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Merge tag 'pm-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Browse Source 
Pull power management updates from Rafael Wysocki:
 "These rework the system-wide PM driver flags, make runtime switching
  of cpuidle governors easier, improve the user space hibernation
  interface code, add intel-speed-select interface documentation, add
  more debug messages to the ACPI code handling suspend to idle, update
  the cpufreq core and drivers, fix a minor issue in the cpuidle core
  and update two cpuidle drivers, improve the PM-runtime framework,
  update the Intel RAPL power capping driver, update devfreq core and
  drivers, and clean up the cpupower utility.

  Specifics:

   - Rework the system-wide PM driver flags to make them easier to
     understand and use and update their documentation (Rafael Wysocki,
     Alan Stern).

   - Allow cpuidle governors to be switched at run time regardless of
     the kernel configuration and update the related documentation
     accordingly (Hanjun Guo).

   - Improve the resume device handling in the user space hibernarion
     interface code (Domenico Andreoli).

   - Document the intel-speed-select sysfs interface (Srinivas
     Pandruvada).

   - Make the ACPI code handing suspend to idle print more debug
     messages to help diagnose issues with it (Rafael Wysocki).

   - Fix a helper routine in the cpufreq core and correct a typo in the
     struct cpufreq_driver kerneldoc comment (Rafael Wysocki, Wang
     Wenhu).

   - Update cpufreq drivers:

      - Make the intel_pstate driver start in the passive mode by
        default on systems without HWP (Rafael Wysocki).

      - Add i.MX7ULP support to the imx-cpufreq-dt driver and add
        i.MX7ULP to the cpufreq-dt-platdev blacklist (Peng Fan).

      - Convert the qoriq cpufreq driver to a platform one, make the
        platform code create a suitable device object for it and add
        platform dependencies to it (Mian Yousaf Kaukab, Geert
        Uytterhoeven).

      - Fix wrong compatible binding in the qcom driver (Ansuel Smith).

      - Build the omap driver by default for ARCH_OMAP2PLUS (Anders
        Roxell).

      - Add r8a7742 SoC support to the dt cpufreq driver (Lad
        Prabhakar).

   - Update cpuidle core and drivers:

      - Fix three reference count leaks in error code paths in the
        cpuidle core (Qiushi Wu).

      - Convert Qualcomm SPM to a generic cpuidle driver (Stephan
        Gerhold).

      - Fix up the execution order when entering a domain idle state in
        the PSCI driver (Ulf Hansson).

   - Fix a reference counting issue related to clock management and
     clean up two oddities in the PM-runtime framework (Rafael Wysocki,
     Andy Shevchenko).

   - Add ElkhartLake support to the Intel RAPL power capping driver and
     remove an unused local MSR definition from it (Jacob Pan, Sumeet
     Pawnikar).

   - Update devfreq core and drivers:

      - Replace strncpy() with strscpy() in the devfreq core and use
        lockdep asserts instead of manual checks for a locked mutex in
        it (Dmitry Osipenko, Krzysztof Kozlowski).

      - Add a generic imx bus scaling driver and make it register an
        interconnect device (Leonard Crestez, Gustavo A. R. Silva).

      - Make the cpufreq notifier in the tegra30 driver take boosting
        into account and delete an unuseful error message from that
        driver (Dmitry Osipenko, Markus Elfring).

   - Remove unneeded semicolon from the cpupower code (Zou Wei)"

* tag 'pm-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (51 commits)
  cpuidle: Fix three reference count leaks
  PM: runtime: Replace pm_runtime_callbacks_present()
  PM / devfreq: Use lockdep asserts instead of manual checks for locked mutex
  PM / devfreq: imx-bus: Fix inconsistent IS_ERR and PTR_ERR
  PM / devfreq: Replace strncpy with strscpy
  PM / devfreq: imx: Register interconnect device
  PM / devfreq: Add generic imx bus scaling driver
  PM / devfreq: tegra30: Delete an error message in tegra_devfreq_probe()
  PM / devfreq: tegra30: Make CPUFreq notifier to take into account boosting
  PM: hibernate: Restrict writes to the resume device
  PM: runtime: clk: Fix clk_pm_runtime_get() error path
  cpuidle: Convert Qualcomm SPM driver to a generic CPUidle driver
  ACPI: EC: PM: s2idle: Extend GPE dispatching debug message
  ACPI: PM: s2idle: Print type of wakeup debug messages
  powercap: RAPL: remove unused local MSR define
  PM: runtime: Make clear what we do when conditions are wrong in rpm_suspend()
  Documentation: admin-guide: pm: Document intel-speed-select
  PM: hibernate: Split off snapshot dev option
  PM: hibernate: Incorporate concurrency handling
  Documentation: ABI: make current_governer_ro as a candidate for removal
  ...
This commit is contained in:
Linus Torvalds
2020-06-02 13:17:23 -07:00
parent a5a82e0a59 a34024d98e
commit 355ba37d75
70 changed files with 1830 additions and 727 deletions
Download Patch File Download Diff File Expand all files Collapse all files

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)