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Merge branches 'pm-runtime' and 'pm-sleep'

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* pm-runtime:
  PM / Runtime: Update runtime_idle() documentation for return value meaning

* pm-sleep:
  PM / sleep: Correct whitespace errors in <linux/pm.h>
  PM: Add missing "freeze" state
  PM / Hibernate: Spelling s/anonymouns/anonymous/
  PM / Runtime: Add missing "it" in comment
  PM / suspend: Remove unnecessary !!
  PCI / PM: Resume runtime-suspended devices later during system suspend
  ACPI / PM: Resume runtime-suspended devices later during system suspend
  PM / sleep: Set pm_generic functions to NULL for !CONFIG_PM_SLEEP
  PM: fix typo in comment
  PM / hibernate: use name_to_dev_t to parse resume
  PM / wakeup: Include appropriate header file in kernel/power/wakelock.c
  PM / sleep: Move prototype declaration to header file kernel/power/power.h
  PM / sleep: Asynchronous threads for suspend_late
  PM / sleep: Asynchronous threads for suspend_noirq
  PM / sleep: Asynchronous threads for resume_early
  PM / sleep: Asynchronous threads for resume_noirq
  PM / sleep: Two flags for async suspend_noirq and suspend_late
This commit is contained in:
Rafael J. Wysocki 2014-03-20 13:25:54 +01:00
commit 36cc86e8ec
12 changed files with 354 additions and 106 deletions
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5
Documentation/ABI/testing/sysfs-power
View file

@ -12,8 +12,9 @@ Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
Description:
The /sys/power/state file controls the system power state.
Reading from this file returns what states are supported,
which is hard-coded to 'standby' (Power-On Suspend), 'mem'
(Suspend-to-RAM), and 'disk' (Suspend-to-Disk).
which is hard-coded to 'freeze' (Low-Power Idle), 'standby'
(Power-On Suspend), 'mem' (Suspend-to-RAM), and 'disk'
(Suspend-to-Disk).
Writing to this file one of these strings causes the system to
transition into that state. Please see the file

41
drivers/acpi/device_pm.c
View file

@ -901,14 +901,29 @@ EXPORT_SYMBOL_GPL(acpi_dev_resume_early);
int acpi_subsys_prepare(struct device *dev)
{
/*
* Follow PCI and resume devices suspended at run time before running
* their system suspend callbacks.
* Devices having power.ignore_children set may still be necessary for
* suspending their children in the next phase of device suspend.
*/
pm_runtime_resume(dev);
if (dev->power.ignore_children)
pm_runtime_resume(dev);
return pm_generic_prepare(dev);
}
EXPORT_SYMBOL_GPL(acpi_subsys_prepare);
/**
* acpi_subsys_suspend - Run the device driver's suspend callback.
* @dev: Device to handle.
*
* Follow PCI and resume devices suspended at run time before running their
* system suspend callbacks.
*/
int acpi_subsys_suspend(struct device *dev)
{
pm_runtime_resume(dev);
return pm_generic_suspend(dev);
}
/**
* acpi_subsys_suspend_late - Suspend device using ACPI.
* @dev: Device to suspend.
@ -937,6 +952,23 @@ int acpi_subsys_resume_early(struct device *dev)
return ret ? ret : pm_generic_resume_early(dev);
}
EXPORT_SYMBOL_GPL(acpi_subsys_resume_early);
/**
* acpi_subsys_freeze - Run the device driver's freeze callback.
* @dev: Device to handle.
*/
int acpi_subsys_freeze(struct device *dev)
{
/*
* This used to be done in acpi_subsys_prepare() for all devices and
* some drivers may depend on it, so do it here. Ideally, however,
* runtime-suspended devices should not be touched during freeze/thaw
* transitions.
*/
pm_runtime_resume(dev);
return pm_generic_freeze(dev);
}
#endif /* CONFIG_PM_SLEEP */
static struct dev_pm_domain acpi_general_pm_domain = {
@ -947,8 +979,11 @@ static struct dev_pm_domain acpi_general_pm_domain = {
#endif
#ifdef CONFIG_PM_SLEEP
.prepare = acpi_subsys_prepare,
.suspend = acpi_subsys_suspend,
.suspend_late = acpi_subsys_suspend_late,
.resume_early = acpi_subsys_resume_early,
.freeze = acpi_subsys_freeze,
.poweroff = acpi_subsys_suspend,
.poweroff_late = acpi_subsys_suspend_late,
.restore_early = acpi_subsys_resume_early,
#endif

275
drivers/base/power/main.c
View file

@ -91,6 +91,8 @@ void device_pm_sleep_init(struct device *dev)
{
dev->power.is_prepared = false;
dev->power.is_suspended = false;
dev->power.is_noirq_suspended = false;
dev->power.is_late_suspended = false;
init_completion(&dev->power.completion);
complete_all(&dev->power.completion);
dev->power.wakeup = NULL;
@ -467,7 +469,7 @@ static void dpm_watchdog_clear(struct dpm_watchdog *wd)
* The driver of @dev will not receive interrupts while this function is being
* executed.
*/
static int device_resume_noirq(struct device *dev, pm_message_t state)
static int device_resume_noirq(struct device *dev, pm_message_t state, bool async)
{
pm_callback_t callback = NULL;
char *info = NULL;
@ -479,6 +481,11 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
if (dev->power.syscore)
goto Out;
if (!dev->power.is_noirq_suspended)
goto Out;
dpm_wait(dev->parent, async);
if (dev->pm_domain) {
info = "noirq power domain ";
callback = pm_noirq_op(&dev->pm_domain->ops, state);
@ -499,12 +506,32 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
}
error = dpm_run_callback(callback, dev, state, info);
dev->power.is_noirq_suspended = false;
Out:
complete_all(&dev->power.completion);
TRACE_RESUME(error);
return error;
}
static bool is_async(struct device *dev)
{
return dev->power.async_suspend && pm_async_enabled
&& !pm_trace_is_enabled();
}
static void async_resume_noirq(void *data, async_cookie_t cookie)
{
struct device *dev = (struct device *)data;
int error;
error = device_resume_noirq(dev, pm_transition, true);
if (error)
pm_dev_err(dev, pm_transition, " async", error);
put_device(dev);
}
/**
* dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
* @state: PM transition of the system being carried out.
@ -514,29 +541,48 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
*/
static void dpm_resume_noirq(pm_message_t state)
{
struct device *dev;
ktime_t starttime = ktime_get();
mutex_lock(&dpm_list_mtx);
while (!list_empty(&dpm_noirq_list)) {
struct device *dev = to_device(dpm_noirq_list.next);
int error;
pm_transition = state;
/*
* Advanced the async threads upfront,
* in case the starting of async threads is
* delayed by non-async resuming devices.
*/
list_for_each_entry(dev, &dpm_noirq_list, power.entry) {
reinit_completion(&dev->power.completion);
if (is_async(dev)) {
get_device(dev);
async_schedule(async_resume_noirq, dev);
}
}
while (!list_empty(&dpm_noirq_list)) {
dev = to_device(dpm_noirq_list.next);
get_device(dev);
list_move_tail(&dev->power.entry, &dpm_late_early_list);
mutex_unlock(&dpm_list_mtx);
error = device_resume_noirq(dev, state);
if (error) {
suspend_stats.failed_resume_noirq++;
dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
dpm_save_failed_dev(dev_name(dev));
pm_dev_err(dev, state, " noirq", error);
if (!is_async(dev)) {
int error;
error = device_resume_noirq(dev, state, false);
if (error) {
suspend_stats.failed_resume_noirq++;
dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
dpm_save_failed_dev(dev_name(dev));
pm_dev_err(dev, state, " noirq", error);
}
}
mutex_lock(&dpm_list_mtx);
put_device(dev);
}
mutex_unlock(&dpm_list_mtx);
async_synchronize_full();
dpm_show_time(starttime, state, "noirq");
resume_device_irqs();
cpuidle_resume();
@ -549,7 +595,7 @@ static void dpm_resume_noirq(pm_message_t state)
*
* Runtime PM is disabled for @dev while this function is being executed.
*/
static int device_resume_early(struct device *dev, pm_message_t state)
static int device_resume_early(struct device *dev, pm_message_t state, bool async)
{
pm_callback_t callback = NULL;
char *info = NULL;
@ -561,6 +607,11 @@ static int device_resume_early(struct device *dev, pm_message_t state)
if (dev->power.syscore)
goto Out;
if (!dev->power.is_late_suspended)
goto Out;
dpm_wait(dev->parent, async);
if (dev->pm_domain) {
info = "early power domain ";
callback = pm_late_early_op(&dev->pm_domain->ops, state);
@ -581,43 +632,75 @@ static int device_resume_early(struct device *dev, pm_message_t state)
}
error = dpm_run_callback(callback, dev, state, info);
dev->power.is_late_suspended = false;
Out:
TRACE_RESUME(error);
pm_runtime_enable(dev);
complete_all(&dev->power.completion);
return error;
}
static void async_resume_early(void *data, async_cookie_t cookie)
{
struct device *dev = (struct device *)data;
int error;
error = device_resume_early(dev, pm_transition, true);
if (error)
pm_dev_err(dev, pm_transition, " async", error);
put_device(dev);
}
/**
* dpm_resume_early - Execute "early resume" callbacks for all devices.
* @state: PM transition of the system being carried out.
*/
static void dpm_resume_early(pm_message_t state)
{
struct device *dev;
ktime_t starttime = ktime_get();
mutex_lock(&dpm_list_mtx);
while (!list_empty(&dpm_late_early_list)) {
struct device *dev = to_device(dpm_late_early_list.next);
int error;
pm_transition = state;
/*
* Advanced the async threads upfront,
* in case the starting of async threads is
* delayed by non-async resuming devices.
*/
list_for_each_entry(dev, &dpm_late_early_list, power.entry) {
reinit_completion(&dev->power.completion);
if (is_async(dev)) {
get_device(dev);
async_schedule(async_resume_early, dev);
}
}
while (!list_empty(&dpm_late_early_list)) {
dev = to_device(dpm_late_early_list.next);
get_device(dev);
list_move_tail(&dev->power.entry, &dpm_suspended_list);
mutex_unlock(&dpm_list_mtx);
error = device_resume_early(dev, state);
if (error) {
suspend_stats.failed_resume_early++;
dpm_save_failed_step(SUSPEND_RESUME_EARLY);
dpm_save_failed_dev(dev_name(dev));
pm_dev_err(dev, state, " early", error);
}
if (!is_async(dev)) {
int error;
error = device_resume_early(dev, state, false);
if (error) {
suspend_stats.failed_resume_early++;
dpm_save_failed_step(SUSPEND_RESUME_EARLY);
dpm_save_failed_dev(dev_name(dev));
pm_dev_err(dev, state, " early", error);
}
}
mutex_lock(&dpm_list_mtx);
put_device(dev);
}
mutex_unlock(&dpm_list_mtx);
async_synchronize_full();
dpm_show_time(starttime, state, "early");
}
@ -732,12 +815,6 @@ static void async_resume(void *data, async_cookie_t cookie)
put_device(dev);
}
static bool is_async(struct device *dev)
{
return dev->power.async_suspend && pm_async_enabled
&& !pm_trace_is_enabled();
}
/**
* dpm_resume - Execute "resume" callbacks for non-sysdev devices.
* @state: PM transition of the system being carried out.
@ -913,13 +990,24 @@ static pm_message_t resume_event(pm_message_t sleep_state)
* The driver of @dev will not receive interrupts while this function is being
* executed.
*/
static int device_suspend_noirq(struct device *dev, pm_message_t state)
static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async)
{
pm_callback_t callback = NULL;
char *info = NULL;
int error = 0;
if (async_error)
goto Complete;
if (pm_wakeup_pending()) {
async_error = -EBUSY;
goto Complete;
}
if (dev->power.syscore)
return 0;
goto Complete;
dpm_wait_for_children(dev, async);
if (dev->pm_domain) {
info = "noirq power domain ";
@ -940,7 +1028,41 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
callback = pm_noirq_op(dev->driver->pm, state);
}
return dpm_run_callback(callback, dev, state, info);
error = dpm_run_callback(callback, dev, state, info);
if (!error)
dev->power.is_noirq_suspended = true;
else
async_error = error;
Complete:
complete_all(&dev->power.completion);
return error;
}
static void async_suspend_noirq(void *data, async_cookie_t cookie)
{
struct device *dev = (struct device *)data;
int error;
error = __device_suspend_noirq(dev, pm_transition, true);
if (error) {
dpm_save_failed_dev(dev_name(dev));
pm_dev_err(dev, pm_transition, " async", error);
}
put_device(dev);
}
static int device_suspend_noirq(struct device *dev)
{
reinit_completion(&dev->power.completion);
if (pm_async_enabled && dev->power.async_suspend) {
get_device(dev);
async_schedule(async_suspend_noirq, dev);
return 0;
}
return __device_suspend_noirq(dev, pm_transition, false);
}
/**
@ -958,19 +1080,20 @@ static int dpm_suspend_noirq(pm_message_t state)
cpuidle_pause();
suspend_device_irqs();
mutex_lock(&dpm_list_mtx);
pm_transition = state;
async_error = 0;
while (!list_empty(&dpm_late_early_list)) {
struct device *dev = to_device(dpm_late_early_list.prev);
get_device(dev);
mutex_unlock(&dpm_list_mtx);
error = device_suspend_noirq(dev, state);
error = device_suspend_noirq(dev);
mutex_lock(&dpm_list_mtx);
if (error) {
pm_dev_err(dev, state, " noirq", error);
suspend_stats.failed_suspend_noirq++;
dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
dpm_save_failed_dev(dev_name(dev));
put_device(dev);
break;
@ -979,16 +1102,21 @@ static int dpm_suspend_noirq(pm_message_t state)
list_move(&dev->power.entry, &dpm_noirq_list);
put_device(dev);
if (pm_wakeup_pending()) {
error = -EBUSY;
if (async_error)
break;
}
}
mutex_unlock(&dpm_list_mtx);
if (error)
async_synchronize_full();
if (!error)
error = async_error;
if (error) {
suspend_stats.failed_suspend_noirq++;
dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
dpm_resume_noirq(resume_event(state));
else
} else {
dpm_show_time(starttime, state, "noirq");
}
return error;
}
@ -999,15 +1127,26 @@ static int dpm_suspend_noirq(pm_message_t state)
*
* Runtime PM is disabled for @dev while this function is being executed.
*/
static int device_suspend_late(struct device *dev, pm_message_t state)
static int __device_suspend_late(struct device *dev, pm_message_t state, bool async)
{
pm_callback_t callback = NULL;
char *info = NULL;
int error = 0;
__pm_runtime_disable(dev, false);
if (async_error)
goto Complete;
if (pm_wakeup_pending()) {
async_error = -EBUSY;
goto Complete;
}
if (dev->power.syscore)
return 0;
goto Complete;
dpm_wait_for_children(dev, async);
if (dev->pm_domain) {
info = "late power domain ";
@ -1028,7 +1167,41 @@ static int device_suspend_late(struct device *dev, pm_message_t state)
callback = pm_late_early_op(dev->driver->pm, state);
}
return dpm_run_callback(callback, dev, state, info);
error = dpm_run_callback(callback, dev, state, info);
if (!error)
dev->power.is_late_suspended = true;
else
async_error = error;
Complete:
complete_all(&dev->power.completion);
return error;
}
static void async_suspend_late(void *data, async_cookie_t cookie)
{
struct device *dev = (struct device *)data;
int error;
error = __device_suspend_late(dev, pm_transition, true);
if (error) {
dpm_save_failed_dev(dev_name(dev));
pm_dev_err(dev, pm_transition, " async", error);
}
put_device(dev);
}
static int device_suspend_late(struct device *dev)
{
reinit_completion(&dev->power.completion);
if (pm_async_enabled && dev->power.async_suspend) {
get_device(dev);
async_schedule(async_suspend_late, dev);
return 0;
}
return __device_suspend_late(dev, pm_transition, false);
}
/**
@ -1041,19 +1214,20 @@ static int dpm_suspend_late(pm_message_t state)
int error = 0;
mutex_lock(&dpm_list_mtx);
pm_transition = state;
async_error = 0;
while (!list_empty(&dpm_suspended_list)) {
struct device *dev = to_device(dpm_suspended_list.prev);
get_device(dev);
mutex_unlock(&dpm_list_mtx);
error = device_suspend_late(dev, state);
error = device_suspend_late(dev);
mutex_lock(&dpm_list_mtx);
if (error) {
pm_dev_err(dev, state, " late", error);
suspend_stats.failed_suspend_late++;
dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
dpm_save_failed_dev(dev_name(dev));
put_device(dev);
break;
@ -1062,17 +1236,18 @@ static int dpm_suspend_late(pm_message_t state)
list_move(&dev->power.entry, &dpm_late_early_list);
put_device(dev);
if (pm_wakeup_pending()) {
error = -EBUSY;
if (async_error)
break;
}
}
mutex_unlock(&dpm_list_mtx);
if (error)
async_synchronize_full();
if (error) {
suspend_stats.failed_suspend_late++;
dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
dpm_resume_early(resume_event(state));
else
} else {
dpm_show_time(starttime, state, "late");
}
return error;
}

2
drivers/base/power/runtime.c
View file

@ -1131,7 +1131,7 @@ EXPORT_SYMBOL_GPL(pm_runtime_barrier);
* @dev: Device to handle.
* @check_resume: If set, check if there's a resume request for the device.
*
* Increment power.disable_depth for the device and if was zero previously,
* Increment power.disable_depth for the device and if it was zero previously,
* cancel all pending runtime PM requests for the device and wait for all
* operations in progress to complete. The device can be either active or
* suspended after its runtime PM has been disabled.

33
drivers/pci/pci-driver.c
View file

@ -616,15 +616,11 @@ static int pci_pm_prepare(struct device *dev)
int error = 0;
/*
* PCI devices suspended at run time need to be resumed at this
* point, because in general it is necessary to reconfigure them for
* system suspend. Namely, if the device is supposed to wake up the
* system from the sleep state, we may need to reconfigure it for this
* purpose. In turn, if the device is not supposed to wake up the
* system from the sleep state, we'll have to prevent it from signaling
* wake-up.
* Devices having power.ignore_children set may still be necessary for
* suspending their children in the next phase of device suspend.
*/
pm_runtime_resume(dev);
if (dev->power.ignore_children)
pm_runtime_resume(dev);
if (drv && drv->pm && drv->pm->prepare)
error = drv->pm->prepare(dev);
@ -654,6 +650,16 @@ static int pci_pm_suspend(struct device *dev)
goto Fixup;
}
/*
* PCI devices suspended at run time need to be resumed at this point,
* because in general it is necessary to reconfigure them for system
* suspend. Namely, if the device is supposed to wake up the system
* from the sleep state, we may need to reconfigure it for this purpose.
* In turn, if the device is not supposed to wake up the system from the
* sleep state, we'll have to prevent it from signaling wake-up.
*/
pm_runtime_resume(dev);
pci_dev->state_saved = false;
if (pm->suspend) {
pci_power_t prev = pci_dev->current_state;
@ -808,6 +814,14 @@ static int pci_pm_freeze(struct device *dev)
return 0;
}
/*
* This used to be done in pci_pm_prepare() for all devices and some
* drivers may depend on it, so do it here. Ideally, runtime-suspended
* devices should not be touched during freeze/thaw transitions,
* however.
*/
pm_runtime_resume(dev);
pci_dev->state_saved = false;
if (pm->freeze) {
int error;
@ -915,6 +929,9 @@ static int pci_pm_poweroff(struct device *dev)
goto Fixup;
}
/* The reason to do that is the same as in pci_pm_suspend(). */
pm_runtime_resume(dev);
pci_dev->state_saved = false;
if (pm->poweroff) {
int error;

70
include/linux/pm.h
View file

@ -264,9 +264,9 @@ typedef struct pm_message {
* registers, so that it is fully operational.
*
* @runtime_idle: Device appears to be inactive and it might be put into a
* low-power state if all of the necessary conditions are satisfied. Check
* these conditions and handle the device as appropriate, possibly queueing
* a suspend request for it. The return value is ignored by the PM core.
* low-power state if all of the necessary conditions are satisfied.
* Check these conditions, and return 0 if it's appropriate to let the PM
* core queue a suspend request for the device.
*
* Refer to Documentation/power/runtime_pm.txt for more information about the
* role of the above callbacks in device runtime power management.
@ -352,7 +352,7 @@ const struct dev_pm_ops name = { \
/*
* Use this for defining a set of PM operations to be used in all situations
* (sustem suspend, hibernation or runtime PM).
* (system suspend, hibernation or runtime PM).
* NOTE: In general, system suspend callbacks, .suspend() and .resume(), should
* be different from the corresponding runtime PM callbacks, .runtime_suspend(),
* and .runtime_resume(), because .runtime_suspend() always works on an already
@ -379,7 +379,7 @@ const struct dev_pm_ops name = { \
*
* ON No transition.
*
* FREEZE System is going to hibernate, call ->prepare() and ->freeze()
* FREEZE System is going to hibernate, call ->prepare() and ->freeze()
* for all devices.
*
* SUSPEND System is going to suspend, call ->prepare() and ->suspend()
@ -423,7 +423,7 @@ const struct dev_pm_ops name = { \
#define PM_EVENT_INVALID (-1)
#define PM_EVENT_ON 0x0000
#define PM_EVENT_FREEZE 0x0001
#define PM_EVENT_FREEZE 0x0001
#define PM_EVENT_SUSPEND 0x0002
#define PM_EVENT_HIBERNATE 0x0004
#define PM_EVENT_QUIESCE 0x0008
@ -542,6 +542,8 @@ struct dev_pm_info {
unsigned int async_suspend:1;
bool is_prepared:1; /* Owned by the PM core */
bool is_suspended:1; /* Ditto */
bool is_noirq_suspended:1;
bool is_late_suspended:1;
bool ignore_children:1;
bool early_init:1; /* Owned by the PM core */
spinlock_t lock;
@ -613,11 +615,11 @@ struct dev_pm_domain {
* message is implicit:
*
* ON Driver starts working again, responding to hardware events
* and software requests. The hardware may have gone through
* a power-off reset, or it may have maintained state from the
* previous suspend() which the driver will rely on while
* resuming. On most platforms, there are no restrictions on
* availability of resources like clocks during resume().
* and software requests. The hardware may have gone through
* a power-off reset, or it may have maintained state from the
* previous suspend() which the driver will rely on while
* resuming. On most platforms, there are no restrictions on
* availability of resources like clocks during resume().
*
* Other transitions are triggered by messages sent using suspend(). All
* these transitions quiesce the driver, so that I/O queues are inactive.
@ -627,21 +629,21 @@ struct dev_pm_domain {
* differ according to the message:
*
* SUSPEND Quiesce, enter a low power device state appropriate for
* the upcoming system state (such as PCI_D3hot), and enable
* wakeup events as appropriate.
* the upcoming system state (such as PCI_D3hot), and enable
* wakeup events as appropriate.
*
* HIBERNATE Enter a low power device state appropriate for the hibernation
* state (eg. ACPI S4) and enable wakeup events as appropriate.
* state (eg. ACPI S4) and enable wakeup events as appropriate.
*
* FREEZE Quiesce operations so that a consistent image can be saved;
* but do NOT otherwise enter a low power device state, and do
* NOT emit system wakeup events.
* but do NOT otherwise enter a low power device state, and do
* NOT emit system wakeup events.
*
* PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring
* the system from a snapshot taken after an earlier FREEZE.
* Some drivers will need to reset their hardware state instead
* of preserving it, to ensure that it's never mistaken for the
* state which that earlier snapshot had set up.
* the system from a snapshot taken after an earlier FREEZE.
* Some drivers will need to reset their hardware state instead
* of preserving it, to ensure that it's never mistaken for the
* state which that earlier snapshot had set up.
*
* A minimally power-aware driver treats all messages as SUSPEND, fully
* reinitializes its device during resume() -- whether or not it was reset
@ -718,14 +720,26 @@ static inline void dpm_for_each_dev(void *data, void (*fn)(struct device *, void
{
}
#define pm_generic_prepare NULL
#define pm_generic_suspend NULL
#define pm_generic_resume NULL
#define pm_generic_freeze NULL
#define pm_generic_thaw NULL
#define pm_generic_restore NULL
#define pm_generic_poweroff NULL
#define pm_generic_complete NULL
#define pm_generic_prepare NULL
#define pm_generic_suspend_late NULL
#define pm_generic_suspend_noirq NULL
#define pm_generic_suspend NULL
#define pm_generic_resume_early NULL
#define pm_generic_resume_noirq NULL
#define pm_generic_resume NULL
#define pm_generic_freeze_noirq NULL
#define pm_generic_freeze_late NULL
#define pm_generic_freeze NULL
#define pm_generic_thaw_noirq NULL
#define pm_generic_thaw_early NULL
#define pm_generic_thaw NULL
#define pm_generic_restore_noirq NULL
#define pm_generic_restore_early NULL
#define pm_generic_restore NULL
#define pm_generic_poweroff_noirq NULL
#define pm_generic_poweroff_late NULL
#define pm_generic_poweroff NULL
#define pm_generic_complete NULL
#endif /* !CONFIG_PM_SLEEP */
/* How to reorder dpm_list after device_move() */

22
kernel/power/hibernate.c
View file

@ -973,16 +973,20 @@ static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t n)
{
unsigned int maj, min;
dev_t res;
int ret = -EINVAL;
int len = n;
char *name;
if (sscanf(buf, "%u:%u", &maj, &min) != 2)
goto out;
if (len && buf[len-1] == '\n')
len--;
name = kstrndup(buf, len, GFP_KERNEL);
if (!name)
return -ENOMEM;
res = MKDEV(maj,min);
if (maj != MAJOR(res) || min != MINOR(res))
goto out;
res = name_to_dev_t(name);
kfree(name);
if (!res)
return -EINVAL;
lock_system_sleep();
swsusp_resume_device = res;
@ -990,9 +994,7 @@ static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
printk(KERN_INFO "PM: Starting manual resume from disk\n");
noresume = 0;
software_resume();
ret = n;
out:
return ret;
return n;
}
power_attr(resume);

4
kernel/power/main.c
View file

@ -282,8 +282,8 @@ struct kobject *power_kobj;
* state - control system power state.
*
* show() returns what states are supported, which is hard-coded to
* 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and
* 'disk' (Suspend-to-Disk).
* 'freeze' (Low-Power Idle), 'standby' (Power-On Suspend),
* 'mem' (Suspend-to-RAM), and 'disk' (Suspend-to-Disk).
*
* store() accepts one of those strings, translates it into the
* proper enumerated value, and initiates a suspend transition.

2
kernel/power/power.h
View file

@ -49,6 +49,8 @@ static inline char *check_image_kernel(struct swsusp_info *info)
*/
#define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
asmlinkage int swsusp_save(void);
/* kernel/power/hibernate.c */
extern bool freezer_test_done;

2
kernel/power/snapshot.c
View file

@ -1268,7 +1268,7 @@ static void free_unnecessary_pages(void)
* [number of saveable pages] - [number of pages that can be freed in theory]
*
* where the second term is the sum of (1) reclaimable slab pages, (2) active
* and (3) inactive anonymouns pages, (4) active and (5) inactive file pages,
* and (3) inactive anonymous pages, (4) active and (5) inactive file pages,
* minus mapped file pages.
*/
static unsigned long minimum_image_size(unsigned long saveable)

2
kernel/power/suspend.c
View file

@ -39,7 +39,7 @@ static const struct platform_suspend_ops *suspend_ops;
static bool need_suspend_ops(suspend_state_t state)
{
return !!(state > PM_SUSPEND_FREEZE);
return state > PM_SUSPEND_FREEZE;
}
static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head);

2
kernel/power/wakelock.c
View file

@ -18,6 +18,8 @@
#include <linux/rbtree.h>
#include <linux/slab.h>
#include "power.h"
static DEFINE_MUTEX(wakelocks_lock);
struct wakelock {