#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>
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)
{
}
/**
- * 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)
{
}
/**
- * 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)
{
}
/**
- * 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)
{
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)
{
}
/**
- * 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)
{
}
/**
- * 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)
{
}
/**
- * 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;
}
/**
- * 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;
/*------------------------- 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)
{
}
/**
- * 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;
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)
{
}
/**
- * 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)
{
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);
}
/**
- * 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)
{
}
/**
- * 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)
{
mutex_unlock(&dpm_list_mtx);
device_complete(dev, state);
+ pm_runtime_put_noidle(dev);
mutex_lock(&dpm_list_mtx);
}
}
/**
- * 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)
{
/*------------------------- 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)
{
}
/**
- * 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)
{
}
/**
- * 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)
{
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)
{
}
/**
- * 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)
{
}
/**
- * 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)
{
}
/**
- * 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)
{
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) {
}
/**
- * 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)
{
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