2005-04-17 05:20:36 +07:00
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/*
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* kernel/power/main.c - PM subsystem core functionality.
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*
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* Copyright (c) 2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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*
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* This file is released under the GPLv2
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*
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*/
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#include <linux/kobject.h>
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#include <linux/string.h>
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2006-09-26 13:32:58 +07:00
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#include <linux/resume-trace.h>
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2009-08-19 04:38:32 +07:00
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#include <linux/workqueue.h>
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2005-04-17 05:20:36 +07:00
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#include "power.h"
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2006-12-07 11:34:35 +07:00
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DEFINE_MUTEX(pm_mutex);
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2005-04-17 05:20:36 +07:00
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2007-12-14 05:38:03 +07:00
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unsigned int pm_flags;
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EXPORT_SYMBOL(pm_flags);
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2007-11-20 05:49:18 +07:00
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#ifdef CONFIG_PM_SLEEP
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/* Routines for PM-transition notifications */
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static BLOCKING_NOTIFIER_HEAD(pm_chain_head);
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int register_pm_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&pm_chain_head, nb);
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}
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EXPORT_SYMBOL_GPL(register_pm_notifier);
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int unregister_pm_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&pm_chain_head, nb);
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}
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EXPORT_SYMBOL_GPL(unregister_pm_notifier);
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int pm_notifier_call_chain(unsigned long val)
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{
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return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
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== NOTIFY_BAD) ? -EINVAL : 0;
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}
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2010-01-24 04:25:15 +07:00
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/* If set, devices may be suspended and resumed asynchronously. */
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int pm_async_enabled = 1;
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static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%d\n", pm_async_enabled);
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}
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static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t n)
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{
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unsigned long val;
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if (strict_strtoul(buf, 10, &val))
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return -EINVAL;
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if (val > 1)
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return -EINVAL;
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pm_async_enabled = val;
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return n;
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}
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power_attr(pm_async);
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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>
2007-11-20 05:41:19 +07:00
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#ifdef CONFIG_PM_DEBUG
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int pm_test_level = TEST_NONE;
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static const char * const pm_tests[__TEST_AFTER_LAST] = {
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[TEST_NONE] = "none",
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[TEST_CORE] = "core",
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[TEST_CPUS] = "processors",
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[TEST_PLATFORM] = "platform",
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[TEST_DEVICES] = "devices",
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[TEST_FREEZER] = "freezer",
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};
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2008-01-29 06:29:06 +07:00
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static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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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>
2007-11-20 05:41:19 +07:00
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{
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char *s = buf;
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int level;
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for (level = TEST_FIRST; level <= TEST_MAX; level++)
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if (pm_tests[level]) {
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if (level == pm_test_level)
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s += sprintf(s, "[%s] ", pm_tests[level]);
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else
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s += sprintf(s, "%s ", pm_tests[level]);
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}
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if (s != buf)
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/* convert the last space to a newline */
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*(s-1) = '\n';
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return (s - buf);
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}
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2008-01-29 06:29:06 +07:00
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static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t n)
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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>
2007-11-20 05:41:19 +07:00
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{
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const char * const *s;
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int level;
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char *p;
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int len;
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int error = -EINVAL;
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p = memchr(buf, '\n', n);
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len = p ? p - buf : n;
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mutex_lock(&pm_mutex);
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level = TEST_FIRST;
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for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++)
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if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) {
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pm_test_level = level;
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error = 0;
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break;
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}
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mutex_unlock(&pm_mutex);
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return error ? error : n;
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}
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power_attr(pm_test);
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2009-01-17 06:10:45 +07:00
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#endif /* CONFIG_PM_DEBUG */
|
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>
2007-11-20 05:41:19 +07:00
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2007-12-14 07:07:13 +07:00
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#endif /* CONFIG_PM_SLEEP */
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2008-01-29 06:29:06 +07:00
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2007-11-28 02:28:26 +07:00
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struct kobject *power_kobj;
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2005-04-17 05:20:36 +07:00
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/**
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* state - control system power state.
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*
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* show() returns what states are supported, which is hard-coded to
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* 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and
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* 'disk' (Suspend-to-Disk).
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*
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* store() accepts one of those strings, translates it into the
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* proper enumerated value, and initiates a suspend transition.
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*/
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2007-11-02 19:47:53 +07:00
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static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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2005-04-17 05:20:36 +07:00
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{
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2007-07-30 04:27:18 +07:00
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char *s = buf;
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#ifdef CONFIG_SUSPEND
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2005-04-17 05:20:36 +07:00
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int i;
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for (i = 0; i < PM_SUSPEND_MAX; i++) {
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2005-11-30 10:34:37 +07:00
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if (pm_states[i] && valid_state(i))
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s += sprintf(s,"%s ", pm_states[i]);
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2005-04-17 05:20:36 +07:00
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}
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2007-07-30 04:27:18 +07:00
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#endif
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2007-07-30 04:24:36 +07:00
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#ifdef CONFIG_HIBERNATION
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2007-05-09 16:33:18 +07:00
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s += sprintf(s, "%s\n", "disk");
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#else
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if (s != buf)
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/* convert the last space to a newline */
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*(s-1) = '\n';
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#endif
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2005-04-17 05:20:36 +07:00
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return (s - buf);
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}
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2007-11-02 19:47:53 +07:00
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static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t n)
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2005-04-17 05:20:36 +07:00
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{
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2007-07-30 04:27:18 +07:00
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#ifdef CONFIG_SUSPEND
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2005-04-17 05:20:36 +07:00
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suspend_state_t state = PM_SUSPEND_STANDBY;
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2006-06-25 19:47:56 +07:00
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const char * const *s;
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2007-07-30 04:27:18 +07:00
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#endif
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2005-04-17 05:20:36 +07:00
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char *p;
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int len;
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2007-07-30 04:27:18 +07:00
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int error = -EINVAL;
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2005-04-17 05:20:36 +07:00
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p = memchr(buf, '\n', n);
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len = p ? p - buf : n;
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2007-05-09 16:33:18 +07:00
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/* First, check if we are requested to hibernate */
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2007-05-17 12:11:19 +07:00
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if (len == 4 && !strncmp(buf, "disk", len)) {
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2007-05-09 16:33:18 +07:00
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error = hibernate();
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2007-07-30 04:27:18 +07:00
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goto Exit;
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2007-05-09 16:33:18 +07:00
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}
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2007-07-30 04:27:18 +07:00
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#ifdef CONFIG_SUSPEND
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2005-04-17 05:20:36 +07:00
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for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
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2007-05-17 12:11:19 +07:00
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if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
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2005-04-17 05:20:36 +07:00
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break;
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}
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2006-04-28 08:39:17 +07:00
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if (state < PM_SUSPEND_MAX && *s)
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2005-04-17 05:20:36 +07:00
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error = enter_state(state);
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2007-07-30 04:27:18 +07:00
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#endif
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Exit:
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2005-04-17 05:20:36 +07:00
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return error ? error : n;
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}
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power_attr(state);
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2006-09-26 13:32:58 +07:00
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#ifdef CONFIG_PM_TRACE
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int pm_trace_enabled;
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2007-11-02 19:47:53 +07:00
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static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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2006-09-26 13:32:58 +07:00
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{
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return sprintf(buf, "%d\n", pm_trace_enabled);
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}
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static ssize_t
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2007-11-02 19:47:53 +07:00
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pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t n)
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2006-09-26 13:32:58 +07:00
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{
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int val;
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if (sscanf(buf, "%d", &val) == 1) {
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pm_trace_enabled = !!val;
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return n;
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}
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return -EINVAL;
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}
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power_attr(pm_trace);
|
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>
2007-11-20 05:41:19 +07:00
|
|
|
#endif /* CONFIG_PM_TRACE */
|
2006-09-26 13:32:58 +07:00
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static struct attribute * g[] = {
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&state_attr.attr,
|
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>
2007-11-20 05:41:19 +07:00
|
|
|
#ifdef CONFIG_PM_TRACE
|
2006-09-26 13:32:58 +07:00
|
|
|
&pm_trace_attr.attr,
|
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>
2007-11-20 05:41:19 +07:00
|
|
|
#endif
|
2010-01-24 04:25:15 +07:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
&pm_async_attr.attr,
|
|
|
|
#ifdef CONFIG_PM_DEBUG
|
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>
2007-11-20 05:41:19 +07:00
|
|
|
&pm_test_attr.attr,
|
2010-01-24 04:25:15 +07:00
|
|
|
#endif
|
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>
2007-11-20 05:41:19 +07:00
|
|
|
#endif
|
2006-09-26 13:32:58 +07:00
|
|
|
NULL,
|
|
|
|
};
|
2005-04-17 05:20:36 +07:00
|
|
|
|
|
|
|
static struct attribute_group attr_group = {
|
|
|
|
.attrs = g,
|
|
|
|
};
|
|
|
|
|
2009-08-19 04:38:32 +07:00
|
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
|
|
struct workqueue_struct *pm_wq;
|
2009-12-04 02:22:21 +07:00
|
|
|
EXPORT_SYMBOL_GPL(pm_wq);
|
2009-08-19 04:38:32 +07:00
|
|
|
|
|
|
|
static int __init pm_start_workqueue(void)
|
|
|
|
{
|
|
|
|
pm_wq = create_freezeable_workqueue("pm");
|
|
|
|
|
|
|
|
return pm_wq ? 0 : -ENOMEM;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int pm_start_workqueue(void) { return 0; }
|
|
|
|
#endif
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
static int __init pm_init(void)
|
|
|
|
{
|
2009-08-19 04:38:32 +07:00
|
|
|
int error = pm_start_workqueue();
|
|
|
|
if (error)
|
|
|
|
return error;
|
2007-11-28 02:28:26 +07:00
|
|
|
power_kobj = kobject_create_and_add("power", NULL);
|
|
|
|
if (!power_kobj)
|
2007-11-02 00:39:50 +07:00
|
|
|
return -ENOMEM;
|
2007-11-28 02:28:26 +07:00
|
|
|
return sysfs_create_group(power_kobj, &attr_group);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
core_initcall(pm_init);
|