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Power management updates for 3.4

Browse source 
Assorted extensions and fixes including:
 
 * Introduction of early/late suspend/hibernation device callbacks.
 * Generic PM domains extensions and fixes.
 * devfreq updates from Axel Lin and MyungJoo Ham.
 * Device PM QoS updates.
 * Fixes of concurrency problems with wakeup sources.
 * System suspend and hibernation fixes.
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Merge tag 'pm-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management updates for 3.4 from Rafael Wysocki:
 "Assorted extensions and fixes including:

  * Introduction of early/late suspend/hibernation device callbacks.
  * Generic PM domains extensions and fixes.
  * devfreq updates from Axel Lin and MyungJoo Ham.
  * Device PM QoS updates.
  * Fixes of concurrency problems with wakeup sources.
  * System suspend and hibernation fixes."

* tag 'pm-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (43 commits)
  PM / Domains: Check domain status during hibernation restore of devices
  PM / devfreq: add relation of recommended frequency.
  PM / shmobile: Make MTU2 driver use pm_genpd_dev_always_on()
  PM / shmobile: Make CMT driver use pm_genpd_dev_always_on()
  PM / shmobile: Make TMU driver use pm_genpd_dev_always_on()
  PM / Domains: Introduce "always on" device flag
  PM / Domains: Fix hibernation restore of devices, v2
  PM / Domains: Fix handling of wakeup devices during system resume
  sh_mmcif / PM: Use PM QoS latency constraint
  tmio_mmc / PM: Use PM QoS latency constraint
  PM / QoS: Make it possible to expose PM QoS latency constraints
  PM / Sleep: JBD and JBD2 missing set_freezable()
  PM / Domains: Fix include for PM_GENERIC_DOMAINS=n case
  PM / Freezer: Remove references to TIF_FREEZE in comments
  PM / Sleep: Add more wakeup source initialization routines
  PM / Hibernate: Enable usermodehelpers in hibernate() error path
  PM / Sleep: Make __pm_stay_awake() delete wakeup source timers
  PM / Sleep: Fix race conditions related to wakeup source timer function
  PM / Sleep: Fix possible infinite loop during wakeup source destruction
  PM / Hibernate: print physical addresses consistently with other parts of kernel
  ...
This commit is contained in:
Linus Torvalds 2012-03-21 10:15:51 -07:00
commit c7c66c0cb0
53 changed files with 1452 additions and 611 deletions
Download patch file Download diff file Expand all files Collapse all files

263
drivers/base/power/domain.c
View file

@ -366,7 +366,7 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
not_suspended = 0;
list_for_each_entry(pdd, &genpd->dev_list, list_node)
if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
|| pdd->dev->power.irq_safe))
|| pdd->dev->power.irq_safe || to_gpd_data(pdd)->always_on))
not_suspended++;
if (not_suspended > genpd->in_progress)
@ -503,6 +503,9 @@ static int pm_genpd_runtime_suspend(struct device *dev)
might_sleep_if(!genpd->dev_irq_safe);
if (dev_gpd_data(dev)->always_on)
return -EBUSY;
stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL;
if (stop_ok && !stop_ok(dev))
return -EBUSY;
@ -764,8 +767,10 @@ static int pm_genpd_prepare(struct device *dev)
genpd_acquire_lock(genpd);
if (genpd->prepared_count++ == 0)
if (genpd->prepared_count++ == 0) {
genpd->suspended_count = 0;
genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
}
genpd_release_lock(genpd);
@ -820,17 +825,16 @@ static int pm_genpd_suspend(struct device *dev)
}
/**
* pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain.
* pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain.
* @dev: Device to suspend.
*
* Carry out a late suspend of a device under the assumption that its
* pm_domain field points to the domain member of an object of type
* struct generic_pm_domain representing a PM domain consisting of I/O devices.
*/
static int pm_genpd_suspend_noirq(struct device *dev)
static int pm_genpd_suspend_late(struct device *dev)
{
struct generic_pm_domain *genpd;
int ret;
dev_dbg(dev, "%s()\n", __func__);
@ -838,14 +842,28 @@ static int pm_genpd_suspend_noirq(struct device *dev)
if (IS_ERR(genpd))
return -EINVAL;
if (genpd->suspend_power_off)
return 0;
return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev);
}
ret = genpd_suspend_late(genpd, dev);
if (ret)
return ret;
/**
* pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
* @dev: Device to suspend.
*
* Stop the device and remove power from the domain if all devices in it have
* been stopped.
*/
static int pm_genpd_suspend_noirq(struct device *dev)
{
struct generic_pm_domain *genpd;
if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))
dev_dbg(dev, "%s()\n", __func__);
genpd = dev_to_genpd(dev);
if (IS_ERR(genpd))
return -EINVAL;
if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on
|| (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
return 0;
genpd_stop_dev(genpd, dev);
@ -862,13 +880,10 @@ static int pm_genpd_suspend_noirq(struct device *dev)
}
/**
* pm_genpd_resume_noirq - Early resume of a device from an I/O power domain.
* pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain.
* @dev: Device to resume.
*
* Carry out an early resume of a device under the assumption that its
* pm_domain field points to the domain member of an object of type
* struct generic_pm_domain representing a power domain consisting of I/O
* devices.
* Restore power to the device's PM domain, if necessary, and start the device.
*/
static int pm_genpd_resume_noirq(struct device *dev)
{
@ -880,7 +895,8 @@ static int pm_genpd_resume_noirq(struct device *dev)
if (IS_ERR(genpd))
return -EINVAL;
if (genpd->suspend_power_off)
if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on
|| (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
return 0;
/*
@ -890,13 +906,34 @@ static int pm_genpd_resume_noirq(struct device *dev)
*/
pm_genpd_poweron(genpd);
genpd->suspended_count--;
genpd_start_dev(genpd, dev);
return genpd_resume_early(genpd, dev);
return genpd_start_dev(genpd, dev);
}
/**
* pm_genpd_resume - Resume a device belonging to an I/O power domain.
* pm_genpd_resume_early - Early resume of a device in an I/O PM domain.
* @dev: Device to resume.
*
* Carry out an early resume of a device under the assumption that its
* pm_domain field points to the domain member of an object of type
* struct generic_pm_domain representing a power domain consisting of I/O
* devices.
*/
static int pm_genpd_resume_early(struct device *dev)
{
struct generic_pm_domain *genpd;
dev_dbg(dev, "%s()\n", __func__);
genpd = dev_to_genpd(dev);
if (IS_ERR(genpd))
return -EINVAL;
return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev);
}
/**
* pm_genpd_resume - Resume of device in an I/O PM domain.
* @dev: Device to resume.
*
* Resume a device under the assumption that its pm_domain field points to the
@ -917,7 +954,7 @@ static int pm_genpd_resume(struct device *dev)
}
/**
* pm_genpd_freeze - Freeze a device belonging to an I/O power domain.
* pm_genpd_freeze - Freezing a device in an I/O PM domain.
* @dev: Device to freeze.
*
* Freeze a device under the assumption that its pm_domain field points to the
@ -938,7 +975,29 @@ static int pm_genpd_freeze(struct device *dev)
}
/**
* pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain.
* pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain.
* @dev: Device to freeze.
*
* Carry out a late freeze of a device under the assumption that its
* pm_domain field points to the domain member of an object of type
* struct generic_pm_domain representing a power domain consisting of I/O
* devices.
*/
static int pm_genpd_freeze_late(struct device *dev)
{
struct generic_pm_domain *genpd;
dev_dbg(dev, "%s()\n", __func__);
genpd = dev_to_genpd(dev);
if (IS_ERR(genpd))
return -EINVAL;
return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev);
}
/**
* pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
* @dev: Device to freeze.
*
* Carry out a late freeze of a device under the assumption that its
@ -949,7 +1008,6 @@ static int pm_genpd_freeze(struct device *dev)
static int pm_genpd_freeze_noirq(struct device *dev)
{
struct generic_pm_domain *genpd;
int ret;
dev_dbg(dev, "%s()\n", __func__);
@ -957,26 +1015,16 @@ static int pm_genpd_freeze_noirq(struct device *dev)
if (IS_ERR(genpd))
return -EINVAL;
if (genpd->suspend_power_off)
return 0;
ret = genpd_freeze_late(genpd, dev);
if (ret)
return ret;
genpd_stop_dev(genpd, dev);
return 0;
return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ?
0 : genpd_stop_dev(genpd, dev);
}
/**
* pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain.
* pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
* @dev: Device to thaw.
*
* Carry out an early thaw of a device under the assumption that its
* pm_domain field points to the domain member of an object of type
* struct generic_pm_domain representing a power domain consisting of I/O
* devices.
* Start the device, unless power has been removed from the domain already
* before the system transition.
*/
static int pm_genpd_thaw_noirq(struct device *dev)
{
@ -988,12 +1036,30 @@ static int pm_genpd_thaw_noirq(struct device *dev)
if (IS_ERR(genpd))
return -EINVAL;
if (genpd->suspend_power_off)
return 0;
return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ?
0 : genpd_start_dev(genpd, dev);
}
genpd_start_dev(genpd, dev);
/**
* pm_genpd_thaw_early - Early thaw of device in an I/O PM domain.
* @dev: Device to thaw.
*
* Carry out an early thaw of a device under the assumption that its
* pm_domain field points to the domain member of an object of type
* struct generic_pm_domain representing a power domain consisting of I/O
* devices.
*/
static int pm_genpd_thaw_early(struct device *dev)
{
struct generic_pm_domain *genpd;
return genpd_thaw_early(genpd, dev);
dev_dbg(dev, "%s()\n", __func__);
genpd = dev_to_genpd(dev);
if (IS_ERR(genpd))
return -EINVAL;
return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev);
}
/**
@ -1018,13 +1084,11 @@ static int pm_genpd_thaw(struct device *dev)
}
/**
* pm_genpd_restore_noirq - Early restore of a device from an I/O power domain.
* pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain.
* @dev: Device to resume.
*
* Carry out an early restore of a device under the assumption that its
* pm_domain field points to the domain member of an object of type
* struct generic_pm_domain representing a power domain consisting of I/O
* devices.
* Make sure the domain will be in the same power state as before the
* hibernation the system is resuming from and start the device if necessary.
*/
static int pm_genpd_restore_noirq(struct device *dev)
{
@ -1040,23 +1104,35 @@ static int pm_genpd_restore_noirq(struct device *dev)
* Since all of the "noirq" callbacks are executed sequentially, it is
* guaranteed that this function will never run twice in parallel for
* the same PM domain, so it is not necessary to use locking here.
*
* At this point suspended_count == 0 means we are being run for the
* first time for the given domain in the present cycle.
*/
genpd->status = GPD_STATE_POWER_OFF;
if (genpd->suspend_power_off) {
if (genpd->suspended_count++ == 0) {
/*
* The boot kernel might put the domain into the power on state,
* so make sure it really is powered off.
* The boot kernel might put the domain into arbitrary state,
* so make it appear as powered off to pm_genpd_poweron(), so
* that it tries to power it on in case it was really off.
*/
if (genpd->power_off)
genpd->power_off(genpd);
return 0;
genpd->status = GPD_STATE_POWER_OFF;
if (genpd->suspend_power_off) {
/*
* If the domain was off before the hibernation, make
* sure it will be off going forward.
*/
if (genpd->power_off)
genpd->power_off(genpd);
return 0;
}
}
pm_genpd_poweron(genpd);
genpd->suspended_count--;
genpd_start_dev(genpd, dev);
if (genpd->suspend_power_off)
return 0;
return genpd_resume_early(genpd, dev);
pm_genpd_poweron(genpd);
return dev_gpd_data(dev)->always_on ? 0 : genpd_start_dev(genpd, dev);
}
/**
@ -1099,11 +1175,15 @@ static void pm_genpd_complete(struct device *dev)
#define pm_genpd_prepare NULL
#define pm_genpd_suspend NULL
#define pm_genpd_suspend_late NULL
#define pm_genpd_suspend_noirq NULL
#define pm_genpd_resume_early NULL
#define pm_genpd_resume_noirq NULL
#define pm_genpd_resume NULL
#define pm_genpd_freeze NULL
#define pm_genpd_freeze_late NULL
#define pm_genpd_freeze_noirq NULL
#define pm_genpd_thaw_early NULL
#define pm_genpd_thaw_noirq NULL
#define pm_genpd_thaw NULL
#define pm_genpd_restore_noirq NULL
@ -1170,6 +1250,38 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
return ret;
}
/**
* __pm_genpd_of_add_device - Add a device to an I/O PM domain.
* @genpd_node: Device tree node pointer representing a PM domain to which the
* the device is added to.
* @dev: Device to be added.
* @td: Set of PM QoS timing parameters to attach to the device.
*/
int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev,
struct gpd_timing_data *td)
{
struct generic_pm_domain *genpd = NULL, *gpd;
dev_dbg(dev, "%s()\n", __func__);
if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev))
return -EINVAL;
mutex_lock(&gpd_list_lock);
list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
if (gpd->of_node == genpd_node) {
genpd = gpd;
break;
}
}
mutex_unlock(&gpd_list_lock);
if (!genpd)
return -EINVAL;
return __pm_genpd_add_device(genpd, dev, td);
}
/**
* pm_genpd_remove_device - Remove a device from an I/O PM domain.
* @genpd: PM domain to remove the device from.
@ -1215,6 +1327,26 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
return ret;
}
/**
* pm_genpd_dev_always_on - Set/unset the "always on" flag for a given device.
* @dev: Device to set/unset the flag for.
* @val: The new value of the device's "always on" flag.
*/
void pm_genpd_dev_always_on(struct device *dev, bool val)
{
struct pm_subsys_data *psd;
unsigned long flags;
spin_lock_irqsave(&dev->power.lock, flags);
psd = dev_to_psd(dev);
if (psd && psd->domain_data)
to_gpd_data(psd->domain_data)->always_on = val;
spin_unlock_irqrestore(&dev->power.lock, flags);
}
EXPORT_SYMBOL_GPL(pm_genpd_dev_always_on);
/**
* pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
* @genpd: Master PM domain to add the subdomain to.
@ -1450,7 +1582,7 @@ static int pm_genpd_default_suspend_late(struct device *dev)
{
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late;
return cb ? cb(dev) : pm_generic_suspend_noirq(dev);
return cb ? cb(dev) : pm_generic_suspend_late(dev);
}
/**
@ -1461,7 +1593,7 @@ static int pm_genpd_default_resume_early(struct device *dev)
{
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early;
return cb ? cb(dev) : pm_generic_resume_noirq(dev);
return cb ? cb(dev) : pm_generic_resume_early(dev);
}
/**
@ -1494,7 +1626,7 @@ static int pm_genpd_default_freeze_late(struct device *dev)
{
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late;
return cb ? cb(dev) : pm_generic_freeze_noirq(dev);
return cb ? cb(dev) : pm_generic_freeze_late(dev);
}
/**
@ -1505,7 +1637,7 @@ static int pm_genpd_default_thaw_early(struct device *dev)
{
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early;
return cb ? cb(dev) : pm_generic_thaw_noirq(dev);
return cb ? cb(dev) : pm_generic_thaw_early(dev);
}
/**
@ -1557,23 +1689,28 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
genpd->poweroff_task = NULL;
genpd->resume_count = 0;
genpd->device_count = 0;
genpd->suspended_count = 0;
genpd->max_off_time_ns = -1;
genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
genpd->domain.ops.runtime_idle = pm_generic_runtime_idle;
genpd->domain.ops.prepare = pm_genpd_prepare;
genpd->domain.ops.suspend = pm_genpd_suspend;
genpd->domain.ops.suspend_late = pm_genpd_suspend_late;
genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
genpd->domain.ops.resume_early = pm_genpd_resume_early;
genpd->domain.ops.resume = pm_genpd_resume;
genpd->domain.ops.freeze = pm_genpd_freeze;
genpd->domain.ops.freeze_late = pm_genpd_freeze_late;
genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
genpd->domain.ops.thaw_early = pm_genpd_thaw_early;
genpd->domain.ops.thaw = pm_genpd_thaw;
genpd->domain.ops.poweroff = pm_genpd_suspend;
genpd->domain.ops.poweroff_late = pm_genpd_suspend_late;
genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq;
genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
genpd->domain.ops.restore_early = pm_genpd_resume_early;
genpd->domain.ops.restore = pm_genpd_resume;
genpd->domain.ops.complete = pm_genpd_complete;
genpd->dev_ops.save_state = pm_genpd_default_save_state;

165
drivers/base/power/generic_ops.c
View file

@ -91,68 +91,39 @@ int pm_generic_prepare(struct device *dev)
return ret;
}
/**
* __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback.
* @dev: Device to handle.
* @event: PM transition of the system under way.
* @bool: Whether or not this is the "noirq" stage.
*
* Execute the PM callback corresponding to @event provided by the driver of
* @dev, if defined, and return its error code. Return 0 if the callback is
* not present.
*/
static int __pm_generic_call(struct device *dev, int event, bool noirq)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int (*callback)(struct device *);
if (!pm)
return 0;
switch (event) {
case PM_EVENT_SUSPEND:
callback = noirq ? pm->suspend_noirq : pm->suspend;
break;
case PM_EVENT_FREEZE:
callback = noirq ? pm->freeze_noirq : pm->freeze;
break;
case PM_EVENT_HIBERNATE:
callback = noirq ? pm->poweroff_noirq : pm->poweroff;
break;
case PM_EVENT_RESUME:
callback = noirq ? pm->resume_noirq : pm->resume;
break;
case PM_EVENT_THAW:
callback = noirq ? pm->thaw_noirq : pm->thaw;
break;
case PM_EVENT_RESTORE:
callback = noirq ? pm->restore_noirq : pm->restore;
break;
default:
callback = NULL;
break;
}
return callback ? callback(dev) : 0;
}
/**
* pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems.
* @dev: Device to suspend.
*/
int pm_generic_suspend_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_SUSPEND, true);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->suspend_noirq ? pm->suspend_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq);
/**
* pm_generic_suspend_late - Generic suspend_late callback for subsystems.
* @dev: Device to suspend.
*/
int pm_generic_suspend_late(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->suspend_late ? pm->suspend_late(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_suspend_late);
/**
* pm_generic_suspend - Generic suspend callback for subsystems.
* @dev: Device to suspend.
*/
int pm_generic_suspend(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_SUSPEND, false);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->suspend ? pm->suspend(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_suspend);
@ -162,17 +133,33 @@ EXPORT_SYMBOL_GPL(pm_generic_suspend);
*/
int pm_generic_freeze_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_FREEZE, true);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->freeze_noirq ? pm->freeze_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_freeze_noirq);
/**
* pm_generic_freeze_late - Generic freeze_late callback for subsystems.
* @dev: Device to freeze.
*/
int pm_generic_freeze_late(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->freeze_late ? pm->freeze_late(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_freeze_late);
/**
* pm_generic_freeze - Generic freeze callback for subsystems.
* @dev: Device to freeze.
*/
int pm_generic_freeze(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_FREEZE, false);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->freeze ? pm->freeze(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_freeze);
@ -182,17 +169,33 @@ EXPORT_SYMBOL_GPL(pm_generic_freeze);
*/
int pm_generic_poweroff_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_HIBERNATE, true);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->poweroff_noirq ? pm->poweroff_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_poweroff_noirq);
/**
* pm_generic_poweroff_late - Generic poweroff_late callback for subsystems.
* @dev: Device to handle.
*/
int pm_generic_poweroff_late(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->poweroff_late ? pm->poweroff_late(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_poweroff_late);
/**
* pm_generic_poweroff - Generic poweroff callback for subsystems.
* @dev: Device to handle.
*/
int pm_generic_poweroff(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_HIBERNATE, false);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->poweroff ? pm->poweroff(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_poweroff);
@ -202,17 +205,33 @@ EXPORT_SYMBOL_GPL(pm_generic_poweroff);
*/
int pm_generic_thaw_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_THAW, true);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->thaw_noirq ? pm->thaw_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_thaw_noirq);
/**
* pm_generic_thaw_early - Generic thaw_early callback for subsystems.
* @dev: Device to thaw.
*/
int pm_generic_thaw_early(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->thaw_early ? pm->thaw_early(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_thaw_early);
/**
* pm_generic_thaw - Generic thaw callback for subsystems.
* @dev: Device to thaw.
*/
int pm_generic_thaw(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_THAW, false);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->thaw ? pm->thaw(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_thaw);
@ -222,17 +241,33 @@ EXPORT_SYMBOL_GPL(pm_generic_thaw);
*/
int pm_generic_resume_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_RESUME, true);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->resume_noirq ? pm->resume_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_resume_noirq);
/**
* pm_generic_resume_early - Generic resume_early callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_resume_early(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->resume_early ? pm->resume_early(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_resume_early);
/**
* pm_generic_resume - Generic resume callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_resume(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_RESUME, false);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->resume ? pm->resume(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_resume);
@ -242,17 +277,33 @@ EXPORT_SYMBOL_GPL(pm_generic_resume);
*/
int pm_generic_restore_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_RESTORE, true);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->restore_noirq ? pm->restore_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_restore_noirq);
/**
* pm_generic_restore_early - Generic restore_early callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_restore_early(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->restore_early ? pm->restore_early(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_restore_early);
/**
* pm_generic_restore - Generic restore callback for subsystems.
* @dev: Device to restore.
*/
int pm_generic_restore(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_RESTORE, false);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->restore ? pm->restore(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_restore);

249
drivers/base/power/main.c
View file

@ -47,6 +47,7 @@ typedef int (*pm_callback_t)(struct device *);
LIST_HEAD(dpm_list);
LIST_HEAD(dpm_prepared_list);
LIST_HEAD(dpm_suspended_list);
LIST_HEAD(dpm_late_early_list);
LIST_HEAD(dpm_noirq_list);
struct suspend_stats suspend_stats;
@ -245,6 +246,40 @@ static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state)
return NULL;
}
/**
* pm_late_early_op - Return the PM operation appropriate for given PM event.
* @ops: PM operations to choose from.
* @state: PM transition of the system being carried out.
*
* Runtime PM is disabled for @dev while this function is being executed.
*/
static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops,
pm_message_t state)
{
switch (state.event) {
#ifdef CONFIG_SUSPEND
case PM_EVENT_SUSPEND:
return ops->suspend_late;
case PM_EVENT_RESUME:
return ops->resume_early;
#endif /* CONFIG_SUSPEND */
#ifdef CONFIG_HIBERNATE_CALLBACKS
case PM_EVENT_FREEZE:
case PM_EVENT_QUIESCE:
return ops->freeze_late;
case PM_EVENT_HIBERNATE:
return ops->poweroff_late;
case PM_EVENT_THAW:
case PM_EVENT_RECOVER:
return ops->thaw_early;
case PM_EVENT_RESTORE:
return ops->restore_early;
#endif /* CONFIG_HIBERNATE_CALLBACKS */
}
return NULL;
}
/**
* pm_noirq_op - Return the PM operation appropriate for given PM event.
* @ops: PM operations to choose from.
@ -374,21 +409,21 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
TRACE_RESUME(0);
if (dev->pm_domain) {
info = "EARLY power domain ";
info = "noirq power domain ";
callback = pm_noirq_op(&dev->pm_domain->ops, state);
} else if (dev->type && dev->type->pm) {
info = "EARLY type ";
info = "noirq type ";
callback = pm_noirq_op(dev->type->pm, state);
} else if (dev->class && dev->class->pm) {
info = "EARLY class ";
info = "noirq class ";
callback = pm_noirq_op(dev->class->pm, state);
} else if (dev->bus && dev->bus->pm) {
info = "EARLY bus ";
info = "noirq bus ";
callback = pm_noirq_op(dev->bus->pm, state);
}
if (!callback && dev->driver && dev->driver->pm) {
info = "EARLY driver ";
info = "noirq driver ";
callback = pm_noirq_op(dev->driver->pm, state);
}
@ -399,13 +434,13 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
}
/**
* dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices.
* dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
* @state: PM transition of the system being carried out.
*
* Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and
* Call the "noirq" resume handlers for all devices in dpm_noirq_list and
* enable device drivers to receive interrupts.
*/
void dpm_resume_noirq(pm_message_t state)
static void dpm_resume_noirq(pm_message_t state)
{
ktime_t starttime = ktime_get();
@ -415,7 +450,7 @@ void dpm_resume_noirq(pm_message_t state)
int error;
get_device(dev);
list_move_tail(&dev->power.entry, &dpm_suspended_list);
list_move_tail(&dev->power.entry, &dpm_late_early_list);
mutex_unlock(&dpm_list_mtx);
error = device_resume_noirq(dev, state);
@ -423,6 +458,80 @@ void dpm_resume_noirq(pm_message_t state)
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);
dpm_show_time(starttime, state, "noirq");
resume_device_irqs();
}
/**
* device_resume_early - Execute an "early resume" callback for given device.
* @dev: Device to handle.
* @state: PM transition of the system being carried out.
*
* Runtime PM is disabled for @dev while this function is being executed.
*/
static int device_resume_early(struct device *dev, pm_message_t state)
{
pm_callback_t callback = NULL;
char *info = NULL;
int error = 0;
TRACE_DEVICE(dev);
TRACE_RESUME(0);
if (dev->pm_domain) {
info = "early power domain ";
callback = pm_late_early_op(&dev->pm_domain->ops, state);
} else if (dev->type && dev->type->pm) {
info = "early type ";
callback = pm_late_early_op(dev->type->pm, state);
} else if (dev->class && dev->class->pm) {
info = "early class ";
callback = pm_late_early_op(dev->class->pm, state);
} else if (dev->bus && dev->bus->pm) {
info = "early bus ";
callback = pm_late_early_op(dev->bus->pm, state);
}
if (!callback && dev->driver && dev->driver->pm) {
info = "early driver ";
callback = pm_late_early_op(dev->driver->pm, state);
}
error = dpm_run_callback(callback, dev, state, info);
TRACE_RESUME(error);
return error;
}
/**
* 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)
{
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;
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);
}
@ -431,9 +540,18 @@ void dpm_resume_noirq(pm_message_t state)
}
mutex_unlock(&dpm_list_mtx);
dpm_show_time(starttime, state, "early");
resume_device_irqs();
}
EXPORT_SYMBOL_GPL(dpm_resume_noirq);
/**
* dpm_resume_start - Execute "noirq" and "early" device callbacks.
* @state: PM transition of the system being carried out.
*/
void dpm_resume_start(pm_message_t state)
{
dpm_resume_noirq(state);
dpm_resume_early(state);
}
EXPORT_SYMBOL_GPL(dpm_resume_start);
/**
* device_resume - Execute "resume" callbacks for given device.
@ -716,21 +834,21 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
char *info = NULL;
if (dev->pm_domain) {
info = "LATE power domain ";
info = "noirq power domain ";
callback = pm_noirq_op(&dev->pm_domain->ops, state);
} else if (dev->type && dev->type->pm) {
info = "LATE type ";
info = "noirq type ";
callback = pm_noirq_op(dev->type->pm, state);
} else if (dev->class && dev->class->pm) {
info = "LATE class ";
info = "noirq class ";
callback = pm_noirq_op(dev->class->pm, state);
} else if (dev->bus && dev->bus->pm) {
info = "LATE bus ";
info = "noirq bus ";
callback = pm_noirq_op(dev->bus->pm, state);
}
if (!callback && dev->driver && dev->driver->pm) {
info = "LATE driver ";
info = "noirq driver ";
callback = pm_noirq_op(dev->driver->pm, state);
}
@ -738,21 +856,21 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
}
/**
* dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices.
* dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices.
* @state: PM transition of the system being carried out.
*
* Prevent device drivers from receiving interrupts and call the "noirq" suspend
* handlers for all non-sysdev devices.
*/
int dpm_suspend_noirq(pm_message_t state)
static int dpm_suspend_noirq(pm_message_t state)
{
ktime_t starttime = ktime_get();
int error = 0;
suspend_device_irqs();
mutex_lock(&dpm_list_mtx);
while (!list_empty(&dpm_suspended_list)) {
struct device *dev = to_device(dpm_suspended_list.prev);
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);
@ -761,7 +879,7 @@ int dpm_suspend_noirq(pm_message_t state)
mutex_lock(&dpm_list_mtx);
if (error) {
pm_dev_err(dev, state, " late", 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));
@ -776,10 +894,95 @@ int dpm_suspend_noirq(pm_message_t state)
if (error)
dpm_resume_noirq(resume_event(state));
else
dpm_show_time(starttime, state, "late");
dpm_show_time(starttime, state, "noirq");
return error;
}
EXPORT_SYMBOL_GPL(dpm_suspend_noirq);
/**
* device_suspend_late - Execute a "late suspend" callback for given device.
* @dev: Device to handle.
* @state: PM transition of the system being carried out.
*
* Runtime PM is disabled for @dev while this function is being executed.
*/
static int device_suspend_late(struct device *dev, pm_message_t state)
{
pm_callback_t callback = NULL;
char *info = NULL;
if (dev->pm_domain) {
info = "late power domain ";
callback = pm_late_early_op(&dev->pm_domain->ops, state);
} else if (dev->type && dev->type->pm) {
info = "late type ";
callback = pm_late_early_op(dev->type->pm, state);
} else if (dev->class && dev->class->pm) {
info = "late class ";
callback = pm_late_early_op(dev->class->pm, state);
} else if (dev->bus && dev->bus->pm) {
info = "late bus ";
callback = pm_late_early_op(dev->bus->pm, state);
}
if (!callback && dev->driver && dev->driver->pm) {
info = "late driver ";
callback = pm_late_early_op(dev->driver->pm, state);
}
return dpm_run_callback(callback, dev, state, info);
}
/**
* dpm_suspend_late - Execute "late suspend" callbacks for all devices.
* @state: PM transition of the system being carried out.
*/
static int dpm_suspend_late(pm_message_t state)
{
ktime_t starttime = ktime_get();
int error = 0;
mutex_lock(&dpm_list_mtx);
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);
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;
}
if (!list_empty(&dev->power.entry))
list_move(&dev->power.entry, &dpm_late_early_list);
put_device(dev);
}
mutex_unlock(&dpm_list_mtx);
if (error)
dpm_resume_early(resume_event(state));
else
dpm_show_time(starttime, state, "late");
return error;
}
/**
* dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks.
* @state: PM transition of the system being carried out.
*/
int dpm_suspend_end(pm_message_t state)
{
int error = dpm_suspend_late(state);
return error ? : dpm_suspend_noirq(state);
}
EXPORT_SYMBOL_GPL(dpm_suspend_end);
/**
* legacy_suspend - Execute a legacy (bus or class) suspend callback for device.

4
drivers/base/power/power.h
View file

@ -71,6 +71,8 @@ extern void dpm_sysfs_remove(struct device *dev);
extern void rpm_sysfs_remove(struct device *dev);
extern int wakeup_sysfs_add(struct device *dev);
extern void wakeup_sysfs_remove(struct device *dev);
extern int pm_qos_sysfs_add(struct device *dev);
extern void pm_qos_sysfs_remove(struct device *dev);
#else /* CONFIG_PM */
@ -79,5 +81,7 @@ static inline void dpm_sysfs_remove(struct device *dev) {}
static inline void rpm_sysfs_remove(struct device *dev) {}
static inline int wakeup_sysfs_add(struct device *dev) { return 0; }
static inline void wakeup_sysfs_remove(struct device *dev) {}
static inline int pm_qos_sysfs_add(struct device *dev) { return 0; }
static inline void pm_qos_sysfs_remove(struct device *dev) {}
#endif

61
drivers/base/power/qos.c
View file

@ -41,6 +41,7 @@
#include <linux/mutex.h>
#include <linux/export.h>
#include "power.h"
static DEFINE_MUTEX(dev_pm_qos_mtx);
@ -166,6 +167,12 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
struct dev_pm_qos_request *req, *tmp;
struct pm_qos_constraints *c;
/*
* If the device's PM QoS resume latency limit has been exposed to user
* space, it has to be hidden at this point.
*/
dev_pm_qos_hide_latency_limit(dev);
mutex_lock(&dev_pm_qos_mtx);
dev->power.power_state = PMSG_INVALID;
@ -445,3 +452,57 @@ int dev_pm_qos_add_ancestor_request(struct device *dev,
return error;
}
EXPORT_SYMBOL_GPL(dev_pm_qos_add_ancestor_request);
#ifdef CONFIG_PM_RUNTIME
static void __dev_pm_qos_drop_user_request(struct device *dev)
{
dev_pm_qos_remove_request(dev->power.pq_req);
dev->power.pq_req = 0;
}
/**
* dev_pm_qos_expose_latency_limit - Expose PM QoS latency limit to user space.
* @dev: Device whose PM QoS latency limit is to be exposed to user space.
* @value: Initial value of the latency limit.
*/
int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
{
struct dev_pm_qos_request *req;
int ret;
if (!device_is_registered(dev) || value < 0)
return -EINVAL;
if (dev->power.pq_req)
return -EEXIST;
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req)
return -ENOMEM;
ret = dev_pm_qos_add_request(dev, req, value);
if (ret < 0)
return ret;
dev->power.pq_req = req;
ret = pm_qos_sysfs_add(dev);
if (ret)
__dev_pm_qos_drop_user_request(dev);
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit);
/**
* dev_pm_qos_hide_latency_limit - Hide PM QoS latency limit from user space.
* @dev: Device whose PM QoS latency limit is to be hidden from user space.
*/
void dev_pm_qos_hide_latency_limit(struct device *dev)
{
if (dev->power.pq_req) {
pm_qos_sysfs_remove(dev);
__dev_pm_qos_drop_user_request(dev);
}
}
EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_limit);
#endif /* CONFIG_PM_RUNTIME */

47
drivers/base/power/sysfs.c
View file

@ -5,6 +5,7 @@
#include <linux/device.h>
#include <linux/string.h>
#include <linux/export.h>
#include <linux/pm_qos.h>
#include <linux/pm_runtime.h>
#include <linux/atomic.h>
#include <linux/jiffies.h>
@ -217,6 +218,31 @@ static ssize_t autosuspend_delay_ms_store(struct device *dev,
static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show,
autosuspend_delay_ms_store);
static ssize_t pm_qos_latency_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", dev->power.pq_req->node.prio);
}
static ssize_t pm_qos_latency_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t n)
{
s32 value;
int ret;
if (kstrtos32(buf, 0, &value))
return -EINVAL;
if (value < 0)
return -EINVAL;
ret = dev_pm_qos_update_request(dev->power.pq_req, value);
return ret < 0 ? ret : n;
}
static DEVICE_ATTR(pm_qos_resume_latency_us, 0644,
pm_qos_latency_show, pm_qos_latency_store);
#endif /* CONFIG_PM_RUNTIME */
#ifdef CONFIG_PM_SLEEP
@ -490,6 +516,17 @@ static struct attribute_group pm_runtime_attr_group = {
.attrs = runtime_attrs,
};
static struct attribute *pm_qos_attrs[] = {
#ifdef CONFIG_PM_RUNTIME
&dev_attr_pm_qos_resume_latency_us.attr,
#endif /* CONFIG_PM_RUNTIME */
NULL,
};
static struct attribute_group pm_qos_attr_group = {
.name = power_group_name,
.attrs = pm_qos_attrs,
};
int dpm_sysfs_add(struct device *dev)
{
int rc;
@ -530,6 +567,16 @@ void wakeup_sysfs_remove(struct device *dev)
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
}
int pm_qos_sysfs_add(struct device *dev)
{
return sysfs_merge_group(&dev->kobj, &pm_qos_attr_group);
}
void pm_qos_sysfs_remove(struct device *dev)
{
sysfs_unmerge_group(&dev->kobj, &pm_qos_attr_group);
}
void rpm_sysfs_remove(struct device *dev)
{
sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);

85
drivers/base/power/wakeup.c
View file

@ -52,6 +52,23 @@ static void pm_wakeup_timer_fn(unsigned long data);
static LIST_HEAD(wakeup_sources);
/**
* wakeup_source_prepare - Prepare a new wakeup source for initialization.
* @ws: Wakeup source to prepare.
* @name: Pointer to the name of the new wakeup source.
*
* Callers must ensure that the @name string won't be freed when @ws is still in
* use.
*/
void wakeup_source_prepare(struct wakeup_source *ws, const char *name)
{
if (ws) {
memset(ws, 0, sizeof(*ws));
ws->name = name;
}
}
EXPORT_SYMBOL_GPL(wakeup_source_prepare);
/**
* wakeup_source_create - Create a struct wakeup_source object.
* @name: Name of the new wakeup source.
@ -60,37 +77,44 @@ struct wakeup_source *wakeup_source_create(const char *name)
{
struct wakeup_source *ws;
ws = kzalloc(sizeof(*ws), GFP_KERNEL);
ws = kmalloc(sizeof(*ws), GFP_KERNEL);
if (!ws)
return NULL;
spin_lock_init(&ws->lock);
if (name)
ws->name = kstrdup(name, GFP_KERNEL);
wakeup_source_prepare(ws, name ? kstrdup(name, GFP_KERNEL) : NULL);
return ws;
}
EXPORT_SYMBOL_GPL(wakeup_source_create);
/**
* wakeup_source_drop - Prepare a struct wakeup_source object for destruction.
* @ws: Wakeup source to prepare for destruction.
*
* Callers must ensure that __pm_stay_awake() or __pm_wakeup_event() will never
* be run in parallel with this function for the same wakeup source object.
*/
void wakeup_source_drop(struct wakeup_source *ws)
{
if (!ws)
return;
del_timer_sync(&ws->timer);
__pm_relax(ws);
}
EXPORT_SYMBOL_GPL(wakeup_source_drop);
/**
* wakeup_source_destroy - Destroy a struct wakeup_source object.
* @ws: Wakeup source to destroy.
*
* Use only for wakeup source objects created with wakeup_source_create().
*/
void wakeup_source_destroy(struct wakeup_source *ws)
{
if (!ws)
return;
spin_lock_irq(&ws->lock);
while (ws->active) {
spin_unlock_irq(&ws->lock);
schedule_timeout_interruptible(msecs_to_jiffies(TIMEOUT));
spin_lock_irq(&ws->lock);
}
spin_unlock_irq(&ws->lock);
wakeup_source_drop(ws);
kfree(ws->name);
kfree(ws);
}
@ -105,6 +129,7 @@ void wakeup_source_add(struct wakeup_source *ws)
if (WARN_ON(!ws))
return;
spin_lock_init(&ws->lock);
setup_timer(&ws->timer, pm_wakeup_timer_fn, (unsigned long)ws);
ws->active = false;
@ -152,8 +177,10 @@ EXPORT_SYMBOL_GPL(wakeup_source_register);
*/
void wakeup_source_unregister(struct wakeup_source *ws)
{
wakeup_source_remove(ws);
wakeup_source_destroy(ws);
if (ws) {
wakeup_source_remove(ws);
wakeup_source_destroy(ws);
}
}
EXPORT_SYMBOL_GPL(wakeup_source_unregister);
@ -349,7 +376,6 @@ static void wakeup_source_activate(struct wakeup_source *ws)
{
ws->active = true;
ws->active_count++;
ws->timer_expires = jiffies;
ws->last_time = ktime_get();
/* Increment the counter of events in progress. */
@ -370,9 +396,14 @@ void __pm_stay_awake(struct wakeup_source *ws)
return;
spin_lock_irqsave(&ws->lock, flags);
ws->event_count++;
if (!ws->active)
wakeup_source_activate(ws);
del_timer(&ws->timer);
ws->timer_expires = 0;
spin_unlock_irqrestore(&ws->lock, flags);
}
EXPORT_SYMBOL_GPL(__pm_stay_awake);
@ -438,6 +469,7 @@ static void wakeup_source_deactivate(struct wakeup_source *ws)
ws->max_time = duration;
del_timer(&ws->timer);
ws->timer_expires = 0;
/*
* Increment the counter of registered wakeup events and decrement the
@ -492,11 +524,22 @@ EXPORT_SYMBOL_GPL(pm_relax);
* pm_wakeup_timer_fn - Delayed finalization of a wakeup event.
* @data: Address of the wakeup source object associated with the event source.
*
* Call __pm_relax() for the wakeup source whose address is stored in @data.
* Call wakeup_source_deactivate() for the wakeup source whose address is stored
* in @data if it is currently active and its timer has not been canceled and
* the expiration time of the timer is not in future.
*/
static void pm_wakeup_timer_fn(unsigned long data)
{
__pm_relax((struct wakeup_source *)data);
struct wakeup_source *ws = (struct wakeup_source *)data;
unsigned long flags;
spin_lock_irqsave(&ws->lock, flags);
if (ws->active && ws->timer_expires
&& time_after_eq(jiffies, ws->timer_expires))
wakeup_source_deactivate(ws);
spin_unlock_irqrestore(&ws->lock, flags);
}
/**
@ -534,7 +577,7 @@ void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec)
if (!expires)
expires = 1;
if (time_after(expires, ws->timer_expires)) {
if (!ws->timer_expires || time_after(expires, ws->timer_expires)) {
mod_timer(&ws->timer, expires);
ws->timer_expires = expires;
}