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linux_dsm_epyc7002/include/linux/pm.h
Rafael J. Wysocki aae4518b31 PM / sleep: Mechanism to avoid resuming runtime-suspended devices unnecessarily 
Currently, some subsystems (e.g. PCI and the ACPI PM domain) have to
resume all runtime-suspended devices during system suspend, mostly
because those devices may need to be reprogrammed due to different
wakeup settings for system sleep and for runtime PM.

For some devices, though, it's OK to remain in runtime suspend
throughout a complete system suspend/resume cycle (if the device was in
runtime suspend at the start of the cycle).  We would like to do this
whenever possible, to avoid the overhead of extra power-up and power-down
events.

However, problems may arise because the device's descendants may require
it to be at full power at various points during the cycle.  Therefore the
most straightforward way to do this safely is if the device and all its
descendants can remain runtime suspended until the complete stage of
system resume.

To this end, introduce a new device PM flag, power.direct_complete
and modify the PM core to use that flag as follows.

If the ->prepare() callback of a device returns a positive number,
the PM core will regard that as an indication that it may leave the
device runtime-suspended.  It will then check if the system power
transition in progress is a suspend (and not hibernation in particular)
and if the device is, indeed, runtime-suspended.  In that case, the PM
core will set the device's power.direct_complete flag.  Otherwise it
will clear power.direct_complete for the device and it also will later
clear it for the device's parent (if there's one).

Next, the PM core will not invoke the ->suspend() ->suspend_late(),
->suspend_irq(), ->resume_irq(), ->resume_early(), or ->resume()
callbacks for all devices having power.direct_complete set.  It
will invoke their ->complete() callbacks, however, and those
callbacks are then responsible for resuming the devices as
appropriate, if necessary.  For example, in some cases they may
need to queue up runtime resume requests for the devices using
pm_request_resume().

Changelog partly based on an Alan Stern's description of the idea
(http://marc.info/?l=linux-pm&m=139940466625569&w=2).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
2014-05-16 23:15:44 +02:00

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/*
* pm.h - Power management interface
*
* Copyright (C) 2000 Andrew Henroid
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _LINUX_PM_H
#define _LINUX_PM_H
#include <linux/list.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/timer.h>
#include <linux/completion.h>
/*
* Callbacks for platform drivers to implement.
*/
extern void (*pm_power_off)(void);
extern void (*pm_power_off_prepare)(void);
struct device; /* we have a circular dep with device.h */
#ifdef CONFIG_VT_CONSOLE_SLEEP
extern void pm_vt_switch_required(struct device *dev, bool required);
extern void pm_vt_switch_unregister(struct device *dev);
#else
static inline void pm_vt_switch_required(struct device *dev, bool required)
{
}
static inline void pm_vt_switch_unregister(struct device *dev)
{
}
#endif /* CONFIG_VT_CONSOLE_SLEEP */
/*
* Device power management
*/
struct device;
#ifdef CONFIG_PM
extern const char power_group_name[]; /* = "power" */
#else
#define power_group_name NULL
#endif
typedef struct pm_message {
int event;
} pm_message_t;
/**
* struct dev_pm_ops - device PM callbacks
*
* Several device power state transitions are externally visible, affecting
* the state of pending I/O queues and (for drivers that touch hardware)
* interrupts, wakeups, DMA, and other hardware state. There may also be
* internal transitions to various low-power modes which are transparent
* to the rest of the driver stack (such as a driver that's ON gating off
* clocks which are not in active use).
*
* The externally visible transitions are handled with the help of callbacks
* included in this structure in such a way that two levels of callbacks are
* involved. First, the PM core executes callbacks provided by PM domains,
* device types, classes and bus types. They are the subsystem-level callbacks
* supposed to execute callbacks provided by device drivers, although they may
* choose not to do that. If the driver callbacks are executed, they have to
* collaborate with the subsystem-level callbacks to achieve the goals
* appropriate for the given system transition, given transition phase and the
* subsystem the device belongs to.
*
* @prepare: The principal role of this callback is to prevent new children of
* the device from being registered after it has returned (the driver's
* subsystem and generally the rest of the kernel is supposed to prevent
* new calls to the probe method from being made too once @prepare() has
* succeeded). If @prepare() detects a situation it cannot handle (e.g.
* registration of a child already in progress), it may return -EAGAIN, so
* that the PM core can execute it once again (e.g. after a new child has
* been registered) to recover from the race condition.
* This method is executed for all kinds of suspend transitions and is
* followed by one of the suspend callbacks: @suspend(), @freeze(), or
* @poweroff(). If the transition is a suspend to memory or standby (that
* is, not related to hibernation), the return value of @prepare() may be
* used to indicate to the PM core to leave the device in runtime suspend
* if applicable. Namely, if @prepare() returns a positive number, the PM
* core will understand that as a declaration that the device appears to be
* runtime-suspended and it may be left in that state during the entire
* transition and during the subsequent resume if all of its descendants
* are left in runtime suspend too. If that happens, @complete() will be
* executed directly after @prepare() and it must ensure the proper
* functioning of the device after the system resume.
* The PM core executes subsystem-level @prepare() for all devices before
* starting to invoke suspend callbacks for any of them, so generally
* devices may be assumed to be functional or to respond to runtime resume
* requests while @prepare() is being executed. However, device drivers
* may NOT assume anything about the availability of user space at that
* time and it is NOT valid to request firmware from within @prepare()
* (it's too late to do that). It also is NOT valid to allocate
* substantial amounts of memory from @prepare() in the GFP_KERNEL mode.
* [To work around these limitations, drivers may register suspend and
* hibernation notifiers to be executed before the freezing of tasks.]
*
* @complete: Undo the changes made by @prepare(). This method is executed for
* all kinds of resume transitions, following one of the resume callbacks:
* @resume(), @thaw(), @restore(). Also called if the state transition
* fails before the driver's suspend callback: @suspend(), @freeze() or
* @poweroff(), can be executed (e.g. if the suspend callback fails for one
* of the other devices that the PM core has unsuccessfully attempted to
* suspend earlier).
* The PM core executes subsystem-level @complete() after it has executed
* the appropriate resume callbacks for all devices. If the corresponding
* @prepare() at the beginning of the suspend transition returned a
* positive number and the device was left in runtime suspend (without
* executing any suspend and resume callbacks for it), @complete() will be
* the only callback executed for the device during resume. In that case,
* @complete() must be prepared to do whatever is necessary to ensure the
* proper functioning of the device after the system resume. To this end,
* @complete() can check the power.direct_complete flag of the device to
* learn whether (unset) or not (set) the previous suspend and resume
* callbacks have been executed for it.
*
* @suspend: Executed before putting the system into a sleep state in which the
* contents of main memory are preserved. The exact action to perform
* depends on the device's subsystem (PM domain, device type, class or bus
* type), but generally the device must be quiescent after subsystem-level
* @suspend() has returned, so that it doesn't do any I/O or DMA.
* Subsystem-level @suspend() is executed for all devices after invoking
* subsystem-level @prepare() for all of them.
*
* @suspend_late: Continue operations started by @suspend(). For a number of
* devices @suspend_late() may point to the same callback routine as the
* runtime suspend callback.
*
* @resume: Executed after waking the system up from a sleep state in which the
* contents of main memory were preserved. The exact action to perform
* depends on the device's subsystem, but generally the driver is expected
* to start working again, responding to hardware events and software
* requests (the device itself may be left in a low-power state, waiting
* for a runtime resume to occur). The state of the device at the time its
* driver's @resume() callback is run depends on the platform and subsystem
* the device belongs to. On most platforms, there are no restrictions on
* availability of resources like clocks during @resume().
* Subsystem-level @resume() is executed for all devices after invoking
* subsystem-level @resume_noirq() for all of them.
*
* @resume_early: Prepare to execute @resume(). For a number of devices
* @resume_early() may point to the same callback routine as the runtime
* resume callback.
*
* @freeze: Hibernation-specific, executed before creating a hibernation image.
* Analogous to @suspend(), but it should not enable the device to signal
* wakeup events or change its power state. The majority of subsystems
* (with the notable exception of the PCI bus type) expect the driver-level
* @freeze() to save the device settings in memory to be used by @restore()
* during the subsequent resume from hibernation.
* Subsystem-level @freeze() is executed for all devices after invoking
* subsystem-level @prepare() for all of them.
*
* @freeze_late: Continue operations started by @freeze(). Analogous to
* @suspend_late(), but it should not enable the device to signal wakeup
* events or change its power state.
*
* @thaw: Hibernation-specific, executed after creating a hibernation image OR
* if the creation of an image has failed. Also executed after a failing
* attempt to restore the contents of main memory from such an image.
* Undo the changes made by the preceding @freeze(), so the device can be
* operated in the same way as immediately before the call to @freeze().
* Subsystem-level @thaw() is executed for all devices after invoking
* subsystem-level @thaw_noirq() for all of them. It also may be executed
* directly after @freeze() in case of a transition error.
*
* @thaw_early: Prepare to execute @thaw(). Undo the changes made by the
* preceding @freeze_late().
*
* @poweroff: Hibernation-specific, executed after saving a hibernation image.
* Analogous to @suspend(), but it need not save the device's settings in
* memory.
* Subsystem-level @poweroff() is executed for all devices after invoking
* subsystem-level @prepare() for all of them.
*
* @poweroff_late: Continue operations started by @poweroff(). Analogous to
* @suspend_late(), but it need not save the device's settings in memory.
*
* @restore: Hibernation-specific, executed after restoring the contents of main
* memory from a hibernation image, analogous to @resume().
*
* @restore_early: Prepare to execute @restore(), analogous to @resume_early().
*
* @suspend_noirq: Complete the actions started by @suspend(). Carry out any
* additional operations required for suspending the device that might be
* racing with its driver's interrupt handler, which is guaranteed not to
* run while @suspend_noirq() is being executed.
* It generally is expected that the device will be in a low-power state
* (appropriate for the target system sleep state) after subsystem-level
* @suspend_noirq() has returned successfully. If the device can generate
* system wakeup signals and is enabled to wake up the system, it should be
* configured to do so at that time. However, depending on the platform
* and device's subsystem, @suspend() or @suspend_late() may be allowed to
* put the device into the low-power state and configure it to generate
* wakeup signals, in which case it generally is not necessary to define
* @suspend_noirq().
*
* @resume_noirq: Prepare for the execution of @resume() by carrying out any
* operations required for resuming the device that might be racing with
* its driver's interrupt handler, which is guaranteed not to run while
* @resume_noirq() is being executed.
*
* @freeze_noirq: Complete the actions started by @freeze(). Carry out any
* additional operations required for freezing the device that might be
* racing with its driver's interrupt handler, which is guaranteed not to
* run while @freeze_noirq() is being executed.
* The power state of the device should not be changed by either @freeze(),
* or @freeze_late(), or @freeze_noirq() and it should not be configured to
* signal system wakeup by any of these callbacks.
*
* @thaw_noirq: Prepare for the execution of @thaw() by carrying out any
* operations required for thawing the device that might be racing with its
* driver's interrupt handler, which is guaranteed not to run while
* @thaw_noirq() is being executed.
*
* @poweroff_noirq: Complete the actions started by @poweroff(). Analogous to
* @suspend_noirq(), but it need not save the device's settings in memory.
*
* @restore_noirq: Prepare for the execution of @restore() by carrying out any
* operations required for thawing the device that might be racing with its
* driver's interrupt handler, which is guaranteed not to run while
* @restore_noirq() is being executed. Analogous to @resume_noirq().
*
* All of the above callbacks, except for @complete(), return error codes.
* However, the error codes returned by the resume operations, @resume(),
* @thaw(), @restore(), @resume_noirq(), @thaw_noirq(), and @restore_noirq(), do
* not cause the PM core to abort the resume transition during which they are
* returned. The error codes returned in those cases are only printed by the PM
* core to the system logs for debugging purposes. Still, it is recommended
* that drivers only return error codes from their resume methods in case of an
* unrecoverable failure (i.e. when the device being handled refuses to resume
* and becomes unusable) to allow us to modify the PM core in the future, so
* that it can avoid attempting to handle devices that failed to resume and
* their children.
*
* It is allowed to unregister devices while the above callbacks are being
* executed. However, a callback routine must NOT try to unregister the device
* it was called for, although it may unregister children of that device (for
* example, if it detects that a child was unplugged while the system was
* asleep).
*
* Refer to Documentation/power/devices.txt for more information about the role
* of the above callbacks in the system suspend process.
*
* There also are callbacks related to runtime power management of devices.
* Again, these callbacks are executed by the PM core only for subsystems
* (PM domains, device types, classes and bus types) and the subsystem-level
* callbacks are supposed to invoke the driver callbacks. Moreover, the exact
* actions to be performed by a device driver's callbacks generally depend on
* the platform and subsystem the device belongs to.
*
* @runtime_suspend: Prepare the device for a condition in which it won't be
* able to communicate with the CPU(s) and RAM due to power management.
* This need not mean that the device should be put into a low-power state.
* For example, if the device is behind a link which is about to be turned
* off, the device may remain at full power. If the device does go to low
* power and is capable of generating runtime wakeup events, remote wakeup
* (i.e., a hardware mechanism allowing the device to request a change of
* its power state via an interrupt) should be enabled for it.
*
* @runtime_resume: Put the device into the fully active state in response to a
* wakeup event generated by hardware or at the request of software. If
* necessary, put the device into the full-power state and restore its
* registers, so that it is fully operational.
*
* @runtime_idle: Device appears to be inactive and it might be put into a
* low-power state if all of the necessary conditions are satisfied.
* Check these conditions, and return 0 if it's appropriate to let the PM
* core queue a suspend request for the device.
*
* Refer to Documentation/power/runtime_pm.txt for more information about the
* role of the above callbacks in device runtime power management.
*
*/
struct dev_pm_ops {
int (*prepare)(struct device *dev);
void (*complete)(struct device *dev);
int (*suspend)(struct device *dev);
int (*resume)(struct device *dev);
int (*freeze)(struct device *dev);
int (*thaw)(struct device *dev);
int (*poweroff)(struct device *dev);
int (*restore)(struct device *dev);
int (*suspend_late)(struct device *dev);
int (*resume_early)(struct device *dev);
int (*freeze_late)(struct device *dev);
int (*thaw_early)(struct device *dev);
int (*poweroff_late)(struct device *dev);
int (*restore_early)(struct device *dev);
int (*suspend_noirq)(struct device *dev);
int (*resume_noirq)(struct device *dev);
int (*freeze_noirq)(struct device *dev);
int (*thaw_noirq)(struct device *dev);
int (*poweroff_noirq)(struct device *dev);
int (*restore_noirq)(struct device *dev);
int (*runtime_suspend)(struct device *dev);
int (*runtime_resume)(struct device *dev);
int (*runtime_idle)(struct device *dev);
};
#ifdef CONFIG_PM_SLEEP
#define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
.suspend = suspend_fn, \
.resume = resume_fn, \
.freeze = suspend_fn, \
.thaw = resume_fn, \
.poweroff = suspend_fn, \
.restore = resume_fn,
#else
#define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
#endif
#ifdef CONFIG_PM_SLEEP
#define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
.suspend_late = suspend_fn, \
.resume_early = resume_fn, \
.freeze_late = suspend_fn, \
.thaw_early = resume_fn, \
.poweroff_late = suspend_fn, \
.restore_early = resume_fn,
#else
#define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
#endif
#ifdef CONFIG_PM_RUNTIME
#define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
.runtime_suspend = suspend_fn, \
.runtime_resume = resume_fn, \
.runtime_idle = idle_fn,
#else
#define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn)
#endif
#ifdef CONFIG_PM
#define SET_PM_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
.runtime_suspend = suspend_fn, \
.runtime_resume = resume_fn, \
.runtime_idle = idle_fn,
#else
#define SET_PM_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn)
#endif
/*
* Use this if you want to use the same suspend and resume callbacks for suspend
* to RAM and hibernation.
*/
#define SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
const struct dev_pm_ops name = { \
SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
}
/*
* Use this for defining a set of PM operations to be used in all situations
* (system suspend, hibernation or runtime PM).
* NOTE: In general, system suspend callbacks, .suspend() and .resume(), should
* be different from the corresponding runtime PM callbacks, .runtime_suspend(),
* and .runtime_resume(), because .runtime_suspend() always works on an already
* quiescent device, while .suspend() should assume that the device may be doing
* something when it is called (it should ensure that the device will be
* quiescent after it has returned). Therefore it's better to point the "late"
* suspend and "early" resume callback pointers, .suspend_late() and
* .resume_early(), to the same routines as .runtime_suspend() and
* .runtime_resume(), respectively (and analogously for hibernation).
*/
#define UNIVERSAL_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
const struct dev_pm_ops name = { \
SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
}
/**
* PM_EVENT_ messages
*
* The following PM_EVENT_ messages are defined for the internal use of the PM
* core, in order to provide a mechanism allowing the high level suspend and
* hibernation code to convey the necessary information to the device PM core
* code:
*
* ON No transition.
*
* FREEZE System is going to hibernate, call ->prepare() and ->freeze()
* for all devices.
*
* SUSPEND System is going to suspend, call ->prepare() and ->suspend()
* for all devices.
*
* HIBERNATE Hibernation image has been saved, call ->prepare() and
* ->poweroff() for all devices.
*
* QUIESCE Contents of main memory are going to be restored from a (loaded)
* hibernation image, call ->prepare() and ->freeze() for all
* devices.
*
* RESUME System is resuming, call ->resume() and ->complete() for all
* devices.
*
* THAW Hibernation image has been created, call ->thaw() and
* ->complete() for all devices.
*
* RESTORE Contents of main memory have been restored from a hibernation
* image, call ->restore() and ->complete() for all devices.
*
* RECOVER Creation of a hibernation image or restoration of the main
* memory contents from a hibernation image has failed, call
* ->thaw() and ->complete() for all devices.
*
* The following PM_EVENT_ messages are defined for internal use by
* kernel subsystems. They are never issued by the PM core.
*
* USER_SUSPEND Manual selective suspend was issued by userspace.
*
* USER_RESUME Manual selective resume was issued by userspace.
*
* REMOTE_WAKEUP Remote-wakeup request was received from the device.
*
* AUTO_SUSPEND Automatic (device idle) runtime suspend was
* initiated by the subsystem.
*
* AUTO_RESUME Automatic (device needed) runtime resume was
* requested by a driver.
*/
#define PM_EVENT_INVALID (-1)
#define PM_EVENT_ON 0x0000
#define PM_EVENT_FREEZE 0x0001
#define PM_EVENT_SUSPEND 0x0002
#define PM_EVENT_HIBERNATE 0x0004
#define PM_EVENT_QUIESCE 0x0008
#define PM_EVENT_RESUME 0x0010
#define PM_EVENT_THAW 0x0020
#define PM_EVENT_RESTORE 0x0040
#define PM_EVENT_RECOVER 0x0080
#define PM_EVENT_USER 0x0100
#define PM_EVENT_REMOTE 0x0200
#define PM_EVENT_AUTO 0x0400
#define PM_EVENT_SLEEP (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
#define PM_EVENT_USER_SUSPEND (PM_EVENT_USER | PM_EVENT_SUSPEND)
#define PM_EVENT_USER_RESUME (PM_EVENT_USER | PM_EVENT_RESUME)
#define PM_EVENT_REMOTE_RESUME (PM_EVENT_REMOTE | PM_EVENT_RESUME)
#define PM_EVENT_AUTO_SUSPEND (PM_EVENT_AUTO | PM_EVENT_SUSPEND)
#define PM_EVENT_AUTO_RESUME (PM_EVENT_AUTO | PM_EVENT_RESUME)
#define PMSG_INVALID ((struct pm_message){ .event = PM_EVENT_INVALID, })
#define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
#define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
#define PMSG_QUIESCE ((struct pm_message){ .event = PM_EVENT_QUIESCE, })
#define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
#define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
#define PMSG_RESUME ((struct pm_message){ .event = PM_EVENT_RESUME, })
#define PMSG_THAW ((struct pm_message){ .event = PM_EVENT_THAW, })
#define PMSG_RESTORE ((struct pm_message){ .event = PM_EVENT_RESTORE, })
#define PMSG_RECOVER ((struct pm_message){ .event = PM_EVENT_RECOVER, })
#define PMSG_USER_SUSPEND ((struct pm_message) \
{ .event = PM_EVENT_USER_SUSPEND, })
#define PMSG_USER_RESUME ((struct pm_message) \
{ .event = PM_EVENT_USER_RESUME, })
#define PMSG_REMOTE_RESUME ((struct pm_message) \
{ .event = PM_EVENT_REMOTE_RESUME, })
#define PMSG_AUTO_SUSPEND ((struct pm_message) \
{ .event = PM_EVENT_AUTO_SUSPEND, })
#define PMSG_AUTO_RESUME ((struct pm_message) \
{ .event = PM_EVENT_AUTO_RESUME, })
#define PMSG_IS_AUTO(msg) (((msg).event & PM_EVENT_AUTO) != 0)
/**
* Device run-time power management status.
*
* These status labels are used internally by the PM core to indicate the
* current status of a device with respect to the PM core operations. They do
* not reflect the actual power state of the device or its status as seen by the
* driver.
*
* RPM_ACTIVE Device is fully operational. Indicates that the device
* bus type's ->runtime_resume() callback has completed
* successfully.
*
* RPM_SUSPENDED Device bus type's ->runtime_suspend() callback has
* completed successfully. The device is regarded as
* suspended.
*
* RPM_RESUMING Device bus type's ->runtime_resume() callback is being
* executed.
*
* RPM_SUSPENDING Device bus type's ->runtime_suspend() callback is being
* executed.
*/
enum rpm_status {
RPM_ACTIVE = 0,
RPM_RESUMING,
RPM_SUSPENDED,
RPM_SUSPENDING,
};
/**
* Device run-time power management request types.
*
* RPM_REQ_NONE Do nothing.
*
* RPM_REQ_IDLE Run the device bus type's ->runtime_idle() callback
*
* RPM_REQ_SUSPEND Run the device bus type's ->runtime_suspend() callback
*
* RPM_REQ_AUTOSUSPEND Same as RPM_REQ_SUSPEND, but not until the device has
* been inactive for as long as power.autosuspend_delay
*
* RPM_REQ_RESUME Run the device bus type's ->runtime_resume() callback
*/
enum rpm_request {
RPM_REQ_NONE = 0,
RPM_REQ_IDLE,
RPM_REQ_SUSPEND,
RPM_REQ_AUTOSUSPEND,
RPM_REQ_RESUME,
};
struct wakeup_source;
struct pm_domain_data {
struct list_head list_node;
struct device *dev;
};
struct pm_subsys_data {
spinlock_t lock;
unsigned int refcount;
#ifdef CONFIG_PM_CLK
struct list_head clock_list;
#endif
#ifdef CONFIG_PM_GENERIC_DOMAINS
struct pm_domain_data *domain_data;
#endif
};
struct dev_pm_info {
pm_message_t power_state;
unsigned int can_wakeup:1;
unsigned int async_suspend:1;
bool is_prepared:1; /* Owned by the PM core */
bool is_suspended:1; /* Ditto */
bool is_noirq_suspended:1;
bool is_late_suspended:1;
bool ignore_children:1;
bool early_init:1; /* Owned by the PM core */
bool direct_complete:1; /* Owned by the PM core */
spinlock_t lock;
#ifdef CONFIG_PM_SLEEP
struct list_head entry;
struct completion completion;
struct wakeup_source *wakeup;
bool wakeup_path:1;
bool syscore:1;
#else
unsigned int should_wakeup:1;
#endif
#ifdef CONFIG_PM_RUNTIME
struct timer_list suspend_timer;
unsigned long timer_expires;
struct work_struct work;
wait_queue_head_t wait_queue;
atomic_t usage_count;
atomic_t child_count;
unsigned int disable_depth:3;
unsigned int idle_notification:1;
unsigned int request_pending:1;
unsigned int deferred_resume:1;
unsigned int run_wake:1;
unsigned int runtime_auto:1;
unsigned int no_callbacks:1;
unsigned int irq_safe:1;
unsigned int use_autosuspend:1;
unsigned int timer_autosuspends:1;
unsigned int memalloc_noio:1;
enum rpm_request request;
enum rpm_status runtime_status;
int runtime_error;
int autosuspend_delay;
unsigned long last_busy;
unsigned long active_jiffies;
unsigned long suspended_jiffies;
unsigned long accounting_timestamp;
#endif
struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */
void (*set_latency_tolerance)(struct device *, s32);
struct dev_pm_qos *qos;
};
extern void update_pm_runtime_accounting(struct device *dev);
extern int dev_pm_get_subsys_data(struct device *dev);
extern int dev_pm_put_subsys_data(struct device *dev);
/*
* Power domains provide callbacks that are executed during system suspend,
* hibernation, system resume and during runtime PM transitions along with
* subsystem-level and driver-level callbacks.
*/
struct dev_pm_domain {
struct dev_pm_ops ops;
};
/*
* The PM_EVENT_ messages are also used by drivers implementing the legacy
* suspend framework, based on the ->suspend() and ->resume() callbacks common
* for suspend and hibernation transitions, according to the rules below.
*/
/* Necessary, because several drivers use PM_EVENT_PRETHAW */
#define PM_EVENT_PRETHAW PM_EVENT_QUIESCE
/*
* One transition is triggered by resume(), after a suspend() call; the
* message is implicit:
*
* ON Driver starts working again, responding to hardware events
* and software requests. The hardware may have gone through
* a power-off reset, or it may have maintained state from the
* previous suspend() which the driver will rely on while
* resuming. On most platforms, there are no restrictions on
* availability of resources like clocks during resume().
*
* Other transitions are triggered by messages sent using suspend(). All
* these transitions quiesce the driver, so that I/O queues are inactive.
* That commonly entails turning off IRQs and DMA; there may be rules
* about how to quiesce that are specific to the bus or the device's type.
* (For example, network drivers mark the link state.) Other details may
* differ according to the message:
*
* SUSPEND Quiesce, enter a low power device state appropriate for
* the upcoming system state (such as PCI_D3hot), and enable
* wakeup events as appropriate.
*
* HIBERNATE Enter a low power device state appropriate for the hibernation
* state (eg. ACPI S4) and enable wakeup events as appropriate.
*
* FREEZE Quiesce operations so that a consistent image can be saved;
* but do NOT otherwise enter a low power device state, and do
* NOT emit system wakeup events.
*
* PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring
* the system from a snapshot taken after an earlier FREEZE.
* Some drivers will need to reset their hardware state instead
* of preserving it, to ensure that it's never mistaken for the
* state which that earlier snapshot had set up.
*
* A minimally power-aware driver treats all messages as SUSPEND, fully
* reinitializes its device during resume() -- whether or not it was reset
* during the suspend/resume cycle -- and can't issue wakeup events.
*
* More power-aware drivers may also use low power states at runtime as
* well as during system sleep states like PM_SUSPEND_STANDBY. They may
* be able to use wakeup events to exit from runtime low-power states,
* or from system low-power states such as standby or suspend-to-RAM.
*/
#ifdef CONFIG_PM_SLEEP
extern void device_pm_lock(void);
extern void dpm_resume_start(pm_message_t state);
extern void dpm_resume_end(pm_message_t state);
extern void dpm_resume(pm_message_t state);
extern void dpm_complete(pm_message_t state);
extern void device_pm_unlock(void);
extern int dpm_suspend_end(pm_message_t state);
extern int dpm_suspend_start(pm_message_t state);
extern int dpm_suspend(pm_message_t state);
extern int dpm_prepare(pm_message_t state);
extern void __suspend_report_result(const char *function, void *fn, int ret);
#define suspend_report_result(fn, ret) \
do { \
__suspend_report_result(__func__, fn, ret); \
} while (0)
extern int device_pm_wait_for_dev(struct device *sub, struct device *dev);
extern void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *));
extern int pm_generic_prepare(struct device *dev);
extern int pm_generic_suspend_late(struct device *dev);
extern int pm_generic_suspend_noirq(struct device *dev);
extern int pm_generic_suspend(struct device *dev);
extern int pm_generic_resume_early(struct device *dev);
extern int pm_generic_resume_noirq(struct device *dev);
extern int pm_generic_resume(struct device *dev);
extern int pm_generic_freeze_noirq(struct device *dev);
extern int pm_generic_freeze_late(struct device *dev);
extern int pm_generic_freeze(struct device *dev);
extern int pm_generic_thaw_noirq(struct device *dev);
extern int pm_generic_thaw_early(struct device *dev);
extern int pm_generic_thaw(struct device *dev);
extern int pm_generic_restore_noirq(struct device *dev);
extern int pm_generic_restore_early(struct device *dev);
extern int pm_generic_restore(struct device *dev);
extern int pm_generic_poweroff_noirq(struct device *dev);
extern int pm_generic_poweroff_late(struct device *dev);
extern int pm_generic_poweroff(struct device *dev);
extern void pm_generic_complete(struct device *dev);
#else /* !CONFIG_PM_SLEEP */
#define device_pm_lock() do {} while (0)
#define device_pm_unlock() do {} while (0)
static inline int dpm_suspend_start(pm_message_t state)
{
return 0;
}
#define suspend_report_result(fn, ret) do {} while (0)
static inline int device_pm_wait_for_dev(struct device *a, struct device *b)
{
return 0;
}
static inline void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *))
{
}
#define pm_generic_prepare NULL
#define pm_generic_suspend_late NULL
#define pm_generic_suspend_noirq NULL
#define pm_generic_suspend NULL
#define pm_generic_resume_early NULL
#define pm_generic_resume_noirq NULL
#define pm_generic_resume NULL
#define pm_generic_freeze_noirq NULL
#define pm_generic_freeze_late NULL
#define pm_generic_freeze NULL
#define pm_generic_thaw_noirq NULL
#define pm_generic_thaw_early NULL
#define pm_generic_thaw NULL
#define pm_generic_restore_noirq NULL
#define pm_generic_restore_early NULL
#define pm_generic_restore NULL
#define pm_generic_poweroff_noirq NULL
#define pm_generic_poweroff_late NULL
#define pm_generic_poweroff NULL
#define pm_generic_complete NULL
#endif /* !CONFIG_PM_SLEEP */
/* How to reorder dpm_list after device_move() */
enum dpm_order {
DPM_ORDER_NONE,
DPM_ORDER_DEV_AFTER_PARENT,
DPM_ORDER_PARENT_BEFORE_DEV,
DPM_ORDER_DEV_LAST,
};
#endif /* _LINUX_PM_H */
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