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![Li zeming](/assets/img/avatar_default.png)
Assignments from pointer variables of type (void *) do not require explicit type casts, so remove such type cases from the code in drivers/base/power/main.c where applicable. Signed-off-by: Li zeming <zeming@nfschina.com> [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2039 lines
50 KiB
C
2039 lines
50 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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* 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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#define pr_fmt(fmt) "PM: " fmt
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#define dev_fmt pr_fmt
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#include <linux/device.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/sched/debug.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/devfreq.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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#define list_for_each_entry_rcu_locked(pos, head, member) \
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list_for_each_entry_rcu(pos, head, member, \
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device_links_read_lock_held())
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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 const 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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/* Skip PM setup/initialization. */
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if (device_pm_not_required(dev))
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return;
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pr_debug("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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dev->power.in_dpm_list = true;
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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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if (device_pm_not_required(dev))
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return;
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pr_debug("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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dev->power.in_dpm_list = false;
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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("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("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("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, void *cb)
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{
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if (!pm_print_times_enabled)
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return 0;
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dev_info(dev, "calling %pS @ %i, parent: %s\n", cb,
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task_pid_nr(current),
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dev->parent ? dev_name(dev->parent) : "none");
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return ktime_get();
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}
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static void initcall_debug_report(struct device *dev, ktime_t calltime,
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void *cb, int error)
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{
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ktime_t rettime;
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if (!pm_print_times_enabled)
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return;
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rettime = ktime_get();
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dev_info(dev, "%pS returned %d after %Ld usecs\n", cb, error,
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(unsigned long long)ktime_us_delta(rettime, calltime));
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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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static void dpm_wait_for_suppliers(struct device *dev, bool async)
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{
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struct device_link *link;
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int idx;
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idx = device_links_read_lock();
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/*
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* If the supplier goes away right after we've checked the link to it,
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* we'll wait for its completion to change the state, but that's fine,
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* because the only things that will block as a result are the SRCU
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* callbacks freeing the link objects for the links in the list we're
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* walking.
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*/
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list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node)
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if (READ_ONCE(link->status) != DL_STATE_DORMANT)
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dpm_wait(link->supplier, async);
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device_links_read_unlock(idx);
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}
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static bool dpm_wait_for_superior(struct device *dev, bool async)
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{
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struct device *parent;
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/*
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* If the device is resumed asynchronously and the parent's callback
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* deletes both the device and the parent itself, the parent object may
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* be freed while this function is running, so avoid that by reference
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* counting the parent once more unless the device has been deleted
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* already (in which case return right away).
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*/
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mutex_lock(&dpm_list_mtx);
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if (!device_pm_initialized(dev)) {
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mutex_unlock(&dpm_list_mtx);
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return false;
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}
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parent = get_device(dev->parent);
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mutex_unlock(&dpm_list_mtx);
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dpm_wait(parent, async);
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put_device(parent);
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dpm_wait_for_suppliers(dev, async);
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/*
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* If the parent's callback has deleted the device, attempting to resume
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* it would be invalid, so avoid doing that then.
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*/
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return device_pm_initialized(dev);
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}
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static void dpm_wait_for_consumers(struct device *dev, bool async)
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{
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struct device_link *link;
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int idx;
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idx = device_links_read_lock();
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/*
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* The status of a device link can only be changed from "dormant" by a
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* probe, but that cannot happen during system suspend/resume. In
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* theory it can change to "dormant" at that time, but then it is
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* reasonable to wait for the target device anyway (eg. if it goes
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* away, it's better to wait for it to go away completely and then
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* continue instead of trying to continue in parallel with its
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* unregistration).
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*/
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list_for_each_entry_rcu_locked(link, &dev->links.consumers, s_node)
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if (READ_ONCE(link->status) != DL_STATE_DORMANT)
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dpm_wait(link->consumer, async);
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device_links_read_unlock(idx);
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}
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static void dpm_wait_for_subordinate(struct device *dev, bool async)
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{
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dpm_wait_for_children(dev, async);
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dpm_wait_for_consumers(dev, async);
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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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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, const char *info)
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{
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dev_dbg(dev, "%s%s%s driver flags: %x\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" : "", dev->power.driver_flags);
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}
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static void pm_dev_err(struct device *dev, pm_message_t state, const char *info,
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int error)
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{
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dev_err(dev, "failed to %s%s: error %d\n", pm_verb(state.event), info,
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error);
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}
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static void dpm_show_time(ktime_t starttime, pm_message_t state, int error,
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const 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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pm_pr_dbg("%s%s%s of devices %s after %ld.%03ld msecs\n",
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info ?: "", info ? " " : "", pm_verb(state.event),
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error ? "aborted" : "complete",
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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, const 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, cb);
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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(dev, cb, error);
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initcall_debug_report(dev, calltime, cb, error);
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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;
|
|
struct timer_list timer;
|
|
};
|
|
|
|
#define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \
|
|
struct dpm_watchdog wd
|
|
|
|
/**
|
|
* dpm_watchdog_handler - Driver suspend / resume watchdog handler.
|
|
* @t: The timer that PM watchdog depends on.
|
|
*
|
|
* Called when a driver has timed out suspending or resuming.
|
|
* There's not much we can do here to recover so panic() to
|
|
* capture a crash-dump in pstore.
|
|
*/
|
|
static void dpm_watchdog_handler(struct timer_list *t)
|
|
{
|
|
struct dpm_watchdog *wd = from_timer(wd, t, timer);
|
|
|
|
dev_emerg(wd->dev, "**** DPM device timeout ****\n");
|
|
show_stack(wd->tsk, NULL, KERN_EMERG);
|
|
panic("%s %s: unrecoverable failure\n",
|
|
dev_driver_string(wd->dev), dev_name(wd->dev));
|
|
}
|
|
|
|
/**
|
|
* dpm_watchdog_set - Enable pm watchdog for given device.
|
|
* @wd: Watchdog. Must be allocated on the stack.
|
|
* @dev: Device to handle.
|
|
*/
|
|
static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev)
|
|
{
|
|
struct timer_list *timer = &wd->timer;
|
|
|
|
wd->dev = dev;
|
|
wd->tsk = current;
|
|
|
|
timer_setup_on_stack(timer, dpm_watchdog_handler, 0);
|
|
/* use same timeout value for both suspend and resume */
|
|
timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT;
|
|
add_timer(timer);
|
|
}
|
|
|
|
/**
|
|
* dpm_watchdog_clear - Disable suspend/resume watchdog.
|
|
* @wd: Watchdog to disable.
|
|
*/
|
|
static void dpm_watchdog_clear(struct dpm_watchdog *wd)
|
|
{
|
|
struct timer_list *timer = &wd->timer;
|
|
|
|
del_timer_sync(timer);
|
|
destroy_timer_on_stack(timer);
|
|
}
|
|
#else
|
|
#define DECLARE_DPM_WATCHDOG_ON_STACK(wd)
|
|
#define dpm_watchdog_set(x, y)
|
|
#define dpm_watchdog_clear(x)
|
|
#endif
|
|
|
|
/*------------------------- Resume routines -------------------------*/
|
|
|
|
/**
|
|
* dev_pm_skip_resume - System-wide device resume optimization check.
|
|
* @dev: Target device.
|
|
*
|
|
* Return:
|
|
* - %false if the transition under way is RESTORE.
|
|
* - Return value of dev_pm_skip_suspend() if the transition under way is THAW.
|
|
* - The logical negation of %power.must_resume otherwise (that is, when the
|
|
* transition under way is RESUME).
|
|
*/
|
|
bool dev_pm_skip_resume(struct device *dev)
|
|
{
|
|
if (pm_transition.event == PM_EVENT_RESTORE)
|
|
return false;
|
|
|
|
if (pm_transition.event == PM_EVENT_THAW)
|
|
return dev_pm_skip_suspend(dev);
|
|
|
|
return !dev->power.must_resume;
|
|
}
|
|
|
|
/**
|
|
* device_resume_noirq - Execute a "noirq 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.
|
|
*
|
|
* The driver of @dev will not receive interrupts while this function is being
|
|
* executed.
|
|
*/
|
|
static int device_resume_noirq(struct device *dev, pm_message_t state, bool async)
|
|
{
|
|
pm_callback_t callback = NULL;
|
|
const char *info = NULL;
|
|
bool skip_resume;
|
|
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;
|
|
|
|
if (!dpm_wait_for_superior(dev, async))
|
|
goto Out;
|
|
|
|
skip_resume = dev_pm_skip_resume(dev);
|
|
/*
|
|
* If the driver callback is skipped below or by the middle layer
|
|
* callback and device_resume_early() also skips the driver callback for
|
|
* this device later, it needs to appear as "suspended" to PM-runtime,
|
|
* so change its status accordingly.
|
|
*
|
|
* Otherwise, the device is going to be resumed, so set its PM-runtime
|
|
* status to "active", but do that only if DPM_FLAG_SMART_SUSPEND is set
|
|
* to avoid confusing drivers that don't use it.
|
|
*/
|
|
if (skip_resume)
|
|
pm_runtime_set_suspended(dev);
|
|
else if (dev_pm_skip_suspend(dev))
|
|
pm_runtime_set_active(dev);
|
|
|
|
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)
|
|
goto Run;
|
|
|
|
if (skip_resume)
|
|
goto Skip;
|
|
|
|
if (dev->driver && dev->driver->pm) {
|
|
info = "noirq driver ";
|
|
callback = pm_noirq_op(dev->driver->pm, state);
|
|
}
|
|
|
|
Run:
|
|
error = dpm_run_callback(callback, dev, state, info);
|
|
|
|
Skip:
|
|
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 bool dpm_async_fn(struct device *dev, async_func_t func)
|
|
{
|
|
reinit_completion(&dev->power.completion);
|
|
|
|
if (is_async(dev)) {
|
|
get_device(dev);
|
|
async_schedule_dev(func, dev);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void async_resume_noirq(void *data, async_cookie_t cookie)
|
|
{
|
|
struct device *dev = data;
|
|
int error;
|
|
|
|
error = device_resume_noirq(dev, pm_transition, true);
|
|
if (error)
|
|
pm_dev_err(dev, pm_transition, " async", error);
|
|
|
|
put_device(dev);
|
|
}
|
|
|
|
static void dpm_noirq_resume_devices(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)
|
|
dpm_async_fn(dev, async_resume_noirq);
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
put_device(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
}
|
|
mutex_unlock(&dpm_list_mtx);
|
|
async_synchronize_full();
|
|
dpm_show_time(starttime, state, 0, "noirq");
|
|
trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false);
|
|
}
|
|
|
|
/**
|
|
* dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
|
|
* @state: PM transition of the system being carried out.
|
|
*
|
|
* Invoke the "noirq" resume callbacks for all devices in dpm_noirq_list and
|
|
* allow device drivers' interrupt handlers to be called.
|
|
*/
|
|
void dpm_resume_noirq(pm_message_t state)
|
|
{
|
|
dpm_noirq_resume_devices(state);
|
|
|
|
resume_device_irqs();
|
|
device_wakeup_disarm_wake_irqs();
|
|
}
|
|
|
|
/**
|
|
* device_resume_early - Execute an "early resume" callback for given device.
|
|
* @dev: Device to handle.
|
|
* @state: PM transition of the system being carried out.
|
|
* @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;
|
|
const 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;
|
|
|
|
if (!dpm_wait_for_superior(dev, async))
|
|
goto Out;
|
|
|
|
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)
|
|
goto Run;
|
|
|
|
if (dev_pm_skip_resume(dev))
|
|
goto Skip;
|
|
|
|
if (dev->driver && dev->driver->pm) {
|
|
info = "early driver ";
|
|
callback = pm_late_early_op(dev->driver->pm, state);
|
|
}
|
|
|
|
Run:
|
|
error = dpm_run_callback(callback, dev, state, info);
|
|
|
|
Skip:
|
|
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 = 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)
|
|
dpm_async_fn(dev, async_resume_early);
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
put_device(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
}
|
|
mutex_unlock(&dpm_list_mtx);
|
|
async_synchronize_full();
|
|
dpm_show_time(starttime, state, 0, "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;
|
|
const 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;
|
|
}
|
|
|
|
if (!dpm_wait_for_superior(dev, async))
|
|
goto Complete;
|
|
|
|
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 && dev->class->pm) {
|
|
info = "class ";
|
|
callback = pm_op(dev->class->pm, state);
|
|
goto Driver;
|
|
}
|
|
|
|
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 = 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)
|
|
dpm_async_fn(dev, async_resume);
|
|
|
|
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);
|
|
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
put_device(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
}
|
|
mutex_unlock(&dpm_list_mtx);
|
|
async_synchronize_full();
|
|
dpm_show_time(starttime, state, 0, NULL);
|
|
|
|
cpufreq_resume();
|
|
devfreq_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;
|
|
const char *info = NULL;
|
|
|
|
if (dev->power.syscore)
|
|
goto out;
|
|
|
|
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);
|
|
|
|
out:
|
|
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);
|
|
|
|
put_device(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
}
|
|
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;
|
|
}
|
|
|
|
static void dpm_superior_set_must_resume(struct device *dev)
|
|
{
|
|
struct device_link *link;
|
|
int idx;
|
|
|
|
if (dev->parent)
|
|
dev->parent->power.must_resume = true;
|
|
|
|
idx = device_links_read_lock();
|
|
|
|
list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node)
|
|
link->supplier->power.must_resume = true;
|
|
|
|
device_links_read_unlock(idx);
|
|
}
|
|
|
|
/**
|
|
* __device_suspend_noirq - Execute a "noirq 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;
|
|
const char *info = NULL;
|
|
int error = 0;
|
|
|
|
TRACE_DEVICE(dev);
|
|
TRACE_SUSPEND(0);
|
|
|
|
dpm_wait_for_subordinate(dev, async);
|
|
|
|
if (async_error)
|
|
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)
|
|
goto Run;
|
|
|
|
if (dev_pm_skip_suspend(dev))
|
|
goto Skip;
|
|
|
|
if (dev->driver && dev->driver->pm) {
|
|
info = "noirq driver ";
|
|
callback = pm_noirq_op(dev->driver->pm, state);
|
|
}
|
|
|
|
Run:
|
|
error = dpm_run_callback(callback, dev, state, info);
|
|
if (error) {
|
|
async_error = error;
|
|
goto Complete;
|
|
}
|
|
|
|
Skip:
|
|
dev->power.is_noirq_suspended = true;
|
|
|
|
/*
|
|
* Skipping the resume of devices that were in use right before the
|
|
* system suspend (as indicated by their PM-runtime usage counters)
|
|
* would be suboptimal. Also resume them if doing that is not allowed
|
|
* to be skipped.
|
|
*/
|
|
if (atomic_read(&dev->power.usage_count) > 1 ||
|
|
!(dev_pm_test_driver_flags(dev, DPM_FLAG_MAY_SKIP_RESUME) &&
|
|
dev->power.may_skip_resume))
|
|
dev->power.must_resume = true;
|
|
|
|
if (dev->power.must_resume)
|
|
dpm_superior_set_must_resume(dev);
|
|
|
|
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 = 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)
|
|
{
|
|
if (dpm_async_fn(dev, async_suspend_noirq))
|
|
return 0;
|
|
|
|
return __device_suspend_noirq(dev, pm_transition, false);
|
|
}
|
|
|
|
static int dpm_noirq_suspend_devices(pm_message_t state)
|
|
{
|
|
ktime_t starttime = ktime_get();
|
|
int error = 0;
|
|
|
|
trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true);
|
|
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));
|
|
} else if (!list_empty(&dev->power.entry)) {
|
|
list_move(&dev->power.entry, &dpm_noirq_list);
|
|
}
|
|
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
put_device(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
|
|
if (error || 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_show_time(starttime, state, error, "noirq");
|
|
trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices.
|
|
* @state: PM transition of the system being carried out.
|
|
*
|
|
* Prevent device drivers' interrupt handlers from being called and invoke
|
|
* "noirq" suspend callbacks for all non-sysdev devices.
|
|
*/
|
|
int dpm_suspend_noirq(pm_message_t state)
|
|
{
|
|
int ret;
|
|
|
|
device_wakeup_arm_wake_irqs();
|
|
suspend_device_irqs();
|
|
|
|
ret = dpm_noirq_suspend_devices(state);
|
|
if (ret)
|
|
dpm_resume_noirq(resume_event(state));
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void dpm_propagate_wakeup_to_parent(struct device *dev)
|
|
{
|
|
struct device *parent = dev->parent;
|
|
|
|
if (!parent)
|
|
return;
|
|
|
|
spin_lock_irq(&parent->power.lock);
|
|
|
|
if (device_wakeup_path(dev) && !parent->power.ignore_children)
|
|
parent->power.wakeup_path = true;
|
|
|
|
spin_unlock_irq(&parent->power.lock);
|
|
}
|
|
|
|
/**
|
|
* __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;
|
|
const char *info = NULL;
|
|
int error = 0;
|
|
|
|
TRACE_DEVICE(dev);
|
|
TRACE_SUSPEND(0);
|
|
|
|
__pm_runtime_disable(dev, false);
|
|
|
|
dpm_wait_for_subordinate(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)
|
|
goto Run;
|
|
|
|
if (dev_pm_skip_suspend(dev))
|
|
goto Skip;
|
|
|
|
if (dev->driver && dev->driver->pm) {
|
|
info = "late driver ";
|
|
callback = pm_late_early_op(dev->driver->pm, state);
|
|
}
|
|
|
|
Run:
|
|
error = dpm_run_callback(callback, dev, state, info);
|
|
if (error) {
|
|
async_error = error;
|
|
goto Complete;
|
|
}
|
|
dpm_propagate_wakeup_to_parent(dev);
|
|
|
|
Skip:
|
|
dev->power.is_late_suspended = true;
|
|
|
|
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 = 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)
|
|
{
|
|
if (dpm_async_fn(dev, async_suspend_late))
|
|
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);
|
|
wake_up_all_idle_cpus();
|
|
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));
|
|
}
|
|
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
put_device(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
|
|
if (error || 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));
|
|
}
|
|
dpm_show_time(starttime, state, error, "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)
|
|
{
|
|
ktime_t starttime = ktime_get();
|
|
int error;
|
|
|
|
error = dpm_suspend_late(state);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = dpm_suspend_noirq(state);
|
|
if (error)
|
|
dpm_resume_early(resume_event(state));
|
|
|
|
out:
|
|
dpm_show_time(starttime, state, error, "end");
|
|
return error;
|
|
}
|
|
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),
|
|
const char *info)
|
|
{
|
|
int error;
|
|
ktime_t calltime;
|
|
|
|
calltime = initcall_debug_start(dev, cb);
|
|
|
|
trace_device_pm_callback_start(dev, info, state.event);
|
|
error = cb(dev, state);
|
|
trace_device_pm_callback_end(dev, error);
|
|
suspend_report_result(dev, cb, error);
|
|
|
|
initcall_debug_report(dev, calltime, cb, error);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void dpm_clear_superiors_direct_complete(struct device *dev)
|
|
{
|
|
struct device_link *link;
|
|
int idx;
|
|
|
|
if (dev->parent) {
|
|
spin_lock_irq(&dev->parent->power.lock);
|
|
dev->parent->power.direct_complete = false;
|
|
spin_unlock_irq(&dev->parent->power.lock);
|
|
}
|
|
|
|
idx = device_links_read_lock();
|
|
|
|
list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node) {
|
|
spin_lock_irq(&link->supplier->power.lock);
|
|
link->supplier->power.direct_complete = false;
|
|
spin_unlock_irq(&link->supplier->power.lock);
|
|
}
|
|
|
|
device_links_read_unlock(idx);
|
|
}
|
|
|
|
/**
|
|
* __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;
|
|
const char *info = NULL;
|
|
int error = 0;
|
|
DECLARE_DPM_WATCHDOG_ON_STACK(wd);
|
|
|
|
TRACE_DEVICE(dev);
|
|
TRACE_SUSPEND(0);
|
|
|
|
dpm_wait_for_subordinate(dev, async);
|
|
|
|
if (async_error) {
|
|
dev->power.direct_complete = false;
|
|
goto Complete;
|
|
}
|
|
|
|
/*
|
|
* Wait for possible runtime PM transitions of the device in progress
|
|
* to complete and if there's a runtime resume request pending for it,
|
|
* resume it before proceeding with invoking the system-wide suspend
|
|
* callbacks for it.
|
|
*
|
|
* If the system-wide suspend callbacks below change the configuration
|
|
* of the device, they must disable runtime PM for it or otherwise
|
|
* ensure that its runtime-resume callbacks will not be confused by that
|
|
* change in case they are invoked going forward.
|
|
*/
|
|
pm_runtime_barrier(dev);
|
|
|
|
if (pm_wakeup_pending()) {
|
|
dev->power.direct_complete = false;
|
|
async_error = -EBUSY;
|
|
goto Complete;
|
|
}
|
|
|
|
if (dev->power.syscore)
|
|
goto Complete;
|
|
|
|
/* Avoid direct_complete to let wakeup_path propagate. */
|
|
if (device_may_wakeup(dev) || device_wakeup_path(dev))
|
|
dev->power.direct_complete = false;
|
|
|
|
if (dev->power.direct_complete) {
|
|
if (pm_runtime_status_suspended(dev)) {
|
|
pm_runtime_disable(dev);
|
|
if (pm_runtime_status_suspended(dev)) {
|
|
pm_dev_dbg(dev, state, "direct-complete ");
|
|
goto Complete;
|
|
}
|
|
|
|
pm_runtime_enable(dev);
|
|
}
|
|
dev->power.direct_complete = false;
|
|
}
|
|
|
|
dev->power.may_skip_resume = true;
|
|
dev->power.must_resume = !dev_pm_test_driver_flags(dev, DPM_FLAG_MAY_SKIP_RESUME);
|
|
|
|
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 && dev->class->pm) {
|
|
info = "class ";
|
|
callback = pm_op(dev->class->pm, state);
|
|
goto Run;
|
|
}
|
|
|
|
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) {
|
|
dev->power.is_suspended = true;
|
|
if (device_may_wakeup(dev))
|
|
dev->power.wakeup_path = true;
|
|
|
|
dpm_propagate_wakeup_to_parent(dev);
|
|
dpm_clear_superiors_direct_complete(dev);
|
|
}
|
|
|
|
device_unlock(dev);
|
|
dpm_watchdog_clear(&wd);
|
|
|
|
Complete:
|
|
if (error)
|
|
async_error = error;
|
|
|
|
complete_all(&dev->power.completion);
|
|
TRACE_SUSPEND(error);
|
|
return error;
|
|
}
|
|
|
|
static void async_suspend(void *data, async_cookie_t cookie)
|
|
{
|
|
struct device *dev = 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)
|
|
{
|
|
if (dpm_async_fn(dev, async_suspend))
|
|
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();
|
|
|
|
devfreq_suspend();
|
|
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));
|
|
} else if (!list_empty(&dev->power.entry)) {
|
|
list_move(&dev->power.entry, &dpm_suspended_list);
|
|
}
|
|
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
put_device(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
|
|
if (error || 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);
|
|
}
|
|
dpm_show_time(starttime, state, error, 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 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);
|
|
|
|
if (dev->power.syscore)
|
|
return 0;
|
|
|
|
device_lock(dev);
|
|
|
|
dev->power.wakeup_path = false;
|
|
|
|
if (dev->power.no_pm_callbacks)
|
|
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(dev, 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 = state.event == PM_EVENT_SUSPEND &&
|
|
(ret > 0 || dev->power.no_pm_callbacks) &&
|
|
!dev_pm_test_driver_flags(dev, DPM_FLAG_NO_DIRECT_COMPLETE);
|
|
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) && !error) {
|
|
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) {
|
|
dev->power.is_prepared = true;
|
|
if (!list_empty(&dev->power.entry))
|
|
list_move_tail(&dev->power.entry, &dpm_prepared_list);
|
|
} else if (error == -EAGAIN) {
|
|
error = 0;
|
|
} else {
|
|
dev_info(dev, "not prepared for power transition: code %d\n",
|
|
error);
|
|
}
|
|
|
|
mutex_unlock(&dpm_list_mtx);
|
|
|
|
put_device(dev);
|
|
|
|
mutex_lock(&dpm_list_mtx);
|
|
}
|
|
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)
|
|
{
|
|
ktime_t starttime = ktime_get();
|
|
int error;
|
|
|
|
error = dpm_prepare(state);
|
|
if (error) {
|
|
suspend_stats.failed_prepare++;
|
|
dpm_save_failed_step(SUSPEND_PREPARE);
|
|
} else
|
|
error = dpm_suspend(state);
|
|
dpm_show_time(starttime, state, error, "start");
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dpm_suspend_start);
|
|
|
|
void __suspend_report_result(const char *function, struct device *dev, void *fn, int ret)
|
|
{
|
|
if (ret)
|
|
dev_err(dev, "%s(): %pS 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.
|
|
* @subordinate: Device that needs to wait for @dev.
|
|
* @dev: Device to wait for.
|
|
*/
|
|
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)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
dev->power.no_pm_callbacks =
|
|
(!dev->bus || (pm_ops_is_empty(dev->bus->pm) &&
|
|
!dev->bus->suspend && !dev->bus->resume)) &&
|
|
(!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) &&
|
|
!dev->driver->suspend && !dev->driver->resume));
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
}
|
|
|
|
bool dev_pm_skip_suspend(struct device *dev)
|
|
{
|
|
return dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) &&
|
|
pm_runtime_status_suspended(dev);
|
|
}
|