSHOT_ATOMIC_SNAPSHOT
The suspending utility MUST check the value stored by SNAPSHOT_CREATE_IMAGE
in the memory location pointed to by the last argument of ioctl() and proceed
in accordance with it:
1. If the value is 1 (ie. the system memory snapshot has just been
@ -173,7 +149,7 @@ in accordance with it:
image has been saved.
(b) The suspending utility SHOULD NOT attempt to perform any
file system operations (including reads) on the file systems
that were mounted before SNAPSHOT_ATOMIC_SNAPSHOT has been
that were mounted before SNAPSHOT_CREATE_IMAGE has been
called. However, it MAY mount a file system that was not
mounted at that time and perform some operations on it (eg.
use it for saving the image).

3
arch/arm/Kconfig
View File

@ -1030,6 +1030,9 @@ menu "Power management options"
source "kernel/power/Kconfig"
config ARCH_SUSPEND_POSSIBLE
def_bool y
endmenu
source "net/Kconfig"

17
arch/arm/mach-at91/pm.c
View File

@ -52,7 +52,7 @@ static suspend_state_t target_state;
/*
* Called after processes are frozen, but before we shutdown devices.
*/
static int at91_pm_set_target(suspend_state_t state)
static int at91_pm_begin(suspend_state_t state)
{
target_state = state;
return 0;
@ -202,11 +202,20 @@ static int at91_pm_enter(suspend_state_t state)
return 0;
}
/*
* Called right prior to thawing processes.
*/
static void at91_pm_end(void)
{
target_state = PM_SUSPEND_ON;
}
static struct platform_suspend_ops at91_pm_ops ={
.valid = at91_pm_valid_state,
.set_target = at91_pm_set_target,
.enter = at91_pm_enter,
.valid = at91_pm_valid_state,
.begin = at91_pm_begin,
.enter = at91_pm_enter,
.end = at91_pm_end,
};
static int __init at91_pm_init(void)

4
arch/blackfin/Kconfig
View File

@ -898,6 +898,10 @@ endmenu
menu "Power management options"
source "kernel/power/Kconfig"
config ARCH_SUSPEND_POSSIBLE
def_bool y
depends on !SMP
choice
prompt "Select PM Wakeup Event Source"
default PM_WAKEUP_GPIO_BY_SIC_IWR

5
arch/frv/Kconfig
View File

@ -352,6 +352,11 @@ source "drivers/pcmcia/Kconfig"
# should probably wait a while.
menu "Power management options"
config ARCH_SUSPEND_POSSIBLE
def_bool y
depends on !SMP
source kernel/power/Kconfig
endmenu

4
arch/mips/Kconfig
View File

@ -2081,6 +2081,10 @@ endmenu
menu "Power management options"
config ARCH_SUSPEND_POSSIBLE
def_bool y
depends on !SMP
source "kernel/power/Kconfig"
endmenu

22
arch/powerpc/Kconfig
View File

@ -151,11 +151,25 @@ config DEFAULT_UIMAGE
config REDBOOT
bool
config PPC64_SWSUSP
config HIBERNATE_32
bool
depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
depends on (PPC_PMAC && !SMP) || BROKEN
default y
config HIBERNATE_64
bool
depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
default y
config ARCH_HIBERNATION_POSSIBLE
bool
depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
default y
config ARCH_SUSPEND_POSSIBLE
def_bool y
depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
config PPC_DCR_NATIVE
bool
default n
@ -391,6 +405,10 @@ config CMDLINE
most cases you will need to specify the root device here.
if !44x || BROKEN
config ARCH_WANTS_FREEZER_CONTROL
def_bool y
depends on ADB_PMU
source kernel/power/Kconfig
endif

10
arch/powerpc/platforms/52xx/lite5200_pm.c
View File

@ -31,7 +31,7 @@ static int lite5200_pm_valid(suspend_state_t state)
}
}
static int lite5200_pm_set_target(suspend_state_t state)
static int lite5200_pm_begin(suspend_state_t state)
{
if (lite5200_pm_valid(state)) {
lite5200_pm_target_state = state;
@ -219,12 +219,18 @@ static void lite5200_pm_finish(void)
mpc52xx_pm_finish();
}
static void lite5200_pm_end(void)
{
lite5200_pm_target_state = PM_SUSPEND_ON;
}
static struct platform_suspend_ops lite5200_pm_ops = {
.valid = lite5200_pm_valid,
.set_target = lite5200_pm_set_target,
.begin = lite5200_pm_begin,
.prepare = lite5200_pm_prepare,
.enter = lite5200_pm_enter,
.finish = lite5200_pm_finish,
.end = lite5200_pm_end,
};
int __init lite5200_pm_init(void)

4
arch/sh/Kconfig
View File

@ -882,6 +882,10 @@ endmenu
menu "Power management options (EXPERIMENTAL)"
depends on EXPERIMENTAL && SYS_SUPPORTS_PM
config ARCH_SUSPEND_POSSIBLE
def_bool y
depends on !SMP
source kernel/power/Kconfig
endmenu

8
arch/x86/Kconfig
View File

@ -112,6 +112,14 @@ config ARCH_SUPPORTS_OPROFILE
select HAVE_KVM
config ARCH_HIBERNATION_POSSIBLE
def_bool y
depends on !SMP || !X86_VOYAGER
config ARCH_SUSPEND_POSSIBLE
def_bool y
depends on !X86_VOYAGER
config ZONE_DMA32
bool
default X86_64

8
arch/x86/kernel/suspend_64.c
View File

@ -140,7 +140,12 @@ static void fix_processor_context(void)
int cpu = smp_processor_id();
struct tss_struct *t = &per_cpu(init_tss, cpu);
set_tss_desc(cpu,t); /* This just modifies memory; should not be necessary. But... This is necessary, because 386 hardware has concept of busy TSS or some similar stupidity. */
/*
* This just modifies memory; should not be necessary. But... This
* is necessary, because 386 hardware has concept of busy TSS or some
* similar stupidity.
*/
set_tss_desc(cpu, t);
get_cpu_gdt_table(cpu)[GDT_ENTRY_TSS].type = 9;
@ -160,7 +165,6 @@ static void fix_processor_context(void)
loaddebug(&current->thread, 6);
loaddebug(&current->thread, 7);
}
}
#ifdef CONFIG_HIBERNATION

10
arch/x86/mm/init_32.c
View File

@ -423,23 +423,23 @@ static void __init pagetable_init(void)
paravirt_pagetable_setup_done(pgd_base);
}
#if defined(CONFIG_HIBERNATION) || defined(CONFIG_ACPI)
#ifdef CONFIG_ACPI_SLEEP
/*
* Swap suspend & friends need this for resume because things like the intel-agp
* ACPI suspend needs this for resume, because things like the intel-agp
* driver might have split up a kernel 4MB mapping.
*/
char __nosavedata swsusp_pg_dir[PAGE_SIZE]
char swsusp_pg_dir[PAGE_SIZE]
__attribute__ ((aligned(PAGE_SIZE)));
static inline void save_pg_dir(void)
{
memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE);
}
#else
#else /* !CONFIG_ACPI_SLEEP */
static inline void save_pg_dir(void)
{
}
#endif
#endif /* !CONFIG_ACPI_SLEEP */
void zap_low_mappings(void)
{

79
drivers/acpi/hardware/hwsleep.c
View File

@ -192,18 +192,13 @@ acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = sleep_state;
/* Run the _PTS and _GTS methods */
/* Run the _PTS method */
status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
return_ACPI_STATUS(status);
}
status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
return_ACPI_STATUS(status);
}
/* Setup the argument to _SST */
switch (sleep_state) {
@ -234,10 +229,6 @@ acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
"While executing method _SST"));
}
/* Disable/Clear all GPEs */
status = acpi_hw_disable_all_gpes();
return_ACPI_STATUS(status);
}
@ -262,6 +253,8 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
struct acpi_bit_register_info *sleep_type_reg_info;
struct acpi_bit_register_info *sleep_enable_reg_info;
u32 in_value;
struct acpi_object_list arg_list;
union acpi_object arg;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
@ -307,6 +300,18 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
return_ACPI_STATUS(status);
}
/* Execute the _GTS method */
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = sleep_state;
status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
return_ACPI_STATUS(status);
}
/* Get current value of PM1A control */
status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
@ -473,17 +478,18 @@ ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
/*******************************************************************************
*
* FUNCTION: acpi_leave_sleep_state
* FUNCTION: acpi_leave_sleep_state_prep
*
* PARAMETERS: sleep_state - Which sleep state we just exited
* PARAMETERS: sleep_state - Which sleep state we are exiting
*
* RETURN: Status
*
* DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
* Called with interrupts ENABLED.
* DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
* sleep.
* Called with interrupts DISABLED.
*
******************************************************************************/
acpi_status acpi_leave_sleep_state(u8 sleep_state)
acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
{
struct acpi_object_list arg_list;
union acpi_object arg;
@ -493,7 +499,7 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
u32 PM1Acontrol;
u32 PM1Bcontrol;
ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
/*
* Set SLP_TYPE and SLP_EN to state S0.
@ -540,6 +546,41 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
}
}
/* Execute the _BFS method */
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = sleep_state;
status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_leave_sleep_state
*
* PARAMETERS: sleep_state - Which sleep state we just exited
*
* RETURN: Status
*
* DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
* Called with interrupts ENABLED.
*
******************************************************************************/
acpi_status acpi_leave_sleep_state(u8 sleep_state)
{
struct acpi_object_list arg_list;
union acpi_object arg;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
/* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
@ -558,12 +599,6 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
}
arg.integer.value = sleep_state;
status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
}
/*
* GPEs must be enabled before _WAK is called as GPEs
* might get fired there

129
drivers/acpi/sleep/main.c
View File

@ -26,9 +26,24 @@ u8 sleep_states[ACPI_S_STATE_COUNT];
#ifdef CONFIG_PM_SLEEP
static u32 acpi_target_sleep_state = ACPI_STATE_S0;
static bool acpi_sleep_finish_wake_up;
/*
* ACPI 2.0 and later want us to execute _PTS after suspending devices, so we
* allow the user to request that behavior by using the 'acpi_new_pts_ordering'
* kernel command line option that causes the following variable to be set.
*/
static bool new_pts_ordering;
static int __init acpi_new_pts_ordering(char *str)
{
new_pts_ordering = true;
return 1;
}
__setup("acpi_new_pts_ordering", acpi_new_pts_ordering);
#endif
int acpi_sleep_prepare(u32 acpi_state)
static int acpi_sleep_prepare(u32 acpi_state)
{
#ifdef CONFIG_ACPI_SLEEP
/* do we have a wakeup address for S2 and S3? */
@ -44,6 +59,8 @@ int acpi_sleep_prepare(u32 acpi_state)
ACPI_FLUSH_CPU_CACHE();
acpi_enable_wakeup_device_prep(acpi_state);
#endif
printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
acpi_state);
acpi_enter_sleep_state_prep(acpi_state);
return 0;
}
@ -63,17 +80,25 @@ static u32 acpi_suspend_states[] = {
static int init_8259A_after_S1;
/**
* acpi_pm_set_target - Set the target system sleep state to the state
* acpi_pm_begin - Set the target system sleep state to the state
* associated with given @pm_state, if supported.
*/
static int acpi_pm_set_target(suspend_state_t pm_state)
static int acpi_pm_begin(suspend_state_t pm_state)
{
u32 acpi_state = acpi_suspend_states[pm_state];
int error = 0;
if (sleep_states[acpi_state]) {
acpi_target_sleep_state = acpi_state;
if (new_pts_ordering)
return 0;
error = acpi_sleep_prepare(acpi_state);
if (error)
acpi_target_sleep_state = ACPI_STATE_S0;
else
acpi_sleep_finish_wake_up = true;
} else {
printk(KERN_ERR "ACPI does not support this state: %d\n",
pm_state);
@ -91,12 +116,17 @@ static int acpi_pm_set_target(suspend_state_t pm_state)
static int acpi_pm_prepare(void)
{
int error = acpi_sleep_prepare(acpi_target_sleep_state);
if (new_pts_ordering) {
int error = acpi_sleep_prepare(acpi_target_sleep_state);
if (error)
acpi_target_sleep_state = ACPI_STATE_S0;
if (error) {
acpi_target_sleep_state = ACPI_STATE_S0;
return error;
}
acpi_sleep_finish_wake_up = true;
}
return error;
return ACPI_SUCCESS(acpi_hw_disable_all_gpes()) ? 0 : -EFAULT;
}
/**
@ -120,10 +150,8 @@ static int acpi_pm_enter(suspend_state_t pm_state)
if (acpi_state == ACPI_STATE_S3) {
int error = acpi_save_state_mem();
if (error) {
acpi_target_sleep_state = ACPI_STATE_S0;
if (error)
return error;
}
}
local_irq_save(flags);
@ -139,6 +167,9 @@ static int acpi_pm_enter(suspend_state_t pm_state)
break;
}
/* Reprogram control registers and execute _BFS */
acpi_leave_sleep_state_prep(acpi_state);
/* ACPI 3.0 specs (P62) says that it's the responsabilty
* of the OSPM to clear the status bit [ implying that the
* POWER_BUTTON event should not reach userspace ]
@ -146,6 +177,13 @@ static int acpi_pm_enter(suspend_state_t pm_state)
if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
/*
* Disable and clear GPE status before interrupt is enabled. Some GPEs
* (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
* acpi_leave_sleep_state will reenable specific GPEs later
*/
acpi_hw_disable_all_gpes();
local_irq_restore(flags);
printk(KERN_DEBUG "Back to C!\n");
@ -157,7 +195,7 @@ static int acpi_pm_enter(suspend_state_t pm_state)
}
/**
* acpi_pm_finish - Finish up suspend sequence.
* acpi_pm_finish - Instruct the platform to leave a sleep state.
*
* This is called after we wake back up (or if entering the sleep state
* failed).
@ -174,6 +212,7 @@ static void acpi_pm_finish(void)
acpi_set_firmware_waking_vector((acpi_physical_address) 0);
acpi_target_sleep_state = ACPI_STATE_S0;
acpi_sleep_finish_wake_up = false;
#ifdef CONFIG_X86
if (init_8259A_after_S1) {
@ -183,6 +222,20 @@ static void acpi_pm_finish(void)
#endif
}
/**
* acpi_pm_end - Finish up suspend sequence.
*/
static void acpi_pm_end(void)
{
/*
* This is necessary in case acpi_pm_finish() is not called directly
* during a failing transition to a sleep state.
*/
if (acpi_sleep_finish_wake_up)
acpi_pm_finish();
}
static int acpi_pm_state_valid(suspend_state_t pm_state)
{
u32 acpi_state;
@ -201,10 +254,11 @@ static int acpi_pm_state_valid(suspend_state_t pm_state)
static struct platform_suspend_ops acpi_pm_ops = {
.valid = acpi_pm_state_valid,
.set_target = acpi_pm_set_target,
.begin = acpi_pm_begin,
.prepare = acpi_pm_prepare,
.enter = acpi_pm_enter,
.finish = acpi_pm_finish,
.end = acpi_pm_end,
};
/*
@ -229,15 +283,36 @@ static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
#endif /* CONFIG_SUSPEND */
#ifdef CONFIG_HIBERNATION
static int acpi_hibernation_start(void)
static int acpi_hibernation_begin(void)
{
int error;
acpi_target_sleep_state = ACPI_STATE_S4;
return 0;
if (new_pts_ordering)
return 0;
error = acpi_sleep_prepare(ACPI_STATE_S4);
if (error)
acpi_target_sleep_state = ACPI_STATE_S0;
else
acpi_sleep_finish_wake_up = true;
return error;
}
static int acpi_hibernation_prepare(void)
{
return acpi_sleep_prepare(ACPI_STATE_S4);
if (new_pts_ordering) {
int error = acpi_sleep_prepare(ACPI_STATE_S4);
if (error) {
acpi_target_sleep_state = ACPI_STATE_S0;
return error;
}
acpi_sleep_finish_wake_up = true;
}
return ACPI_SUCCESS(acpi_hw_disable_all_gpes()) ? 0 : -EFAULT;
}
static int acpi_hibernation_enter(void)
@ -251,6 +326,8 @@ static int acpi_hibernation_enter(void)
acpi_enable_wakeup_device(ACPI_STATE_S4);
/* This shouldn't return. If it returns, we have a problem */
status = acpi_enter_sleep_state(ACPI_STATE_S4);
/* Reprogram control registers and execute _BFS */
acpi_leave_sleep_state_prep(ACPI_STATE_S4);
local_irq_restore(flags);
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
@ -263,15 +340,12 @@ static void acpi_hibernation_leave(void)
* enable it here.
*/
acpi_enable();
/* Reprogram control registers and execute _BFS */
acpi_leave_sleep_state_prep(ACPI_STATE_S4);
}
static void acpi_hibernation_finish(void)
{
/*
* If ACPI is not enabled by the BIOS and the boot kernel, we need to
* enable it here.
*/
acpi_enable();
acpi_disable_wakeup_device(ACPI_STATE_S4);
acpi_leave_sleep_state(ACPI_STATE_S4);
@ -279,6 +353,17 @@ static void acpi_hibernation_finish(void)
acpi_set_firmware_waking_vector((acpi_physical_address) 0);
acpi_target_sleep_state = ACPI_STATE_S0;
acpi_sleep_finish_wake_up = false;
}
static void acpi_hibernation_end(void)
{
/*
* This is necessary in case acpi_hibernation_finish() is not called
* directly during a failing transition to the sleep state.
*/
if (acpi_sleep_finish_wake_up)
acpi_hibernation_finish();
}
static int acpi_hibernation_pre_restore(void)
@ -296,7 +381,8 @@ static void acpi_hibernation_restore_cleanup(void)
}
static struct platform_hibernation_ops acpi_hibernation_ops = {
.start = acpi_hibernation_start,
.begin = acpi_hibernation_begin,
.end = acpi_hibernation_end,
.pre_snapshot = acpi_hibernation_prepare,
.finish = acpi_hibernation_finish,
.prepare = acpi_hibernation_prepare,
@ -403,6 +489,7 @@ static void acpi_power_off_prepare(void)
{
/* Prepare to power off the system */
acpi_sleep_prepare(ACPI_STATE_S5);
acpi_hw_disable_all_gpes();
}
static void acpi_power_off(void)

2
drivers/acpi/sleep/sleep.h
View File

@ -5,5 +5,3 @@ extern int acpi_suspend (u32 state);
extern void acpi_enable_wakeup_device_prep(u8 sleep_state);
extern void acpi_enable_wakeup_device(u8 sleep_state);
extern void acpi_disable_wakeup_device(u8 sleep_state);
extern int acpi_sleep_prepare(u32 acpi_state);

2
drivers/base/power/Makefile
View File

@ -1,6 +1,6 @@
obj-$(CONFIG_PM) += sysfs.o
obj-$(CONFIG_PM_SLEEP) += main.o
obj-$(CONFIG_PM_TRACE) += trace.o
obj-$(CONFIG_PM_TRACE_RTC) += trace.o
ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
ccflags-$(CONFIG_PM_VERBOSE) += -DDEBUG

2
include/acpi/acpixf.h
View File

@ -335,6 +335,8 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state);
acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void);
acpi_status acpi_leave_sleep_state_prep(u8 sleep_state);
acpi_status acpi_leave_sleep_state(u8 sleep_state);
#endif /* __ACXFACE_H__ */

1
include/linux/Kbuild
View File

@ -143,6 +143,7 @@ header-y += snmp.h
header-y += sockios.h
header-y += som.h
header-y += sound.h
header-y += suspend_ioctls.h
header-y += taskstats.h
header-y += telephony.h
header-y += termios.h

2
include/linux/notifier.h
View File

@ -228,6 +228,8 @@ static inline int notifier_to_errno(int ret)
#define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */
#define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */
#define PM_POST_SUSPEND 0x0004 /* Suspend finished */
#define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */
#define PM_POST_RESTORE 0x0006 /* Restore failed */
/* Console keyboard events.
* Note: KBD_KEYCODE is always sent before KBD_UNBOUND_KEYCODE, KBD_UNICODE and

56
include/linux/suspend.h
View File

@ -38,18 +38,16 @@ typedef int __bitwise suspend_state_t;
* There is the %suspend_valid_only_mem function available that can be
* assigned to this if the platform only supports mem sleep.
*
* @set_target: Tell the platform which system sleep state is going to be
* entered.
* @set_target() is executed right prior to suspending devices. The
* information conveyed to the platform code by @set_target() should be
* disregarded by the platform as soon as @finish() is executed and if
* @prepare() fails. If @set_target() fails (ie. returns nonzero),
* @begin: Initialise a transition to given system sleep state.
* @begin() is executed right prior to suspending devices. The information
* conveyed to the platform code by @begin() should be disregarded by it as
* soon as @end() is executed. If @begin() fails (ie. returns nonzero),
* @prepare(), @enter() and @finish() will not be called by the PM core.
* This callback is optional. However, if it is implemented, the argument
* passed to @enter() is meaningless and should be ignored.
* passed to @enter() is redundant and should be ignored.
*
* @prepare: Prepare the platform for entering the system sleep state indicated
* by @set_target().
* by @begin().
* @prepare() is called right after devices have been suspended (ie. the
* appropriate .suspend() method has been executed for each device) and
* before the nonboot CPUs are disabled (it is executed with IRQs enabled).
@ -57,8 +55,8 @@ typedef int __bitwise suspend_state_t;
* error code otherwise, in which case the system cannot enter the desired
* sleep state (@enter() and @finish() will not be called in that case).
*
* @enter: Enter the system sleep state indicated by @set_target() or
* represented by the argument if @set_target() is not implemented.
* @enter: Enter the system sleep state indicated by @begin() or represented by
* the argument if @begin() is not implemented.
* This callback is mandatory. It returns 0 on success or a negative
* error code otherwise, in which case the system cannot enter the desired
* sleep state.
@ -69,13 +67,22 @@ typedef int __bitwise suspend_state_t;
* This callback is optional, but should be implemented by the platforms
* that implement @prepare(). If implemented, it is always called after
* @enter() (even if @enter() fails).
*
* @end: Called by the PM core right after resuming devices, to indicate to
* the platform that the system has returned to the working state or
* the transition to the sleep state has been aborted.
* This callback is optional, but should be implemented by the platforms
* that implement @begin(), but platforms implementing @begin() should
* also provide a @end() which cleans up transitions aborted before
* @enter().
*/
struct platform_suspend_ops {
int (*valid)(suspend_state_t state);
int (*set_target)(suspend_state_t state);
int (*begin)(suspend_state_t state);
int (*prepare)(void);
int (*enter)(suspend_state_t state);
void (*finish)(void);
void (*end)(void);
};
#ifdef CONFIG_SUSPEND
@ -129,14 +136,17 @@ extern void mark_free_pages(struct zone *zone);
/**
* struct platform_hibernation_ops - hibernation platform support
*
* The methods in this structure allow a platform to override the default
* mechanism of shutting down the machine during a hibernation transition.
* The methods in this structure allow a platform to carry out special
* operations required by it during a hibernation transition.
*
* All three methods must be assigned.
* All the methods below must be implemented.
*
* @start: Tell the platform driver that we're starting hibernation.
* @begin: Tell the platform driver that we're starting hibernation.
* Called right after shrinking memory and before freezing devices.
*
* @end: Called by the PM core right after resuming devices, to indicate to
* the platform that the system has returned to the working state.
*
* @pre_snapshot: Prepare the platform for creating the hibernation image.
* Called right after devices have been frozen and before the nonboot
* CPUs are disabled (runs with IRQs on).
@ -171,7 +181,8 @@ extern void mark_free_pages(struct zone *zone);
* thawing devices (runs with IRQs on).
*/
struct platform_hibernation_ops {
int (*start)(void);
int (*begin)(void);
void (*end)(void);
int (*pre_snapshot)(void);
void (*finish)(void);
int (*prepare)(void);
@ -213,17 +224,8 @@ void save_processor_state(void);
void restore_processor_state(void);
/* kernel/power/main.c */
extern struct blocking_notifier_head pm_chain_head;
static inline int register_pm_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&pm_chain_head, nb);
}
static inline int unregister_pm_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&pm_chain_head, nb);
}
extern int register_pm_notifier(struct notifier_block *nb);
extern int unregister_pm_notifier(struct notifier_block *nb);
#define pm_notifier(fn, pri) { \
static struct notifier_block fn##_nb = \

32
include/linux/suspend_ioctls.h Normal file
View File

@ -0,0 +1,32 @@
#ifndef _LINUX_SUSPEND_IOCTLS_H
#define _LINUX_SUSPEND_IOCTLS_H
/*
* This structure is used to pass the values needed for the identification
* of the resume swap area from a user space to the kernel via the
* SNAPSHOT_SET_SWAP_AREA ioctl
*/
struct resume_swap_area {
loff_t offset;
u_int32_t dev;
} __attribute__((packed));
#define SNAPSHOT_IOC_MAGIC '3'
#define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
#define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
#define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
#define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
#define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
#define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
#define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \
struct resume_swap_area)
#define SNAPSHOT_GET_IMAGE_SIZE _IOR(SNAPSHOT_IOC_MAGIC, 14, loff_t)
#define SNAPSHOT_PLATFORM_SUPPORT _IO(SNAPSHOT_IOC_MAGIC, 15)
#define SNAPSHOT_POWER_OFF _IO(SNAPSHOT_IOC_MAGIC, 16)
#define SNAPSHOT_CREATE_IMAGE _IOW(SNAPSHOT_IOC_MAGIC, 17, int)
#define SNAPSHOT_PREF_IMAGE_SIZE _IO(SNAPSHOT_IOC_MAGIC, 18)
#define SNAPSHOT_AVAIL_SWAP_SIZE _IOR(SNAPSHOT_IOC_MAGIC, 19, loff_t)
#define SNAPSHOT_ALLOC_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 20, loff_t)
#define SNAPSHOT_IOC_MAXNR 20
#endif /* _LINUX_SUSPEND_IOCTLS_H */

65
kernel/power/Kconfig
View File

@ -44,9 +44,30 @@ config PM_VERBOSE
---help---
This option enables verbose messages from the Power Management code.
config CAN_PM_TRACE
def_bool y
depends on PM_DEBUG && PM_SLEEP && EXPERIMENTAL
config PM_TRACE
bool
help
This enables code to save the last PM event point across
reboot. The architecture needs to support this, x86 for
example does by saving things in the RTC, see below.
The architecture specific code must provide the extern
functions from <linux/resume-trace.h> as well as the
<asm/resume-trace.h> header with a TRACE_RESUME() macro.
The way the information is presented is architecture-
dependent, x86 will print the information during a
late_initcall.
config PM_TRACE_RTC
bool "Suspend/resume event tracing"
depends on PM_DEBUG && X86 && PM_SLEEP && EXPERIMENTAL
depends on CAN_PM_TRACE
depends on X86
select PM_TRACE
default n
---help---
This enables some cheesy code to save the last PM event point in the
@ -63,7 +84,8 @@ config PM_TRACE
config PM_SLEEP_SMP
bool
depends on SUSPEND_SMP_POSSIBLE || HIBERNATION_SMP_POSSIBLE
depends on SMP
depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
depends on PM_SLEEP
select HOTPLUG_CPU
default y
@ -73,46 +95,29 @@ config PM_SLEEP
depends on SUSPEND || HIBERNATION
default y
config SUSPEND_UP_POSSIBLE
bool
depends on (X86 && !X86_VOYAGER) || PPC || ARM || BLACKFIN || MIPS \
|| SUPERH || FRV
depends on !SMP
default y
config SUSPEND_SMP_POSSIBLE
bool
depends on (X86 && !X86_VOYAGER) \
|| (PPC && (PPC_PSERIES || PPC_PMAC)) || ARM
depends on SMP
default y
config SUSPEND
bool "Suspend to RAM and standby"
depends on PM
depends on SUSPEND_UP_POSSIBLE || SUSPEND_SMP_POSSIBLE
depends on PM && ARCH_SUSPEND_POSSIBLE
default y
---help---
Allow the system to enter sleep states in which main memory is
powered and thus its contents are preserved, such as the
suspend-to-RAM state (i.e. the ACPI S3 state).
suspend-to-RAM state (e.g. the ACPI S3 state).
config HIBERNATION_UP_POSSIBLE
bool
depends on X86 || PPC64_SWSUSP || PPC32
depends on !SMP
config SUSPEND_FREEZER
bool "Enable freezer for suspend to RAM/standby" \
if ARCH_WANTS_FREEZER_CONTROL || BROKEN
depends on SUSPEND
default y
help
This allows you to turn off the freezer for suspend. If this is
done, no tasks are frozen for suspend to RAM/standby.
config HIBERNATION_SMP_POSSIBLE
bool
depends on (X86 && !X86_VOYAGER) || PPC64_SWSUSP
depends on SMP
default y
Turning OFF this setting is NOT recommended! If in doubt, say Y.
config HIBERNATION
bool "Hibernation (aka 'suspend to disk')"
depends on PM && SWAP
depends on HIBERNATION_UP_POSSIBLE || HIBERNATION_SMP_POSSIBLE
depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
---help---
Enable the suspend to disk (STD) functionality, which is usually
called "hibernation" in user interfaces. STD checkpoints the

204
kernel/power/disk.c
View File

@ -54,8 +54,8 @@ static struct platform_hibernation_ops *hibernation_ops;
void hibernation_set_ops(struct platform_hibernation_ops *ops)
{
if (ops && !(ops->start && ops->pre_snapshot && ops->finish
&& ops->prepare && ops->enter && ops->pre_restore
if (ops && !(ops->begin && ops->end && ops->pre_snapshot
&& ops->prepare && ops->finish && ops->enter && ops->pre_restore
&& ops->restore_cleanup)) {
WARN_ON(1);
return;
@ -70,15 +70,55 @@ void hibernation_set_ops(struct platform_hibernation_ops *ops)
mutex_unlock(&pm_mutex);
}
#ifdef CONFIG_PM_DEBUG
static void hibernation_debug_sleep(void)
{
printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
mdelay(5000);
}
static int hibernation_testmode(int mode)
{
if (hibernation_mode == mode) {
hibernation_debug_sleep();
return 1;
}
return 0;
}
static int hibernation_test(int level)
{
if (pm_test_level == level) {
hibernation_debug_sleep();
return 1;
}
return 0;
}
#else /* !CONFIG_PM_DEBUG */
static int hibernation_testmode(int mode) { return 0; }
static int hibernation_test(int level) { return 0; }
#endif /* !CONFIG_PM_DEBUG */
/**
* platform_start - tell the platform driver that we're starting
* platform_begin - tell the platform driver that we're starting
* hibernation
*/
static int platform_start(int platform_mode)
static int platform_begin(int platform_mode)
{
return (platform_mode && hibernation_ops) ?
hibernation_ops->start() : 0;
hibernation_ops->begin() : 0;
}
/**
* platform_end - tell the platform driver that we've entered the
* working state
*/
static void platform_end(int platform_mode)
{
if (platform_mode && hibernation_ops)
hibernation_ops->end();
}
/**
@ -162,19 +202,25 @@ int create_image(int platform_mode)
*/
error = device_power_down(PMSG_FREEZE);
if (error) {
printk(KERN_ERR "Some devices failed to power down, "
KERN_ERR "aborting suspend\n");
printk(KERN_ERR "PM: Some devices failed to power down, "
"aborting hibernation\n");
goto Enable_irqs;
}
if (hibernation_test(TEST_CORE))
goto Power_up;
in_suspend = 1;
save_processor_state();
error = swsusp_arch_suspend();
if (error)
printk(KERN_ERR "Error %d while creating the image\n", error);
printk(KERN_ERR "PM: Error %d creating hibernation image\n",
error);
/* Restore control flow magically appears here */
restore_processor_state();
if (!in_suspend)
platform_leave(platform_mode);
Power_up:
/* NOTE: device_power_up() is just a resume() for devices
* that suspended with irqs off ... no overall powerup.
*/
@ -202,36 +248,90 @@ int hibernation_snapshot(int platform_mode)
if (error)
return error;
error = platform_start(platform_mode);
error = platform_begin(platform_mode);
if (error)
return error;
goto Close;
suspend_console();
error = device_suspend(PMSG_FREEZE);
if (error)
goto Resume_console;
error = platform_pre_snapshot(platform_mode);
if (error)
if (hibernation_test(TEST_DEVICES))
goto Resume_devices;
error = platform_pre_snapshot(platform_mode);
if (error || hibernation_test(TEST_PLATFORM))
goto Finish;
error = disable_nonboot_cpus();
if (!error) {
if (hibernation_mode != HIBERNATION_TEST) {
in_suspend = 1;
error = create_image(platform_mode);
/* Control returns here after successful restore */
} else {
printk("swsusp debug: Waiting for 5 seconds.\n");
mdelay(5000);
}
if (hibernation_test(TEST_CPUS))
goto Enable_cpus;
if (hibernation_testmode(HIBERNATION_TEST))
goto Enable_cpus;
error = create_image(platform_mode);
/* Control returns here after successful restore */
}
Enable_cpus:
enable_nonboot_cpus();
Resume_devices:
Finish:
platform_finish(platform_mode);
Resume_devices:
device_resume();
Resume_console:
resume_console();
Close:
platform_end(platform_mode);
return error;
}
/**
* resume_target_kernel - prepare devices that need to be suspended with
* interrupts off, restore the contents of highmem that have not been
* restored yet from the image and run the low level code that will restore
* the remaining contents of memory and switch to the just restored target
* kernel.
*/
static int resume_target_kernel(void)
{
int error;
local_irq_disable();
error = device_power_down(PMSG_PRETHAW);
if (error) {
printk(KERN_ERR "PM: Some devices failed to power down, "
"aborting resume\n");
goto Enable_irqs;
}
/* We'll ignore saved state, but this gets preempt count (etc) right */
save_processor_state();
error = restore_highmem();
if (!error) {
error = swsusp_arch_resume();
/*
* The code below is only ever reached in case of a failure.
* Otherwise execution continues at place where
* swsusp_arch_suspend() was called
*/
BUG_ON(!error);
/* This call to restore_highmem() undos the previous one */
restore_highmem();
}
/*
* The only reason why swsusp_arch_resume() can fail is memory being
* very tight, so we have to free it as soon as we can to avoid
* subsequent failures
*/
swsusp_free();
restore_processor_state();
touch_softlockup_watchdog();
device_power_up();
Enable_irqs:
local_irq_enable();
return error;
}
@ -258,7 +358,7 @@ int hibernation_restore(int platform_mode)
if (!error) {
error = disable_nonboot_cpus();
if (!error)
error = swsusp_resume();
error = resume_target_kernel();
enable_nonboot_cpus();
}
platform_restore_cleanup(platform_mode);
@ -286,9 +386,9 @@ int hibernation_platform_enter(void)
* hibernation_ops->finish() before saving the image, so we should let
* the firmware know that we're going to enter the sleep state after all
*/
error = hibernation_ops->start();
error = hibernation_ops->begin();
if (error)
return error;
goto Close;
suspend_console();
error = device_suspend(PMSG_SUSPEND);
@ -322,6 +422,8 @@ int hibernation_platform_enter(void)
device_resume();
Resume_console:
resume_console();
Close:
hibernation_ops->end();
return error;
}
@ -352,24 +454,17 @@ static void power_down(void)
* Valid image is on the disk, if we continue we risk serious data
* corruption after resume.
*/
printk(KERN_CRIT "Please power me down manually\n");
printk(KERN_CRIT "PM: Please power down manually\n");
while(1);
}
static void unprepare_processes(void)
{
thaw_processes();
pm_restore_console();
}
static int prepare_processes(void)
{
int error = 0;
pm_prepare_console();
if (freeze_processes()) {
error = -EBUSY;
unprepare_processes();
thaw_processes();
}
return error;
}
@ -389,6 +484,7 @@ int hibernate(void)
goto Unlock;
}
pm_prepare_console();
error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
if (error)
goto Exit;
@ -398,7 +494,7 @@ int hibernate(void)
if (error)
goto Exit;
printk("Syncing filesystems ... ");
printk(KERN_INFO "PM: Syncing filesystems ... ");
sys_sync();
printk("done.\n");
@ -406,11 +502,12 @@ int hibernate(void)
if (error)
goto Finish;
if (hibernation_mode == HIBERNATION_TESTPROC) {
printk("swsusp debug: Waiting for 5 seconds.\n");
mdelay(5000);
if (hibernation_test(TEST_FREEZER))
goto Thaw;
}
if (hibernation_testmode(HIBERNATION_TESTPROC))
goto Thaw;
error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
if (in_suspend && !error) {
unsigned int flags = 0;
@ -427,11 +524,12 @@ int hibernate(void)
swsusp_free();
}
Thaw:
unprepare_processes();
thaw_processes();
Finish:
free_basic_memory_bitmaps();
Exit:
pm_notifier_call_chain(PM_POST_HIBERNATION);
pm_restore_console();
atomic_inc(&snapshot_device_available);
Unlock:
mutex_unlock(&pm_mutex);
@ -473,22 +571,23 @@ static int software_resume(void)
return -ENOENT;
}
swsusp_resume_device = name_to_dev_t(resume_file);
pr_debug("swsusp: Resume From Partition %s\n", resume_file);
pr_debug("PM: Resume from partition %s\n", resume_file);
} else {
pr_debug("swsusp: Resume From Partition %d:%d\n",
MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
pr_debug("PM: Resume from partition %d:%d\n",
MAJOR(swsusp_resume_device),
MINOR(swsusp_resume_device));
}
if (noresume) {
/**
* FIXME: If noresume is specified, we need to find the partition
* and reset it back to normal swap space.
* FIXME: If noresume is specified, we need to find the
* partition and reset it back to normal swap space.
*/
mutex_unlock(&pm_mutex);
return 0;
}
pr_debug("PM: Checking swsusp image.\n");
pr_debug("PM: Checking hibernation image.\n");
error = swsusp_check();
if (error)
goto Unlock;
@ -499,6 +598,11 @@ static int software_resume(void)
goto Unlock;
}
pm_prepare_console();
error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
if (error)
goto Finish;
error = create_basic_memory_bitmaps();
if (error)
goto Finish;
@ -510,7 +614,7 @@ static int software_resume(void)
goto Done;
}
pr_debug("PM: Reading swsusp image.\n");
pr_debug("PM: Reading hibernation image.\n");
error = swsusp_read(&flags);
if (!error)
@ -518,10 +622,12 @@ static int software_resume(void)
printk(KERN_ERR "PM: Restore failed, recovering.\n");
swsusp_free();
unprepare_processes();
thaw_processes();
Done:
free_basic_memory_bitmaps();
Finish:
pm_notifier_call_chain(PM_POST_RESTORE);
pm_restore_console();
atomic_inc(&snapshot_device_available);
/* For success case, the suspend path will release the lock */
Unlock:
@ -636,7 +742,7 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
error = -EINVAL;
if (!error)
pr_debug("PM: suspend-to-disk mode set to '%s'\n",
pr_debug("PM: Hibernation mode set to '%s'\n",
hibernation_modes[mode]);
mutex_unlock(&pm_mutex);
return error ? error : n;
@ -668,7 +774,7 @@ static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
mutex_lock(&pm_mutex);
swsusp_resume_device = res;
mutex_unlock(&pm_mutex);
printk("Attempting manual resume\n");
printk(KERN_INFO "PM: Starting manual resume from disk\n");
noresume = 0;
software_resume();
ret = n;

171
kernel/power/main.c
View File

@ -24,13 +24,112 @@
#include "power.h"
BLOCKING_NOTIFIER_HEAD(pm_chain_head);
DEFINE_MUTEX(pm_mutex);
unsigned int pm_flags;
EXPORT_SYMBOL(pm_flags);
#ifdef CONFIG_PM_SLEEP
/* Routines for PM-transition notifications */
static BLOCKING_NOTIFIER_HEAD(pm_chain_head);
int register_pm_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&pm_chain_head, nb);
}
EXPORT_SYMBOL_GPL(register_pm_notifier);
int unregister_pm_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&pm_chain_head, nb);
}
EXPORT_SYMBOL_GPL(unregister_pm_notifier);
int pm_notifier_call_chain(unsigned long val)
{
return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
== NOTIFY_BAD) ? -EINVAL : 0;
}
#ifdef CONFIG_PM_DEBUG
int pm_test_level = TEST_NONE;
static int suspend_test(int level)
{
if (pm_test_level == level) {
printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
mdelay(5000);
return 1;
}
return 0;
}
static const char * const pm_tests[__TEST_AFTER_LAST] = {
[TEST_NONE] = "none",
[TEST_CORE] = "core",
[TEST_CPUS] = "processors",
[TEST_PLATFORM] = "platform",
[TEST_DEVICES] = "devices",
[TEST_FREEZER] = "freezer",
};
static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
char *s = buf;
int level;
for (level = TEST_FIRST; level <= TEST_MAX; level++)
if (pm_tests[level]) {
if (level == pm_test_level)
s += sprintf(s, "[%s] ", pm_tests[level]);
else
s += sprintf(s, "%s ", pm_tests[level]);
}
if (s != buf)
/* convert the last space to a newline */
*(s-1) = '\n';
return (s - buf);
}
static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t n)
{
const char * const *s;
int level;
char *p;
int len;
int error = -EINVAL;
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
mutex_lock(&pm_mutex);
level = TEST_FIRST;
for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++)
if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) {
pm_test_level = level;
error = 0;
break;
}
mutex_unlock(&pm_mutex);
return error ? error : n;
}
power_attr(pm_test);
#else /* !CONFIG_PM_DEBUG */
static inline int suspend_test(int level) { return 0; }
#endif /* !CONFIG_PM_DEBUG */
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_SUSPEND
/* This is just an arbitrary number */
@ -76,13 +175,13 @@ static int suspend_prepare(void)
if (!suspend_ops || !suspend_ops->enter)
return -EPERM;
pm_prepare_console();
error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
if (error)
goto Finish;
pm_prepare_console();
if (freeze_processes()) {
if (suspend_freeze_processes()) {
error = -EAGAIN;
goto Thaw;
}
@ -100,10 +199,10 @@ static int suspend_prepare(void)
return 0;
Thaw:
thaw_processes();
pm_restore_console();
suspend_thaw_processes();
Finish:
pm_notifier_call_chain(PM_POST_SUSPEND);
pm_restore_console();
return error;
}
@ -133,10 +232,13 @@ static int suspend_enter(suspend_state_t state)
BUG_ON(!irqs_disabled());
if ((error = device_power_down(PMSG_SUSPEND))) {
printk(KERN_ERR "Some devices failed to power down\n");
printk(KERN_ERR "PM: Some devices failed to power down\n");
goto Done;
}
error = suspend_ops->enter(state);
if (!suspend_test(TEST_CORE))
error = suspend_ops->enter(state);
device_power_up();
Done:
arch_suspend_enable_irqs();
@ -145,8 +247,8 @@ static int suspend_enter(suspend_state_t state)
}
/**
* suspend_devices_and_enter - suspend devices and enter the desired system sleep
* state.
* suspend_devices_and_enter - suspend devices and enter the desired system
* sleep state.
* @state: state to enter
*/
int suspend_devices_and_enter(suspend_state_t state)
@ -156,33 +258,45 @@ int suspend_devices_and_enter(suspend_state_t state)
if (!suspend_ops)
return -ENOSYS;
if (suspend_ops->set_target) {
error = suspend_ops->set_target(state);
if (suspend_ops->begin) {
error = suspend_ops->begin(state);
if (error)
return error;
goto Close;
}
suspend_console();
error = device_suspend(PMSG_SUSPEND);
if (error) {
printk(KERN_ERR "Some devices failed to suspend\n");
printk(KERN_ERR "PM: Some devices failed to suspend\n");
goto Resume_console;
}
if (suspend_test(TEST_DEVICES))
goto Resume_devices;
if (suspend_ops->prepare) {
error = suspend_ops->prepare();
if (error)
goto Resume_devices;
}
if (suspend_test(TEST_PLATFORM))
goto Finish;
error = disable_nonboot_cpus();
if (!error)
if (!error && !suspend_test(TEST_CPUS))
suspend_enter(state);
enable_nonboot_cpus();
Finish:
if (suspend_ops->finish)
suspend_ops->finish();
Resume_devices:
device_resume();
Resume_console:
resume_console();
Close:
if (suspend_ops->end)
suspend_ops->end();
return error;
}
@ -194,9 +308,9 @@ int suspend_devices_and_enter(suspend_state_t state)
*/
static void suspend_finish(void)
{
thaw_processes();
pm_restore_console();
suspend_thaw_processes();
pm_notifier_call_chain(PM_POST_SUSPEND);
pm_restore_console();
}
@ -238,17 +352,22 @@ static int enter_state(suspend_state_t state)
if (!mutex_trylock(&pm_mutex))
return -EBUSY;
printk("Syncing filesystems ... ");
printk(KERN_INFO "PM: Syncing filesystems ... ");
sys_sync();
printk("done.\n");
pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
if ((error = suspend_prepare()))
error = suspend_prepare();
if (error)
goto Unlock;
if (suspend_test(TEST_FREEZER))
goto Finish;
pr_debug("PM: Entering %s sleep\n", pm_states[state]);
error = suspend_devices_and_enter(state);
Finish:
pr_debug("PM: Finishing wakeup.\n");
suspend_finish();
Unlock:
@ -369,18 +488,18 @@ pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr,
}
power_attr(pm_trace);
#endif /* CONFIG_PM_TRACE */
static struct attribute * g[] = {
&state_attr.attr,
#ifdef CONFIG_PM_TRACE
&pm_trace_attr.attr,
#endif
#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG)
&pm_test_attr.attr,
#endif
NULL,
};
#else
static struct attribute * g[] = {
&state_attr.attr,
NULL,
};
#endif /* CONFIG_PM_TRACE */
static struct attribute_group attr_group = {
.attrs = g,

90
kernel/power/power.h
View File

@ -1,5 +1,7 @@
#include <linux/suspend.h>
#include <linux/suspend_ioctls.h>
#include <linux/utsname.h>
#include <linux/freezer.h>
struct swsusp_info {
struct new_utsname uts;
@ -128,42 +130,12 @@ struct snapshot_handle {
#define data_of(handle) ((handle).buffer + (handle).buf_offset)
extern unsigned int snapshot_additional_pages(struct zone *zone);
extern unsigned long snapshot_get_image_size(void);
extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
extern void snapshot_write_finalize(struct snapshot_handle *handle);
extern int snapshot_image_loaded(struct snapshot_handle *handle);
/*
* This structure is used to pass the values needed for the identification
* of the resume swap area from a user space to the kernel via the
* SNAPSHOT_SET_SWAP_AREA ioctl
*/
struct resume_swap_area {
loff_t offset;
u_int32_t dev;
} __attribute__((packed));
#define SNAPSHOT_IOC_MAGIC '3'
#define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
#define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
#define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
#define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
#define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
#define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
#define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
#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_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
#define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
#define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \
struct resume_swap_area)
#define SNAPSHOT_IOC_MAXNR 13
#define PMOPS_PREPARE 1
#define PMOPS_ENTER 2
#define PMOPS_FINISH 3
/* If unset, the snapshot device cannot be open. */
extern atomic_t snapshot_device_available;
@ -181,7 +153,6 @@ extern int swsusp_swap_in_use(void);
extern int swsusp_check(void);
extern int swsusp_shrink_memory(void);
extern void swsusp_free(void);
extern int swsusp_resume(void);
extern int swsusp_read(unsigned int *flags_p);
extern int swsusp_write(unsigned int flags);
extern void swsusp_close(void);
@ -201,11 +172,56 @@ static inline int suspend_devices_and_enter(suspend_state_t state)
}
#endif /* !CONFIG_SUSPEND */
/* kernel/power/common.c */
extern struct blocking_notifier_head pm_chain_head;
#ifdef CONFIG_PM_SLEEP
/* kernel/power/main.c */
extern int pm_notifier_call_chain(unsigned long val);
#endif
static inline int pm_notifier_call_chain(unsigned long val)
#ifdef CONFIG_HIGHMEM
unsigned int count_highmem_pages(void);
int restore_highmem(void);
#else
static inline unsigned int count_highmem_pages(void) { return 0; }
static inline int restore_highmem(void) { return 0; }
#endif
/*
* Suspend test levels
*/
enum {
/* keep first */
TEST_NONE,
TEST_CORE,
TEST_CPUS,
TEST_PLATFORM,
TEST_DEVICES,
TEST_FREEZER,
/* keep last */
__TEST_AFTER_LAST
};
#define TEST_FIRST TEST_NONE
#define TEST_MAX (__TEST_AFTER_LAST - 1)
extern int pm_test_level;
#ifdef CONFIG_SUSPEND_FREEZER
static inline int suspend_freeze_processes(void)
{
return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
== NOTIFY_BAD) ? -EINVAL : 0;
return freeze_processes();
}
static inline void suspend_thaw_processes(void)
{
thaw_processes();
}
#else
static inline int suspend_freeze_processes(void)
{
return 0;
}
static inline void suspend_thaw_processes(void)
{
}
#endif

31
kernel/power/snapshot.c
View File

@ -635,7 +635,7 @@ __register_nosave_region(unsigned long start_pfn, unsigned long end_pfn,
region->end_pfn = end_pfn;
list_add_tail(&region->list, &nosave_regions);
Report:
printk("swsusp: Registered nosave memory region: %016lx - %016lx\n",
printk(KERN_INFO "PM: Registered nosave memory: %016lx - %016lx\n",
start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
}
@ -704,7 +704,7 @@ static void mark_nosave_pages(struct memory_bitmap *bm)
list_for_each_entry(region, &nosave_regions, list) {
unsigned long pfn;
printk("swsusp: Marking nosave pages: %016lx - %016lx\n",
pr_debug("PM: Marking nosave pages: %016lx - %016lx\n",
region->start_pfn << PAGE_SHIFT,
region->end_pfn << PAGE_SHIFT);
@ -749,7 +749,7 @@ int create_basic_memory_bitmaps(void)
free_pages_map = bm2;
mark_nosave_pages(forbidden_pages_map);
printk("swsusp: Basic memory bitmaps created\n");
pr_debug("PM: Basic memory bitmaps created\n");
return 0;
@ -784,7 +784,7 @@ void free_basic_memory_bitmaps(void)
memory_bm_free(bm2, PG_UNSAFE_CLEAR);
kfree(bm2);
printk("swsusp: Basic memory bitmaps freed\n");
pr_debug("PM: Basic memory bitmaps freed\n");
}
/**
@ -872,7 +872,6 @@ unsigned int count_highmem_pages(void)
}
#else
static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
static inline unsigned int count_highmem_pages(void) { return 0; }
#endif /* CONFIG_HIGHMEM */
/**
@ -1089,7 +1088,7 @@ static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem)
}
nr_pages += count_pages_for_highmem(nr_highmem);
pr_debug("swsusp: Normal pages needed: %u + %u + %u, available pages: %u\n",
pr_debug("PM: Normal pages needed: %u + %u + %u, available pages: %u\n",
nr_pages, PAGES_FOR_IO, meta, free);
return free > nr_pages + PAGES_FOR_IO + meta;
@ -1202,20 +1201,20 @@ asmlinkage int swsusp_save(void)
{
unsigned int nr_pages, nr_highmem;
printk("swsusp: critical section: \n");
printk(KERN_INFO "PM: Creating hibernation image: \n");
drain_local_pages();
nr_pages = count_data_pages();
nr_highmem = count_highmem_pages();
printk("swsusp: Need to copy %u pages\n", nr_pages + nr_highmem);
printk(KERN_INFO "PM: Need to copy %u pages\n", nr_pages + nr_highmem);
if (!enough_free_mem(nr_pages, nr_highmem)) {
printk(KERN_ERR "swsusp: Not enough free memory\n");
printk(KERN_ERR "PM: Not enough free memory\n");
return -ENOMEM;
}
if (swsusp_alloc(&orig_bm, &copy_bm, nr_pages, nr_highmem)) {
printk(KERN_ERR "swsusp: Memory allocation failed\n");
printk(KERN_ERR "PM: Memory allocation failed\n");
return -ENOMEM;
}
@ -1235,7 +1234,8 @@ asmlinkage int swsusp_save(void)
nr_copy_pages = nr_pages;
nr_meta_pages = DIV_ROUND_UP(nr_pages * sizeof(long), PAGE_SIZE);
printk("swsusp: critical section: done (%d pages copied)\n", nr_pages);
printk(KERN_INFO "PM: Hibernation image created (%d pages copied)\n",
nr_pages);
return 0;
}
@ -1264,12 +1264,17 @@ static char *check_image_kernel(struct swsusp_info *info)
}
#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
unsigned long snapshot_get_image_size(void)
{
return nr_copy_pages + nr_meta_pages + 1;
}
static int init_header(struct swsusp_info *info)
{
memset(info, 0, sizeof(struct swsusp_info));
info->num_physpages = num_physpages;
info->image_pages = nr_copy_pages;
info->pages = nr_copy_pages + nr_meta_pages + 1;
info->pages = snapshot_get_image_size();
info->size = info->pages;
info->size <<= PAGE_SHIFT;
return init_header_complete(info);
@ -1429,7 +1434,7 @@ static int check_header(struct swsusp_info *info)
if (!reason && info->num_physpages != num_physpages)
reason = "memory size";
if (reason) {
printk(KERN_ERR "swsusp: Resume mismatch: %s\n", reason);
printk(KERN_ERR "PM: Image mismatch: %s\n", reason);
return -EPERM;
}
return 0;

33
kernel/power/swap.c
View File

@ -28,8 +28,6 @@
#include "power.h"
extern char resume_file[];
#define SWSUSP_SIG "S1SUSPEND"
struct swsusp_header {
@ -73,7 +71,8 @@ static int submit(int rw, pgoff_t page_off, struct page *page,
bio->bi_end_io = end_swap_bio_read;
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
printk("swsusp: ERROR: adding page to bio at %ld\n", page_off);
printk(KERN_ERR "PM: Adding page to bio failed at %ld\n",
page_off);
bio_put(bio);
return -EFAULT;
}
@ -153,7 +152,7 @@ static int mark_swapfiles(sector_t start, unsigned int flags)
error = bio_write_page(swsusp_resume_block,
swsusp_header, NULL);
} else {
printk(KERN_ERR "swsusp: Swap header not found!\n");
printk(KERN_ERR "PM: Swap header not found!\n");
error = -ENODEV;
}
return error;
@ -325,7 +324,8 @@ static int save_image(struct swap_map_handle *handle,
struct timeval start;
struct timeval stop;
printk("Saving image data pages (%u pages) ... ", nr_to_write);
printk(KERN_INFO "PM: Saving image data pages (%u pages) ... ",
nr_to_write);
m = nr_to_write / 100;
if (!m)
m = 1;
@ -365,7 +365,7 @@ static int enough_swap(unsigned int nr_pages)
{
unsigned int free_swap = count_swap_pages(root_swap, 1);
pr_debug("swsusp: free swap pages: %u\n", free_swap);
pr_debug("PM: Free swap pages: %u\n", free_swap);
return free_swap > nr_pages + PAGES_FOR_IO;
}
@ -388,7 +388,7 @@ int swsusp_write(unsigned int flags)
error = swsusp_swap_check();
if (error) {
printk(KERN_ERR "swsusp: Cannot find swap device, try "
printk(KERN_ERR "PM: Cannot find swap device, try "
"swapon -a.\n");
return error;
}
@ -402,7 +402,7 @@ int swsusp_write(unsigned int flags)
}
header = (struct swsusp_info *)data_of(snapshot);
if (!enough_swap(header->pages)) {
printk(KERN_ERR "swsusp: Not enough free swap\n");
printk(KERN_ERR "PM: Not enough free swap\n");
error = -ENOSPC;
goto out;
}
@ -417,7 +417,7 @@ int swsusp_write(unsigned int flags)
if (!error) {
flush_swap_writer(&handle);
printk("S");
printk(KERN_INFO "PM: S");
error = mark_swapfiles(start, flags);
printk("|\n");
}
@ -507,7 +507,8 @@ static int load_image(struct swap_map_handle *handle,
int err2;
unsigned nr_pages;
printk("Loading image data pages (%u pages) ... ", nr_to_read);
printk(KERN_INFO "PM: Loading image data pages (%u pages) ... ",
nr_to_read);
m = nr_to_read / 100;
if (!m)
m = 1;
@ -558,7 +559,7 @@ int swsusp_read(unsigned int *flags_p)
*flags_p = swsusp_header->flags;
if (IS_ERR(resume_bdev)) {
pr_debug("swsusp: block device not initialised\n");
pr_debug("PM: Image device not initialised\n");
return PTR_ERR(resume_bdev);
}
@ -577,9 +578,9 @@ int swsusp_read(unsigned int *flags_p)
blkdev_put(resume_bdev);
if (!error)
pr_debug("swsusp: Reading resume file was successful\n");
pr_debug("PM: Image successfully loaded\n");
else
pr_debug("swsusp: Error %d resuming\n", error);
pr_debug("PM: Error %d resuming\n", error);
return error;
}
@ -611,13 +612,13 @@ int swsusp_check(void)
if (error)
blkdev_put(resume_bdev);
else
pr_debug("swsusp: Signature found, resuming\n");
pr_debug("PM: Signature found, resuming\n");
} else {
error = PTR_ERR(resume_bdev);
}
if (error)
pr_debug("swsusp: Error %d check for resume file\n", error);
pr_debug("PM: Error %d checking image file\n", error);
return error;
}
@ -629,7 +630,7 @@ int swsusp_check(void)
void swsusp_close(void)
{
if (IS_ERR(resume_bdev)) {
pr_debug("swsusp: block device not initialised\n");
pr_debug("PM: Image device not initialised\n");
return;
}

48
kernel/power/swsusp.c
View File

@ -64,14 +64,6 @@ unsigned long image_size = 500 * 1024 * 1024;
int in_suspend __nosavedata = 0;
#ifdef CONFIG_HIGHMEM
unsigned int count_highmem_pages(void);
int restore_highmem(void);
#else
static inline int restore_highmem(void) { return 0; }
static inline unsigned int count_highmem_pages(void) { return 0; }
#endif
/**
* The following functions are used for tracing the allocated
* swap pages, so that they can be freed in case of an error.
@ -196,7 +188,8 @@ void swsusp_show_speed(struct timeval *start, struct timeval *stop,
centisecs = 1; /* avoid div-by-zero */
k = nr_pages * (PAGE_SIZE / 1024);
kps = (k * 100) / centisecs;
printk("%s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", msg, k,
printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n",
msg, k,
centisecs / 100, centisecs % 100,
kps / 1000, (kps % 1000) / 10);
}
@ -227,7 +220,7 @@ int swsusp_shrink_memory(void)
char *p = "-\\|/";
struct timeval start, stop;
printk("Shrinking memory... ");
printk(KERN_INFO "PM: Shrinking memory... ");
do_gettimeofday(&start);
do {
long size, highmem_size;
@ -269,38 +262,3 @@ int swsusp_shrink_memory(void)
return 0;
}
int swsusp_resume(void)
{
int error;
local_irq_disable();
/* NOTE: device_power_down() is just a suspend() with irqs off;
* it has no special "power things down" semantics
*/
if (device_power_down(PMSG_PRETHAW))
printk(KERN_ERR "Some devices failed to power down, very bad\n");
/* We'll ignore saved state, but this gets preempt count (etc) right */
save_processor_state();
error = restore_highmem();
if (!error) {
error = swsusp_arch_resume();
/* The code below is only ever reached in case of a failure.
* Otherwise execution continues at place where
* swsusp_arch_suspend() was called
*/
BUG_ON(!error);
/* This call to restore_highmem() undos the previous one */
restore_highmem();
}
/* The only reason why swsusp_arch_resume() can fail is memory being
* very tight, so we have to free it as soon as we can to avoid
* subsequent failures
*/
swsusp_free();
restore_processor_state();
touch_softlockup_watchdog();
device_power_up();
local_irq_enable();
return error;
}

109
kernel/power/user.c
View File

@ -28,6 +28,29 @@
#include "power.h"
/*
* NOTE: The SNAPSHOT_SET_SWAP_FILE and SNAPSHOT_PMOPS ioctls are obsolete and
* will be removed in the future. They are only preserved here for
* compatibility with existing userland utilities.
*/
#define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
#define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
#define PMOPS_PREPARE 1
#define PMOPS_ENTER 2
#define PMOPS_FINISH 3
/*
* NOTE: The following ioctl definitions are wrong and have been replaced with
* correct ones. They are only preserved here for compatibility with existing
* userland utilities and will be removed in the future.
*/
#define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
#define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
#define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
#define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
#define SNAPSHOT_MINOR 231
static struct snapshot_data {
@ -36,7 +59,7 @@ static struct snapshot_data {
int mode;
char frozen;
char ready;
char platform_suspend;
char platform_support;
} snapshot_state;
atomic_t snapshot_device_available = ATOMIC_INIT(1);
@ -44,6 +67,7 @@ atomic_t snapshot_device_available = ATOMIC_INIT(1);
static int snapshot_open(struct inode *inode, struct file *filp)
{
struct snapshot_data *data;
int error;
if (!atomic_add_unless(&snapshot_device_available, -1, 0))
return -EBUSY;
@ -64,13 +88,23 @@ static int snapshot_open(struct inode *inode, struct file *filp)
data->swap = swsusp_resume_device ?
swap_type_of(swsusp_resume_device, 0, NULL) : -1;
data->mode = O_RDONLY;
error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
if (error)
pm_notifier_call_chain(PM_POST_RESTORE);
} else {
data->swap = -1;
data->mode = O_WRONLY;
error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
if (error)
pm_notifier_call_chain(PM_POST_HIBERNATION);
}
if (error) {
atomic_inc(&snapshot_device_available);
return error;
}
data->frozen = 0;
data->ready = 0;
data->platform_suspend = 0;
data->platform_support = 0;
return 0;
}
@ -88,6 +122,8 @@ static int snapshot_release(struct inode *inode, struct file *filp)
thaw_processes();
mutex_unlock(&pm_mutex);
}
pm_notifier_call_chain(data->mode == O_WRONLY ?
PM_POST_HIBERNATION : PM_POST_RESTORE);
atomic_inc(&snapshot_device_available);
return 0;
}
@ -133,7 +169,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
{
int error = 0;
struct snapshot_data *data;
loff_t avail;
loff_t size;
sector_t offset;
if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
@ -151,18 +187,13 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
if (data->frozen)
break;
mutex_lock(&pm_mutex);
error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
if (!error) {
printk("Syncing filesystems ... ");
sys_sync();
printk("done.\n");
printk("Syncing filesystems ... ");
sys_sync();
printk("done.\n");
error = freeze_processes();
if (error)
thaw_processes();
}
error = freeze_processes();
if (error)
pm_notifier_call_chain(PM_POST_HIBERNATION);
thaw_processes();
mutex_unlock(&pm_mutex);
if (!error)
data->frozen = 1;
@ -173,19 +204,19 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
break;
mutex_lock(&pm_mutex);
thaw_processes();
pm_notifier_call_chain(PM_POST_HIBERNATION);
mutex_unlock(&pm_mutex);
data->frozen = 0;
break;
case SNAPSHOT_CREATE_IMAGE:
case SNAPSHOT_ATOMIC_SNAPSHOT:
if (data->mode != O_RDONLY || !data->frozen || data->ready) {
error = -EPERM;
break;
}
error = hibernation_snapshot(data->platform_suspend);
error = hibernation_snapshot(data->platform_support);
if (!error)
error = put_user(in_suspend, (unsigned int __user *)arg);
error = put_user(in_suspend, (int __user *)arg);
if (!error)
data->ready = 1;
break;
@ -197,7 +228,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
error = -EPERM;
break;
}
error = hibernation_restore(data->platform_suspend);
error = hibernation_restore(data->platform_support);
break;
case SNAPSHOT_FREE:
@ -206,16 +237,29 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
data->ready = 0;
break;
case SNAPSHOT_PREF_IMAGE_SIZE:
case SNAPSHOT_SET_IMAGE_SIZE:
image_size = arg;
break;
case SNAPSHOT_AVAIL_SWAP:
avail = count_swap_pages(data->swap, 1);
avail <<= PAGE_SHIFT;
error = put_user(avail, (loff_t __user *)arg);
case SNAPSHOT_GET_IMAGE_SIZE:
if (!data->ready) {
error = -ENODATA;
break;
}
size = snapshot_get_image_size();
size <<= PAGE_SHIFT;
error = put_user(size, (loff_t __user *)arg);
break;
case SNAPSHOT_AVAIL_SWAP_SIZE:
case SNAPSHOT_AVAIL_SWAP:
size = count_swap_pages(data->swap, 1);
size <<= PAGE_SHIFT;
error = put_user(size, (loff_t __user *)arg);
break;
case SNAPSHOT_ALLOC_SWAP_PAGE:
case SNAPSHOT_GET_SWAP_PAGE:
if (data->swap < 0 || data->swap >= MAX_SWAPFILES) {
error = -ENODEV;
@ -224,7 +268,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
offset = alloc_swapdev_block(data->swap);
if (offset) {
offset <<= PAGE_SHIFT;
error = put_user(offset, (sector_t __user *)arg);
error = put_user(offset, (loff_t __user *)arg);
} else {
error = -ENOSPC;
}
@ -238,7 +282,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
free_all_swap_pages(data->swap);
break;
case SNAPSHOT_SET_SWAP_FILE:
case SNAPSHOT_SET_SWAP_FILE: /* This ioctl is deprecated */
if (!swsusp_swap_in_use()) {
/*
* User space encodes device types as two-byte values,
@ -275,26 +319,33 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
mutex_unlock(&pm_mutex);
break;
case SNAPSHOT_PMOPS:
case SNAPSHOT_PLATFORM_SUPPORT:
data->platform_support = !!arg;
break;
case SNAPSHOT_POWER_OFF:
if (data->platform_support)
error = hibernation_platform_enter();
break;
case SNAPSHOT_PMOPS: /* This ioctl is deprecated */
error = -EINVAL;
switch (arg) {
case PMOPS_PREPARE:
data->platform_suspend = 1;
data->platform_support = 1;
error = 0;
break;
case PMOPS_ENTER:
if (data->platform_suspend)
if (data->platform_support)
error = hibernation_platform_enter();
break;
case PMOPS_FINISH:
if (data->platform_suspend)
if (data->platform_support)
error = 0;
break;
default: