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-rw-r--r--drivers/base/dd.c11
-rw-r--r--drivers/base/platform.c84
-rw-r--r--drivers/base/power/Makefile1
-rw-r--r--drivers/base/power/main.c199
-rw-r--r--drivers/base/power/power.h31
-rw-r--r--drivers/base/power/runtime.c1011
6 files changed, 1195 insertions, 142 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index f0106875f01..7b34b3a48f6 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -23,6 +23,7 @@
#include <linux/kthread.h>
#include <linux/wait.h>
#include <linux/async.h>
+#include <linux/pm_runtime.h>
#include "base.h"
#include "power/power.h"
@@ -202,7 +203,10 @@ int driver_probe_device(struct device_driver *drv, struct device *dev)
pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
drv->bus->name, __func__, dev_name(dev), drv->name);
+ pm_runtime_get_noresume(dev);
+ pm_runtime_barrier(dev);
ret = really_probe(dev, drv);
+ pm_runtime_put_sync(dev);
return ret;
}
@@ -245,7 +249,9 @@ int device_attach(struct device *dev)
ret = 0;
}
} else {
+ pm_runtime_get_noresume(dev);
ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach);
+ pm_runtime_put_sync(dev);
}
up(&dev->sem);
return ret;
@@ -306,6 +312,9 @@ static void __device_release_driver(struct device *dev)
drv = dev->driver;
if (drv) {
+ pm_runtime_get_noresume(dev);
+ pm_runtime_barrier(dev);
+
driver_sysfs_remove(dev);
if (dev->bus)
@@ -324,6 +333,8 @@ static void __device_release_driver(struct device *dev)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_UNBOUND_DRIVER,
dev);
+
+ pm_runtime_put_sync(dev);
}
}
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 456594bd97b..0f7d434ce98 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -17,6 +17,7 @@
#include <linux/bootmem.h>
#include <linux/err.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include "base.h"
@@ -625,30 +626,6 @@ static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
return ret;
}
-static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg)
-{
- struct platform_driver *pdrv = to_platform_driver(dev->driver);
- struct platform_device *pdev = to_platform_device(dev);
- int ret = 0;
-
- if (dev->driver && pdrv->suspend_late)
- ret = pdrv->suspend_late(pdev, mesg);
-
- return ret;
-}
-
-static int platform_legacy_resume_early(struct device *dev)
-{
- struct platform_driver *pdrv = to_platform_driver(dev->driver);
- struct platform_device *pdev = to_platform_device(dev);
- int ret = 0;
-
- if (dev->driver && pdrv->resume_early)
- ret = pdrv->resume_early(pdev);
-
- return ret;
-}
-
static int platform_legacy_resume(struct device *dev)
{
struct platform_driver *pdrv = to_platform_driver(dev->driver);
@@ -680,6 +657,13 @@ static void platform_pm_complete(struct device *dev)
drv->pm->complete(dev);
}
+#else /* !CONFIG_PM_SLEEP */
+
+#define platform_pm_prepare NULL
+#define platform_pm_complete NULL
+
+#endif /* !CONFIG_PM_SLEEP */
+
#ifdef CONFIG_SUSPEND
static int platform_pm_suspend(struct device *dev)
@@ -711,8 +695,6 @@ static int platform_pm_suspend_noirq(struct device *dev)
if (drv->pm) {
if (drv->pm->suspend_noirq)
ret = drv->pm->suspend_noirq(dev);
- } else {
- ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND);
}
return ret;
@@ -747,8 +729,6 @@ static int platform_pm_resume_noirq(struct device *dev)
if (drv->pm) {
if (drv->pm->resume_noirq)
ret = drv->pm->resume_noirq(dev);
- } else {
- ret = platform_legacy_resume_early(dev);
}
return ret;
@@ -794,8 +774,6 @@ static int platform_pm_freeze_noirq(struct device *dev)
if (drv->pm) {
if (drv->pm->freeze_noirq)
ret = drv->pm->freeze_noirq(dev);
- } else {
- ret = platform_legacy_suspend_late(dev, PMSG_FREEZE);
}
return ret;
@@ -830,8 +808,6 @@ static int platform_pm_thaw_noirq(struct device *dev)
if (drv->pm) {
if (drv->pm->thaw_noirq)
ret = drv->pm->thaw_noirq(dev);
- } else {
- ret = platform_legacy_resume_early(dev);
}
return ret;
@@ -866,8 +842,6 @@ static int platform_pm_poweroff_noirq(struct device *dev)
if (drv->pm) {
if (drv->pm->poweroff_noirq)
ret = drv->pm->poweroff_noirq(dev);
- } else {
- ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE);
}
return ret;
@@ -902,8 +876,6 @@ static int platform_pm_restore_noirq(struct device *dev)
if (drv->pm) {
if (drv->pm->restore_noirq)
ret = drv->pm->restore_noirq(dev);
- } else {
- ret = platform_legacy_resume_early(dev);
}
return ret;
@@ -922,7 +894,32 @@ static int platform_pm_restore_noirq(struct device *dev)
#endif /* !CONFIG_HIBERNATION */
-static struct dev_pm_ops platform_dev_pm_ops = {
+#ifdef CONFIG_PM_RUNTIME
+
+int __weak platform_pm_runtime_suspend(struct device *dev)
+{
+ return -ENOSYS;
+};
+
+int __weak platform_pm_runtime_resume(struct device *dev)
+{
+ return -ENOSYS;
+};
+
+int __weak platform_pm_runtime_idle(struct device *dev)
+{
+ return -ENOSYS;
+};
+
+#else /* !CONFIG_PM_RUNTIME */
+
+#define platform_pm_runtime_suspend NULL
+#define platform_pm_runtime_resume NULL
+#define platform_pm_runtime_idle NULL
+
+#endif /* !CONFIG_PM_RUNTIME */
+
+static const struct dev_pm_ops platform_dev_pm_ops = {
.prepare = platform_pm_prepare,
.complete = platform_pm_complete,
.suspend = platform_pm_suspend,
@@ -937,22 +934,17 @@ static struct dev_pm_ops platform_dev_pm_ops = {
.thaw_noirq = platform_pm_thaw_noirq,
.poweroff_noirq = platform_pm_poweroff_noirq,
.restore_noirq = platform_pm_restore_noirq,
+ .runtime_suspend = platform_pm_runtime_suspend,
+ .runtime_resume = platform_pm_runtime_resume,
+ .runtime_idle = platform_pm_runtime_idle,
};
-#define PLATFORM_PM_OPS_PTR (&platform_dev_pm_ops)
-
-#else /* !CONFIG_PM_SLEEP */
-
-#define PLATFORM_PM_OPS_PTR NULL
-
-#endif /* !CONFIG_PM_SLEEP */
-
struct bus_type platform_bus_type = {
.name = "platform",
.dev_attrs = platform_dev_attrs,
.match = platform_match,
.uevent = platform_uevent,
- .pm = PLATFORM_PM_OPS_PTR,
+ .pm = &platform_dev_pm_ops,
};
EXPORT_SYMBOL_GPL(platform_bus_type);
diff --git a/drivers/base/power/Makefile b/drivers/base/power/Makefile
index 911208b8925..3ce3519e8f3 100644
--- a/drivers/base/power/Makefile
+++ b/drivers/base/power/Makefile
@@ -1,5 +1,6 @@
obj-$(CONFIG_PM) += sysfs.o
obj-$(CONFIG_PM_SLEEP) += main.o
+obj-$(CONFIG_PM_RUNTIME) += runtime.o
obj-$(CONFIG_PM_TRACE_RTC) += trace.o
ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 58a3e572f2c..e0dc4071e08 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -21,6 +21,7 @@
#include <linux/kallsyms.h>
#include <linux/mutex.h>
#include <linux/pm.h>
+#include <linux/pm_runtime.h>
#include <linux/resume-trace.h>
#include <linux/rwsem.h>
#include <linux/interrupt.h>
@@ -49,7 +50,17 @@ static DEFINE_MUTEX(dpm_list_mtx);
static bool transition_started;
/**
- * device_pm_lock - lock the list of active devices used by the PM core
+ * device_pm_init - Initialize the PM-related part of a device object.
+ * @dev: Device object being initialized.
+ */
+void device_pm_init(struct device *dev)
+{
+ dev->power.status = DPM_ON;
+ pm_runtime_init(dev);
+}
+
+/**
+ * device_pm_lock - Lock the list of active devices used by the PM core.
*/
void device_pm_lock(void)
{
@@ -57,7 +68,7 @@ void device_pm_lock(void)
}
/**
- * device_pm_unlock - unlock the list of active devices used by the PM core
+ * device_pm_unlock - Unlock the list of active devices used by the PM core.
*/
void device_pm_unlock(void)
{
@@ -65,8 +76,8 @@ void device_pm_unlock(void)
}
/**
- * device_pm_add - add a device to the list of active devices
- * @dev: Device to be added to the list
+ * device_pm_add - Add a device to the PM core's list of active devices.
+ * @dev: Device to add to the list.
*/
void device_pm_add(struct device *dev)
{
@@ -92,10 +103,8 @@ void device_pm_add(struct device *dev)
}
/**
- * device_pm_remove - remove a device from the list of active devices
- * @dev: Device to be removed from the list
- *
- * This function also removes the device's PM-related sysfs attributes.
+ * device_pm_remove - Remove a device from the PM core's list of active devices.
+ * @dev: Device to be removed from the list.
*/
void device_pm_remove(struct device *dev)
{
@@ -105,12 +114,13 @@ void device_pm_remove(struct device *dev)
mutex_lock(&dpm_list_mtx);
list_del_init(&dev->power.entry);
mutex_unlock(&dpm_list_mtx);
+ pm_runtime_remove(dev);
}
/**
- * device_pm_move_before - move device in dpm_list
- * @deva: Device to move in dpm_list
- * @devb: Device @deva should come before
+ * device_pm_move_before - Move device in the PM core's list of active devices.
+ * @deva: Device to move in dpm_list.
+ * @devb: Device @deva should come before.
*/
void device_pm_move_before(struct device *deva, struct device *devb)
{
@@ -124,9 +134,9 @@ void device_pm_move_before(struct device *deva, struct device *devb)
}
/**
- * device_pm_move_after - move device in dpm_list
- * @deva: Device to move in dpm_list
- * @devb: Device @deva should come after
+ * device_pm_move_after - Move device in the PM core's list of active devices.
+ * @deva: Device to move in dpm_list.
+ * @devb: Device @deva should come after.
*/
void device_pm_move_after(struct device *deva, struct device *devb)
{
@@ -140,8 +150,8 @@ void device_pm_move_after(struct device *deva, struct device *devb)
}
/**
- * device_pm_move_last - move device to end of dpm_list
- * @dev: Device to move in dpm_list
+ * device_pm_move_last - Move device to end of the PM core's list of devices.
+ * @dev: Device to move in dpm_list.
*/
void device_pm_move_last(struct device *dev)
{
@@ -152,13 +162,14 @@ void device_pm_move_last(struct device *dev)
}
/**
- * pm_op - execute the PM operation appropiate for given PM event
- * @dev: Device.
- * @ops: PM operations to choose from.
- * @state: PM transition of the system being carried out.
+ * pm_op - Execute the PM operation appropriate for given PM event.
+ * @dev: Device to handle.
+ * @ops: PM operations to choose from.
+ * @state: PM transition of the system being carried out.
*/
-static int pm_op(struct device *dev, struct dev_pm_ops *ops,
- pm_message_t state)
+static int pm_op(struct device *dev,
+ const struct dev_pm_ops *ops,
+ pm_message_t state)
{
int error = 0;
@@ -212,15 +223,16 @@ static int pm_op(struct device *dev, struct dev_pm_ops *ops,
}
/**
- * pm_noirq_op - execute the PM operation appropiate for given PM event
- * @dev: Device.
- * @ops: PM operations to choose from.
- * @state: PM transition of the system being carried out.
+ * pm_noirq_op - Execute the PM operation appropriate for given PM event.
+ * @dev: Device to handle.
+ * @ops: PM operations to choose from.
+ * @state: PM transition of the system being carried out.
*
- * The operation is executed with interrupts disabled by the only remaining
- * functional CPU in the system.
+ * The driver of @dev will not receive interrupts while this function is being
+ * executed.
*/
-static int pm_noirq_op(struct device *dev, struct dev_pm_ops *ops,
+static int pm_noirq_op(struct device *dev,
+ const struct dev_pm_ops *ops,
pm_message_t state)
{
int error = 0;
@@ -315,11 +327,12 @@ static void pm_dev_err(struct device *dev, pm_message_t state, char *info,
/*------------------------- Resume routines -------------------------*/
/**
- * device_resume_noirq - Power on one device (early resume).
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_resume_noirq - Execute an "early resume" callback for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
*
- * Must be called with interrupts disabled.
+ * 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)
{
@@ -341,20 +354,18 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
}
/**
- * dpm_resume_noirq - Power on all regular (non-sysdev) devices.
- * @state: PM transition of the system being carried out.
- *
- * Call the "noirq" resume handlers for all devices marked as
- * DPM_OFF_IRQ and enable device drivers to receive interrupts.
+ * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices.
+ * @state: PM transition of the system being carried out.
*
- * Must be called under dpm_list_mtx. Device drivers should not receive
- * interrupts while it's being executed.
+ * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and
+ * enable device drivers to receive interrupts.
*/
void dpm_resume_noirq(pm_message_t state)
{
struct device *dev;
mutex_lock(&dpm_list_mtx);
+ transition_started = false;
list_for_each_entry(dev, &dpm_list, power.entry)
if (dev->power.status > DPM_OFF) {
int error;
@@ -370,9 +381,9 @@ void dpm_resume_noirq(pm_message_t state)
EXPORT_SYMBOL_GPL(dpm_resume_noirq);
/**
- * device_resume - Restore state for one device.
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_resume - Execute "resume" callbacks for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
*/
static int device_resume(struct device *dev, pm_message_t state)
{
@@ -421,11 +432,11 @@ static int device_resume(struct device *dev, pm_message_t state)
}
/**
- * dpm_resume - Resume every device.
- * @state: PM transition of the system being carried out.
+ * dpm_resume - Execute "resume" callbacks for non-sysdev devices.
+ * @state: PM transition of the system being carried out.
*
- * Execute the appropriate "resume" callback for all devices the status of
- * which indicates that they are inactive.
+ * Execute the appropriate "resume" callback for all devices whose status
+ * indicates that they are suspended.
*/
static void dpm_resume(pm_message_t state)
{
@@ -433,7 +444,6 @@ static void dpm_resume(pm_message_t state)
INIT_LIST_HEAD(&list);
mutex_lock(&dpm_list_mtx);
- transition_started = false;
while (!list_empty(&dpm_list)) {
struct device *dev = to_device(dpm_list.next);
@@ -462,9 +472,9 @@ static void dpm_resume(pm_message_t state)
}
/**
- * device_complete - Complete a PM transition for given device
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_complete - Complete a PM transition for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
*/
static void device_complete(struct device *dev, pm_message_t state)
{
@@ -489,11 +499,11 @@ static void device_complete(struct device *dev, pm_message_t state)
}
/**
- * dpm_complete - Complete a PM transition for all devices.
- * @state: PM transition of the system being carried out.
+ * dpm_complete - Complete a PM transition for all non-sysdev devices.
+ * @state: PM transition of the system being carried out.
*
- * Execute the ->complete() callbacks for all devices that are not marked
- * as DPM_ON.
+ * Execute the ->complete() callbacks for all devices whose PM status is not
+ * DPM_ON (this allows new devices to be registered).
*/
static void dpm_complete(pm_message_t state)
{
@@ -510,6 +520,7 @@ static void dpm_complete(pm_message_t state)
mutex_unlock(&dpm_list_mtx);
device_complete(dev, state);
+ pm_runtime_put_noidle(dev);
mutex_lock(&dpm_list_mtx);
}
@@ -522,11 +533,11 @@ static void dpm_complete(pm_message_t state)
}
/**
- * dpm_resume_end - Restore state of each device in system.
- * @state: PM transition of the system being carried out.
+ * dpm_resume_end - Execute "resume" callbacks and complete system transition.
+ * @state: PM transition of the system being carried out.
*
- * Resume all the devices, unlock them all, and allow new
- * devices to be registered once again.
+ * Execute "resume" callbacks for all devices and complete the PM transition of
+ * the system.
*/
void dpm_resume_end(pm_message_t state)
{
@@ -540,9 +551,11 @@ EXPORT_SYMBOL_GPL(dpm_resume_end);
/*------------------------- Suspend routines -------------------------*/
/**
- * resume_event - return a PM message representing the resume event
- * corresponding to given sleep state.
- * @sleep_state: PM message representing a sleep state.
+ * resume_event - Return a "resume" message for given "suspend" sleep state.
+ * @sleep_state: PM message representing a sleep state.
+ *
+ * Return a PM message representing the resume event corresponding to given
+ * sleep state.
*/
static pm_message_t resume_event(pm_message_t sleep_state)
{
@@ -559,11 +572,12 @@ static pm_message_t resume_event(pm_message_t sleep_state)
}
/**
- * device_suspend_noirq - Shut down one device (late suspend).
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_suspend_noirq - Execute a "late suspend" callback for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
*
- * This is called with interrupts off and only a single CPU running.
+ * 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)
{
@@ -580,13 +594,11 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
}
/**
- * dpm_suspend_noirq - Power down all regular (non-sysdev) devices.
- * @state: PM transition of the system being carried out.
- *
- * Prevent device drivers from receiving interrupts and call the "noirq"
- * suspend handlers.
+ * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices.
+ * @state: PM transition of the system being carried out.
*
- * Must be called under dpm_list_mtx.
+ * 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)
{
@@ -611,9 +623,9 @@ int dpm_suspend_noirq(pm_message_t state)
EXPORT_SYMBOL_GPL(dpm_suspend_noirq);
/**
- * device_suspend - Save state of one device.
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_suspend - Execute "suspend" callbacks for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
*/
static int device_suspend(struct device *dev, pm_message_t state)
{
@@ -660,10 +672,8 @@ static int device_suspend(struct device *dev, pm_message_t state)
}
/**
- * dpm_suspend - Suspend every device.
- * @state: PM transition of the system being carried out.
- *
- * Execute the appropriate "suspend" callbacks for all devices.
+ * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices.
+ * @state: PM transition of the system being carried out.
*/
static int dpm_suspend(pm_message_t state)
{
@@ -697,9 +707,12 @@ static int dpm_suspend(pm_message_t state)
}
/**
- * device_prepare - Execute the ->prepare() callback(s) for given device.
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_prepare - Prepare a device for system power transition.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
+ *
+ * Execute the ->prepare() callback(s) for given device. No new children of the
+ * device may be registered after this function has returned.
*/
static int device_prepare(struct device *dev, pm_message_t state)
{
@@ -735,10 +748,10 @@ static int device_prepare(struct device *dev, pm_message_t state)
}
/**
- * dpm_prepare - Prepare all devices for a PM transition.
- * @state: PM transition of the system being carried out.
+ * dpm_prepare - Prepare all non-sysdev devices for a system PM transition.
+ * @state: PM transition of the system being carried out.
*
- * Execute the ->prepare() callback for all devices.
+ * Execute the ->prepare() callback(s) for all devices.
*/
static int dpm_prepare(pm_message_t state)
{
@@ -755,7 +768,14 @@ static int dpm_prepare(pm_message_t state)
dev->power.status = DPM_PREPARING;
mutex_unlock(&dpm_list_mtx);
- error = device_prepare(dev, state);
+ pm_runtime_get_noresume(dev);
+ if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) {
+ /* Wake-up requested during system sleep transition. */
+ pm_runtime_put_noidle(dev);
+ error = -EBUSY;
+ } else {
+ error = device_prepare(dev, state);
+ }
mutex_lock(&dpm_list_mtx);
if (error) {
@@ -782,10 +802,11 @@ static int dpm_prepare(pm_message_t state)
}
/**
- * dpm_suspend_start - Save state and stop all devices in system.
- * @state: PM transition of the system being carried out.
+ * dpm_suspend_start - Prepare devices for PM transition and suspend them.
+ * @state: PM transition of the system being carried out.
*
- * Prepare and suspend all devices.
+ * Prepare all non-sysdev devices for system PM transition and execute "suspend"
+ * callbacks for them.
*/
int dpm_suspend_start(pm_message_t state)
{
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index c7cb4fc3735..b8fa1aa5225 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -1,7 +1,14 @@
-static inline void device_pm_init(struct device *dev)
-{
- dev->power.status = DPM_ON;
-}
+#ifdef CONFIG_PM_RUNTIME
+
+extern void pm_runtime_init(struct device *dev);
+extern void pm_runtime_remove(struct device *dev);
+
+#else /* !CONFIG_PM_RUNTIME */
+
+static inline void pm_runtime_init(struct device *dev) {}
+static inline void pm_runtime_remove(struct device *dev) {}
+
+#endif /* !CONFIG_PM_RUNTIME */
#ifdef CONFIG_PM_SLEEP
@@ -16,23 +23,33 @@ static inline struct device *to_device(struct list_head *entry)
return container_of(entry, struct device, power.entry);
}
+extern void device_pm_init(struct device *dev);
extern void device_pm_add(struct device *);
extern void device_pm_remove(struct device *);
extern void device_pm_move_before(struct device *, struct device *);
extern void device_pm_move_after(struct device *, struct device *);
extern void device_pm_move_last(struct device *);
-#else /* CONFIG_PM_SLEEP */
+#else /* !CONFIG_PM_SLEEP */
+
+static inline void device_pm_init(struct device *dev)
+{
+ pm_runtime_init(dev);
+}
+
+static inline void device_pm_remove(struct device *dev)
+{
+ pm_runtime_remove(dev);
+}
static inline void device_pm_add(struct device *dev) {}
-static inline void device_pm_remove(struct device *dev) {}
static inline void device_pm_move_before(struct device *deva,
struct device *devb) {}
static inline void device_pm_move_after(struct device *deva,
struct device *devb) {}
static inline void device_pm_move_last(struct device *dev) {}
-#endif
+#endif /* !CONFIG_PM_SLEEP */
#ifdef CONFIG_PM
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
new file mode 100644
index 00000000000..38556f6cc22
--- /dev/null
+++ b/drivers/base/power/runtime.c
@@ -0,0 +1,1011 @@
+/*
+ * drivers/base/power/runtime.c - Helper functions for device run-time PM
+ *
+ * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/sched.h>
+#include <linux/pm_runtime.h>
+#include <linux/jiffies.h>
+
+static int __pm_runtime_resume(struct device *dev, bool from_wq);
+static int __pm_request_idle(struct device *dev);
+static int __pm_request_resume(struct device *dev);
+
+/**
+ * pm_runtime_deactivate_timer - Deactivate given device's suspend timer.
+ * @dev: Device to handle.
+ */
+static void pm_runtime_deactivate_timer(struct device *dev)
+{
+ if (dev->power.timer_expires > 0) {
+ del_timer(&dev->power.suspend_timer);
+ dev->power.timer_expires = 0;
+ }
+}
+
+/**
+ * pm_runtime_cancel_pending - Deactivate suspend timer and cancel requests.
+ * @dev: Device to handle.
+ */
+static void pm_runtime_cancel_pending(struct device *dev)
+{
+ pm_runtime_deactivate_timer(dev);
+ /*
+ * In case there's a request pending, make sure its work function will
+ * return without doing anything.
+ */
+ dev->power.request = RPM_REQ_NONE;
+}
+
+/**
+ * __pm_runtime_idle - Notify device bus type if the device can be suspended.
+ * @dev: Device to notify the bus type about.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+static int __pm_runtime_idle(struct device *dev)
+ __releases(&dev->power.lock) __acquires(&dev->power.lock)
+{
+ int retval = 0;
+
+ dev_dbg(dev, "__pm_runtime_idle()!\n");
+
+ if (dev->power.runtime_error)
+ retval = -EINVAL;
+ else if (dev->power.idle_notification)
+ retval = -EINPROGRESS;
+ else if (atomic_read(&dev->power.usage_count) > 0
+ || dev->power.disable_depth > 0
+ || dev->power.runtime_status != RPM_ACTIVE)
+ retval = -EAGAIN;
+ else if (!pm_children_suspended(dev))
+ retval = -EBUSY;
+ if (retval)
+ goto out;
+
+ if (dev->power.request_pending) {
+ /*
+ * If an idle notification request is pending, cancel it. Any
+ * other pending request takes precedence over us.
+ */
+ if (dev->power.request == RPM_REQ_IDLE) {
+ dev->power.request = RPM_REQ_NONE;
+ } else if (dev->power.request != RPM_REQ_NONE) {
+ retval = -EAGAIN;
+ goto out;
+ }
+ }
+
+ dev->power.idle_notification = true;
+
+ if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_idle) {
+ spin_unlock_irq(&dev->power.lock);
+
+ dev->bus->pm->runtime_idle(dev);
+
+ spin_lock_irq(&dev->power.lock);
+ }
+
+ dev->power.idle_notification = false;
+ wake_up_all(&dev->power.wait_queue);
+
+ out:
+ dev_dbg(dev, "__pm_runtime_idle() returns %d!\n", retval);
+
+ return retval;
+}
+
+/**
+ * pm_runtime_idle - Notify device bus type if the device can be suspended.
+ * @dev: Device to notify the bus type about.
+ */
+int pm_runtime_idle(struct device *dev)
+{
+ int retval;
+
+ spin_lock_irq(&dev->power.lock);
+ retval = __pm_runtime_idle(dev);
+ spin_unlock_irq(&dev->power.lock);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_runtime_idle);
+
+/**
+ * __pm_runtime_suspend - Carry out run-time suspend of given device.
+ * @dev: Device to suspend.
+ * @from_wq: If set, the function has been called via pm_wq.
+ *
+ * Check if the device can be suspended and run the ->runtime_suspend() callback
+ * provided by its bus type. If another suspend has been started earlier, wait
+ * for it to finish. If an idle notification or suspend request is pending or
+ * scheduled, cancel it.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+int __pm_runtime_suspend(struct device *dev, bool from_wq)
+ __releases(&dev->power.lock) __acquires(&dev->power.lock)
+{
+ struct device *parent = NULL;
+ bool notify = false;
+ int retval = 0;
+
+ dev_dbg(dev, "__pm_runtime_suspend()%s!\n",
+ from_wq ? " from workqueue" : "");
+
+ repeat:
+ if (dev->power.runtime_error) {
+ retval = -EINVAL;
+ goto out;
+ }
+
+ /* Pending resume requests take precedence over us. */
+ if (dev->power.request_pending
+ && dev->power.request == RPM_REQ_RESUME) {
+ retval = -EAGAIN;
+ goto out;
+ }
+
+ /* Other scheduled or pending requests need to be canceled. */
+ pm_runtime_cancel_pending(dev);
+
+ if (dev->power.runtime_status == RPM_SUSPENDED)
+ retval = 1;
+ else if (dev->power.runtime_status == RPM_RESUMING
+ || dev->power.disable_depth > 0
+ || atomic_read(&dev->power.usage_count) > 0)
+ retval = -EAGAIN;
+ else if (!pm_children_suspended(dev))
+ retval = -EBUSY;
+ if (retval)
+ goto out;
+
+ if (dev->power.runtime_status == RPM_SUSPENDING) {
+ DEFINE_WAIT(wait);
+
+ if (from_wq) {
+ retval = -EINPROGRESS;
+ goto out;
+ }
+
+ /* Wait for the other suspend running in parallel with us. */
+ for (;;) {
+ prepare_to_wait(&dev->power.wait_queue, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (dev->power.runtime_status != RPM_SUSPENDING)
+ break;
+
+ spin_unlock_irq(&dev->power.lock);
+
+ schedule();
+
+ spin_lock_irq(&dev->power.lock);
+ }
+ finish_wait(&dev->power.wait_queue, &wait);
+ goto repeat;
+ }
+
+ dev->power.runtime_status = RPM_SUSPENDING;
+
+ if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_suspend) {
+ spin_unlock_irq(&dev->power.lock);
+
+ retval = dev->bus->pm->runtime_suspend(dev);
+
+ spin_lock_irq(&dev->power.lock);
+ dev->power.runtime_error = retval;
+ } else {
+ retval = -ENOSYS;
+ }
+
+ if (retval) {
+ dev->power.runtime_status = RPM_ACTIVE;
+ pm_runtime_cancel_pending(dev);
+ dev->power.deferred_resume = false;
+
+ if (retval == -EAGAIN || retval == -EBUSY) {
+ notify = true;
+ dev->power.runtime_error = 0;
+ }
+ } else {
+ dev->power.runtime_status = RPM_SUSPENDED;
+
+ if (dev->parent) {
+ parent = dev->parent;
+ atomic_add_unless(&parent->power.child_count, -1, 0);
+ }
+ }
+ wake_up_all(&dev->power.wait_queue);
+
+ if (dev->power.deferred_resume) {
+ dev->power.deferred_resume = false;
+ __pm_runtime_resume(dev, false);
+ retval = -EAGAIN;
+ goto out;
+ }
+
+ if (notify)
+ __pm_runtime_idle(dev);
+
+ if (parent && !parent->power.ignore_children) {
+ spin_unlock_irq(&dev->power.lock);
+
+ pm_request_idle(parent);
+
+ spin_lock_irq(&dev->power.lock);
+ }
+
+ out:
+ dev_dbg(dev, "__pm_runtime_suspend() returns %d!\n", retval);
+
+ return retval;
+}
+
+/**
+ * pm_runtime_suspend - Carry out run-time suspend of given device.
+ * @dev: Device to suspend.
+ */
+int pm_runtime_suspend(struct device *dev)
+{
+ int retval;
+
+ spin_lock_irq(&dev->power.lock);
+ retval = __pm_runtime_suspend(dev, false);
+ spin_unlock_irq(&dev->power.lock);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_runtime_suspend);
+
+/**
+ * __pm_runtime_resume - Carry out run-time resume of given device.
+ * @dev: Device to resume.
+ * @from_wq: If set, the function has been called via pm_wq.
+ *
+ * Check if the device can be woken up and run the ->runtime_resume() callback
+ * provided by its bus type. If another resume has been started earlier, wait
+ * for it to finish. If there's a suspend running in parallel with this
+ * function, wait for it to finish and resume the device. Cancel any scheduled
+ * or pending requests.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+int __pm_runtime_resume(struct device *dev, bool from_wq)
+ __releases(&dev->power.lock) __acquires(&dev->power.lock)
+{
+ struct device *parent = NULL;
+ int retval = 0;
+
+ dev_dbg(dev, "__pm_runtime_resume()%s!\n",
+ from_wq ? " from workqueue" : "");
+
+ repeat:
+ if (dev->power.runtime_error) {
+ retval = -EINVAL;
+ goto out;
+ }
+
+ pm_runtime_cancel_pending(dev);
+
+ if (dev->power.runtime_status == RPM_ACTIVE)
+ retval = 1;
+ else if (dev->power.disable_depth > 0)
+ retval = -EAGAIN;
+ if (retval)
+ goto out;
+
+ if (dev->power.runtime_status == RPM_RESUMING
+ || dev->power.runtime_status == RPM_SUSPENDING) {
+ DEFINE_WAIT(wait);
+
+ if (from_wq) {
+ if (dev->power.runtime_status == RPM_SUSPENDING)
+ dev->power.deferred_resume = true;
+ retval = -EINPROGRESS;
+ goto out;
+ }
+
+ /* Wait for the operation carried out in parallel with us. */
+ for (;;) {
+ prepare_to_wait(&dev->power.wait_queue, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (dev->power.runtime_status != RPM_RESUMING
+ && dev->power.runtime_status != RPM_SUSPENDING)
+ break;
+
+ spin_unlock_irq(&dev->power.lock);
+
+ schedule();
+
+ spin_lock_irq(&dev->power.lock);
+ }
+ finish_wait(&dev->power.wait_queue, &wait);
+ goto repeat;
+ }
+
+ if (!parent && dev->parent) {
+ /*
+ * Increment the parent's resume counter and resume it if
+ * necessary.
+ */
+ parent = dev->parent;
+ spin_unlock_irq(&dev->power.lock);
+
+ pm_runtime_get_noresume(parent);
+
+ spin_lock_irq(&parent->power.lock);
+ /*
+ * We can resume if the parent's run-time PM is disabled or it
+ * is set to ignore children.
+ */
+ if (!parent->power.disable_depth
+ && !parent->power.ignore_children) {
+ __pm_runtime_resume(parent, false);
+ if (parent->power.runtime_status != RPM_ACTIVE)
+ retval = -EBUSY;
+ }
+ spin_unlock_irq(&parent->power.lock);
+
+ spin_lock_irq(&dev->power.lock);
+ if (retval)
+ goto out;
+ goto repeat;
+ }
+
+ dev->power.runtime_status = RPM_RESUMING;
+
+ if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_resume) {
+ spin_unlock_irq(&dev->power.lock);
+
+ retval = dev->bus->pm->runtime_resume(dev);
+
+ spin_lock_irq(&dev->power.lock);
+ dev->power.runtime_error = retval;
+ } else {
+ retval = -ENOSYS;
+ }
+
+ if (retval) {
+ dev->power.runtime_status = RPM_SUSPENDED;
+ pm_runtime_cancel_pending(dev);
+ } else {
+ dev->power.runtime_status = RPM_ACTIVE;
+ if (parent)
+ atomic_inc(&parent->power.child_count);
+ }
+ wake_up_all(&dev->power.wait_queue);
+
+ if (!retval)
+ __pm_request_idle(dev);
+
+ out:
+ if (parent) {
+ spin_unlock_irq(&dev->power.lock);
+
+ pm_runtime_put(parent);
+
+ spin_lock_irq(&dev->power.lock);
+ }
+
+ dev_dbg(dev, "__pm_runtime_resume() returns %d!\n", retval);
+
+ return retval;
+}
+
+/**
+ * pm_runtime_resume - Carry out run-time resume of given device.
+ * @dev: Device to suspend.
+ */
+int pm_runtime_resume(struct device *dev)
+{
+ int retval;
+
+ spin_lock_irq(&dev->power.lock);
+ retval = __pm_runtime_resume(dev, false);
+ spin_unlock_irq(&dev->power.lock);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_runtime_resume);
+
+/**
+ * pm_runtime_work - Universal run-time PM work function.
+ * @work: Work structure used for scheduling the execution of this function.
+ *
+ * Use @work to get the device object the work is to be done for, determine what
+ * is to be done and execute the appropriate run-time PM function.
+ */
+static void pm_runtime_work(struct work_struct *work)
+{
+ struct device *dev = container_of(work, struct device, power.work);
+ enum rpm_request req;
+
+ spin_lock_irq(&dev->power.lock);
+
+ if (!dev->power.request_pending)
+ goto out;
+
+ req = dev->power.request;
+ dev->power.request = RPM_REQ_NONE;
+ dev->power.request_pending = false;
+
+ switch (req) {
+ case RPM_REQ_NONE:
+ break;
+ case RPM_REQ_IDLE:
+ __pm_runtime_idle(dev);
+ break;
+ case RPM_REQ_SUSPEND:
+ __pm_runtime_suspend(dev, true);
+ break;
+ case RPM_REQ_RESUME:
+ __pm_runtime_resume(dev, true);
+ break;
+ }
+
+ out:
+ spin_unlock_irq(&dev->power.lock);
+}
+
+/**
+ * __pm_request_idle - Submit an idle notification request for given device.
+ * @dev: Device to handle.
+ *
+ * Check if the device's run-time PM status is correct for suspending the device
+ * and queue up a request to run __pm_runtime_idle() for it.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+static int __pm_request_idle(struct device *dev)
+{
+ int retval = 0;
+
+ if (dev->power.runtime_error)
+ retval = -EINVAL;
+ else if (atomic_read(&dev->power.usage_count) > 0
+ || dev->power.disable_depth > 0
+ || dev->power.runtime_status == RPM_SUSPENDED
+ || dev->power.runtime_status == RPM_SUSPENDING)
+ retval = -EAGAIN;
+ else if (!pm_children_suspended(dev))
+ retval = -EBUSY;
+ if (retval)
+ return retval;
+
+ if (dev->power.request_pending) {
+ /* Any requests other then RPM_REQ_IDLE take precedence. */
+ if (dev->power.request == RPM_REQ_NONE)
+ dev->power.request = RPM_REQ_IDLE;
+ else if (dev->power.request != RPM_REQ_IDLE)
+ retval = -EAGAIN;
+ return retval;
+ }
+
+ dev->power.request = RPM_REQ_IDLE;
+ dev->power.request_pending = true;
+ queue_work(pm_wq, &dev->power.work);
+
+ return retval;
+}
+
+/**
+ * pm_request_idle - Submit an idle notification request for given device.
+ * @dev: Device to handle.
+ */
+int pm_request_idle(struct device *dev)
+{
+ unsigned long flags;
+ int retval;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+ retval = __pm_request_idle(dev);
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_request_idle);
+
+/**
+ * __pm_request_suspend - Submit a suspend request for given device.
+ * @dev: Device to suspend.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+static int __pm_request_suspend(struct device *dev)
+{
+ int retval = 0;
+
+ if (dev->power.runtime_error)
+ return -EINVAL;
+
+ if (dev->power.runtime_status == RPM_SUSPENDED)
+ retval = 1;
+ else if (atomic_read(&dev->power.usage_count) > 0
+ || dev->power.disable_depth > 0)
+ retval = -EAGAIN;
+ else if (dev->power.runtime_status == RPM_SUSPENDING)
+ retval = -EINPROGRESS;
+ else if (!pm_children_suspended(dev))
+ retval = -EBUSY;
+ if (retval < 0)
+ return retval;
+
+ pm_runtime_deactivate_timer(dev);
+
+ if (dev->power.request_pending) {
+ /*
+ * Pending resume requests take precedence over us, but we can
+ * overtake any other pending request.
+ */
+ if (dev->power.request == RPM_REQ_RESUME)
+ retval = -EAGAIN;
+ else if (dev->power.request != RPM_REQ_SUSPEND)
+ dev->power.request = retval ?
+ RPM_REQ_NONE : RPM_REQ_SUSPEND;
+ return retval;
+ } else if (retval) {
+ return retval;
+ }
+
+ dev->power.request = RPM_REQ_SUSPEND;
+ dev->power.request_pending = true;
+ queue_work(pm_wq, &dev->power.work);
+
+ return 0;
+}
+
+/**
+ * pm_suspend_timer_fn - Timer function for pm_schedule_suspend().
+ * @data: Device pointer passed by pm_schedule_suspend().
+ *
+ * Check if the time is right and execute __pm_request_suspend() in that case.
+ */
+static void pm_suspend_timer_fn(unsigned long data)
+{
+ struct device *dev = (struct device *)data;
+ unsigned long flags;
+ unsigned long expires;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+
+ expires = dev->power.timer_expires;
+ /* If 'expire' is after 'jiffies' we've been called too early. */
+ if (expires > 0 && !time_after(expires, jiffies)) {
+ dev->power.timer_expires = 0;
+ __pm_request_suspend(dev);
+ }
+
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+}
+
+/**
+ * pm_schedule_suspend - Set up a timer to submit a suspend request in future.
+ * @dev: Device to suspend.
+ * @delay: Time to wait before submitting a suspend request, in milliseconds.
+ */
+int pm_schedule_suspend(struct device *dev, unsigned int delay)
+{
+ unsigned long flags;
+ int retval = 0;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+
+ if (dev->power.runtime_error) {
+ retval = -EINVAL;
+ goto out;
+ }
+
+ if (!delay) {
+ retval = __pm_request_suspend(dev);
+ goto out;
+ }
+
+ pm_runtime_deactivate_timer(dev);
+
+ if (dev->power.request_pending) {
+ /*
+ * Pending resume requests take precedence over us, but any
+ * other pending requests have to be canceled.
+ */
+ if (dev->power.request == RPM_REQ_RESUME) {
+ retval = -EAGAIN;
+ goto out;
+ }
+ dev->power.request = RPM_REQ_NONE;
+ }
+
+ if (dev->power.runtime_status == RPM_SUSPENDED)
+ retval = 1;
+ else if (dev->power.runtime_status == RPM_SUSPENDING)
+ retval = -EINPROGRESS;
+ else if (atomic_read(&dev->power.usage_count) > 0
+ || dev->power.disable_depth > 0)
+ retval = -EAGAIN;
+ else if (!pm_children_suspended(dev))
+ retval = -EBUSY;
+ if (retval)
+ goto out;
+
+ dev->power.timer_expires = jiffies + msecs_to_jiffies(delay);
+ mod_timer(&dev->power.suspend_timer, dev->power.timer_expires);
+
+ out:
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_schedule_suspend);
+
+/**
+ * pm_request_resume - Submit a resume request for given device.
+ * @dev: Device to resume.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+static int __pm_request_resume(struct device *dev)
+{
+ int retval = 0;
+
+ if (dev->power.runtime_error)
+ return -EINVAL;
+
+ if (dev->power.runtime_status == RPM_ACTIVE)
+ retval = 1;
+ else if (dev->power.runtime_status == RPM_RESUMING)
+ retval = -EINPROGRESS;
+ else if (dev->power.disable_depth > 0)
+ retval = -EAGAIN;
+ if (retval < 0)
+ return retval;
+
+ pm_runtime_deactivate_timer(dev);
+
+ if (dev->power.request_pending) {
+ /* If non-resume request is pending, we can overtake it. */
+ dev->power.request = retval ? RPM_REQ_NONE : RPM_REQ_RESUME;
+ return retval;
+ } else if (retval) {
+ return retval;
+ }
+
+ dev->power.request = RPM_REQ_RESUME;
+ dev->power.request_pending = true;
+ queue_work(pm_wq, &dev->power.work);
+
+ return retval;
+}
+
+/**
+ * pm_request_resume - Submit a resume request for given device.
+ * @dev: Device to resume.
+ */
+int pm_request_resume(struct device *dev)
+{
+ unsigned long flags;
+ int retval;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+ retval = __pm_request_resume(dev);
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_request_resume);
+
+/**
+ * __pm_runtime_get - Reference count a device and wake it up, if necessary.
+ * @dev: Device to handle.
+ * @sync: If set and the device is suspended, resume it synchronously.
+ *
+ * Increment the usage count of the device and if it was zero previously,
+ * resume it or submit a resume request for it, depending on the value of @sync.
+ */
+int __pm_runtime_get(struct device *dev, bool sync)
+{
+ int retval = 1;
+
+ if (atomic_add_return(1, &dev->power.usage_count) == 1)
+ retval = sync ? pm_runtime_resume(dev) : pm_request_resume(dev);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(__pm_runtime_get);
+
+/**
+ * __pm_runtime_put - Decrement the device's usage counter and notify its bus.
+ * @dev: Device to handle.
+ * @sync: If the device's bus type is to be notified, do that synchronously.
+ *
+ * Decrement the usage count of the device and if it reaches zero, carry out a
+ * synchronous idle notification or submit an idle notification request for it,
+ * depending on the value of @sync.
+ */
+int __pm_runtime_put(struct device *dev, bool sync)
+{
+ int retval = 0;
+
+ if (atomic_dec_and_test(&dev->power.usage_count))
+ retval = sync ? pm_runtime_idle(dev) : pm_request_idle(dev);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(__pm_runtime_put);
+
+/**
+ * __pm_runtime_set_status - Set run-time PM status of a device.
+ * @dev: Device to handle.
+ * @status: New run-time PM status of the device.
+ *
+ * If run-time PM of the device is disabled or its power.runtime_error field is
+ * different from zero, the status may be changed either to RPM_ACTIVE, or to
+ * RPM_SUSPENDED, as long as that reflects the actual state of the device.
+ * However, if the device has a parent and the parent is not active, and the
+ * parent's power.ignore_children flag is unset, the device's status cannot be
+ * set to RPM_ACTIVE, so -EBUSY is returned in that case.
+ *
+ * If successful, __pm_runtime_set_status() clears the power.runtime_error field
+ * and the device parent's counter of unsuspended children is modified to
+ * reflect the new status. If the new status is RPM_SUSPENDED, an idle
+ * notification request for the parent is submitted.
+ */
+int __pm_runtime_set_status(struct device *dev, unsigned int status)
+{
+ struct device *parent = dev->parent;
+ unsigned long flags;
+ bool notify_parent = false;
+ int error = 0;
+
+ if (status != RPM_ACTIVE && status != RPM_SUSPENDED)
+ return -EINVAL;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+
+ if (!dev->power.runtime_error && !dev->power.disable_depth) {
+ error = -EAGAIN;
+ goto out;
+ }
+
+ if (dev->power.runtime_status == status)
+ goto out_set;
+
+ if (status == RPM_SUSPENDED) {
+ /* It always is possible to set the status to 'suspended'. */
+ if (parent) {
+ atomic_add_unless(&parent->power.child_count, -1, 0);
+ notify_parent = !parent->power.ignore_children;
+ }
+ goto out_set;
+ }
+
+ if (parent) {
+ spin_lock_irq(&parent->power.lock);
+
+ /*
+ * It is invalid to put an active child under a parent that is
+ * not active, has run-time PM enabled and the
+ * 'power.ignore_children' flag unset.
+ */
+ if (!parent->power.disable_depth
+ && !parent->power.ignore_children
+ && parent->power.runtime_status != RPM_ACTIVE) {
+ error = -EBUSY;
+ } else {
+ if (dev->power.runtime_status == RPM_SUSPENDED)
+ atomic_inc(&parent->power.child_count);
+ }
+
+ spin_unlock_irq(&parent->power.lock);
+
+ if (error)
+ goto out;
+ }
+
+ out_set:
+ dev->power.runtime_status = status;
+ dev->power.runtime_error = 0;
+ out:
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+
+ if (notify_parent)
+ pm_request_idle(parent);
+
+ return error;
+}
+EXPORT_SYMBOL_GPL(__pm_runtime_set_status);
+
+/**
+ * __pm_runtime_barrier - Cancel pending requests and wait for completions.
+ * @dev: Device to handle.
+ *
+ * Flush all pending requests for the device from pm_wq and wait for all
+ * run-time PM operations involving the device in progress to complete.
+ *
+ * Should be called under dev->power.lock with interrupts disabled.
+ */
+static void __pm_runtime_barrier(struct device *dev)
+{
+ pm_runtime_deactivate_timer(dev);
+
+ if (dev->power.request_pending) {
+ dev->power.request = RPM_REQ_NONE;
+ spin_unlock_irq(&dev->power.lock);
+
+ cancel_work_sync(&dev->power.work);
+
+ spin_lock_irq(&dev->power.lock);
+ dev->power.request_pending = false;
+ }
+
+ if (dev->power.runtime_status == RPM_SUSPENDING
+ || dev->power.runtime_status == RPM_RESUMING
+ || dev->power.idle_notification) {
+ DEFINE_WAIT(wait);
+
+ /* Suspend, wake-up or idle notification in progress. */
+ for (;;) {
+ prepare_to_wait(&dev->power.wait_queue, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (dev->power.runtime_status != RPM_SUSPENDING
+ && dev->power.runtime_status != RPM_RESUMING
+ && !dev->power.idle_notification)
+ break;
+ spin_unlock_irq(&dev->power.lock);
+
+ schedule();
+
+ spin_lock_irq(&dev->power.lock);
+ }
+ finish_wait(&dev->power.wait_queue, &wait);
+ }
+}
+
+/**
+ * pm_runtime_barrier - Flush pending requests and wait for completions.
+ * @dev: Device to handle.
+ *
+ * Prevent the device from being suspended by incrementing its usage counter and
+ * if there's a pending resume request for the device, wake the device up.
+ * Next, make sure that all pending requests for the device have been flushed
+ * from pm_wq and wait for all run-time PM operations involving the device in
+ * progress to complete.
+ *
+ * Return value:
+ * 1, if there was a resume request pending and the device had to be woken up,
+ * 0, otherwise
+ */
+int pm_runtime_barrier(struct device *dev)
+{
+ int retval = 0;
+
+ pm_runtime_get_noresume(dev);
+ spin_lock_irq(&dev->power.lock);
+
+ if (dev->power.request_pending
+ && dev->power.request == RPM_REQ_RESUME) {
+ __pm_runtime_resume(dev, false);
+ retval = 1;
+ }
+
+ __pm_runtime_barrier(dev);
+
+ spin_unlock_irq(&dev->power.lock);
+ pm_runtime_put_noidle(dev);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_runtime_barrier);
+
+/**
+ * __pm_runtime_disable - Disable run-time PM of a device.
+ * @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,
+ * cancel all pending run-time PM requests for the device and wait for all
+ * operations in progress to complete. The device can be either active or
+ * suspended after its run-time PM has been disabled.
+ *
+ * If @check_resume is set and there's a resume request pending when
+ * __pm_runtime_disable() is called and power.disable_depth is zero, the
+ * function will wake up the device before disabling its run-time PM.
+ */
+void __pm_runtime_disable(struct device *dev, bool check_resume)
+{
+ spin_lock_irq(&dev->power.lock);
+
+ if (dev->power.disable_depth > 0) {
+ dev->power.disable_depth++;
+ goto out;
+ }
+
+ /*
+ * Wake up the device if there's a resume request pending, because that
+ * means there probably is some I/O to process and disabling run-time PM
+ * shouldn't prevent the device from processing the I/O.
+ */
+ if (check_resume && dev->power.request_pending
+ && dev->power.request == RPM_REQ_RESUME) {
+ /*
+ * Prevent suspends and idle notifications from being carried
+ * out after we have woken up the device.
+ */
+ pm_runtime_get_noresume(dev);
+
+ __pm_runtime_resume(dev, false);
+
+ pm_runtime_put_noidle(dev);
+ }
+
+ if (!dev->power.disable_depth++)
+ __pm_runtime_barrier(dev);
+
+ out:
+ spin_unlock_irq(&dev->power.lock);
+}
+EXPORT_SYMBOL_GPL(__pm_runtime_disable);
+
+/**
+ * pm_runtime_enable - Enable run-time PM of a device.
+ * @dev: Device to handle.
+ */
+void pm_runtime_enable(struct device *dev)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+
+ if (dev->power.disable_depth > 0)
+ dev->power.disable_depth--;
+ else
+ dev_warn(dev, "Unbalanced %s!\n", __func__);
+
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_enable);
+
+/**
+ * pm_runtime_init - Initialize run-time PM fields in given device object.
+ * @dev: Device object to initialize.
+ */
+void pm_runtime_init(struct device *dev)
+{
+ spin_lock_init(&dev->power.lock);
+
+ dev->power.runtime_status = RPM_SUSPENDED;
+ dev->power.idle_notification = false;
+
+ dev->power.disable_depth = 1;
+ atomic_set(&dev->power.usage_count, 0);
+
+ dev->power.runtime_error = 0;
+
+ atomic_set(&dev->power.child_count, 0);
+ pm_suspend_ignore_children(dev, false);
+
+ dev->power.request_pending = false;
+ dev->power.request = RPM_REQ_NONE;
+ dev->power.deferred_resume = false;
+ INIT_WORK(&dev->power.work, pm_runtime_work);
+
+ dev->power.timer_expires = 0;
+ setup_timer(&dev->power.suspend_timer, pm_suspend_timer_fn,
+ (unsigned long)dev);
+
+ init_waitqueue_head(&dev->power.wait_queue);
+}
+
+/**
+ * pm_runtime_remove - Prepare for removing a device from device hierarchy.
+ * @dev: Device object being removed from device hierarchy.
+ */
+void pm_runtime_remove(struct device *dev)
+{
+ __pm_runtime_disable(dev, false);
+
+ /* Change the status back to 'suspended' to match the initial status. */
+ if (dev->power.runtime_status == RPM_ACTIVE)
+ pm_runtime_set_suspended(dev);
+}