Merge branches 'pm-sleep' and 'pm-domains'

* pm-sleep:
  PM / watchdog: iTCO: stop watchdog during system suspend
  PM / sleep: add pm-trace support for suspending phase
  PM / sleep: add configurable delay for pm_test

* pm-domains:
  PM / domains: avoid potential oops in pm_genpd_remove_device()
  PM / domains: factor out code to get the generic PM domain from a struct device
  PM / domains: quieten down generic pm domains
  PM / Domains: Sync runtime PM status with genpd after probe
  driver core / PM: Add PM domain callbacks for device setup/cleanup
  MAINTAINERS: add entry for Generic PM domains (genpd)

Documentation/kernel-parameters.txt

@@ -3462,6 +3462,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			improve throughput, but will also increase the
 			amount of memory reserved for use by the client.
 
+	suspend.pm_test_delay=
+			[SUSPEND]
+			Sets the number of seconds to remain in a suspend test
+			mode before resuming the system (see
+			/sys/power/pm_test). Only available when CONFIG_PM_DEBUG
+			is set. Default value is 5.
+
 	swapaccount=[0|1]
 			[KNL] Enable accounting of swap in memory resource
 			controller if no parameter or 1 is given or disable

Documentation/power/basic-pm-debugging.txt

@@ -75,12 +75,14 @@ you should do the following:
 # echo platform > /sys/power/disk
 # echo disk > /sys/power/state
 
-Then, the kernel will try to freeze processes, suspend devices, wait 5 seconds,
-resume devices and thaw processes.  If "platform" is written to
+Then, the kernel will try to freeze processes, suspend devices, wait a few
+seconds (5 by default, but configurable by the suspend.pm_test_delay module
+parameter), resume devices and thaw processes.  If "platform" is written to
 /sys/power/pm_test , then after suspending devices the kernel will additionally
 invoke the global control methods (eg. ACPI global control methods) used to
-prepare the platform firmware for hibernation.  Next, it will wait 5 seconds and
-invoke the platform (eg. ACPI) global methods used to cancel hibernation etc.
+prepare the platform firmware for hibernation.  Next, it will wait a
+configurable number of seconds and invoke the platform (eg. ACPI) global
+methods used to cancel hibernation etc.
 
 Writing "none" to /sys/power/pm_test causes the kernel to switch to the normal
 hibernation/suspend operations.  Also, when open for reading, /sys/power/pm_test

MAINTAINERS

@@ -4312,6 +4312,15 @@ S:	Supported
 F:	drivers/phy/
 F:	include/linux/phy/
 
+GENERIC PM DOMAINS
+M:	"Rafael J. Wysocki" <rjw@rjwysocki.net>
+M:	Kevin Hilman <khilman@kernel.org>
+M:	Ulf Hansson <ulf.hansson@linaro.org>
+L:	linux-pm@vger.kernel.org
+S:	Supported
+F:	drivers/base/power/domain*.c
+F:	include/linux/pm_domain.h
+
 GENERIC UIO DRIVER FOR PCI DEVICES
 M:	"Michael S. Tsirkin" <mst@redhat.com>
 L:	kvm@vger.kernel.org

arch/x86/include/asm/resume-trace.h → arch/x86/include/asm/pm-trace.h

@@ -1,5 +1,5 @@
-#ifndef _ASM_X86_RESUME_TRACE_H
-#define _ASM_X86_RESUME_TRACE_H
+#ifndef _ASM_X86_PM_TRACE_H
+#define _ASM_X86_PM_TRACE_H
 
 #include <asm/asm.h>
 
@@ -14,8 +14,10 @@ do {								\
 			     ".previous"			\
 			     :"=r" (tracedata)			\
 			     : "i" (__LINE__), "i" (__FILE__));	\
-		generate_resume_trace(tracedata, user);		\
+		generate_pm_trace(tracedata, user);		\
 	}							\
 } while (0)
 
-#endif /* _ASM_X86_RESUME_TRACE_H */
+#define TRACE_SUSPEND(user)	TRACE_RESUME(user)
+
+#endif /* _ASM_X86_PM_TRACE_H */

drivers/base/dd.c

@@ -298,6 +298,12 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		goto probe_failed;
 	}
 
+	if (dev->pm_domain && dev->pm_domain->activate) {
+		ret = dev->pm_domain->activate(dev);
+		if (ret)
+			goto probe_failed;
+	}
+
 	if (dev->bus->probe) {
 		ret = dev->bus->probe(dev);
 		if (ret)
@@ -308,6 +314,9 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 			goto probe_failed;
 	}
 
+	if (dev->pm_domain && dev->pm_domain->sync)
+		dev->pm_domain->sync(dev);
+
 	driver_bound(dev);
 	ret = 1;
 	pr_debug("bus: '%s': %s: bound device %s to driver %s\n",
@@ -319,6 +328,8 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 	driver_sysfs_remove(dev);
 	dev->driver = NULL;
 	dev_set_drvdata(dev, NULL);
+	if (dev->pm_domain && dev->pm_domain->dismiss)
+		dev->pm_domain->dismiss(dev);
 
 	if (ret == -EPROBE_DEFER) {
 		/* Driver requested deferred probing */
@@ -525,6 +536,9 @@ static void __device_release_driver(struct device *dev)
 		devres_release_all(dev);
 		dev->driver = NULL;
 		dev_set_drvdata(dev, NULL);
+		if (dev->pm_domain && dev->pm_domain->dismiss)
+			dev->pm_domain->dismiss(dev);
+
 		klist_remove(&dev->p->knode_driver);
 		if (dev->bus)
 			blocking_notifier_call_chain(&dev->bus->p->bus_notifier,

drivers/base/power/domain.c

@@ -68,7 +68,36 @@ static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name)
 	return genpd;
 }
 
-struct generic_pm_domain *dev_to_genpd(struct device *dev)
+/*
+ * Get the generic PM domain for a particular struct device.
+ * This validates the struct device pointer, the PM domain pointer,
+ * and checks that the PM domain pointer is a real generic PM domain.
+ * Any failure results in NULL being returned.
+ */
+struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
+{
+	struct generic_pm_domain *genpd = NULL, *gpd;
+
+	if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
+		return NULL;
+
+	mutex_lock(&gpd_list_lock);
+	list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
+		if (&gpd->domain == dev->pm_domain) {
+			genpd = gpd;
+			break;
+		}
+	}
+	mutex_unlock(&gpd_list_lock);
+
+	return genpd;
+}
+
+/*
+ * This should only be used where we are certain that the pm_domain
+ * attached to the device is a genpd domain.
+ */
+static struct generic_pm_domain *dev_to_genpd(struct device *dev)
 {
 	if (IS_ERR_OR_NULL(dev->pm_domain))
 		return ERR_PTR(-EINVAL);
@@ -173,8 +202,8 @@ static int genpd_power_on(struct generic_pm_domain *genpd)
 	genpd->power_on_latency_ns = elapsed_ns;
 	genpd->max_off_time_changed = true;
 	genpd_recalc_cpu_exit_latency(genpd);
-	pr_warn("%s: Power-%s latency exceeded, new value %lld ns\n",
-		genpd->name, "on", elapsed_ns);
+	pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
+		 genpd->name, "on", elapsed_ns);
 
 	return ret;
 }
@@ -199,8 +228,8 @@ static int genpd_power_off(struct generic_pm_domain *genpd)
 
 	genpd->power_off_latency_ns = elapsed_ns;
 	genpd->max_off_time_changed = true;
-	pr_warn("%s: Power-%s latency exceeded, new value %lld ns\n",
-		genpd->name, "off", elapsed_ns);
+	pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
+		 genpd->name, "off", elapsed_ns);
 
 	return ret;
 }
@@ -1513,9 +1542,7 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 
 	dev_dbg(dev, "%s()\n", __func__);
 
-	if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)
-	    ||  IS_ERR_OR_NULL(dev->pm_domain)
-	    ||  pd_to_genpd(dev->pm_domain) != genpd)
+	if (!genpd || genpd != pm_genpd_lookup_dev(dev))
 		return -EINVAL;
 
 	/* The above validation also means we have existing domain_data. */
@@ -2093,21 +2120,10 @@ EXPORT_SYMBOL_GPL(of_genpd_get_from_provider);
  */
 static void genpd_dev_pm_detach(struct device *dev, bool power_off)
 {
-	struct generic_pm_domain *pd = NULL, *gpd;
+	struct generic_pm_domain *pd;
 	int ret = 0;
 
-	if (!dev->pm_domain)
-		return;
-
-	mutex_lock(&gpd_list_lock);
-	list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
-		if (&gpd->domain == dev->pm_domain) {
-			pd = gpd;
-			break;
-		}
-	}
-	mutex_unlock(&gpd_list_lock);
-
+	pd = pm_genpd_lookup_dev(dev);
 	if (!pd)
 		return;
 
@@ -2130,6 +2146,17 @@ static void genpd_dev_pm_detach(struct device *dev, bool power_off)
 	genpd_queue_power_off_work(pd);
 }
 
+static void genpd_dev_pm_sync(struct device *dev)
+{
+	struct generic_pm_domain *pd;
+
+	pd = dev_to_genpd(dev);
+	if (IS_ERR(pd))
+		return;
+
+	genpd_queue_power_off_work(pd);
+}
+
 /**
  * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
  * @dev: Device to attach.
@@ -2196,6 +2223,7 @@ int genpd_dev_pm_attach(struct device *dev)
 	}
 
 	dev->pm_domain->detach = genpd_dev_pm_detach;
+	dev->pm_domain->sync = genpd_dev_pm_sync;
 	pm_genpd_poweron(pd);
 
 	return 0;

drivers/base/power/main.c

@@ -23,7 +23,7 @@
 #include <linux/mutex.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
-#include <linux/resume-trace.h>
+#include <linux/pm-trace.h>
 #include <linux/interrupt.h>
 #include <linux/sched.h>
 #include <linux/async.h>
@@ -1017,6 +1017,9 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a
 	char *info = NULL;
 	int error = 0;
 
+	TRACE_DEVICE(dev);
+	TRACE_SUSPEND(0);
+
 	if (async_error)
 		goto Complete;
 
@@ -1057,6 +1060,7 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a
 
 Complete:
 	complete_all(&dev->power.completion);
+	TRACE_SUSPEND(error);
 	return error;
 }
 
@@ -1078,7 +1082,7 @@ static int device_suspend_noirq(struct device *dev)
 {
 	reinit_completion(&dev->power.completion);
 
-	if (pm_async_enabled && dev->power.async_suspend) {
+	if (is_async(dev)) {
 		get_device(dev);
 		async_schedule(async_suspend_noirq, dev);
 		return 0;
@@ -1157,6 +1161,9 @@ static int __device_suspend_late(struct device *dev, pm_message_t state, bool as
 	char *info = NULL;
 	int error = 0;
 
+	TRACE_DEVICE(dev);
+	TRACE_SUSPEND(0);
+
 	__pm_runtime_disable(dev, false);
 
 	if (async_error)
@@ -1198,6 +1205,7 @@ static int __device_suspend_late(struct device *dev, pm_message_t state, bool as
 		async_error = error;
 
 Complete:
+	TRACE_SUSPEND(error);
 	complete_all(&dev->power.completion);
 	return error;
 }
@@ -1219,7 +1227,7 @@ static int device_suspend_late(struct device *dev)
 {
 	reinit_completion(&dev->power.completion);
 
-	if (pm_async_enabled && dev->power.async_suspend) {
+	if (is_async(dev)) {
 		get_device(dev);
 		async_schedule(async_suspend_late, dev);
 		return 0;
@@ -1338,6 +1346,9 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 	int error = 0;
 	DECLARE_DPM_WATCHDOG_ON_STACK(wd);
 
+	TRACE_DEVICE(dev);
+	TRACE_SUSPEND(0);
+
 	dpm_wait_for_children(dev, async);
 
 	if (async_error)
@@ -1444,6 +1455,7 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 	if (error)
 		async_error = error;
 
+	TRACE_SUSPEND(error);
 	return error;
 }
 
@@ -1465,7 +1477,7 @@ static int device_suspend(struct device *dev)
 {
 	reinit_completion(&dev->power.completion);
 
-	if (pm_async_enabled && dev->power.async_suspend) {
+	if (is_async(dev)) {
 		get_device(dev);
 		async_schedule(async_suspend, dev);
 		return 0;

drivers/base/power/trace.c

@@ -7,7 +7,7 @@
  * devices may be working.
  */
 
-#include <linux/resume-trace.h>
+#include <linux/pm-trace.h>
 #include <linux/export.h>
 #include <linux/rtc.h>
 
@@ -154,7 +154,7 @@ EXPORT_SYMBOL(set_trace_device);
  * it's not any guarantee, but it's a high _likelihood_ that
  * the match is valid).
  */
-void generate_resume_trace(const void *tracedata, unsigned int user)
+void generate_pm_trace(const void *tracedata, unsigned int user)
 {
 	unsigned short lineno = *(unsigned short *)tracedata;
 	const char *file = *(const char **)(tracedata + 2);
@@ -164,7 +164,7 @@ void generate_resume_trace(const void *tracedata, unsigned int user)
 	file_hash_value = hash_string(lineno, file, FILEHASH);
 	set_magic_time(user_hash_value, file_hash_value, dev_hash_value);
 }
-EXPORT_SYMBOL(generate_resume_trace);
+EXPORT_SYMBOL(generate_pm_trace);
 
 extern char __tracedata_start, __tracedata_end;
 static int show_file_hash(unsigned int value)