Merge tag 'pm-extra-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more power management updates from Rafael Wysocki:
"These add new CPU IDs to a couple of drivers, fix a possible NULL
pointer dereference in the cpuidle core, update DT-related things in
the generic power domains framework and finally update the
suspend/resume infrastructure to improve the handling of wakeups from
suspend-to-idle.

Specifics:

- Add Intel Gemini Lake CPU IDs to the intel_idle and intel_rapl
drivers (David Box).

- Add a NULL pointer check to the cpuidle core to prevent it from
crashing on platforms with incomplete cpuidle configuration (Fei
Li).

- Fix DT-related documentation in the generic power domains (genpd)
framework and add a MAINTAINERS entry for DT-related material in
genpd (Viresh Kumar).

- Update the system suspend/resume infrastructure to improve the
handling of aborts of suspend transitions in progress in the wakeup
framework and rework the suspend-to-idle core loop to make it
possible to filter out spurious wakeup events (specifically the
ones coming from ACPI) without resuming all the way up to user
space every time (Rafael Wysocki)"

* tag 'pm-extra-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI / sleep: Ignore spurious SCI wakeups from suspend-to-idle
PM / wakeup: Integrate mechanism to abort transitions in progress
x86/intel_idle: add Gemini Lake support
cpuidle: check dev before usage in cpuidle_use_deepest_state()
powercap: intel_rapl: Add support for Gemini Lake
PM / Domains: Add DT file to MAINTAINERS
PM / Domains: Fix DT example

Documentation/devicetree/bindings/power/power_domain.txt

···
 	child: power-controller@12341000 {
 		compatible = "foo,power-controller";
 		reg = <0x12341000 0x1000>;
-		power-domains = <&parent 0>;
+		power-domains = <&parent>;
 		#power-domain-cells = <0>;
 		domain-idle-states = <&DOMAIN_PWR_DN>;
 	};

MAINTAINERS

···
 S:	Supported
 F:	drivers/base/power/domain*.c
 F:	include/linux/pm_domain.h
+F:	Documentation/devicetree/bindings/power/power_domain.txt
 
 GENERIC UIO DRIVER FOR PCI DEVICES
 M:	"Michael S. Tsirkin" <[e-mail]>

drivers/acpi/battery.c

···
 	if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
 	    (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
             (battery->capacity_now <= battery->alarm)))
-		pm_wakeup_event(&battery->device->dev, 0);
+		pm_wakeup_hard_event(&battery->device->dev);
 
 	return result;
 }

drivers/acpi/button.c

···
 	}
 
 	if (state)
-		pm_wakeup_event(&device->dev, 0);
+		pm_wakeup_hard_event(&device->dev);
 
 	ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
 	if (ret == NOTIFY_DONE)
···
 		} else {
 			int keycode;
 
-			pm_wakeup_event(&device->dev, 0);
+			pm_wakeup_hard_event(&device->dev);
 			if (button->suspended)
 				break;
 
···
 		lid_device = device;
 	}
 
+	device_init_wakeup(&device->dev, true);
 	printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
 	return 0;
 

drivers/acpi/device_pm.c

···
 #include <linux/pm_qos.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
+#include <linux/suspend.h>
 
 #include "internal.h"
 
···
 	mutex_lock(&acpi_pm_notifier_lock);
 
 	if (adev->wakeup.flags.notifier_present) {
-		__pm_wakeup_event(adev->wakeup.ws, 0);
+		pm_wakeup_ws_event(adev->wakeup.ws, 0, true);
 		if (adev->wakeup.context.work.func)
 			queue_pm_work(&adev->wakeup.context.work);
 	}

drivers/acpi/sleep.c

···
 	acpi_os_wait_events_complete();
 	if (acpi_sci_irq_valid())
 		enable_irq_wake(acpi_sci_irq);
+
 	return 0;
+}
+
+static void acpi_freeze_wake(void)
+{
+	/*
+	 * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
+	 * that the SCI has triggered while suspended, so cancel the wakeup in
+	 * case it has not been a wakeup event (the GPEs will be checked later).
+	 */
+	if (acpi_sci_irq_valid() &&
+	    !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq)))
+		pm_system_cancel_wakeup();
+}
+
+static void acpi_freeze_sync(void)
+{
+	/*
+	 * Process all pending events in case there are any wakeup ones.
+	 *
+	 * The EC driver uses the system workqueue, so that one needs to be
+	 * flushed too.
+	 */
+	acpi_os_wait_events_complete();
+	flush_scheduled_work();
 }
 
 static void acpi_freeze_restore(void)
···
 	acpi_disable_wakeup_devices(ACPI_STATE_S0);
 	if (acpi_sci_irq_valid())
 		disable_irq_wake(acpi_sci_irq);
+
 	acpi_enable_all_runtime_gpes();
 }
 
···
 static const struct platform_freeze_ops acpi_freeze_ops = {
 	.begin = acpi_freeze_begin,
 	.prepare = acpi_freeze_prepare,
+	.wake = acpi_freeze_wake,
+	.sync = acpi_freeze_sync,
 	.restore = acpi_freeze_restore,
 	.end = acpi_freeze_end,
 };

drivers/base/power/main.c

···
 	if (async_error)
 		goto Complete;
 
-	if (pm_wakeup_pending()) {
-		async_error = -EBUSY;
-		goto Complete;
-	}
-
 	if (dev->power.syscore || dev->power.direct_complete)
 		goto Complete;
 

drivers/base/power/wakeup.c

···
 /* First wakeup IRQ seen by the kernel in the last cycle. */
 unsigned int pm_wakeup_irq __read_mostly;
 
-/* If set and the system is suspending, terminate the suspend. */
-static bool pm_abort_suspend __read_mostly;
+/* If greater than 0 and the system is suspending, terminate the suspend. */
+static atomic_t pm_abort_suspend __read_mostly;
 
 /*
  * Combined counters of registered wakeup events and wakeup events in progress.
···
 /**
  * wakup_source_activate - Mark given wakeup source as active.
  * @ws: Wakeup source to handle.
+ * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
  *
  * Update the @ws' statistics and, if @ws has just been activated, notify the PM
  * core of the event by incrementing the counter of of wakeup events being
  * processed.
  */
-static void wakeup_source_activate(struct wakeup_source *ws)
+static void wakeup_source_activate(struct wakeup_source *ws, bool hard)
 {
 	unsigned int cec;
 
···
 			"unregistered wakeup source\n"))
 		return;
 
-	/*
-	 * active wakeup source should bring the system
-	 * out of PM_SUSPEND_FREEZE state
-	 */
-	freeze_wake();
+	if (hard)
+		pm_system_wakeup();
 
 	ws->active = true;
 	ws->active_count++;
···
 /**
  * wakeup_source_report_event - Report wakeup event using the given source.
  * @ws: Wakeup source to report the event for.
+ * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
  */
-static void wakeup_source_report_event(struct wakeup_source *ws)
+static void wakeup_source_report_event(struct wakeup_source *ws, bool hard)
 {
 	ws->event_count++;
 	/* This is racy, but the counter is approximate anyway. */
···
 		ws->wakeup_count++;
 
 	if (!ws->active)
-		wakeup_source_activate(ws);
+		wakeup_source_activate(ws, hard);
 }
 
 /**
···
 
 	spin_lock_irqsave(&ws->lock, flags);
 
-	wakeup_source_report_event(ws);
+	wakeup_source_report_event(ws, false);
 	del_timer(&ws->timer);
 	ws->timer_expires = 0;
 
···
 }
 
 /**
- * __pm_wakeup_event - Notify the PM core of a wakeup event.
+ * pm_wakeup_ws_event - Notify the PM core of a wakeup event.
  * @ws: Wakeup source object associated with the event source.
  * @msec: Anticipated event processing time (in milliseconds).
+ * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
  *
  * Notify the PM core of a wakeup event whose source is @ws that will take
  * approximately @msec milliseconds to be processed by the kernel.  If @ws is
···
  *
  * It is safe to call this function from interrupt context.
  */
-void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec)
+void pm_wakeup_ws_event(struct wakeup_source *ws, unsigned int msec, bool hard)
 {
 	unsigned long flags;
 	unsigned long expires;
···
 
 	spin_lock_irqsave(&ws->lock, flags);
 
-	wakeup_source_report_event(ws);
+	wakeup_source_report_event(ws, hard);
 
 	if (!msec) {
 		wakeup_source_deactivate(ws);
···
  unlock:
 	spin_unlock_irqrestore(&ws->lock, flags);
 }
-EXPORT_SYMBOL_GPL(__pm_wakeup_event);
-
+EXPORT_SYMBOL_GPL(pm_wakeup_ws_event);
 
 /**
  * pm_wakeup_event - Notify the PM core of a wakeup event.
  * @dev: Device the wakeup event is related to.
  * @msec: Anticipated event processing time (in milliseconds).
+ * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
  *
- * Call __pm_wakeup_event() for the @dev's wakeup source object.
+ * Call pm_wakeup_ws_event() for the @dev's wakeup source object.
  */
-void pm_wakeup_event(struct device *dev, unsigned int msec)
+void pm_wakeup_dev_event(struct device *dev, unsigned int msec, bool hard)
 {
 	unsigned long flags;
 
···
 		return;
 
 	spin_lock_irqsave(&dev->power.lock, flags);
-	__pm_wakeup_event(dev->power.wakeup, msec);
+	pm_wakeup_ws_event(dev->power.wakeup, msec, hard);
 	spin_unlock_irqrestore(&dev->power.lock, flags);
 }
-EXPORT_SYMBOL_GPL(pm_wakeup_event);
+EXPORT_SYMBOL_GPL(pm_wakeup_dev_event);
 
 void pm_print_active_wakeup_sources(void)
 {
···
 		pm_print_active_wakeup_sources();
 	}
 
-	return ret || pm_abort_suspend;
+	return ret || atomic_read(&pm_abort_suspend) > 0;
 }
 
 void pm_system_wakeup(void)
 {
-	pm_abort_suspend = true;
+	atomic_inc(&pm_abort_suspend);
 	freeze_wake();
 }
 EXPORT_SYMBOL_GPL(pm_system_wakeup);
 
-void pm_wakeup_clear(void)
+void pm_system_cancel_wakeup(void)
 {
-	pm_abort_suspend = false;
+	atomic_dec(&pm_abort_suspend);
+}
+
+void pm_wakeup_clear(bool reset)
+{
 	pm_wakeup_irq = 0;
+	if (reset)
+		atomic_set(&pm_abort_suspend, 0);
 }
 
 void pm_system_irq_wakeup(unsigned int irq_number)

drivers/cpuidle/cpuidle.c

···
 
 	preempt_disable();
 	dev = cpuidle_get_device();
-	dev->use_deepest_state = enable;
+	if (dev)
+		dev->use_deepest_state = enable;
 	preempt_enable();
 }
 

drivers/idle/intel_idle.c

···
 	ICPU(INTEL_FAM6_XEON_PHI_KNL,		idle_cpu_knl),
 	ICPU(INTEL_FAM6_XEON_PHI_KNM,		idle_cpu_knl),
 	ICPU(INTEL_FAM6_ATOM_GOLDMONT,		idle_cpu_bxt),
+	ICPU(INTEL_FAM6_ATOM_GEMINI_LAKE,	idle_cpu_bxt),
 	ICPU(INTEL_FAM6_ATOM_DENVERTON,		idle_cpu_dnv),
 	{}
 };
···
 		ivt_idle_state_table_update();
 		break;
 	case INTEL_FAM6_ATOM_GOLDMONT:
+	case INTEL_FAM6_ATOM_GEMINI_LAKE:
 		bxt_idle_state_table_update();
 		break;
 	case INTEL_FAM6_SKYLAKE_DESKTOP:

drivers/powercap/intel_rapl.c

···
 	RAPL_CPU(INTEL_FAM6_ATOM_MERRIFIELD,	rapl_defaults_tng),
 	RAPL_CPU(INTEL_FAM6_ATOM_MOOREFIELD,	rapl_defaults_ann),
 	RAPL_CPU(INTEL_FAM6_ATOM_GOLDMONT,	rapl_defaults_core),
+	RAPL_CPU(INTEL_FAM6_ATOM_GEMINI_LAKE,	rapl_defaults_core),
 	RAPL_CPU(INTEL_FAM6_ATOM_DENVERTON,	rapl_defaults_core),
 
 	RAPL_CPU(INTEL_FAM6_XEON_PHI_KNL,	rapl_defaults_hsw_server),

include/linux/pm_wakeup.h

···
 extern void pm_stay_awake(struct device *dev);
 extern void __pm_relax(struct wakeup_source *ws);
 extern void pm_relax(struct device *dev);
-extern void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec);
-extern void pm_wakeup_event(struct device *dev, unsigned int msec);
+extern void pm_wakeup_ws_event(struct wakeup_source *ws, unsigned int msec, bool hard);
+extern void pm_wakeup_dev_event(struct device *dev, unsigned int msec, bool hard);
 
 #else /* !CONFIG_PM_SLEEP */
 
···
 
 static inline void pm_relax(struct device *dev) {}
 
-static inline void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec) {}
+static inline void pm_wakeup_ws_event(struct wakeup_source *ws,
+				      unsigned int msec, bool hard) {}
 
-static inline void pm_wakeup_event(struct device *dev, unsigned int msec) {}
+static inline void pm_wakeup_dev_event(struct device *dev, unsigned int msec,
+				       bool hard) {}
 
 #endif /* !CONFIG_PM_SLEEP */
 
···
 {
 	wakeup_source_remove(ws);
 	wakeup_source_drop(ws);
+}
+
+static inline void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec)
+{
+	return pm_wakeup_ws_event(ws, msec, false);
+}
+
+static inline void pm_wakeup_event(struct device *dev, unsigned int msec)
+{
+	return pm_wakeup_dev_event(dev, msec, false);
+}
+
+static inline void pm_wakeup_hard_event(struct device *dev)
+{
+	return pm_wakeup_dev_event(dev, 0, true);
 }
 
 #endif /* _LINUX_PM_WAKEUP_H */

include/linux/suspend.h

···
 struct platform_freeze_ops {
 	int (*begin)(void);
 	int (*prepare)(void);
+	void (*wake)(void);
+	void (*sync)(void);
 	void (*restore)(void);
 	void (*end)(void);
 };
···
 
 extern bool pm_wakeup_pending(void);
 extern void pm_system_wakeup(void);
-extern void pm_wakeup_clear(void);
+extern void pm_system_cancel_wakeup(void);
+extern void pm_wakeup_clear(bool reset);
 extern void pm_system_irq_wakeup(unsigned int irq_number);
 extern bool pm_get_wakeup_count(unsigned int *count, bool block);
 extern bool pm_save_wakeup_count(unsigned int count);
···
 
 static inline bool pm_wakeup_pending(void) { return false; }
 static inline void pm_system_wakeup(void) {}
-static inline void pm_wakeup_clear(void) {}
+static inline void pm_wakeup_clear(bool reset) {}
 static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
 
 static inline void lock_system_sleep(void) {}

kernel/power/process.c

···
 	if (!pm_freezing)
 		atomic_inc(&system_freezing_cnt);
 
-	pm_wakeup_clear();
+	pm_wakeup_clear(true);
 	pr_info("Freezing user space processes ... ");
 	pm_freezing = true;
 	error = try_to_freeze_tasks(true);

kernel/power/suspend.c

···
 
 static void freeze_enter(void)
 {
+	trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_FREEZE, true);
+
 	spin_lock_irq(&suspend_freeze_lock);
 	if (pm_wakeup_pending())
 		goto out;
···
  out:
 	suspend_freeze_state = FREEZE_STATE_NONE;
 	spin_unlock_irq(&suspend_freeze_lock);
+
+	trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_FREEZE, false);
+}
+
+static void s2idle_loop(void)
+{
+	do {
+		freeze_enter();
+
+		if (freeze_ops && freeze_ops->wake)
+			freeze_ops->wake();
+
+		dpm_resume_noirq(PMSG_RESUME);
+		if (freeze_ops && freeze_ops->sync)
+			freeze_ops->sync();
+
+		if (pm_wakeup_pending())
+			break;
+
+		pm_wakeup_clear(false);
+	} while (!dpm_suspend_noirq(PMSG_SUSPEND));
 }
 
 void freeze_wake(void)
···
 	 * all the devices are suspended.
 	 */
 	if (state == PM_SUSPEND_FREEZE) {
-		trace_suspend_resume(TPS("machine_suspend"), state, true);
-		freeze_enter();
-		trace_suspend_resume(TPS("machine_suspend"), state, false);
-		goto Platform_wake;
+		s2idle_loop();
+		goto Platform_early_resume;
 	}
 
 	error = disable_nonboot_cpus();