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6f75c3fd56
Consider two devices, A and B, where B is a child of A, and B utilizes asynchronous suspend (it does not matter whether A is sync or async). If B fails to suspend_noirq() or suspend_late(), or is interrupted by a wakeup (pm_wakeup_pending()), then it aborts and sets the async_error variable. However, device A does not (immediately) check the async_error variable; it may continue to run its own suspend_noirq()/suspend_late() callback. This is bad. We can resolve this problem by doing our error and wakeup checking (particularly, for the async_error flag) after waiting for children to suspend, instead of before. This also helps align the logic for the noirq and late suspend cases with the logic in __device_suspend(). It's easy to observe this erroneous behavior by, for example, forcing a device to sleep a bit in its suspend_noirq() (to ensure the parent is waiting for the child to complete), then return an error, and watch the parent suspend_noirq() still get called. (Or similarly, fake a wakeup event at the right (or is it wrong?) time.) Fixes:de377b3972
(PM / sleep: Asynchronous threads for suspend_late) Fixes:28b6fd6e37
(PM / sleep: Asynchronous threads for suspend_noirq) Reported-by: Jeffy Chen <jeffy.chen@rock-chips.com> Signed-off-by: Brian Norris <briannorris@chromium.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1767 lines
44 KiB
C
1767 lines
44 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 initialize 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/export.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/pm-trace.h>
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#include <linux/pm_wakeirq.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 <linux/suspend.h>
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#include <trace/events/power.h>
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#include <linux/cpufreq.h>
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#include <linux/cpuidle.h>
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#include <linux/timer.h>
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#include "../base.h"
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#include "power.h"
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typedef int (*pm_callback_t)(struct device *);
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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 LIST_HEAD(dpm_prepared_list);
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static LIST_HEAD(dpm_suspended_list);
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static LIST_HEAD(dpm_late_early_list);
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static LIST_HEAD(dpm_noirq_list);
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struct suspend_stats suspend_stats;
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static DEFINE_MUTEX(dpm_list_mtx);
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static pm_message_t pm_transition;
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static int async_error;
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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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/**
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* device_pm_sleep_init - Initialize system suspend-related device fields.
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* @dev: Device object being initialized.
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*/
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void device_pm_sleep_init(struct device *dev)
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{
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dev->power.is_prepared = false;
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dev->power.is_suspended = false;
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dev->power.is_noirq_suspended = false;
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dev->power.is_late_suspended = false;
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init_completion(&dev->power.completion);
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complete_all(&dev->power.completion);
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dev->power.wakeup = NULL;
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INIT_LIST_HEAD(&dev->power.entry);
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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", dev_name(dev));
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device_pm_check_callbacks(dev);
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mutex_lock(&dpm_list_mtx);
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if (dev->parent && dev->parent->power.is_prepared)
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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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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", dev_name(dev));
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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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device_wakeup_disable(dev);
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pm_runtime_remove(dev);
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device_pm_check_callbacks(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", dev_name(deva),
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devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
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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", dev_name(deva),
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devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
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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", dev_name(dev));
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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 (pm_print_times_enabled) {
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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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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, pm_message_t state, char *info)
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{
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ktime_t rettime;
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s64 nsecs;
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rettime = ktime_get();
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nsecs = (s64) ktime_to_ns(ktime_sub(rettime, calltime));
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if (pm_print_times_enabled) {
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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)nsecs >> 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 - Return the PM operation appropriate for given PM event.
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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 pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state)
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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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return ops->suspend;
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case PM_EVENT_RESUME:
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return ops->resume;
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#endif /* CONFIG_SUSPEND */
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#ifdef CONFIG_HIBERNATE_CALLBACKS
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case PM_EVENT_FREEZE:
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case PM_EVENT_QUIESCE:
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return ops->freeze;
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case PM_EVENT_HIBERNATE:
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return ops->poweroff;
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case PM_EVENT_THAW:
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case PM_EVENT_RECOVER:
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return ops->thaw;
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break;
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case PM_EVENT_RESTORE:
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return ops->restore;
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#endif /* CONFIG_HIBERNATE_CALLBACKS */
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}
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return NULL;
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}
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/**
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* pm_late_early_op - Return the PM operation appropriate for given PM event.
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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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* Runtime PM is disabled for @dev while this function is being executed.
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*/
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static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops,
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pm_message_t state)
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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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return ops->suspend_late;
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case PM_EVENT_RESUME:
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return ops->resume_early;
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#endif /* CONFIG_SUSPEND */
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#ifdef CONFIG_HIBERNATE_CALLBACKS
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case PM_EVENT_FREEZE:
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case PM_EVENT_QUIESCE:
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return ops->freeze_late;
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case PM_EVENT_HIBERNATE:
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return ops->poweroff_late;
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case PM_EVENT_THAW:
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case PM_EVENT_RECOVER:
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return ops->thaw_early;
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case PM_EVENT_RESTORE:
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return ops->restore_early;
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#endif /* CONFIG_HIBERNATE_CALLBACKS */
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}
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return NULL;
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}
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/**
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* pm_noirq_op - Return the PM operation appropriate for given PM event.
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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 pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state)
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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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return ops->suspend_noirq;
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case PM_EVENT_RESUME:
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return ops->resume_noirq;
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#endif /* CONFIG_SUSPEND */
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#ifdef CONFIG_HIBERNATE_CALLBACKS
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case PM_EVENT_FREEZE:
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case PM_EVENT_QUIESCE:
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return ops->freeze_noirq;
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case PM_EVENT_HIBERNATE:
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return ops->poweroff_noirq;
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case PM_EVENT_THAW:
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case PM_EVENT_RECOVER:
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return ops->thaw_noirq;
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case PM_EVENT_RESTORE:
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return ops->restore_noirq;
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#endif /* CONFIG_HIBERNATE_CALLBACKS */
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}
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return NULL;
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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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dev_name(dev), 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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u64 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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static int dpm_run_callback(pm_callback_t cb, struct device *dev,
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pm_message_t state, char *info)
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{
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ktime_t calltime;
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int error;
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if (!cb)
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return 0;
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calltime = initcall_debug_start(dev);
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pm_dev_dbg(dev, state, info);
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trace_device_pm_callback_start(dev, info, state.event);
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error = cb(dev);
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trace_device_pm_callback_end(dev, error);
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suspend_report_result(cb, error);
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initcall_debug_report(dev, calltime, error, state, info);
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return error;
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}
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#ifdef CONFIG_DPM_WATCHDOG
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struct dpm_watchdog {
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struct device *dev;
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struct task_struct *tsk;
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struct timer_list timer;
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};
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#define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \
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struct dpm_watchdog wd
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/**
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* dpm_watchdog_handler - Driver suspend / resume watchdog handler.
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* @data: Watchdog object address.
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*
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* Called when a driver has timed out suspending or resuming.
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* There's not much we can do here to recover so panic() to
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* capture a crash-dump in pstore.
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*/
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static void dpm_watchdog_handler(unsigned long data)
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{
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struct dpm_watchdog *wd = (void *)data;
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dev_emerg(wd->dev, "**** DPM device timeout ****\n");
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show_stack(wd->tsk, NULL);
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panic("%s %s: unrecoverable failure\n",
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dev_driver_string(wd->dev), dev_name(wd->dev));
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}
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/**
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* dpm_watchdog_set - Enable pm watchdog for given device.
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* @wd: Watchdog. Must be allocated on the stack.
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* @dev: Device to handle.
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*/
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static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev)
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{
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struct timer_list *timer = &wd->timer;
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wd->dev = dev;
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wd->tsk = current;
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init_timer_on_stack(timer);
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/* use same timeout value for both suspend and resume */
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timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT;
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timer->function = dpm_watchdog_handler;
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timer->data = (unsigned long)wd;
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add_timer(timer);
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}
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/**
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* dpm_watchdog_clear - Disable suspend/resume watchdog.
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* @wd: Watchdog to disable.
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*/
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static void dpm_watchdog_clear(struct dpm_watchdog *wd)
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{
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struct timer_list *timer = &wd->timer;
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del_timer_sync(timer);
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destroy_timer_on_stack(timer);
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}
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#else
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#define DECLARE_DPM_WATCHDOG_ON_STACK(wd)
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#define dpm_watchdog_set(x, y)
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#define dpm_watchdog_clear(x)
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#endif
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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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* @async: If true, the device is being resumed asynchronously.
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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, bool async)
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{
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pm_callback_t callback = NULL;
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char *info = NULL;
|
|
int error = 0;
|
|
|
|
TRACE_DEVICE(dev);
|
|
TRACE_RESUME(0);
|
|
|
|
if (dev->power.syscore || dev->power.direct_complete)
|
|
goto Out;
|
|
|
|
if (!dev->power.is_noirq_suspended)
|
|
goto Out;
|
|
|
|
dpm_wait(dev->parent, async);
|
|
|
|
if (dev->pm_domain) {
|
|
info = "noirq power domain ";
|
|
callback = pm_noirq_op(&dev->pm_domain->ops, state);
|
|
} else if (dev->type && dev->type->pm) {
|
|
info = "noirq type ";
|
|
callback = pm_noirq_op(dev->type->pm, state);
|
|
} else if (dev->class && dev->class->pm) {
|
|
info = "noirq class ";
|
|
callback = pm_noirq_op(dev->class->pm, state);
|
|
} else if (dev->bus && dev->bus->pm) {
|
|
info = "noirq bus ";
|
|
callback = pm_noirq_op(dev->bus->pm, state);
|
|
}
|
|
|
|
if (!callback && dev->driver && dev->driver->pm) {
|
|
info = "noirq driver ";
|
|
callback = pm_noirq_op(dev->driver->pm, state);
|
|
}
|
|
|
|
error = dpm_run_callback(callback, dev, state, info);
|
|
dev->power.is_noirq_suspended = false;
|
|
|
|
Out:
|
|
complete_all(&dev->power.completion);
|
|
TRACE_RESUME(error);
|
|
return error;
|
|
}
|
|
|
|
static bool is_async(struct device *dev)
|
|
{
|
|
return dev->power.async_suspend && pm_async_enabled
|
|
&& !pm_trace_is_enabled();
|
|
}
|
|
|
|
static void async_resume_noirq(void *data, async_cookie_t cookie)
|
|
{
|
|
struct device *dev = (struct device *)data;
|
|
int error;
|
|
|
|
error = device_resume_noirq(dev, pm_transition, true);
|
|
if (error)
|
|
pm_dev_err(dev, pm_transition, " async", error);
|
|
|
|
put_device(dev);
|
|
}
|
|
|
|
/**
|
|
* dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
|
|
* @state: PM transition of the system being carried out.
|
|
*
|
|
* Call the "noirq" resume handlers for all devices in dpm_noirq_list and
|
|
* enable device drivers to receive interrupts.
|
|
*/
|
|
void dpm_resume_noirq(pm_message_t state)
|
|
{
|
|
struct device *dev;
|
|
ktime_t starttime = ktime_get();
|
|
|
|
trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true);
|
|
mutex_lock(&dpm_list_mtx);
|
|
pm_transition = state;
|
|
|
|
/*
|
|
* Advanced the async threads upfront,
|
|
* in case the starting of async threads is
|
|
* delayed by non-async resuming devices.
|
|
*/
|
|
list_for_each_entry(dev, &dpm_noirq_list, power.entry) {
|
|
reinit_completion(&dev->power.completion);
|
|
if (is_async(dev)) {
|
|
get_device(dev);
|
|
async_schedule(async_resume_noirq, dev);
|
|
}
|
|
}
|
|
|
|
while (!list_empty(&dpm_noirq_list)) {
|
|
dev = to_device(dpm_noirq_list.next);
|
|
get_device(dev);
|
|
list_move_tail(&dev->power.entry, &dpm_late_early_list);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
if (!is_async(dev)) {
|
|
int error;
|
|
|
|
error = device_resume_noirq(dev, state, false);
|
|
if (error) {
|
|
suspend_stats.failed_resume_noirq++;
|
|
dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
|
|
dpm_save_failed_dev(dev_name(dev));
|
|
pm_dev_err(dev, state, " noirq", error);
|
|
}
|
|
}
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
put_device(dev);
|
|
}
|
|
mutex_unlock(&dpm_list_mtx);
|
|
async_synchronize_full();
|
|
dpm_show_time(starttime, state, "noirq");
|
|
resume_device_irqs();
|
|
device_wakeup_disarm_wake_irqs();
|
|
cpuidle_resume();
|
|
trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false);
|
|
}
|
|
|
|
/**
|
|
* device_resume_early - Execute an "early resume" callback 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.
|
|
*
|
|
* Runtime PM is disabled for @dev while this function is being executed.
|
|
*/
|
|
static int device_resume_early(struct device *dev, pm_message_t state, bool async)
|
|
{
|
|
pm_callback_t callback = NULL;
|
|
char *info = NULL;
|
|
int error = 0;
|
|
|
|
TRACE_DEVICE(dev);
|
|
TRACE_RESUME(0);
|
|
|
|
if (dev->power.syscore || dev->power.direct_complete)
|
|
goto Out;
|
|
|
|
if (!dev->power.is_late_suspended)
|
|
goto Out;
|
|
|
|
dpm_wait(dev->parent, async);
|
|
|
|
if (dev->pm_domain) {
|
|
info = "early power domain ";
|
|
callback = pm_late_early_op(&dev->pm_domain->ops, state);
|
|
} else if (dev->type && dev->type->pm) {
|
|
info = "early type ";
|
|
callback = pm_late_early_op(dev->type->pm, state);
|
|
} else if (dev->class && dev->class->pm) {
|
|
info = "early class ";
|
|
callback = pm_late_early_op(dev->class->pm, state);
|
|
} else if (dev->bus && dev->bus->pm) {
|
|
info = "early bus ";
|
|
callback = pm_late_early_op(dev->bus->pm, state);
|
|
}
|
|
|
|
if (!callback && dev->driver && dev->driver->pm) {
|
|
info = "early driver ";
|
|
callback = pm_late_early_op(dev->driver->pm, state);
|
|
}
|
|
|
|
error = dpm_run_callback(callback, dev, state, info);
|
|
dev->power.is_late_suspended = false;
|
|
|
|
Out:
|
|
TRACE_RESUME(error);
|
|
|
|
pm_runtime_enable(dev);
|
|
complete_all(&dev->power.completion);
|
|
return error;
|
|
}
|
|
|
|
static void async_resume_early(void *data, async_cookie_t cookie)
|
|
{
|
|
struct device *dev = (struct device *)data;
|
|
int error;
|
|
|
|
error = device_resume_early(dev, pm_transition, true);
|
|
if (error)
|
|
pm_dev_err(dev, pm_transition, " async", error);
|
|
|
|
put_device(dev);
|
|
}
|
|
|
|
/**
|
|
* dpm_resume_early - Execute "early resume" callbacks for all devices.
|
|
* @state: PM transition of the system being carried out.
|
|
*/
|
|
void dpm_resume_early(pm_message_t state)
|
|
{
|
|
struct device *dev;
|
|
ktime_t starttime = ktime_get();
|
|
|
|
trace_suspend_resume(TPS("dpm_resume_early"), state.event, true);
|
|
mutex_lock(&dpm_list_mtx);
|
|
pm_transition = state;
|
|
|
|
/*
|
|
* Advanced the async threads upfront,
|
|
* in case the starting of async threads is
|
|
* delayed by non-async resuming devices.
|
|
*/
|
|
list_for_each_entry(dev, &dpm_late_early_list, power.entry) {
|
|
reinit_completion(&dev->power.completion);
|
|
if (is_async(dev)) {
|
|
get_device(dev);
|
|
async_schedule(async_resume_early, dev);
|
|
}
|
|
}
|
|
|
|
while (!list_empty(&dpm_late_early_list)) {
|
|
dev = to_device(dpm_late_early_list.next);
|
|
get_device(dev);
|
|
list_move_tail(&dev->power.entry, &dpm_suspended_list);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
if (!is_async(dev)) {
|
|
int error;
|
|
|
|
error = device_resume_early(dev, state, false);
|
|
if (error) {
|
|
suspend_stats.failed_resume_early++;
|
|
dpm_save_failed_step(SUSPEND_RESUME_EARLY);
|
|
dpm_save_failed_dev(dev_name(dev));
|
|
pm_dev_err(dev, state, " early", error);
|
|
}
|
|
}
|
|
mutex_lock(&dpm_list_mtx);
|
|
put_device(dev);
|
|
}
|
|
mutex_unlock(&dpm_list_mtx);
|
|
async_synchronize_full();
|
|
dpm_show_time(starttime, state, "early");
|
|
trace_suspend_resume(TPS("dpm_resume_early"), state.event, false);
|
|
}
|
|
|
|
/**
|
|
* dpm_resume_start - Execute "noirq" and "early" device callbacks.
|
|
* @state: PM transition of the system being carried out.
|
|
*/
|
|
void dpm_resume_start(pm_message_t state)
|
|
{
|
|
dpm_resume_noirq(state);
|
|
dpm_resume_early(state);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dpm_resume_start);
|
|
|
|
/**
|
|
* device_resume - Execute "resume" callbacks for given device.
|
|
* @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)
|
|
{
|
|
pm_callback_t callback = NULL;
|
|
char *info = NULL;
|
|
int error = 0;
|
|
DECLARE_DPM_WATCHDOG_ON_STACK(wd);
|
|
|
|
TRACE_DEVICE(dev);
|
|
TRACE_RESUME(0);
|
|
|
|
if (dev->power.syscore)
|
|
goto Complete;
|
|
|
|
if (dev->power.direct_complete) {
|
|
/* Match the pm_runtime_disable() in __device_suspend(). */
|
|
pm_runtime_enable(dev);
|
|
goto Complete;
|
|
}
|
|
|
|
dpm_wait(dev->parent, async);
|
|
dpm_watchdog_set(&wd, dev);
|
|
device_lock(dev);
|
|
|
|
/*
|
|
* This is a fib. But we'll allow new children to be added below
|
|
* a resumed device, even if the device hasn't been completed yet.
|
|
*/
|
|
dev->power.is_prepared = false;
|
|
|
|
if (!dev->power.is_suspended)
|
|
goto Unlock;
|
|
|
|
if (dev->pm_domain) {
|
|
info = "power domain ";
|
|
callback = pm_op(&dev->pm_domain->ops, state);
|
|
goto Driver;
|
|
}
|
|
|
|
if (dev->type && dev->type->pm) {
|
|
info = "type ";
|
|
callback = pm_op(dev->type->pm, state);
|
|
goto Driver;
|
|
}
|
|
|
|
if (dev->class) {
|
|
if (dev->class->pm) {
|
|
info = "class ";
|
|
callback = pm_op(dev->class->pm, state);
|
|
goto Driver;
|
|
} else if (dev->class->resume) {
|
|
info = "legacy class ";
|
|
callback = dev->class->resume;
|
|
goto End;
|
|
}
|
|
}
|
|
|
|
if (dev->bus) {
|
|
if (dev->bus->pm) {
|
|
info = "bus ";
|
|
callback = pm_op(dev->bus->pm, state);
|
|
} else if (dev->bus->resume) {
|
|
info = "legacy bus ";
|
|
callback = dev->bus->resume;
|
|
goto End;
|
|
}
|
|
}
|
|
|
|
Driver:
|
|
if (!callback && dev->driver && dev->driver->pm) {
|
|
info = "driver ";
|
|
callback = pm_op(dev->driver->pm, state);
|
|
}
|
|
|
|
End:
|
|
error = dpm_run_callback(callback, dev, state, info);
|
|
dev->power.is_suspended = false;
|
|
|
|
Unlock:
|
|
device_unlock(dev);
|
|
dpm_watchdog_clear(&wd);
|
|
|
|
Complete:
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
void dpm_resume(pm_message_t state)
|
|
{
|
|
struct device *dev;
|
|
ktime_t starttime = ktime_get();
|
|
|
|
trace_suspend_resume(TPS("dpm_resume"), state.event, true);
|
|
might_sleep();
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
pm_transition = state;
|
|
async_error = 0;
|
|
|
|
list_for_each_entry(dev, &dpm_suspended_list, power.entry) {
|
|
reinit_completion(&dev->power.completion);
|
|
if (is_async(dev)) {
|
|
get_device(dev);
|
|
async_schedule(async_resume, dev);
|
|
}
|
|
}
|
|
|
|
while (!list_empty(&dpm_suspended_list)) {
|
|
dev = to_device(dpm_suspended_list.next);
|
|
get_device(dev);
|
|
if (!is_async(dev)) {
|
|
int error;
|
|
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
error = device_resume(dev, state, false);
|
|
if (error) {
|
|
suspend_stats.failed_resume++;
|
|
dpm_save_failed_step(SUSPEND_RESUME);
|
|
dpm_save_failed_dev(dev_name(dev));
|
|
pm_dev_err(dev, state, "", error);
|
|
}
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
}
|
|
if (!list_empty(&dev->power.entry))
|
|
list_move_tail(&dev->power.entry, &dpm_prepared_list);
|
|
put_device(dev);
|
|
}
|
|
mutex_unlock(&dpm_list_mtx);
|
|
async_synchronize_full();
|
|
dpm_show_time(starttime, state, NULL);
|
|
|
|
cpufreq_resume();
|
|
trace_suspend_resume(TPS("dpm_resume"), state.event, false);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
void (*callback)(struct device *) = NULL;
|
|
char *info = NULL;
|
|
|
|
if (dev->power.syscore)
|
|
return;
|
|
|
|
device_lock(dev);
|
|
|
|
if (dev->pm_domain) {
|
|
info = "completing power domain ";
|
|
callback = dev->pm_domain->ops.complete;
|
|
} else if (dev->type && dev->type->pm) {
|
|
info = "completing type ";
|
|
callback = dev->type->pm->complete;
|
|
} else if (dev->class && dev->class->pm) {
|
|
info = "completing class ";
|
|
callback = dev->class->pm->complete;
|
|
} else if (dev->bus && dev->bus->pm) {
|
|
info = "completing bus ";
|
|
callback = dev->bus->pm->complete;
|
|
}
|
|
|
|
if (!callback && dev->driver && dev->driver->pm) {
|
|
info = "completing driver ";
|
|
callback = dev->driver->pm->complete;
|
|
}
|
|
|
|
if (callback) {
|
|
pm_dev_dbg(dev, state, info);
|
|
callback(dev);
|
|
}
|
|
|
|
device_unlock(dev);
|
|
|
|
pm_runtime_put(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).
|
|
*/
|
|
void dpm_complete(pm_message_t state)
|
|
{
|
|
struct list_head list;
|
|
|
|
trace_suspend_resume(TPS("dpm_complete"), state.event, true);
|
|
might_sleep();
|
|
|
|
INIT_LIST_HEAD(&list);
|
|
mutex_lock(&dpm_list_mtx);
|
|
while (!list_empty(&dpm_prepared_list)) {
|
|
struct device *dev = to_device(dpm_prepared_list.prev);
|
|
|
|
get_device(dev);
|
|
dev->power.is_prepared = false;
|
|
list_move(&dev->power.entry, &list);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
trace_device_pm_callback_start(dev, "", state.event);
|
|
device_complete(dev, state);
|
|
trace_device_pm_callback_end(dev, 0);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
put_device(dev);
|
|
}
|
|
list_splice(&list, &dpm_list);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
/* Allow device probing and trigger re-probing of deferred devices */
|
|
device_unblock_probing();
|
|
trace_suspend_resume(TPS("dpm_complete"), state.event, false);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
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.
|
|
* @async: If true, the device is being suspended asynchronously.
|
|
*
|
|
* 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, bool async)
|
|
{
|
|
pm_callback_t callback = NULL;
|
|
char *info = NULL;
|
|
int error = 0;
|
|
|
|
TRACE_DEVICE(dev);
|
|
TRACE_SUSPEND(0);
|
|
|
|
dpm_wait_for_children(dev, async);
|
|
|
|
if (async_error)
|
|
goto Complete;
|
|
|
|
if (pm_wakeup_pending()) {
|
|
async_error = -EBUSY;
|
|
goto Complete;
|
|
}
|
|
|
|
if (dev->power.syscore || dev->power.direct_complete)
|
|
goto Complete;
|
|
|
|
if (dev->pm_domain) {
|
|
info = "noirq power domain ";
|
|
callback = pm_noirq_op(&dev->pm_domain->ops, state);
|
|
} else if (dev->type && dev->type->pm) {
|
|
info = "noirq type ";
|
|
callback = pm_noirq_op(dev->type->pm, state);
|
|
} else if (dev->class && dev->class->pm) {
|
|
info = "noirq class ";
|
|
callback = pm_noirq_op(dev->class->pm, state);
|
|
} else if (dev->bus && dev->bus->pm) {
|
|
info = "noirq bus ";
|
|
callback = pm_noirq_op(dev->bus->pm, state);
|
|
}
|
|
|
|
if (!callback && dev->driver && dev->driver->pm) {
|
|
info = "noirq driver ";
|
|
callback = pm_noirq_op(dev->driver->pm, state);
|
|
}
|
|
|
|
error = dpm_run_callback(callback, dev, state, info);
|
|
if (!error)
|
|
dev->power.is_noirq_suspended = true;
|
|
else
|
|
async_error = error;
|
|
|
|
Complete:
|
|
complete_all(&dev->power.completion);
|
|
TRACE_SUSPEND(error);
|
|
return error;
|
|
}
|
|
|
|
static void async_suspend_noirq(void *data, async_cookie_t cookie)
|
|
{
|
|
struct device *dev = (struct device *)data;
|
|
int error;
|
|
|
|
error = __device_suspend_noirq(dev, pm_transition, true);
|
|
if (error) {
|
|
dpm_save_failed_dev(dev_name(dev));
|
|
pm_dev_err(dev, pm_transition, " async", error);
|
|
}
|
|
|
|
put_device(dev);
|
|
}
|
|
|
|
static int device_suspend_noirq(struct device *dev)
|
|
{
|
|
reinit_completion(&dev->power.completion);
|
|
|
|
if (is_async(dev)) {
|
|
get_device(dev);
|
|
async_schedule(async_suspend_noirq, dev);
|
|
return 0;
|
|
}
|
|
return __device_suspend_noirq(dev, pm_transition, false);
|
|
}
|
|
|
|
/**
|
|
* dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices.
|
|
* @state: PM transition of the system being carried out.
|
|
*
|
|
* Prevent device drivers from receiving interrupts and call the "noirq" suspend
|
|
* handlers for all non-sysdev devices.
|
|
*/
|
|
int dpm_suspend_noirq(pm_message_t state)
|
|
{
|
|
ktime_t starttime = ktime_get();
|
|
int error = 0;
|
|
|
|
trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true);
|
|
cpuidle_pause();
|
|
device_wakeup_arm_wake_irqs();
|
|
suspend_device_irqs();
|
|
mutex_lock(&dpm_list_mtx);
|
|
pm_transition = state;
|
|
async_error = 0;
|
|
|
|
while (!list_empty(&dpm_late_early_list)) {
|
|
struct device *dev = to_device(dpm_late_early_list.prev);
|
|
|
|
get_device(dev);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
error = device_suspend_noirq(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
if (error) {
|
|
pm_dev_err(dev, state, " noirq", error);
|
|
dpm_save_failed_dev(dev_name(dev));
|
|
put_device(dev);
|
|
break;
|
|
}
|
|
if (!list_empty(&dev->power.entry))
|
|
list_move(&dev->power.entry, &dpm_noirq_list);
|
|
put_device(dev);
|
|
|
|
if (async_error)
|
|
break;
|
|
}
|
|
mutex_unlock(&dpm_list_mtx);
|
|
async_synchronize_full();
|
|
if (!error)
|
|
error = async_error;
|
|
|
|
if (error) {
|
|
suspend_stats.failed_suspend_noirq++;
|
|
dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
|
|
dpm_resume_noirq(resume_event(state));
|
|
} else {
|
|
dpm_show_time(starttime, state, "noirq");
|
|
}
|
|
trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* device_suspend_late - Execute a "late suspend" callback 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.
|
|
*
|
|
* Runtime PM is disabled for @dev while this function is being executed.
|
|
*/
|
|
static int __device_suspend_late(struct device *dev, pm_message_t state, bool async)
|
|
{
|
|
pm_callback_t callback = NULL;
|
|
char *info = NULL;
|
|
int error = 0;
|
|
|
|
TRACE_DEVICE(dev);
|
|
TRACE_SUSPEND(0);
|
|
|
|
__pm_runtime_disable(dev, false);
|
|
|
|
dpm_wait_for_children(dev, async);
|
|
|
|
if (async_error)
|
|
goto Complete;
|
|
|
|
if (pm_wakeup_pending()) {
|
|
async_error = -EBUSY;
|
|
goto Complete;
|
|
}
|
|
|
|
if (dev->power.syscore || dev->power.direct_complete)
|
|
goto Complete;
|
|
|
|
if (dev->pm_domain) {
|
|
info = "late power domain ";
|
|
callback = pm_late_early_op(&dev->pm_domain->ops, state);
|
|
} else if (dev->type && dev->type->pm) {
|
|
info = "late type ";
|
|
callback = pm_late_early_op(dev->type->pm, state);
|
|
} else if (dev->class && dev->class->pm) {
|
|
info = "late class ";
|
|
callback = pm_late_early_op(dev->class->pm, state);
|
|
} else if (dev->bus && dev->bus->pm) {
|
|
info = "late bus ";
|
|
callback = pm_late_early_op(dev->bus->pm, state);
|
|
}
|
|
|
|
if (!callback && dev->driver && dev->driver->pm) {
|
|
info = "late driver ";
|
|
callback = pm_late_early_op(dev->driver->pm, state);
|
|
}
|
|
|
|
error = dpm_run_callback(callback, dev, state, info);
|
|
if (!error)
|
|
dev->power.is_late_suspended = true;
|
|
else
|
|
async_error = error;
|
|
|
|
Complete:
|
|
TRACE_SUSPEND(error);
|
|
complete_all(&dev->power.completion);
|
|
return error;
|
|
}
|
|
|
|
static void async_suspend_late(void *data, async_cookie_t cookie)
|
|
{
|
|
struct device *dev = (struct device *)data;
|
|
int error;
|
|
|
|
error = __device_suspend_late(dev, pm_transition, true);
|
|
if (error) {
|
|
dpm_save_failed_dev(dev_name(dev));
|
|
pm_dev_err(dev, pm_transition, " async", error);
|
|
}
|
|
put_device(dev);
|
|
}
|
|
|
|
static int device_suspend_late(struct device *dev)
|
|
{
|
|
reinit_completion(&dev->power.completion);
|
|
|
|
if (is_async(dev)) {
|
|
get_device(dev);
|
|
async_schedule(async_suspend_late, dev);
|
|
return 0;
|
|
}
|
|
|
|
return __device_suspend_late(dev, pm_transition, false);
|
|
}
|
|
|
|
/**
|
|
* dpm_suspend_late - Execute "late suspend" callbacks for all devices.
|
|
* @state: PM transition of the system being carried out.
|
|
*/
|
|
int dpm_suspend_late(pm_message_t state)
|
|
{
|
|
ktime_t starttime = ktime_get();
|
|
int error = 0;
|
|
|
|
trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true);
|
|
mutex_lock(&dpm_list_mtx);
|
|
pm_transition = state;
|
|
async_error = 0;
|
|
|
|
while (!list_empty(&dpm_suspended_list)) {
|
|
struct device *dev = to_device(dpm_suspended_list.prev);
|
|
|
|
get_device(dev);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
error = device_suspend_late(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
if (!list_empty(&dev->power.entry))
|
|
list_move(&dev->power.entry, &dpm_late_early_list);
|
|
|
|
if (error) {
|
|
pm_dev_err(dev, state, " late", error);
|
|
dpm_save_failed_dev(dev_name(dev));
|
|
put_device(dev);
|
|
break;
|
|
}
|
|
put_device(dev);
|
|
|
|
if (async_error)
|
|
break;
|
|
}
|
|
mutex_unlock(&dpm_list_mtx);
|
|
async_synchronize_full();
|
|
if (!error)
|
|
error = async_error;
|
|
if (error) {
|
|
suspend_stats.failed_suspend_late++;
|
|
dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
|
|
dpm_resume_early(resume_event(state));
|
|
} else {
|
|
dpm_show_time(starttime, state, "late");
|
|
}
|
|
trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks.
|
|
* @state: PM transition of the system being carried out.
|
|
*/
|
|
int dpm_suspend_end(pm_message_t state)
|
|
{
|
|
int error = dpm_suspend_late(state);
|
|
if (error)
|
|
return error;
|
|
|
|
error = dpm_suspend_noirq(state);
|
|
if (error) {
|
|
dpm_resume_early(resume_event(state));
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dpm_suspend_end);
|
|
|
|
/**
|
|
* 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.
|
|
* @info: string description of caller.
|
|
*/
|
|
static int legacy_suspend(struct device *dev, pm_message_t state,
|
|
int (*cb)(struct device *dev, pm_message_t state),
|
|
char *info)
|
|
{
|
|
int error;
|
|
ktime_t calltime;
|
|
|
|
calltime = initcall_debug_start(dev);
|
|
|
|
trace_device_pm_callback_start(dev, info, state.event);
|
|
error = cb(dev, state);
|
|
trace_device_pm_callback_end(dev, error);
|
|
suspend_report_result(cb, error);
|
|
|
|
initcall_debug_report(dev, calltime, error, state, info);
|
|
|
|
return 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)
|
|
{
|
|
pm_callback_t callback = NULL;
|
|
char *info = NULL;
|
|
int error = 0;
|
|
DECLARE_DPM_WATCHDOG_ON_STACK(wd);
|
|
|
|
TRACE_DEVICE(dev);
|
|
TRACE_SUSPEND(0);
|
|
|
|
dpm_wait_for_children(dev, async);
|
|
|
|
if (async_error)
|
|
goto Complete;
|
|
|
|
/*
|
|
* If a device configured to wake up the system from sleep states
|
|
* has been suspended at run time and there's a resume request pending
|
|
* for it, this is equivalent to the device signaling wakeup, so the
|
|
* system suspend operation should be aborted.
|
|
*/
|
|
if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
|
|
pm_wakeup_event(dev, 0);
|
|
|
|
if (pm_wakeup_pending()) {
|
|
async_error = -EBUSY;
|
|
goto Complete;
|
|
}
|
|
|
|
if (dev->power.syscore)
|
|
goto Complete;
|
|
|
|
if (dev->power.direct_complete) {
|
|
if (pm_runtime_status_suspended(dev)) {
|
|
pm_runtime_disable(dev);
|
|
if (pm_runtime_status_suspended(dev))
|
|
goto Complete;
|
|
|
|
pm_runtime_enable(dev);
|
|
}
|
|
dev->power.direct_complete = false;
|
|
}
|
|
|
|
dpm_watchdog_set(&wd, dev);
|
|
device_lock(dev);
|
|
|
|
if (dev->pm_domain) {
|
|
info = "power domain ";
|
|
callback = pm_op(&dev->pm_domain->ops, state);
|
|
goto Run;
|
|
}
|
|
|
|
if (dev->type && dev->type->pm) {
|
|
info = "type ";
|
|
callback = pm_op(dev->type->pm, state);
|
|
goto Run;
|
|
}
|
|
|
|
if (dev->class) {
|
|
if (dev->class->pm) {
|
|
info = "class ";
|
|
callback = pm_op(dev->class->pm, state);
|
|
goto Run;
|
|
} else if (dev->class->suspend) {
|
|
pm_dev_dbg(dev, state, "legacy class ");
|
|
error = legacy_suspend(dev, state, dev->class->suspend,
|
|
"legacy class ");
|
|
goto End;
|
|
}
|
|
}
|
|
|
|
if (dev->bus) {
|
|
if (dev->bus->pm) {
|
|
info = "bus ";
|
|
callback = pm_op(dev->bus->pm, state);
|
|
} else if (dev->bus->suspend) {
|
|
pm_dev_dbg(dev, state, "legacy bus ");
|
|
error = legacy_suspend(dev, state, dev->bus->suspend,
|
|
"legacy bus ");
|
|
goto End;
|
|
}
|
|
}
|
|
|
|
Run:
|
|
if (!callback && dev->driver && dev->driver->pm) {
|
|
info = "driver ";
|
|
callback = pm_op(dev->driver->pm, state);
|
|
}
|
|
|
|
error = dpm_run_callback(callback, dev, state, info);
|
|
|
|
End:
|
|
if (!error) {
|
|
struct device *parent = dev->parent;
|
|
|
|
dev->power.is_suspended = true;
|
|
if (parent) {
|
|
spin_lock_irq(&parent->power.lock);
|
|
|
|
dev->parent->power.direct_complete = false;
|
|
if (dev->power.wakeup_path
|
|
&& !dev->parent->power.ignore_children)
|
|
dev->parent->power.wakeup_path = true;
|
|
|
|
spin_unlock_irq(&parent->power.lock);
|
|
}
|
|
}
|
|
|
|
device_unlock(dev);
|
|
dpm_watchdog_clear(&wd);
|
|
|
|
Complete:
|
|
complete_all(&dev->power.completion);
|
|
if (error)
|
|
async_error = error;
|
|
|
|
TRACE_SUSPEND(error);
|
|
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) {
|
|
dpm_save_failed_dev(dev_name(dev));
|
|
pm_dev_err(dev, pm_transition, " async", error);
|
|
}
|
|
|
|
put_device(dev);
|
|
}
|
|
|
|
static int device_suspend(struct device *dev)
|
|
{
|
|
reinit_completion(&dev->power.completion);
|
|
|
|
if (is_async(dev)) {
|
|
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.
|
|
*/
|
|
int dpm_suspend(pm_message_t state)
|
|
{
|
|
ktime_t starttime = ktime_get();
|
|
int error = 0;
|
|
|
|
trace_suspend_resume(TPS("dpm_suspend"), state.event, true);
|
|
might_sleep();
|
|
|
|
cpufreq_suspend();
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
pm_transition = state;
|
|
async_error = 0;
|
|
while (!list_empty(&dpm_prepared_list)) {
|
|
struct device *dev = to_device(dpm_prepared_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);
|
|
dpm_save_failed_dev(dev_name(dev));
|
|
put_device(dev);
|
|
break;
|
|
}
|
|
if (!list_empty(&dev->power.entry))
|
|
list_move(&dev->power.entry, &dpm_suspended_list);
|
|
put_device(dev);
|
|
if (async_error)
|
|
break;
|
|
}
|
|
mutex_unlock(&dpm_list_mtx);
|
|
async_synchronize_full();
|
|
if (!error)
|
|
error = async_error;
|
|
if (error) {
|
|
suspend_stats.failed_suspend++;
|
|
dpm_save_failed_step(SUSPEND_SUSPEND);
|
|
} else
|
|
dpm_show_time(starttime, state, NULL);
|
|
trace_suspend_resume(TPS("dpm_suspend"), state.event, false);
|
|
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 (*callback)(struct device *) = NULL;
|
|
int ret = 0;
|
|
|
|
if (dev->power.syscore)
|
|
return 0;
|
|
|
|
/*
|
|
* If a device's parent goes into runtime suspend at the wrong time,
|
|
* it won't be possible to resume the device. To prevent this we
|
|
* block runtime suspend here, during the prepare phase, and allow
|
|
* it again during the complete phase.
|
|
*/
|
|
pm_runtime_get_noresume(dev);
|
|
|
|
device_lock(dev);
|
|
|
|
dev->power.wakeup_path = device_may_wakeup(dev);
|
|
|
|
if (dev->power.no_pm_callbacks) {
|
|
ret = 1; /* Let device go direct_complete */
|
|
goto unlock;
|
|
}
|
|
|
|
if (dev->pm_domain)
|
|
callback = dev->pm_domain->ops.prepare;
|
|
else if (dev->type && dev->type->pm)
|
|
callback = dev->type->pm->prepare;
|
|
else if (dev->class && dev->class->pm)
|
|
callback = dev->class->pm->prepare;
|
|
else if (dev->bus && dev->bus->pm)
|
|
callback = dev->bus->pm->prepare;
|
|
|
|
if (!callback && dev->driver && dev->driver->pm)
|
|
callback = dev->driver->pm->prepare;
|
|
|
|
if (callback)
|
|
ret = callback(dev);
|
|
|
|
unlock:
|
|
device_unlock(dev);
|
|
|
|
if (ret < 0) {
|
|
suspend_report_result(callback, ret);
|
|
pm_runtime_put(dev);
|
|
return ret;
|
|
}
|
|
/*
|
|
* A positive return value from ->prepare() means "this device appears
|
|
* to be runtime-suspended and its state is fine, so if it really is
|
|
* runtime-suspended, you can leave it in that state provided that you
|
|
* will do the same thing with all of its descendants". This only
|
|
* applies to suspend transitions, however.
|
|
*/
|
|
spin_lock_irq(&dev->power.lock);
|
|
dev->power.direct_complete = ret > 0 && state.event == PM_EVENT_SUSPEND;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
int dpm_prepare(pm_message_t state)
|
|
{
|
|
int error = 0;
|
|
|
|
trace_suspend_resume(TPS("dpm_prepare"), state.event, true);
|
|
might_sleep();
|
|
|
|
/*
|
|
* Give a chance for the known devices to complete their probes, before
|
|
* disable probing of devices. This sync point is important at least
|
|
* at boot time + hibernation restore.
|
|
*/
|
|
wait_for_device_probe();
|
|
/*
|
|
* It is unsafe if probing of devices will happen during suspend or
|
|
* hibernation and system behavior will be unpredictable in this case.
|
|
* So, let's prohibit device's probing here and defer their probes
|
|
* instead. The normal behavior will be restored in dpm_complete().
|
|
*/
|
|
device_block_probing();
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
while (!list_empty(&dpm_list)) {
|
|
struct device *dev = to_device(dpm_list.next);
|
|
|
|
get_device(dev);
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
trace_device_pm_callback_start(dev, "", state.event);
|
|
error = device_prepare(dev, state);
|
|
trace_device_pm_callback_end(dev, error);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
if (error) {
|
|
if (error == -EAGAIN) {
|
|
put_device(dev);
|
|
error = 0;
|
|
continue;
|
|
}
|
|
printk(KERN_INFO "PM: Device %s not prepared "
|
|
"for power transition: code %d\n",
|
|
dev_name(dev), error);
|
|
put_device(dev);
|
|
break;
|
|
}
|
|
dev->power.is_prepared = true;
|
|
if (!list_empty(&dev->power.entry))
|
|
list_move_tail(&dev->power.entry, &dpm_prepared_list);
|
|
put_device(dev);
|
|
}
|
|
mutex_unlock(&dpm_list_mtx);
|
|
trace_suspend_resume(TPS("dpm_prepare"), state.event, false);
|
|
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;
|
|
|
|
error = dpm_prepare(state);
|
|
if (error) {
|
|
suspend_stats.failed_prepare++;
|
|
dpm_save_failed_step(SUSPEND_PREPARE);
|
|
} else
|
|
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.
|
|
*/
|
|
int device_pm_wait_for_dev(struct device *subordinate, struct device *dev)
|
|
{
|
|
dpm_wait(dev, subordinate->power.async_suspend);
|
|
return async_error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_pm_wait_for_dev);
|
|
|
|
/**
|
|
* dpm_for_each_dev - device iterator.
|
|
* @data: data for the callback.
|
|
* @fn: function to be called for each device.
|
|
*
|
|
* Iterate over devices in dpm_list, and call @fn for each device,
|
|
* passing it @data.
|
|
*/
|
|
void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *))
|
|
{
|
|
struct device *dev;
|
|
|
|
if (!fn)
|
|
return;
|
|
|
|
device_pm_lock();
|
|
list_for_each_entry(dev, &dpm_list, power.entry)
|
|
fn(dev, data);
|
|
device_pm_unlock();
|
|
}
|
|
EXPORT_SYMBOL_GPL(dpm_for_each_dev);
|
|
|
|
static bool pm_ops_is_empty(const struct dev_pm_ops *ops)
|
|
{
|
|
if (!ops)
|
|
return true;
|
|
|
|
return !ops->prepare &&
|
|
!ops->suspend &&
|
|
!ops->suspend_late &&
|
|
!ops->suspend_noirq &&
|
|
!ops->resume_noirq &&
|
|
!ops->resume_early &&
|
|
!ops->resume &&
|
|
!ops->complete;
|
|
}
|
|
|
|
void device_pm_check_callbacks(struct device *dev)
|
|
{
|
|
spin_lock_irq(&dev->power.lock);
|
|
dev->power.no_pm_callbacks =
|
|
(!dev->bus || pm_ops_is_empty(dev->bus->pm)) &&
|
|
(!dev->class || pm_ops_is_empty(dev->class->pm)) &&
|
|
(!dev->type || pm_ops_is_empty(dev->type->pm)) &&
|
|
(!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) &&
|
|
(!dev->driver || pm_ops_is_empty(dev->driver->pm));
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|