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Merge branches 'pm-core' and 'pm-sleep'

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* pm-core:
  PM: runtime: Replace pm_runtime_callbacks_present()
  PM: runtime: clk: Fix clk_pm_runtime_get() error path
  PM: runtime: Make clear what we do when conditions are wrong in rpm_suspend()

* pm-sleep:
  PM: hibernate: Restrict writes to the resume device
  PM: hibernate: Split off snapshot dev option
  PM: hibernate: Incorporate concurrency handling
  PM: sleep: Helpful edits for devices.rst documentation
  Documentation: PM: sleep: Update driver flags documentation
  PM: sleep: core: Rename DPM_FLAG_LEAVE_SUSPENDED
  PM: sleep: core: Rename DPM_FLAG_NEVER_SKIP
  PM: sleep: core: Rename dev_pm_smart_suspend_and_suspended()
  PM: sleep: core: Rename dev_pm_may_skip_resume()
  PM: sleep: core: Rework the power.may_skip_resume handling
  PM: sleep: core: Do not skip callbacks in the resume phase
  PM: sleep: core: Fold functions into their callers
  PM: sleep: core: Simplify the SMART_SUSPEND flag handling
This commit is contained in:
Rafael J. Wysocki 2020-06-01 15:19:08 +02:00
commit be6018a44c
30 changed files with 389 additions and 439 deletions
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195
Documentation/driver-api/pm/devices.rst
View File

@ -349,7 +349,7 @@ the phases are: ``prepare``, ``suspend``, ``suspend_late``, ``suspend_noirq``.
PM core will skip the ``suspend``, ``suspend_late`` and
``suspend_noirq`` phases as well as all of the corresponding phases of
the subsequent device resume for all of these devices. In that case,
the ``->complete`` callback will be invoked directly after the
the ``->complete`` callback will be the next one invoked after the
``->prepare`` callback and is entirely responsible for putting the
device into a consistent state as appropriate.
@ -361,9 +361,9 @@ the phases are: ``prepare``, ``suspend``, ``suspend_late``, ``suspend_noirq``.
runtime PM disabled.
This feature also can be controlled by device drivers by using the
``DPM_FLAG_NEVER_SKIP`` and ``DPM_FLAG_SMART_PREPARE`` driver power
management flags. [Typically, they are set at the time the driver is
probed against the device in question by passing them to the
``DPM_FLAG_NO_DIRECT_COMPLETE`` and ``DPM_FLAG_SMART_PREPARE`` driver
power management flags. [Typically, they are set at the time the driver
is probed against the device in question by passing them to the
:c:func:`dev_pm_set_driver_flags` helper function.] If the first of
these flags is set, the PM core will not apply the direct-complete
procedure described above to the given device and, consequenty, to any
@ -383,11 +383,15 @@ the phases are: ``prepare``, ``suspend``, ``suspend_late``, ``suspend_noirq``.
``->suspend`` methods provided by subsystems (bus types and PM domains
in particular) must follow an additional rule regarding what can be done
to the devices before their drivers' ``->suspend`` methods are called.
Namely, they can only resume the devices from runtime suspend by
calling :c:func:`pm_runtime_resume` for them, if that is necessary, and
Namely, they may resume the devices from runtime suspend by
calling :c:func:`pm_runtime_resume` for them, if that is necessary, but
they must not update the state of the devices in any other way at that
time (in case the drivers need to resume the devices from runtime
suspend in their ``->suspend`` methods).
suspend in their ``->suspend`` methods). In fact, the PM core prevents
subsystems or drivers from putting devices into runtime suspend at
these times by calling :c:func:`pm_runtime_get_noresume` before issuing
the ``->prepare`` callback (and calling :c:func:`pm_runtime_put` after
issuing the ``->complete`` callback).
3. For a number of devices it is convenient to split suspend into the
"quiesce device" and "save device state" phases, in which cases
@ -459,22 +463,22 @@ When resuming from freeze, standby or memory sleep, the phases are:
Note, however, that new children may be registered below the device as
soon as the ``->resume`` callbacks occur; it's not necessary to wait
until the ``complete`` phase with that.
until the ``complete`` phase runs.
Moreover, if the preceding ``->prepare`` callback returned a positive
number, the device may have been left in runtime suspend throughout the
whole system suspend and resume (the ``suspend``, ``suspend_late``,
``suspend_noirq`` phases of system suspend and the ``resume_noirq``,
``resume_early``, ``resume`` phases of system resume may have been
skipped for it). In that case, the ``->complete`` callback is entirely
whole system suspend and resume (its ``->suspend``, ``->suspend_late``,
``->suspend_noirq``, ``->resume_noirq``,
``->resume_early``, and ``->resume`` callbacks may have been
skipped). In that case, the ``->complete`` callback is entirely
responsible for putting the device into a consistent state after system
suspend if necessary. [For example, it may need to queue up a runtime
resume request for the device for this purpose.] To check if that is
the case, the ``->complete`` callback can consult the device's
``power.direct_complete`` flag. Namely, if that flag is set when the
``->complete`` callback is being run, it has been called directly after
the preceding ``->prepare`` and special actions may be required
to make the device work correctly afterward.
``power.direct_complete`` flag. If that flag is set when the
``->complete`` callback is being run then the direct-complete mechanism
was used, and special actions may be required to make the device work
correctly afterward.
At the end of these phases, drivers should be as functional as they were before
suspending: I/O can be performed using DMA and IRQs, and the relevant clocks are
@ -575,10 +579,12 @@ and the phases are similar.
The ``->poweroff``, ``->poweroff_late`` and ``->poweroff_noirq`` callbacks
should do essentially the same things as the ``->suspend``, ``->suspend_late``
and ``->suspend_noirq`` callbacks, respectively. The only notable difference is
and ``->suspend_noirq`` callbacks, respectively. A notable difference is
that they need not store the device register values, because the registers
should already have been stored during the ``freeze``, ``freeze_late`` or
``freeze_noirq`` phases.
``freeze_noirq`` phases. Also, on many machines the firmware will power-down
the entire system, so it is not necessary for the callback to put the device in
a low-power state.
Leaving Hibernation
@ -764,70 +770,119 @@ device driver in question.
If it is necessary to resume a device from runtime suspend during a system-wide
transition into a sleep state, that can be done by calling
:c:func:`pm_runtime_resume` for it from the ``->suspend`` callback (or its
couterpart for transitions related to hibernation) of either the device's driver
or a subsystem responsible for it (for example, a bus type or a PM domain).
That is guaranteed to work by the requirement that subsystems must not change
the state of devices (possibly except for resuming them from runtime suspend)
:c:func:`pm_runtime_resume` from the ``->suspend`` callback (or the ``->freeze``
or ``->poweroff`` callback for transitions related to hibernation) of either the
device's driver or its subsystem (for example, a bus type or a PM domain).
However, subsystems must not otherwise change the runtime status of devices
from their ``->prepare`` and ``->suspend`` callbacks (or equivalent) *before*
invoking device drivers' ``->suspend`` callbacks (or equivalent).
.. _smart_suspend_flag:
The ``DPM_FLAG_SMART_SUSPEND`` Driver Flag
------------------------------------------
Some bus types and PM domains have a policy to resume all devices from runtime
suspend upfront in their ``->suspend`` callbacks, but that may not be really
necessary if the driver of the device can cope with runtime-suspended devices.
The driver can indicate that by setting ``DPM_FLAG_SMART_SUSPEND`` in
:c:member:`power.driver_flags` at the probe time, by passing it to the
:c:func:`dev_pm_set_driver_flags` helper. That also may cause middle-layer code
necessary if the device's driver can cope with runtime-suspended devices.
The driver can indicate this by setting ``DPM_FLAG_SMART_SUSPEND`` in
:c:member:`power.driver_flags` at probe time, with the assistance of the
:c:func:`dev_pm_set_driver_flags` helper routine.
Setting that flag causes the PM core and middle-layer code
(bus types, PM domains etc.) to skip the ``->suspend_late`` and
``->suspend_noirq`` callbacks provided by the driver if the device remains in
runtime suspend at the beginning of the ``suspend_late`` phase of system-wide
suspend (or in the ``poweroff_late`` phase of hibernation), when runtime PM
has been disabled for it, under the assumption that its state should not change
after that point until the system-wide transition is over (the PM core itself
does that for devices whose "noirq", "late" and "early" system-wide PM callbacks
are executed directly by it). If that happens, the driver's system-wide resume
callbacks, if present, may still be invoked during the subsequent system-wide
resume transition and the device's runtime power management status may be set
to "active" before enabling runtime PM for it, so the driver must be prepared to
cope with the invocation of its system-wide resume callbacks back-to-back with
its ``->runtime_suspend`` one (without the intervening ``->runtime_resume`` and
so on) and the final state of the device must reflect the "active" runtime PM
status in that case.
runtime suspend throughout those phases of the system-wide suspend (and
similarly for the "freeze" and "poweroff" parts of system hibernation).
[Otherwise the same driver
callback might be executed twice in a row for the same device, which would not
be valid in general.] If the middle-layer system-wide PM callbacks are present
for the device then they are responsible for skipping these driver callbacks;
if not then the PM core skips them. The subsystem callback routines can
determine whether they need to skip the driver callbacks by testing the return
value from the :c:func:`dev_pm_skip_suspend` helper function.
In addition, with ``DPM_FLAG_SMART_SUSPEND`` set, the driver's ``->thaw_noirq``
and ``->thaw_early`` callbacks are skipped in hibernation if the device remained
in runtime suspend throughout the preceding "freeze" transition. Again, if the
middle-layer callbacks are present for the device, they are responsible for
doing this, otherwise the PM core takes care of it.
The ``DPM_FLAG_MAY_SKIP_RESUME`` Driver Flag
--------------------------------------------
During system-wide resume from a sleep state it's easiest to put devices into
the full-power state, as explained in :file:`Documentation/power/runtime_pm.rst`.
[Refer to that document for more information regarding this particular issue as
well as for information on the device runtime power management framework in
general.]
However, it often is desirable to leave devices in suspend after system
transitions to the working state, especially if those devices had been in
general.] However, it often is desirable to leave devices in suspend after
system transitions to the working state, especially if those devices had been in
runtime suspend before the preceding system-wide suspend (or analogous)
transition. Device drivers can use the ``DPM_FLAG_LEAVE_SUSPENDED`` flag to
indicate to the PM core (and middle-layer code) that they prefer the specific
devices handled by them to be left suspended and they have no problems with
skipping their system-wide resume callbacks for this reason. Whether or not the
devices will actually be left in suspend may depend on their state before the
given system suspend-resume cycle and on the type of the system transition under
way. In particular, devices are not left suspended if that transition is a
restore from hibernation, as device states are not guaranteed to be reflected
by the information stored in the hibernation image in that case.
transition.
The middle-layer code involved in the handling of the device is expected to
indicate to the PM core if the device may be left in suspend by setting its
:c:member:`power.may_skip_resume` status bit which is checked by the PM core
during the "noirq" phase of the preceding system-wide suspend (or analogous)
transition. The middle layer is then responsible for handling the device as
appropriate in its "noirq" resume callback, which is executed regardless of
whether or not the device is left suspended, but the other resume callbacks
(except for ``->complete``) will be skipped automatically by the PM core if the
device really can be left in suspend.
To that end, device drivers can use the ``DPM_FLAG_MAY_SKIP_RESUME`` flag to
indicate to the PM core and middle-layer code that they allow their "noirq" and
"early" resume callbacks to be skipped if the device can be left in suspend
after system-wide PM transitions to the working state. Whether or not that is
the case generally depends on the state of the device before the given system
suspend-resume cycle and on the type of the system transition under way.
In particular, the "thaw" and "restore" transitions related to hibernation are
not affected by ``DPM_FLAG_MAY_SKIP_RESUME`` at all. [All callbacks are
issued during the "restore" transition regardless of the flag settings,
and whether or not any driver callbacks
are skipped during the "thaw" transition depends whether or not the
``DPM_FLAG_SMART_SUSPEND`` flag is set (see `above <smart_suspend_flag_>`_).
In addition, a device is not allowed to remain in runtime suspend if any of its
children will be returned to full power.]
For devices whose "noirq", "late" and "early" driver callbacks are invoked
directly by the PM core, all of the system-wide resume callbacks are skipped if
``DPM_FLAG_LEAVE_SUSPENDED`` is set and the device is in runtime suspend during
the ``suspend_noirq`` (or analogous) phase or the transition under way is a
proper system suspend (rather than anything related to hibernation) and the
device's wakeup settings are suitable for runtime PM (that is, it cannot
generate wakeup signals at all or it is allowed to wake up the system from
sleep).
The ``DPM_FLAG_MAY_SKIP_RESUME`` flag is taken into account in combination with
the :c:member:`power.may_skip_resume` status bit set by the PM core during the
"suspend" phase of suspend-type transitions. If the driver or the middle layer
has a reason to prevent the driver's "noirq" and "early" resume callbacks from
being skipped during the subsequent system resume transition, it should
clear :c:member:`power.may_skip_resume` in its ``->suspend``, ``->suspend_late``
or ``->suspend_noirq`` callback. [Note that the drivers setting
``DPM_FLAG_SMART_SUSPEND`` need to clear :c:member:`power.may_skip_resume` in
their ``->suspend`` callback in case the other two are skipped.]
Setting the :c:member:`power.may_skip_resume` status bit along with the
``DPM_FLAG_MAY_SKIP_RESUME`` flag is necessary, but generally not sufficient,
for the driver's "noirq" and "early" resume callbacks to be skipped. Whether or
not they should be skipped can be determined by evaluating the
:c:func:`dev_pm_skip_resume` helper function.
If that function returns ``true``, the driver's "noirq" and "early" resume
callbacks should be skipped and the device's runtime PM status will be set to
"suspended" by the PM core. Otherwise, if the device was runtime-suspended
during the preceding system-wide suspend transition and its
``DPM_FLAG_SMART_SUSPEND`` is set, its runtime PM status will be set to
"active" by the PM core. [Hence, the drivers that do not set
``DPM_FLAG_SMART_SUSPEND`` should not expect the runtime PM status of their
devices to be changed from "suspended" to "active" by the PM core during
system-wide resume-type transitions.]
If the ``DPM_FLAG_MAY_SKIP_RESUME`` flag is not set for a device, but
``DPM_FLAG_SMART_SUSPEND`` is set and the driver's "late" and "noirq" suspend
callbacks are skipped, its system-wide "noirq" and "early" resume callbacks, if
present, are invoked as usual and the device's runtime PM status is set to
"active" by the PM core before enabling runtime PM for it. In that case, the
driver must be prepared to cope with the invocation of its system-wide resume
callbacks back-to-back with its ``->runtime_suspend`` one (without the
intervening ``->runtime_resume`` and system-wide suspend callbacks) and the
final state of the device must reflect the "active" runtime PM status in that
case. [Note that this is not a problem at all if the driver's
``->suspend_late`` callback pointer points to the same function as its
``->runtime_suspend`` one and its ``->resume_early`` callback pointer points to
the same function as the ``->runtime_resume`` one, while none of the other
system-wide suspend-resume callbacks of the driver are present, for example.]
Likewise, if ``DPM_FLAG_MAY_SKIP_RESUME`` is set for a device, its driver's
system-wide "noirq" and "early" resume callbacks may be skipped while its "late"
and "noirq" suspend callbacks may have been executed (in principle, regardless
of whether or not ``DPM_FLAG_SMART_SUSPEND`` is set). In that case, the driver
needs to be able to cope with the invocation of its ``->runtime_resume``
callback back-to-back with its "late" and "noirq" suspend ones. [For instance,
that is not a concern if the driver sets both ``DPM_FLAG_SMART_SUSPEND`` and
``DPM_FLAG_MAY_SKIP_RESUME`` and uses the same pair of suspend/resume callback
functions for runtime PM and system-wide suspend/resume.]

54
Documentation/power/pci.rst
View File

@ -1004,41 +1004,39 @@ including the PCI bus type. The flags should be set once at the driver probe
time with the help of the dev_pm_set_driver_flags() function and they should not
be updated directly afterwards.
The DPM_FLAG_NEVER_SKIP flag prevents the PM core from using the direct-complete
mechanism allowing device suspend/resume callbacks to be skipped if the device
is in runtime suspend when the system suspend starts. That also affects all of
the ancestors of the device, so this flag should only be used if absolutely
necessary.
The DPM_FLAG_NO_DIRECT_COMPLETE flag prevents the PM core from using the
direct-complete mechanism allowing device suspend/resume callbacks to be skipped
if the device is in runtime suspend when the system suspend starts. That also
affects all of the ancestors of the device, so this flag should only be used if
absolutely necessary.
The DPM_FLAG_SMART_PREPARE flag instructs the PCI bus type to only return a
positive value from pci_pm_prepare() if the ->prepare callback provided by the
The DPM_FLAG_SMART_PREPARE flag causes the PCI bus type to return a positive
value from pci_pm_prepare() only if the ->prepare callback provided by the
driver of the device returns a positive value. That allows the driver to opt
out from using the direct-complete mechanism dynamically.
out from using the direct-complete mechanism dynamically (whereas setting
DPM_FLAG_NO_DIRECT_COMPLETE means permanent opt-out).
The DPM_FLAG_SMART_SUSPEND flag tells the PCI bus type that from the driver's
perspective the device can be safely left in runtime suspend during system
suspend. That causes pci_pm_suspend(), pci_pm_freeze() and pci_pm_poweroff()
to skip resuming the device from runtime suspend unless there are PCI-specific
reasons for doing that. Also, it causes pci_pm_suspend_late/noirq(),
pci_pm_freeze_late/noirq() and pci_pm_poweroff_late/noirq() to return early
if the device remains in runtime suspend in the beginning of the "late" phase
of the system-wide transition under way. Moreover, if the device is in
runtime suspend in pci_pm_resume_noirq() or pci_pm_restore_noirq(), its runtime
power management status will be changed to "active" (as it is going to be put
into D0 going forward), but if it is in runtime suspend in pci_pm_thaw_noirq(),
the function will set the power.direct_complete flag for it (to make the PM core
skip the subsequent "thaw" callbacks for it) and return.
to avoid resuming the device from runtime suspend unless there are PCI-specific
reasons for doing that. Also, it causes pci_pm_suspend_late/noirq() and
pci_pm_poweroff_late/noirq() to return early if the device remains in runtime
suspend during the "late" phase of the system-wide transition under way.
Moreover, if the device is in runtime suspend in pci_pm_resume_noirq() or
pci_pm_restore_noirq(), its runtime PM status will be changed to "active" (as it
is going to be put into D0 going forward).
Setting the DPM_FLAG_LEAVE_SUSPENDED flag means that the driver prefers the
device to be left in suspend after system-wide transitions to the working state.
This flag is checked by the PM core, but the PCI bus type informs the PM core
which devices may be left in suspend from its perspective (that happens during
the "noirq" phase of system-wide suspend and analogous transitions) and next it
uses the dev_pm_may_skip_resume() helper to decide whether or not to return from
pci_pm_resume_noirq() early, as the PM core will skip the remaining resume
callbacks for the device during the transition under way and will set its
runtime PM status to "suspended" if dev_pm_may_skip_resume() returns "true" for
it.
Setting the DPM_FLAG_MAY_SKIP_RESUME flag means that the driver allows its
"noirq" and "early" resume callbacks to be skipped if the device can be left
in suspend after a system-wide transition into the working state. This flag is
taken into consideration by the PM core along with the power.may_skip_resume
status bit of the device which is set by pci_pm_suspend_noirq() in certain
situations. If the PM core determines that the driver's "noirq" and "early"
resume callbacks should be skipped, the dev_pm_skip_resume() helper function
will return "true" and that will cause pci_pm_resume_noirq() and
pci_pm_resume_early() to return upfront without touching the device and
executing the driver callbacks.
3.2. Device Runtime Power Management
------------------------------------

14
drivers/acpi/acpi_lpss.c
View File

@ -1041,7 +1041,7 @@ static int acpi_lpss_do_suspend_late(struct device *dev)
{
int ret;
if (dev_pm_smart_suspend_and_suspended(dev))
if (dev_pm_skip_suspend(dev))
return 0;
ret = pm_generic_suspend_late(dev);
@ -1093,6 +1093,9 @@ static int acpi_lpss_resume_early(struct device *dev)
if (pdata->dev_desc->resume_from_noirq)
return 0;
if (dev_pm_skip_resume(dev))
return 0;
return acpi_lpss_do_resume_early(dev);
}
@ -1102,12 +1105,9 @@ static int acpi_lpss_resume_noirq(struct device *dev)
int ret;
/* Follow acpi_subsys_resume_noirq(). */
if (dev_pm_may_skip_resume(dev))
if (dev_pm_skip_resume(dev))
return 0;
if (dev_pm_smart_suspend_and_suspended(dev))
pm_runtime_set_active(dev);
ret = pm_generic_resume_noirq(dev);
if (ret)
return ret;
@ -1169,7 +1169,7 @@ static int acpi_lpss_poweroff_late(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
if (dev_pm_smart_suspend_and_suspended(dev))
if (dev_pm_skip_suspend(dev))
return 0;
if (pdata->dev_desc->resume_from_noirq)
@ -1182,7 +1182,7 @@ static int acpi_lpss_poweroff_noirq(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
if (dev_pm_smart_suspend_and_suspended(dev))
if (dev_pm_skip_suspend(dev))
return 0;
if (pdata->dev_desc->resume_from_noirq) {

2
drivers/acpi/acpi_tad.c
View File

@ -624,7 +624,7 @@ static int acpi_tad_probe(struct platform_device *pdev)
*/
device_init_wakeup(dev, true);
dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND |
DPM_FLAG_LEAVE_SUSPENDED);
DPM_FLAG_MAY_SKIP_RESUME);
/*
* The platform bus type layer tells the ACPI PM domain powers up the
* device, so set the runtime PM status of it to "active".

31
drivers/acpi/device_pm.c
View File

@ -1084,7 +1084,7 @@ int acpi_subsys_suspend_late(struct device *dev)
{
int ret;
if (dev_pm_smart_suspend_and_suspended(dev))
if (dev_pm_skip_suspend(dev))
return 0;
ret = pm_generic_suspend_late(dev);
@ -1100,10 +1100,8 @@ int acpi_subsys_suspend_noirq(struct device *dev)
{
int ret;
if (dev_pm_smart_suspend_and_suspended(dev)) {
dev->power.may_skip_resume = true;
if (dev_pm_skip_suspend(dev))
return 0;
}
ret = pm_generic_suspend_noirq(dev);
if (ret)
@ -1116,8 +1114,8 @@ int acpi_subsys_suspend_noirq(struct device *dev)
* acpi_subsys_complete() to take care of fixing up the device's state
* anyway, if need be.
*/
dev->power.may_skip_resume = device_may_wakeup(dev) ||
!device_can_wakeup(dev);
if (device_can_wakeup(dev) && !device_may_wakeup(dev))
dev->power.may_skip_resume = false;
return 0;
}
@ -1129,17 +1127,9 @@ EXPORT_SYMBOL_GPL(acpi_subsys_suspend_noirq);
*/
static int acpi_subsys_resume_noirq(struct device *dev)
{
if (dev_pm_may_skip_resume(dev))
if (dev_pm_skip_resume(dev))
return 0;
/*
* Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend
* during system suspend, so update their runtime PM status to "active"
* as they will be put into D0 going forward.
*/
if (dev_pm_smart_suspend_and_suspended(dev))
pm_runtime_set_active(dev);
return pm_generic_resume_noirq(dev);
}
@ -1153,7 +1143,12 @@ static int acpi_subsys_resume_noirq(struct device *dev)
*/
static int acpi_subsys_resume_early(struct device *dev)
{
int ret = acpi_dev_resume(dev);
int ret;
if (dev_pm_skip_resume(dev))
return 0;
ret = acpi_dev_resume(dev);
return ret ? ret : pm_generic_resume_early(dev);
}
@ -1218,7 +1213,7 @@ static int acpi_subsys_poweroff_late(struct device *dev)
{
int ret;
if (dev_pm_smart_suspend_and_suspended(dev))
if (dev_pm_skip_suspend(dev))
return 0;
ret = pm_generic_poweroff_late(dev);
@ -1234,7 +1229,7 @@ static int acpi_subsys_poweroff_late(struct device *dev)
*/
static int acpi_subsys_poweroff_noirq(struct device *dev)
{
if (dev_pm_smart_suspend_and_suspended(dev))
if (dev_pm_skip_suspend(dev))
return 0;
return pm_generic_poweroff_noirq(dev);

352
drivers/base/power/main.c
View File

@ -562,72 +562,26 @@ static void dpm_watchdog_clear(struct dpm_watchdog *wd)
/*------------------------- Resume routines -------------------------*/
/**
* suspend_event - Return a "suspend" message for given "resume" one.
* @resume_msg: PM message representing a system-wide resume transition.
*/
static pm_message_t suspend_event(pm_message_t resume_msg)
{
switch (resume_msg.event) {
case PM_EVENT_RESUME:
return PMSG_SUSPEND;
case PM_EVENT_THAW:
case PM_EVENT_RESTORE:
return PMSG_FREEZE;
case PM_EVENT_RECOVER:
return PMSG_HIBERNATE;
}
return PMSG_ON;
}
/**
* dev_pm_may_skip_resume - System-wide device resume optimization check.
* dev_pm_skip_resume - System-wide device resume optimization check.
* @dev: Target device.
*
* Checks whether or not the device may be left in suspend after a system-wide
* transition to the working state.
* 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_may_skip_resume(struct device *dev)
bool dev_pm_skip_resume(struct device *dev)
{
return !dev->power.must_resume && pm_transition.event != PM_EVENT_RESTORE;
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;
}
static pm_callback_t dpm_subsys_resume_noirq_cb(struct device *dev,
pm_message_t state,
const char **info_p)
{
pm_callback_t callback;
const char *info;
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);
} else {
return NULL;
}
if (info_p)
*info_p = info;
return callback;
}
static pm_callback_t dpm_subsys_suspend_noirq_cb(struct device *dev,
pm_message_t state,
const char **info_p);
static pm_callback_t dpm_subsys_suspend_late_cb(struct device *dev,
pm_message_t state,
const char **info_p);
/**
* device_resume_noirq - Execute a "noirq resume" callback for given device.
* @dev: Device to handle.
@ -639,8 +593,8 @@ static pm_callback_t dpm_subsys_suspend_late_cb(struct device *dev,
*/
static int device_resume_noirq(struct device *dev, pm_message_t state, bool async)
{
pm_callback_t callback;
const char *info;
pm_callback_t callback = NULL;
const char *info = NULL;
bool skip_resume;
int error = 0;
@ -656,37 +610,41 @@ static int device_resume_noirq(struct device *dev, pm_message_t state, bool asyn
if (!dpm_wait_for_superior(dev, async))
goto Out;
skip_resume = dev_pm_may_skip_resume(dev);
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);
callback = dpm_subsys_resume_noirq_cb(dev, state, &info);
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_pm_smart_suspend_and_suspended(dev)) {
pm_message_t suspend_msg = suspend_event(state);
/*
* If "freeze" callbacks have been skipped during a transition
* related to hibernation, the subsequent "thaw" callbacks must
* be skipped too or bad things may happen. Otherwise, resume
* callbacks are going to be run for the device, so its runtime
* PM status must be changed to reflect the new state after the
* transition under way.
*/
if (!dpm_subsys_suspend_late_cb(dev, suspend_msg, NULL) &&
!dpm_subsys_suspend_noirq_cb(dev, suspend_msg, NULL)) {
if (state.event == PM_EVENT_THAW) {
skip_resume = true;
goto Skip;
} else {
pm_runtime_set_active(dev);
}
}
}
if (dev->driver && dev->driver->pm) {
info = "noirq driver ";
callback = pm_noirq_op(dev->driver->pm, state);
@ -698,20 +656,6 @@ Run:
Skip:
dev->power.is_noirq_suspended = false;
if (skip_resume) {
/* Make the next phases of resume skip the device. */
dev->power.is_late_suspended = false;
dev->power.is_suspended = false;
/*
* The device is going to be left in suspend, but it might not
* have been in runtime suspend before the system suspended, so
* its runtime PM status needs to be updated to avoid confusing
* the runtime PM framework when runtime PM is enabled for the
* device again.
*/
pm_runtime_set_suspended(dev);
}
Out:
complete_all(&dev->power.completion);
TRACE_RESUME(error);
@ -810,35 +754,6 @@ void dpm_resume_noirq(pm_message_t state)
cpuidle_resume();
}
static pm_callback_t dpm_subsys_resume_early_cb(struct device *dev,
pm_message_t state,
const char **info_p)
{
pm_callback_t callback;
const char *info;
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);
} else {
return NULL;
}
if (info_p)
*info_p = info;
return callback;
}
/**
* device_resume_early - Execute an "early resume" callback for given device.
* @dev: Device to handle.
@ -849,8 +764,8 @@ static pm_callback_t dpm_subsys_resume_early_cb(struct device *dev,
*/
static int device_resume_early(struct device *dev, pm_message_t state, bool async)
{
pm_callback_t callback;
const char *info;
pm_callback_t callback = NULL;
const char *info = NULL;
int error = 0;
TRACE_DEVICE(dev);
@ -865,17 +780,37 @@ static int device_resume_early(struct device *dev, pm_message_t state, bool asyn
if (!dpm_wait_for_superior(dev, async))
goto Out;
callback = dpm_subsys_resume_early_cb(dev, state, &info);
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 (!callback && dev->driver && dev->driver->pm) {
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:
Out:
TRACE_RESUME(error);
pm_runtime_enable(dev);
@ -1245,61 +1180,6 @@ static void dpm_superior_set_must_resume(struct device *dev)
device_links_read_unlock(idx);
}
static pm_callback_t dpm_subsys_suspend_noirq_cb(struct device *dev,
pm_message_t state,
const char **info_p)
{
pm_callback_t callback;
const char *info;
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);
} else {
return NULL;
}
if (info_p)
*info_p = info;
return callback;
}
static bool device_must_resume(struct device *dev, pm_message_t state,
bool no_subsys_suspend_noirq)
{
pm_message_t resume_msg = resume_event(state);
/*
* If all of the device driver's "noirq", "late" and "early" callbacks
* are invoked directly by the core, the decision to allow the device to
* stay in suspend can be based on its current runtime PM status and its
* wakeup settings.
*/
if (no_subsys_suspend_noirq &&
!dpm_subsys_suspend_late_cb(dev, state, NULL) &&
!dpm_subsys_resume_early_cb(dev, resume_msg, NULL) &&
!dpm_subsys_resume_noirq_cb(dev, resume_msg, NULL))
return !pm_runtime_status_suspended(dev) &&
(resume_msg.event != PM_EVENT_RESUME ||
(device_can_wakeup(dev) && !device_may_wakeup(dev)));
/*
* The only safe strategy here is to require that if the device may not
* be left in suspend, resume callbacks must be invoked for it.
*/
return !dev->power.may_skip_resume;
}
/**
* __device_suspend_noirq - Execute a "noirq suspend" callback for given device.
* @dev: Device to handle.
@ -1311,9 +1191,8 @@ static bool device_must_resume(struct device *dev, pm_message_t state,
*/
static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async)
{
pm_callback_t callback;
const char *info;
bool no_subsys_cb = false;
pm_callback_t callback = NULL;
const char *info = NULL;
int error = 0;
TRACE_DEVICE(dev);
@ -1327,13 +1206,23 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a
if (dev->power.syscore || dev->power.direct_complete)
goto Complete;
callback = dpm_subsys_suspend_noirq_cb(dev, state, &info);
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;
no_subsys_cb = !dpm_subsys_suspend_late_cb(dev, state, NULL);
if (dev_pm_smart_suspend_and_suspended(dev) && no_subsys_cb)
if (dev_pm_skip_suspend(dev))
goto Skip;
if (dev->driver && dev->driver->pm) {
@ -1351,13 +1240,16 @@ Run:
Skip:
dev->power.is_noirq_suspended = true;
if (dev_pm_test_driver_flags(dev, DPM_FLAG_LEAVE_SUSPENDED)) {
dev->power.must_resume = dev->power.must_resume ||
atomic_read(&dev->power.usage_count) > 1 ||
device_must_resume(dev, state, no_subsys_cb);
} else {
/*
* 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);
@ -1474,35 +1366,6 @@ static void dpm_propagate_wakeup_to_parent(struct device *dev)
spin_unlock_irq(&parent->power.lock);
}
static pm_callback_t dpm_subsys_suspend_late_cb(struct device *dev,
pm_message_t state,
const char **info_p)
{
pm_callback_t callback;
const char *info;
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);
} else {
return NULL;
}
if (info_p)
*info_p = info;
return callback;
}
/**
* __device_suspend_late - Execute a "late suspend" callback for given device.
* @dev: Device to handle.
@ -1513,8 +1376,8 @@ static pm_callback_t dpm_subsys_suspend_late_cb(struct device *dev,
*/
static int __device_suspend_late(struct device *dev, pm_message_t state, bool async)
{
pm_callback_t callback;
const char *info;
pm_callback_t callback = NULL;
const char *info = NULL;
int error = 0;
TRACE_DEVICE(dev);
@ -1535,12 +1398,23 @@ static int __device_suspend_late(struct device *dev, pm_message_t state, bool as
if (dev->power.syscore || dev->power.direct_complete)
goto Complete;
callback = dpm_subsys_suspend_late_cb(dev, state, &info);
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_smart_suspend_and_suspended(dev) &&
!dpm_subsys_suspend_noirq_cb(dev, state, NULL))
if (dev_pm_skip_suspend(dev))
goto Skip;
if (dev->driver && dev->driver->pm) {
@ -1766,7 +1640,7 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
dev->power.direct_complete = false;
}
dev->power.may_skip_resume = false;
dev->power.may_skip_resume = true;
dev->power.must_resume = false;
dpm_watchdog_set(&wd, dev);
@ -1970,7 +1844,7 @@ unlock:
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_NEVER_SKIP);
!dev_pm_test_driver_flags(dev, DPM_FLAG_NO_DIRECT_COMPLETE);
spin_unlock_irq(&dev->power.lock);
return 0;
}
@ -2128,7 +2002,7 @@ void device_pm_check_callbacks(struct device *dev)
spin_unlock_irq(&dev->power.lock);
}
bool dev_pm_smart_suspend_and_suspended(struct device *dev)
bool dev_pm_skip_suspend(struct device *dev)
{
return dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) &&
pm_runtime_status_suspended(dev);

6
drivers/base/power/runtime.c
View File

@ -523,13 +523,11 @@ static int rpm_suspend(struct device *dev, int rpmflags)
repeat:
retval = rpm_check_suspend_allowed(dev);
if (retval < 0)
; /* Conditions are wrong. */
goto out; /* Conditions are wrong. */
/* Synchronous suspends are not allowed in the RPM_RESUMING state. */
else if (dev->power.runtime_status == RPM_RESUMING &&
!(rpmflags & RPM_ASYNC))
if (dev->power.runtime_status == RPM_RESUMING && !(rpmflags & RPM_ASYNC))
retval = -EAGAIN;
if (retval)
goto out;

4
drivers/base/power/sysfs.c
View File

@ -666,7 +666,7 @@ int dpm_sysfs_add(struct device *dev)
if (rc)
return rc;
if (pm_runtime_callbacks_present(dev)) {
if (!pm_runtime_has_no_callbacks(dev)) {
rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
if (rc)
goto err_out;
@ -709,7 +709,7 @@ int dpm_sysfs_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid)
if (rc)
return rc;
if (pm_runtime_callbacks_present(dev)) {
if (!pm_runtime_has_no_callbacks(dev)) {
rc = sysfs_group_change_owner(
&dev->kobj, &pm_runtime_attr_group, kuid, kgid);
if (rc)

6
drivers/clk/clk.c
View File

@ -114,7 +114,11 @@ static int clk_pm_runtime_get(struct clk_core *core)
return 0;
ret = pm_runtime_get_sync(core->dev);
return ret < 0 ? ret : 0;
if (ret < 0) {
pm_runtime_put_noidle(core->dev);
return ret;
}
return 0;
}
static void clk_pm_runtime_put(struct clk_core *core)

2
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
View File

@ -191,7 +191,7 @@ int amdgpu_driver_load_kms(struct drm_device *dev, unsigned long flags)
}
if (adev->runpm) {
dev_pm_set_driver_flags(dev->dev, DPM_FLAG_NEVER_SKIP);
dev_pm_set_driver_flags(dev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
pm_runtime_use_autosuspend(dev->dev);
pm_runtime_set_autosuspend_delay(dev->dev, 5000);
pm_runtime_set_active(dev->dev);

2
drivers/gpu/drm/i915/intel_runtime_pm.c
View File

@ -549,7 +549,7 @@ void intel_runtime_pm_enable(struct intel_runtime_pm *rpm)
* becaue the HDA driver may require us to enable the audio power
* domain during system suspend.
*/
dev_pm_set_driver_flags(kdev, DPM_FLAG_NEVER_SKIP);
dev_pm_set_driver_flags(kdev, DPM_FLAG_NO_DIRECT_COMPLETE);
pm_runtime_set_autosuspend_delay(kdev, 10000); /* 10s */
pm_runtime_mark_last_busy(kdev);

2
drivers/gpu/drm/radeon/radeon_kms.c
View File

@ -158,7 +158,7 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
}
if (radeon_is_px(dev)) {
dev_pm_set_driver_flags(dev->dev, DPM_FLAG_NEVER_SKIP);
dev_pm_set_driver_flags(dev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
pm_runtime_use_autosuspend(dev->dev);
pm_runtime_set_autosuspend_delay(dev->dev, 5000);
pm_runtime_set_active(dev->dev);

4
drivers/i2c/busses/i2c-designware-platdrv.c
View File

@ -357,12 +357,12 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
if (dev->flags & ACCESS_NO_IRQ_SUSPEND) {
dev_pm_set_driver_flags(&pdev->dev,
DPM_FLAG_SMART_PREPARE |
DPM_FLAG_LEAVE_SUSPENDED);
DPM_FLAG_MAY_SKIP_RESUME);
} else {
dev_pm_set_driver_flags(&pdev->dev,
DPM_FLAG_SMART_PREPARE |
DPM_FLAG_SMART_SUSPEND |
DPM_FLAG_LEAVE_SUSPENDED);
DPM_FLAG_MAY_SKIP_RESUME);
}
/* The code below assumes runtime PM to be disabled. */

2
drivers/misc/mei/pci-me.c
View File

@ -241,7 +241,7 @@ static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
* MEI requires to resume from runtime suspend mode
* in order to perform link reset flow upon system suspend.
*/
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NEVER_SKIP);
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
/*
* ME maps runtime suspend/resume to D0i states,

2
drivers/misc/mei/pci-txe.c
View File

@ -128,7 +128,7 @@ static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
* MEI requires to resume from runtime suspend mode
* in order to perform link reset flow upon system suspend.
*/
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NEVER_SKIP);
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
/*
* TXE maps runtime suspend/resume to own power gating states,

2
drivers/net/ethernet/intel/e1000e/netdev.c
View File

@ -7549,7 +7549,7 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
e1000_print_device_info(adapter);
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NEVER_SKIP);
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
if (pci_dev_run_wake(pdev) && hw->mac.type < e1000_pch_cnp)
pm_runtime_put_noidle(&pdev->dev);

2
drivers/net/ethernet/intel/igb/igb_main.c
View File

@ -3445,7 +3445,7 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
}
}
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NEVER_SKIP);
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
pm_runtime_put_noidle(&pdev->dev);
return 0;

2
drivers/net/ethernet/intel/igc/igc_main.c
View File

@ -4825,7 +4825,7 @@ static int igc_probe(struct pci_dev *pdev,
pcie_print_link_status(pdev);
netdev_info(netdev, "MAC: %pM\n", netdev->dev_addr);
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NEVER_SKIP);
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
pm_runtime_put_noidle(&pdev->dev);

2
drivers/pci/hotplug/pciehp_core.c
View File

@ -275,7 +275,7 @@ static int pciehp_suspend(struct pcie_device *dev)
* If the port is already runtime suspended we can keep it that
* way.
*/
if (dev_pm_smart_suspend_and_suspended(&dev->port->dev))
if (dev_pm_skip_suspend(&dev->port->dev))
return 0;
pciehp_disable_interrupt(dev);

34
drivers/pci/pci-driver.c
View File

@ -776,7 +776,7 @@ static int pci_pm_suspend(struct device *dev)
static int pci_pm_suspend_late(struct device *dev)
{
if (dev_pm_smart_suspend_and_suspended(dev))
if (dev_pm_skip_suspend(dev))
return 0;
pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
@ -789,10 +789,8 @@ static int pci_pm_suspend_noirq(struct device *dev)
struct pci_dev *pci_dev = to_pci_dev(dev);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (dev_pm_smart_suspend_and_suspended(dev)) {
dev->power.may_skip_resume = true;
if (dev_pm_skip_suspend(dev))
return 0;
}
if (pci_has_legacy_pm_support(pci_dev))
return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
@ -880,8 +878,8 @@ Fixup:
* pci_pm_complete() to take care of fixing up the device's state
* anyway, if need be.
*/
dev->power.may_skip_resume = device_may_wakeup(dev) ||
!device_can_wakeup(dev);
if (device_can_wakeup(dev) && !device_may_wakeup(dev))
dev->power.may_skip_resume = false;
return 0;
}
@ -893,17 +891,9 @@ static int pci_pm_resume_noirq(struct device *dev)
pci_power_t prev_state = pci_dev->current_state;
bool skip_bus_pm = pci_dev->skip_bus_pm;
if (dev_pm_may_skip_resume(dev))
if (dev_pm_skip_resume(dev))
return 0;
/*
* Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend
* during system suspend, so update their runtime PM status to "active"
* as they are going to be put into D0 shortly.
*/
if (dev_pm_smart_suspend_and_suspended(dev))
pm_runtime_set_active(dev);
/*
* In the suspend-to-idle case, devices left in D0 during suspend will
* stay in D0, so it is not necessary to restore or update their
@ -928,6 +918,14 @@ static int pci_pm_resume_noirq(struct device *dev)
return 0;
}
static int pci_pm_resume_early(struct device *dev)
{
if (dev_pm_skip_resume(dev))
return 0;
return pm_generic_resume_early(dev);
}
static int pci_pm_resume(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
@ -961,6 +959,7 @@ static int pci_pm_resume(struct device *dev)
#define pci_pm_suspend_late NULL
#define pci_pm_suspend_noirq NULL
#define pci_pm_resume NULL
#define pci_pm_resume_early NULL
#define pci_pm_resume_noirq NULL
#endif /* !CONFIG_SUSPEND */
@ -1127,7 +1126,7 @@ static int pci_pm_poweroff(struct device *dev)
static int pci_pm_poweroff_late(struct device *dev)
{
if (dev_pm_smart_suspend_and_suspended(dev))
if (dev_pm_skip_suspend(dev))
return 0;
pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
@ -1140,7 +1139,7 @@ static int pci_pm_poweroff_noirq(struct device *dev)
struct pci_dev *pci_dev = to_pci_dev(dev);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (dev_pm_smart_suspend_and_suspended(dev))
if (dev_pm_skip_suspend(dev))
return 0;
if (pci_has_legacy_pm_support(pci_dev))
@ -1358,6 +1357,7 @@ static const struct dev_pm_ops pci_dev_pm_ops = {
.suspend = pci_pm_suspend,
.suspend_late = pci_pm_suspend_late,
.resume = pci_pm_resume,
.resume_early = pci_pm_resume_early,
.freeze = pci_pm_freeze,
.thaw = pci_pm_thaw,
.poweroff = pci_pm_poweroff,

2
drivers/pci/pcie/portdrv_pci.c
View File

@ -115,7 +115,7 @@ static int pcie_portdrv_probe(struct pci_dev *dev,
pci_save_state(dev);
dev_pm_set_driver_flags(&dev->dev, DPM_FLAG_NEVER_SKIP |
dev_pm_set_driver_flags(&dev->dev, DPM_FLAG_NO_DIRECT_COMPLETE |
DPM_FLAG_SMART_SUSPEND);
if (pci_bridge_d3_possible(dev)) {

3
fs/block_dev.c
View File

@ -2023,8 +2023,7 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (bdev_read_only(I_BDEV(bd_inode)))
return -EPERM;
/* uswsusp needs write permission to the swap */
if (IS_SWAPFILE(bd_inode) && !hibernation_available())
if (IS_SWAPFILE(bd_inode) && !is_hibernate_resume_dev(bd_inode))
return -ETXTBSY;
if (!iov_iter_count(from))

32
include/linux/pm.h
View File

@ -544,31 +544,17 @@ struct pm_subsys_data {
* These flags can be set by device drivers at the probe time. They need not be
* cleared by the drivers as the driver core will take care of that.
*
* NEVER_SKIP: Do not skip all system suspend/resume callbacks for the device.
* SMART_PREPARE: Check the return value of the driver's ->prepare callback.
* SMART_SUSPEND: No need to resume the device from runtime suspend.
* LEAVE_SUSPENDED: Avoid resuming the device during system resume if possible.
* NO_DIRECT_COMPLETE: Do not apply direct-complete optimization to the device.
* SMART_PREPARE: Take the driver ->prepare callback return value into account.
* SMART_SUSPEND: Avoid resuming the device from runtime suspend.
* MAY_SKIP_RESUME: Allow driver "noirq" and "early" callbacks to be skipped.
*
* Setting SMART_PREPARE instructs bus types and PM domains which may want
* system suspend/resume callbacks to be skipped for the device to return 0 from
* their ->prepare callbacks if the driver's ->prepare callback returns 0 (in
* other words, the system suspend/resume callbacks can only be skipped for the
* device if its driver doesn't object against that). This flag has no effect
* if NEVER_SKIP is set.
*
* Setting SMART_SUSPEND instructs bus types and PM domains which may want to
* runtime resume the device upfront during system suspend that doing so is not
* necessary from the driver's perspective. It also may cause them to skip
* invocations of the ->suspend_late and ->suspend_noirq callbacks provided by
* the driver if they decide to leave the device in runtime suspend.
*
* Setting LEAVE_SUSPENDED informs the PM core and middle-layer code that the
* driver prefers the device to be left in suspend after system resume.
* See Documentation/driver-api/pm/devices.rst for details.
*/
#define DPM_FLAG_NEVER_SKIP BIT(0)
#define DPM_FLAG_NO_DIRECT_COMPLETE BIT(0)
#define DPM_FLAG_SMART_PREPARE BIT(1)
#define DPM_FLAG_SMART_SUSPEND BIT(2)
#define DPM_FLAG_LEAVE_SUSPENDED BIT(3)
#define DPM_FLAG_MAY_SKIP_RESUME BIT(3)
struct dev_pm_info {
pm_message_t power_state;
@ -758,8 +744,8 @@ 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);
extern bool dev_pm_may_skip_resume(struct device *dev);
extern bool dev_pm_smart_suspend_and_suspended(struct device *dev);
extern bool dev_pm_skip_resume(struct device *dev);
extern bool dev_pm_skip_suspend(struct device *dev);
#else /* !CONFIG_PM_SLEEP */

4
include/linux/pm_runtime.h
View File

@ -102,9 +102,9 @@ static inline bool pm_runtime_enabled(struct device *dev)
return !dev->power.disable_depth;
}
static inline bool pm_runtime_callbacks_present(struct device *dev)
static inline bool pm_runtime_has_no_callbacks(struct device *dev)
{
return !dev->power.no_callbacks;
return dev->power.no_callbacks;
}
static inline void pm_runtime_mark_last_busy(struct device *dev)

6
include/linux/suspend.h
View File

@ -466,6 +466,12 @@ static inline bool system_entering_hibernation(void) { return false; }
static inline bool hibernation_available(void) { return false; }
#endif /* CONFIG_HIBERNATION */
#ifdef CONFIG_HIBERNATION_SNAPSHOT_DEV
int is_hibernate_resume_dev(const struct inode *);
#else
static inline int is_hibernate_resume_dev(const struct inode *i) { return 0; }
#endif
/* Hibernation and suspend events */
#define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */
#define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */

12
kernel/power/Kconfig
View File

@ -80,6 +80,18 @@ config HIBERNATION
For more information take a look at <file:Documentation/power/swsusp.rst>.
config HIBERNATION_SNAPSHOT_DEV
bool "Userspace snapshot device"
depends on HIBERNATION
default y
---help---
Device used by the uswsusp tools.
Say N if no snapshotting from userspace is needed, this also
reduces the attack surface of the kernel.
If in doubt, say Y.
config PM_STD_PARTITION
string "Default resume partition"
depends on HIBERNATION

3
kernel/power/Makefile
View File

@ -10,7 +10,8 @@ obj-$(CONFIG_VT_CONSOLE_SLEEP) += console.o
obj-$(CONFIG_FREEZER) += process.o
obj-$(CONFIG_SUSPEND) += suspend.o
obj-$(CONFIG_PM_TEST_SUSPEND) += suspend_test.o
obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o
obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o
obj-$(CONFIG_HIBERNATION_SNAPSHOT_DEV) += user.o
obj-$(CONFIG_PM_AUTOSLEEP) += autosleep.o
obj-$(CONFIG_PM_WAKELOCKS) += wakelock.o

20
kernel/power/hibernate.c
View File

@ -67,6 +67,18 @@ bool freezer_test_done;
static const struct platform_hibernation_ops *hibernation_ops;
static atomic_t hibernate_atomic = ATOMIC_INIT(1);
bool hibernate_acquire(void)
{
return atomic_add_unless(&hibernate_atomic, -1, 0);
}
void hibernate_release(void)
{
atomic_inc(&hibernate_atomic);
}
bool hibernation_available(void)
{
return nohibernate == 0 && !security_locked_down(LOCKDOWN_HIBERNATION);
@ -704,7 +716,7 @@ int hibernate(void)
lock_system_sleep();
/* The snapshot device should not be opened while we're running */
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
if (!hibernate_acquire()) {
error = -EBUSY;
goto Unlock;
}
@ -775,7 +787,7 @@ int hibernate(void)
Exit:
__pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
pm_restore_console();
atomic_inc(&snapshot_device_available);
hibernate_release();
Unlock:
unlock_system_sleep();
pr_info("hibernation exit\n");
@ -880,7 +892,7 @@ static int software_resume(void)
goto Unlock;
/* The snapshot device should not be opened while we're running */
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
if (!hibernate_acquire()) {
error = -EBUSY;
swsusp_close(FMODE_READ);
goto Unlock;
@ -911,7 +923,7 @@ static int software_resume(void)
__pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
pm_restore_console();
pr_info("resume failed (%d)\n", error);
atomic_inc(&snapshot_device_available);
hibernate_release();
/* For success case, the suspend path will release the lock */
Unlock:
mutex_unlock(&system_transition_mutex);

4
kernel/power/power.h
View File

@ -154,8 +154,8 @@ extern int snapshot_write_next(struct snapshot_handle *handle);
extern void snapshot_write_finalize(struct snapshot_handle *handle);
extern int snapshot_image_loaded(struct snapshot_handle *handle);
/* If unset, the snapshot device cannot be open. */
extern atomic_t snapshot_device_available;
extern bool hibernate_acquire(void);
extern void hibernate_release(void);
extern sector_t alloc_swapdev_block(int swap);
extern void free_all_swap_pages(int swap);

22
kernel/power/user.c
View File

@ -35,9 +35,13 @@ static struct snapshot_data {
bool ready;
bool platform_support;
bool free_bitmaps;
struct inode *bd_inode;
} snapshot_state;
atomic_t snapshot_device_available = ATOMIC_INIT(1);
int is_hibernate_resume_dev(const struct inode *bd_inode)
{
return hibernation_available() && snapshot_state.bd_inode == bd_inode;
}
static int snapshot_open(struct inode *inode, struct file *filp)
{
@ -49,13 +53,13 @@ static int snapshot_open(struct inode *inode, struct file *filp)
lock_system_sleep();
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
if (!hibernate_acquire()) {
error = -EBUSY;
goto Unlock;
}
if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
atomic_inc(&snapshot_device_available);
hibernate_release();
error = -ENOSYS;
goto Unlock;
}
@ -92,11 +96,12 @@ static int snapshot_open(struct inode *inode, struct file *filp)
__pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
}
if (error)
atomic_inc(&snapshot_device_available);
hibernate_release();
data->frozen = false;
data->ready = false;
data->platform_support = false;
data->bd_inode = NULL;
Unlock:
unlock_system_sleep();
@ -112,6 +117,7 @@ static int snapshot_release(struct inode *inode, struct file *filp)
swsusp_free();
data = filp->private_data;
data->bd_inode = NULL;
free_all_swap_pages(data->swap);
if (data->frozen) {
pm_restore_gfp_mask();
@ -122,7 +128,7 @@ static int snapshot_release(struct inode *inode, struct file *filp)
}
pm_notifier_call_chain(data->mode == O_RDONLY ?
PM_POST_HIBERNATION : PM_POST_RESTORE);
atomic_inc(&snapshot_device_available);
hibernate_release();
unlock_system_sleep();
@ -204,6 +210,7 @@ struct compat_resume_swap_area {
static int snapshot_set_swap_area(struct snapshot_data *data,
void __user *argp)
{
struct block_device *bdev;
sector_t offset;
dev_t swdev;
@ -234,9 +241,12 @@ static int snapshot_set_swap_area(struct snapshot_data *data,
data->swap = -1;
return -EINVAL;
}
data->swap = swap_type_of(swdev, offset, NULL);
data->swap = swap_type_of(swdev, offset, &bdev);
if (data->swap < 0)
return -ENODEV;
data->bd_inode = bdev->bd_inode;
bdput(bdev);
return 0;
}