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author | Rafael J. Wysocki <rjw@sisk.pl> | 2007-11-19 22:41:19 (GMT) |
---|---|---|
committer | Len Brown <len.brown@intel.com> | 2008-02-01 23:30:54 (GMT) |
commit | 0e7d56e3d9d7e37c79d0e05ffb3994e34beb3bbc (patch) | |
tree | cac3e72f882085bc869df9302248a079c657bb10 /kernel/power/power.h | |
parent | c3e94d899c864e558f938f9845ddb8c2e5d5ccd0 (diff) | |
download | linux-0e7d56e3d9d7e37c79d0e05ffb3994e34beb3bbc.tar.xz |
Suspend: Testing facility (rev. 2)
Introduce sysfs attribute /sys/power/pm_test allowing one to test the suspend
core code. Namely, writing one of the strings:
freezer
devices
platform
processors
core
to this file causes the suspend code to work in one of the test modes defined as
follows:
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
(*) These are ACPI global control methods on ACPI systems
Then, if a suspend is started by normal means, the suspend core will perform
its normal operations up to the point indicated by given test level. Next, it
will wait for 5 seconds and carry out the resume operations needed to transition
the system back to the fully functional state.
Writing "none" to /sys/power/pm_test turns the testing off.
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.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'kernel/power/power.h')
-rw-r--r-- | kernel/power/power.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h index c5321eb..9f9e16e 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -188,3 +188,21 @@ int restore_highmem(void); 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) |