1092 lines
26 KiB
C
1092 lines
26 KiB
C
/*
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* drivers/base/power/main.c - Where the driver meets power management.
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*
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* Copyright (c) 2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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*
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* This file is released under the GPLv2
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*
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*
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* The driver model core calls device_pm_add() when a device is registered.
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* This will intialize the embedded device_pm_info object in the device
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* and add it to the list of power-controlled devices. sysfs entries for
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* controlling device power management will also be added.
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*
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* A separate list is used for keeping track of power info, because the power
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* domain dependencies may differ from the ancestral dependencies that the
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* subsystem list maintains.
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*/
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#include <linux/device.h>
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#include <linux/kallsyms.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <linux/resume-trace.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/async.h>
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#include "../base.h"
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#include "power.h"
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/*
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* The entries in the dpm_list list are in a depth first order, simply
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* because children are guaranteed to be discovered after parents, and
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* are inserted at the back of the list on discovery.
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*
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* Since device_pm_add() may be called with a device lock held,
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* we must never try to acquire a device lock while holding
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* dpm_list_mutex.
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*/
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LIST_HEAD(dpm_list);
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static DEFINE_MUTEX(dpm_list_mtx);
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static pm_message_t pm_transition;
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/*
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* Set once the preparation of devices for a PM transition has started, reset
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* before starting to resume devices. Protected by dpm_list_mtx.
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*/
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static bool transition_started;
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/**
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* device_pm_init - Initialize the PM-related part of a device object.
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* @dev: Device object being initialized.
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*/
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void device_pm_init(struct device *dev)
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{
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dev->power.status = DPM_ON;
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init_completion(&dev->power.completion);
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dev->power.wakeup_count = 0;
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pm_runtime_init(dev);
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}
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/**
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* device_pm_lock - Lock the list of active devices used by the PM core.
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*/
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void device_pm_lock(void)
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{
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mutex_lock(&dpm_list_mtx);
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}
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/**
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* device_pm_unlock - Unlock the list of active devices used by the PM core.
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*/
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void device_pm_unlock(void)
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{
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mutex_unlock(&dpm_list_mtx);
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}
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/**
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* device_pm_add - Add a device to the PM core's list of active devices.
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* @dev: Device to add to the list.
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*/
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void device_pm_add(struct device *dev)
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{
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pr_debug("PM: Adding info for %s:%s\n",
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dev->bus ? dev->bus->name : "No Bus",
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kobject_name(&dev->kobj));
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mutex_lock(&dpm_list_mtx);
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if (dev->parent) {
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if (dev->parent->power.status >= DPM_SUSPENDING)
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dev_warn(dev, "parent %s should not be sleeping\n",
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dev_name(dev->parent));
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} else if (transition_started) {
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/*
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* We refuse to register parentless devices while a PM
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* transition is in progress in order to avoid leaving them
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* unhandled down the road
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*/
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dev_WARN(dev, "Parentless device registered during a PM transaction\n");
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}
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list_add_tail(&dev->power.entry, &dpm_list);
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mutex_unlock(&dpm_list_mtx);
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}
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/**
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* device_pm_remove - Remove a device from the PM core's list of active devices.
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* @dev: Device to be removed from the list.
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*/
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void device_pm_remove(struct device *dev)
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{
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pr_debug("PM: Removing info for %s:%s\n",
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dev->bus ? dev->bus->name : "No Bus",
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kobject_name(&dev->kobj));
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complete_all(&dev->power.completion);
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mutex_lock(&dpm_list_mtx);
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list_del_init(&dev->power.entry);
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mutex_unlock(&dpm_list_mtx);
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pm_runtime_remove(dev);
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}
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/**
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* device_pm_move_before - Move device in the PM core's list of active devices.
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* @deva: Device to move in dpm_list.
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* @devb: Device @deva should come before.
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*/
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void device_pm_move_before(struct device *deva, struct device *devb)
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{
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pr_debug("PM: Moving %s:%s before %s:%s\n",
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deva->bus ? deva->bus->name : "No Bus",
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kobject_name(&deva->kobj),
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devb->bus ? devb->bus->name : "No Bus",
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kobject_name(&devb->kobj));
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/* Delete deva from dpm_list and reinsert before devb. */
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list_move_tail(&deva->power.entry, &devb->power.entry);
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}
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/**
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* device_pm_move_after - Move device in the PM core's list of active devices.
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* @deva: Device to move in dpm_list.
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* @devb: Device @deva should come after.
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*/
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void device_pm_move_after(struct device *deva, struct device *devb)
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{
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pr_debug("PM: Moving %s:%s after %s:%s\n",
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deva->bus ? deva->bus->name : "No Bus",
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kobject_name(&deva->kobj),
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devb->bus ? devb->bus->name : "No Bus",
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kobject_name(&devb->kobj));
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/* Delete deva from dpm_list and reinsert after devb. */
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list_move(&deva->power.entry, &devb->power.entry);
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}
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/**
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* device_pm_move_last - Move device to end of the PM core's list of devices.
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* @dev: Device to move in dpm_list.
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*/
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void device_pm_move_last(struct device *dev)
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{
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pr_debug("PM: Moving %s:%s to end of list\n",
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dev->bus ? dev->bus->name : "No Bus",
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kobject_name(&dev->kobj));
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list_move_tail(&dev->power.entry, &dpm_list);
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}
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static ktime_t initcall_debug_start(struct device *dev)
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{
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ktime_t calltime = ktime_set(0, 0);
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if (initcall_debug) {
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pr_info("calling %s+ @ %i\n",
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dev_name(dev), task_pid_nr(current));
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calltime = ktime_get();
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}
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return calltime;
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}
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static void initcall_debug_report(struct device *dev, ktime_t calltime,
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int error)
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{
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ktime_t delta, rettime;
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if (initcall_debug) {
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rettime = ktime_get();
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delta = ktime_sub(rettime, calltime);
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pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),
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error, (unsigned long long)ktime_to_ns(delta) >> 10);
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}
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}
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/**
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* dpm_wait - Wait for a PM operation to complete.
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* @dev: Device to wait for.
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* @async: If unset, wait only if the device's power.async_suspend flag is set.
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*/
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static void dpm_wait(struct device *dev, bool async)
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{
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if (!dev)
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return;
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if (async || (pm_async_enabled && dev->power.async_suspend))
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wait_for_completion(&dev->power.completion);
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}
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static int dpm_wait_fn(struct device *dev, void *async_ptr)
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{
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dpm_wait(dev, *((bool *)async_ptr));
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return 0;
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}
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static void dpm_wait_for_children(struct device *dev, bool async)
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{
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device_for_each_child(dev, &async, dpm_wait_fn);
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}
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/**
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* pm_op - Execute the PM operation appropriate for given PM event.
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* @dev: Device to handle.
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* @ops: PM operations to choose from.
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* @state: PM transition of the system being carried out.
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*/
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static int pm_op(struct device *dev,
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const struct dev_pm_ops *ops,
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pm_message_t state)
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{
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int error = 0;
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ktime_t calltime;
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calltime = initcall_debug_start(dev);
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switch (state.event) {
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#ifdef CONFIG_SUSPEND
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case PM_EVENT_SUSPEND:
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if (ops->suspend) {
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error = ops->suspend(dev);
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suspend_report_result(ops->suspend, error);
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}
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break;
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case PM_EVENT_RESUME:
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if (ops->resume) {
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error = ops->resume(dev);
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suspend_report_result(ops->resume, error);
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}
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break;
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#endif /* CONFIG_SUSPEND */
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#ifdef CONFIG_HIBERNATION
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case PM_EVENT_FREEZE:
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case PM_EVENT_QUIESCE:
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if (ops->freeze) {
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error = ops->freeze(dev);
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suspend_report_result(ops->freeze, error);
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}
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break;
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case PM_EVENT_HIBERNATE:
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if (ops->poweroff) {
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error = ops->poweroff(dev);
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suspend_report_result(ops->poweroff, error);
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}
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break;
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case PM_EVENT_THAW:
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case PM_EVENT_RECOVER:
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if (ops->thaw) {
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error = ops->thaw(dev);
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suspend_report_result(ops->thaw, error);
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}
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break;
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case PM_EVENT_RESTORE:
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if (ops->restore) {
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error = ops->restore(dev);
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suspend_report_result(ops->restore, error);
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}
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break;
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#endif /* CONFIG_HIBERNATION */
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default:
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error = -EINVAL;
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}
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initcall_debug_report(dev, calltime, error);
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return error;
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}
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/**
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* pm_noirq_op - Execute the PM operation appropriate for given PM event.
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* @dev: Device to handle.
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* @ops: PM operations to choose from.
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* @state: PM transition of the system being carried out.
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*
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* The driver of @dev will not receive interrupts while this function is being
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* executed.
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*/
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static int pm_noirq_op(struct device *dev,
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const struct dev_pm_ops *ops,
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pm_message_t state)
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{
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int error = 0;
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ktime_t calltime, delta, rettime;
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if (initcall_debug) {
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pr_info("calling %s+ @ %i, parent: %s\n",
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dev_name(dev), task_pid_nr(current),
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dev->parent ? dev_name(dev->parent) : "none");
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calltime = ktime_get();
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}
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switch (state.event) {
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#ifdef CONFIG_SUSPEND
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case PM_EVENT_SUSPEND:
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if (ops->suspend_noirq) {
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error = ops->suspend_noirq(dev);
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suspend_report_result(ops->suspend_noirq, error);
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}
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break;
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case PM_EVENT_RESUME:
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if (ops->resume_noirq) {
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error = ops->resume_noirq(dev);
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suspend_report_result(ops->resume_noirq, error);
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}
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break;
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#endif /* CONFIG_SUSPEND */
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#ifdef CONFIG_HIBERNATION
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case PM_EVENT_FREEZE:
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case PM_EVENT_QUIESCE:
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if (ops->freeze_noirq) {
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error = ops->freeze_noirq(dev);
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suspend_report_result(ops->freeze_noirq, error);
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}
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break;
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case PM_EVENT_HIBERNATE:
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if (ops->poweroff_noirq) {
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error = ops->poweroff_noirq(dev);
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suspend_report_result(ops->poweroff_noirq, error);
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}
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break;
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case PM_EVENT_THAW:
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case PM_EVENT_RECOVER:
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if (ops->thaw_noirq) {
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error = ops->thaw_noirq(dev);
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suspend_report_result(ops->thaw_noirq, error);
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}
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break;
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case PM_EVENT_RESTORE:
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if (ops->restore_noirq) {
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error = ops->restore_noirq(dev);
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suspend_report_result(ops->restore_noirq, error);
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}
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break;
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#endif /* CONFIG_HIBERNATION */
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default:
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error = -EINVAL;
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}
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if (initcall_debug) {
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rettime = ktime_get();
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delta = ktime_sub(rettime, calltime);
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printk("initcall %s_i+ returned %d after %Ld usecs\n",
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dev_name(dev), error,
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(unsigned long long)ktime_to_ns(delta) >> 10);
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}
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return error;
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}
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static char *pm_verb(int event)
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{
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switch (event) {
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case PM_EVENT_SUSPEND:
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return "suspend";
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case PM_EVENT_RESUME:
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return "resume";
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case PM_EVENT_FREEZE:
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return "freeze";
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case PM_EVENT_QUIESCE:
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return "quiesce";
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case PM_EVENT_HIBERNATE:
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return "hibernate";
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case PM_EVENT_THAW:
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return "thaw";
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case PM_EVENT_RESTORE:
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return "restore";
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case PM_EVENT_RECOVER:
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return "recover";
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default:
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return "(unknown PM event)";
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}
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}
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static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info)
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{
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dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event),
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((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ?
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", may wakeup" : "");
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}
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static void pm_dev_err(struct device *dev, pm_message_t state, char *info,
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int error)
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{
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printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n",
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kobject_name(&dev->kobj), pm_verb(state.event), info, error);
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}
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static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info)
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{
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ktime_t calltime;
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s64 usecs64;
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int usecs;
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calltime = ktime_get();
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usecs64 = ktime_to_ns(ktime_sub(calltime, starttime));
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do_div(usecs64, NSEC_PER_USEC);
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usecs = usecs64;
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if (usecs == 0)
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usecs = 1;
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pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n",
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info ?: "", info ? " " : "", pm_verb(state.event),
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usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
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}
|
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|
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/*------------------------- Resume routines -------------------------*/
|
|
|
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/**
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* device_resume_noirq - Execute an "early resume" callback for given device.
|
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* @dev: Device to handle.
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* @state: PM transition of the system being carried out.
|
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*
|
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* The driver of @dev will not receive interrupts while this function is being
|
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* executed.
|
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*/
|
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static int device_resume_noirq(struct device *dev, pm_message_t state)
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{
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int error = 0;
|
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TRACE_DEVICE(dev);
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TRACE_RESUME(0);
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if (dev->bus && dev->bus->pm) {
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pm_dev_dbg(dev, state, "EARLY ");
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error = pm_noirq_op(dev, dev->bus->pm, state);
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if (error)
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goto End;
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}
|
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|
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if (dev->type && dev->type->pm) {
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pm_dev_dbg(dev, state, "EARLY type ");
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error = pm_noirq_op(dev, dev->type->pm, state);
|
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if (error)
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goto End;
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}
|
|
|
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if (dev->class && dev->class->pm) {
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pm_dev_dbg(dev, state, "EARLY class ");
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error = pm_noirq_op(dev, dev->class->pm, state);
|
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}
|
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|
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End:
|
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TRACE_RESUME(error);
|
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return error;
|
|
}
|
|
|
|
/**
|
|
* dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices.
|
|
* @state: PM transition of the system being carried out.
|
|
*
|
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* Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and
|
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* enable device drivers to receive interrupts.
|
|
*/
|
|
void dpm_resume_noirq(pm_message_t state)
|
|
{
|
|
struct device *dev;
|
|
ktime_t starttime = ktime_get();
|
|
|
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mutex_lock(&dpm_list_mtx);
|
|
transition_started = false;
|
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list_for_each_entry(dev, &dpm_list, power.entry)
|
|
if (dev->power.status > DPM_OFF) {
|
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int error;
|
|
|
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dev->power.status = DPM_OFF;
|
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error = device_resume_noirq(dev, state);
|
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if (error)
|
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pm_dev_err(dev, state, " early", error);
|
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}
|
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mutex_unlock(&dpm_list_mtx);
|
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dpm_show_time(starttime, state, "early");
|
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resume_device_irqs();
|
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}
|
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EXPORT_SYMBOL_GPL(dpm_resume_noirq);
|
|
|
|
/**
|
|
* legacy_resume - Execute a legacy (bus or class) resume callback for device.
|
|
* @dev: Device to resume.
|
|
* @cb: Resume callback to execute.
|
|
*/
|
|
static int legacy_resume(struct device *dev, int (*cb)(struct device *dev))
|
|
{
|
|
int error;
|
|
ktime_t calltime;
|
|
|
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calltime = initcall_debug_start(dev);
|
|
|
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error = cb(dev);
|
|
suspend_report_result(cb, error);
|
|
|
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initcall_debug_report(dev, calltime, error);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* device_resume - Execute "resume" callbacks for given device.
|
|
* @dev: Device to handle.
|
|
* @state: PM transition of the system being carried out.
|
|
* @async: If true, the device is being resumed asynchronously.
|
|
*/
|
|
static int device_resume(struct device *dev, pm_message_t state, bool async)
|
|
{
|
|
int error = 0;
|
|
|
|
TRACE_DEVICE(dev);
|
|
TRACE_RESUME(0);
|
|
|
|
dpm_wait(dev->parent, async);
|
|
device_lock(dev);
|
|
|
|
dev->power.status = DPM_RESUMING;
|
|
|
|
if (dev->bus) {
|
|
if (dev->bus->pm) {
|
|
pm_dev_dbg(dev, state, "");
|
|
error = pm_op(dev, dev->bus->pm, state);
|
|
} else if (dev->bus->resume) {
|
|
pm_dev_dbg(dev, state, "legacy ");
|
|
error = legacy_resume(dev, dev->bus->resume);
|
|
}
|
|
if (error)
|
|
goto End;
|
|
}
|
|
|
|
if (dev->type) {
|
|
if (dev->type->pm) {
|
|
pm_dev_dbg(dev, state, "type ");
|
|
error = pm_op(dev, dev->type->pm, state);
|
|
}
|
|
if (error)
|
|
goto End;
|
|
}
|
|
|
|
if (dev->class) {
|
|
if (dev->class->pm) {
|
|
pm_dev_dbg(dev, state, "class ");
|
|
error = pm_op(dev, dev->class->pm, state);
|
|
} else if (dev->class->resume) {
|
|
pm_dev_dbg(dev, state, "legacy class ");
|
|
error = legacy_resume(dev, dev->class->resume);
|
|
}
|
|
}
|
|
End:
|
|
device_unlock(dev);
|
|
complete_all(&dev->power.completion);
|
|
|
|
TRACE_RESUME(error);
|
|
return error;
|
|
}
|
|
|
|
static void async_resume(void *data, async_cookie_t cookie)
|
|
{
|
|
struct device *dev = (struct device *)data;
|
|
int error;
|
|
|
|
error = device_resume(dev, pm_transition, true);
|
|
if (error)
|
|
pm_dev_err(dev, pm_transition, " async", error);
|
|
put_device(dev);
|
|
}
|
|
|
|
static bool is_async(struct device *dev)
|
|
{
|
|
return dev->power.async_suspend && pm_async_enabled
|
|
&& !pm_trace_is_enabled();
|
|
}
|
|
|
|
/**
|
|
* dpm_resume - Execute "resume" callbacks for non-sysdev devices.
|
|
* @state: PM transition of the system being carried out.
|
|
*
|
|
* Execute the appropriate "resume" callback for all devices whose status
|
|
* indicates that they are suspended.
|
|
*/
|
|
static void dpm_resume(pm_message_t state)
|
|
{
|
|
struct list_head list;
|
|
struct device *dev;
|
|
ktime_t starttime = ktime_get();
|
|
|
|
INIT_LIST_HEAD(&list);
|
|
mutex_lock(&dpm_list_mtx);
|
|
pm_transition = state;
|
|
|
|
list_for_each_entry(dev, &dpm_list, power.entry) {
|
|
if (dev->power.status < DPM_OFF)
|
|
continue;
|
|
|
|
INIT_COMPLETION(dev->power.completion);
|
|
if (is_async(dev)) {
|
|
get_device(dev);
|
|
async_schedule(async_resume, dev);
|
|
}
|
|
}
|
|
|
|
while (!list_empty(&dpm_list)) {
|
|
dev = to_device(dpm_list.next);
|
|
get_device(dev);
|
|
if (dev->power.status >= DPM_OFF && !is_async(dev)) {
|
|
int error;
|
|
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
error = device_resume(dev, state, false);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
if (error)
|
|
pm_dev_err(dev, state, "", error);
|
|
} else if (dev->power.status == DPM_SUSPENDING) {
|
|
/* Allow new children of the device to be registered */
|
|
dev->power.status = DPM_RESUMING;
|
|
}
|
|
if (!list_empty(&dev->power.entry))
|
|
list_move_tail(&dev->power.entry, &list);
|
|
put_device(dev);
|
|
}
|
|
list_splice(&list, &dpm_list);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
async_synchronize_full();
|
|
dpm_show_time(starttime, state, NULL);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
device_lock(dev);
|
|
|
|
if (dev->class && dev->class->pm && dev->class->pm->complete) {
|
|
pm_dev_dbg(dev, state, "completing class ");
|
|
dev->class->pm->complete(dev);
|
|
}
|
|
|
|
if (dev->type && dev->type->pm && dev->type->pm->complete) {
|
|
pm_dev_dbg(dev, state, "completing type ");
|
|
dev->type->pm->complete(dev);
|
|
}
|
|
|
|
if (dev->bus && dev->bus->pm && dev->bus->pm->complete) {
|
|
pm_dev_dbg(dev, state, "completing ");
|
|
dev->bus->pm->complete(dev);
|
|
}
|
|
|
|
device_unlock(dev);
|
|
}
|
|
|
|
/**
|
|
* 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 whose PM status is not
|
|
* DPM_ON (this allows new devices to be registered).
|
|
*/
|
|
static void dpm_complete(pm_message_t state)
|
|
{
|
|
struct list_head list;
|
|
|
|
INIT_LIST_HEAD(&list);
|
|
mutex_lock(&dpm_list_mtx);
|
|
transition_started = false;
|
|
while (!list_empty(&dpm_list)) {
|
|
struct device *dev = to_device(dpm_list.prev);
|
|
|
|
get_device(dev);
|
|
if (dev->power.status > DPM_ON) {
|
|
dev->power.status = DPM_ON;
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
device_complete(dev, state);
|
|
pm_runtime_put_sync(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
}
|
|
if (!list_empty(&dev->power.entry))
|
|
list_move(&dev->power.entry, &list);
|
|
put_device(dev);
|
|
}
|
|
list_splice(&list, &dpm_list);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
}
|
|
|
|
/**
|
|
* dpm_resume_end - Execute "resume" callbacks and complete system transition.
|
|
* @state: PM transition of the system being carried out.
|
|
*
|
|
* Execute "resume" callbacks for all devices and complete the PM transition of
|
|
* the system.
|
|
*/
|
|
void dpm_resume_end(pm_message_t state)
|
|
{
|
|
might_sleep();
|
|
dpm_resume(state);
|
|
dpm_complete(state);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dpm_resume_end);
|
|
|
|
|
|
/*------------------------- Suspend routines -------------------------*/
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
switch (sleep_state.event) {
|
|
case PM_EVENT_SUSPEND:
|
|
return PMSG_RESUME;
|
|
case PM_EVENT_FREEZE:
|
|
case PM_EVENT_QUIESCE:
|
|
return PMSG_RECOVER;
|
|
case PM_EVENT_HIBERNATE:
|
|
return PMSG_RESTORE;
|
|
}
|
|
return PMSG_ON;
|
|
}
|
|
|
|
/**
|
|
* device_suspend_noirq - Execute a "late suspend" callback for given device.
|
|
* @dev: Device to handle.
|
|
* @state: PM transition of the system being carried out.
|
|
*
|
|
* 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)
|
|
{
|
|
int error = 0;
|
|
|
|
if (dev->class && dev->class->pm) {
|
|
pm_dev_dbg(dev, state, "LATE class ");
|
|
error = pm_noirq_op(dev, dev->class->pm, state);
|
|
if (error)
|
|
goto End;
|
|
}
|
|
|
|
if (dev->type && dev->type->pm) {
|
|
pm_dev_dbg(dev, state, "LATE type ");
|
|
error = pm_noirq_op(dev, dev->type->pm, state);
|
|
if (error)
|
|
goto End;
|
|
}
|
|
|
|
if (dev->bus && dev->bus->pm) {
|
|
pm_dev_dbg(dev, state, "LATE ");
|
|
error = pm_noirq_op(dev, dev->bus->pm, state);
|
|
}
|
|
|
|
End:
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev 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)
|
|
{
|
|
struct device *dev;
|
|
ktime_t starttime = ktime_get();
|
|
int error = 0;
|
|
|
|
suspend_device_irqs();
|
|
mutex_lock(&dpm_list_mtx);
|
|
list_for_each_entry_reverse(dev, &dpm_list, power.entry) {
|
|
error = device_suspend_noirq(dev, state);
|
|
if (error) {
|
|
pm_dev_err(dev, state, " late", error);
|
|
break;
|
|
}
|
|
dev->power.status = DPM_OFF_IRQ;
|
|
}
|
|
mutex_unlock(&dpm_list_mtx);
|
|
if (error)
|
|
dpm_resume_noirq(resume_event(state));
|
|
else
|
|
dpm_show_time(starttime, state, "late");
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dpm_suspend_noirq);
|
|
|
|
/**
|
|
* legacy_suspend - Execute a legacy (bus or class) suspend callback for device.
|
|
* @dev: Device to suspend.
|
|
* @state: PM transition of the system being carried out.
|
|
* @cb: Suspend callback to execute.
|
|
*/
|
|
static int legacy_suspend(struct device *dev, pm_message_t state,
|
|
int (*cb)(struct device *dev, pm_message_t state))
|
|
{
|
|
int error;
|
|
ktime_t calltime;
|
|
|
|
calltime = initcall_debug_start(dev);
|
|
|
|
error = cb(dev, state);
|
|
suspend_report_result(cb, error);
|
|
|
|
initcall_debug_report(dev, calltime, error);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int async_error;
|
|
|
|
/**
|
|
* device_suspend - Execute "suspend" callbacks for given device.
|
|
* @dev: Device to handle.
|
|
* @state: PM transition of the system being carried out.
|
|
* @async: If true, the device is being suspended asynchronously.
|
|
*/
|
|
static int __device_suspend(struct device *dev, pm_message_t state, bool async)
|
|
{
|
|
int error = 0;
|
|
|
|
dpm_wait_for_children(dev, async);
|
|
device_lock(dev);
|
|
|
|
if (async_error)
|
|
goto End;
|
|
|
|
if (dev->class) {
|
|
if (dev->class->pm) {
|
|
pm_dev_dbg(dev, state, "class ");
|
|
error = pm_op(dev, dev->class->pm, state);
|
|
} else if (dev->class->suspend) {
|
|
pm_dev_dbg(dev, state, "legacy class ");
|
|
error = legacy_suspend(dev, state, dev->class->suspend);
|
|
}
|
|
if (error)
|
|
goto End;
|
|
}
|
|
|
|
if (dev->type) {
|
|
if (dev->type->pm) {
|
|
pm_dev_dbg(dev, state, "type ");
|
|
error = pm_op(dev, dev->type->pm, state);
|
|
}
|
|
if (error)
|
|
goto End;
|
|
}
|
|
|
|
if (dev->bus) {
|
|
if (dev->bus->pm) {
|
|
pm_dev_dbg(dev, state, "");
|
|
error = pm_op(dev, dev->bus->pm, state);
|
|
} else if (dev->bus->suspend) {
|
|
pm_dev_dbg(dev, state, "legacy ");
|
|
error = legacy_suspend(dev, state, dev->bus->suspend);
|
|
}
|
|
}
|
|
|
|
if (!error)
|
|
dev->power.status = DPM_OFF;
|
|
|
|
End:
|
|
device_unlock(dev);
|
|
complete_all(&dev->power.completion);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void async_suspend(void *data, async_cookie_t cookie)
|
|
{
|
|
struct device *dev = (struct device *)data;
|
|
int error;
|
|
|
|
error = __device_suspend(dev, pm_transition, true);
|
|
if (error) {
|
|
pm_dev_err(dev, pm_transition, " async", error);
|
|
async_error = error;
|
|
}
|
|
|
|
put_device(dev);
|
|
}
|
|
|
|
static int device_suspend(struct device *dev)
|
|
{
|
|
INIT_COMPLETION(dev->power.completion);
|
|
|
|
if (pm_async_enabled && dev->power.async_suspend) {
|
|
get_device(dev);
|
|
async_schedule(async_suspend, dev);
|
|
return 0;
|
|
}
|
|
|
|
return __device_suspend(dev, pm_transition, false);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct list_head list;
|
|
ktime_t starttime = ktime_get();
|
|
int error = 0;
|
|
|
|
INIT_LIST_HEAD(&list);
|
|
mutex_lock(&dpm_list_mtx);
|
|
pm_transition = state;
|
|
async_error = 0;
|
|
while (!list_empty(&dpm_list)) {
|
|
struct device *dev = to_device(dpm_list.prev);
|
|
|
|
get_device(dev);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
error = device_suspend(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
if (error) {
|
|
pm_dev_err(dev, state, "", error);
|
|
put_device(dev);
|
|
break;
|
|
}
|
|
if (!list_empty(&dev->power.entry))
|
|
list_move(&dev->power.entry, &list);
|
|
put_device(dev);
|
|
if (async_error)
|
|
break;
|
|
}
|
|
list_splice(&list, dpm_list.prev);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
async_synchronize_full();
|
|
if (!error)
|
|
error = async_error;
|
|
if (!error)
|
|
dpm_show_time(starttime, state, NULL);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int error = 0;
|
|
|
|
device_lock(dev);
|
|
|
|
if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) {
|
|
pm_dev_dbg(dev, state, "preparing ");
|
|
error = dev->bus->pm->prepare(dev);
|
|
suspend_report_result(dev->bus->pm->prepare, error);
|
|
if (error)
|
|
goto End;
|
|
}
|
|
|
|
if (dev->type && dev->type->pm && dev->type->pm->prepare) {
|
|
pm_dev_dbg(dev, state, "preparing type ");
|
|
error = dev->type->pm->prepare(dev);
|
|
suspend_report_result(dev->type->pm->prepare, error);
|
|
if (error)
|
|
goto End;
|
|
}
|
|
|
|
if (dev->class && dev->class->pm && dev->class->pm->prepare) {
|
|
pm_dev_dbg(dev, state, "preparing class ");
|
|
error = dev->class->pm->prepare(dev);
|
|
suspend_report_result(dev->class->pm->prepare, error);
|
|
}
|
|
End:
|
|
device_unlock(dev);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* 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(s) for all devices.
|
|
*/
|
|
static int dpm_prepare(pm_message_t state)
|
|
{
|
|
struct list_head list;
|
|
int error = 0;
|
|
|
|
INIT_LIST_HEAD(&list);
|
|
mutex_lock(&dpm_list_mtx);
|
|
transition_started = true;
|
|
while (!list_empty(&dpm_list)) {
|
|
struct device *dev = to_device(dpm_list.next);
|
|
|
|
get_device(dev);
|
|
dev->power.status = DPM_PREPARING;
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
pm_runtime_get_noresume(dev);
|
|
if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) {
|
|
/* Wake-up requested during system sleep transition. */
|
|
pm_runtime_put_sync(dev);
|
|
error = -EBUSY;
|
|
} else {
|
|
error = device_prepare(dev, state);
|
|
}
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
if (error) {
|
|
dev->power.status = DPM_ON;
|
|
if (error == -EAGAIN) {
|
|
put_device(dev);
|
|
error = 0;
|
|
continue;
|
|
}
|
|
printk(KERN_ERR "PM: Failed to prepare device %s "
|
|
"for power transition: error %d\n",
|
|
kobject_name(&dev->kobj), error);
|
|
put_device(dev);
|
|
break;
|
|
}
|
|
dev->power.status = DPM_SUSPENDING;
|
|
if (!list_empty(&dev->power.entry))
|
|
list_move_tail(&dev->power.entry, &list);
|
|
put_device(dev);
|
|
}
|
|
list_splice(&list, &dpm_list);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* dpm_suspend_start - Prepare devices for PM transition and suspend them.
|
|
* @state: PM transition of the system being carried out.
|
|
*
|
|
* Prepare all non-sysdev devices for system PM transition and execute "suspend"
|
|
* callbacks for them.
|
|
*/
|
|
int dpm_suspend_start(pm_message_t state)
|
|
{
|
|
int error;
|
|
|
|
might_sleep();
|
|
error = dpm_prepare(state);
|
|
if (!error)
|
|
error = dpm_suspend(state);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dpm_suspend_start);
|
|
|
|
void __suspend_report_result(const char *function, void *fn, int ret)
|
|
{
|
|
if (ret)
|
|
printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__suspend_report_result);
|
|
|
|
/**
|
|
* device_pm_wait_for_dev - Wait for suspend/resume of a device to complete.
|
|
* @dev: Device to wait for.
|
|
* @subordinate: Device that needs to wait for @dev.
|
|
*/
|
|
void device_pm_wait_for_dev(struct device *subordinate, struct device *dev)
|
|
{
|
|
dpm_wait(dev, subordinate->power.async_suspend);
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_pm_wait_for_dev);
|