Merge tag 'pm-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management updates from Rafael Wysocki:
 "These fix the (Intel-specific) Performance and Energy Bias Hint (EPB)
  handling and expose it to user space via sysfs, fix and clean up
  several cpufreq drivers, add support for two new chips to the qoriq
  cpufreq driver, fix, simplify and clean up the cpufreq core and the
  schedutil governor, add support for "CPU" domains to the generic power
  domains (genpd) framework and provide low-level PSCI firmware support
  for that feature, fix the exynos cpuidle driver and fix a couple of
  issues in the devfreq subsystem and clean it up.

  Specifics:

   - Fix the handling of Performance and Energy Bias Hint (EPB) on Intel
     processors and expose it to user space via sysfs to avoid having to
     access it through the generic MSR I/F (Rafael Wysocki).

   - Improve the handling of global turbo changes made by the platform
     firmware in the intel_pstate driver (Rafael Wysocki).

   - Convert some slow-path static_cpu_has() callers to boot_cpu_has()
     in cpufreq (Borislav Petkov).

   - Fix the frequency calculation loop in the armada-37xx cpufreq
     driver (Gregory CLEMENT).

   - Fix possible object reference leaks in multuple cpufreq drivers
     (Wen Yang).

   - Fix kerneldoc comment in the centrino cpufreq driver (dongjian).

   - Clean up the ACPI and maple cpufreq drivers (Viresh Kumar, Mohan
     Kumar).

   - Add support for lx2160a and ls1028a to the qoriq cpufreq driver
     (Vabhav Sharma, Yuantian Tang).

   - Fix kobject memory leak in the cpufreq core (Viresh Kumar).

   - Simplify the IOwait boosting in the schedutil cpufreq governor and
     rework the TSC cpufreq notifier on x86 (Rafael Wysocki).

   - Clean up the cpufreq core and statistics code (Yue Hu, Kyle Lin).

   - Improve the cpufreq documentation, add SPDX license tags to some PM
     documentation files and unify copyright notices in them (Rafael
     Wysocki).

   - Add support for "CPU" domains to the generic power domains (genpd)
     framework and provide low-level PSCI firmware support for that
     feature (Ulf Hansson).

   - Rearrange the PSCI firmware support code and add support for
     SYSTEM_RESET2 to it (Ulf Hansson, Sudeep Holla).

   - Improve genpd support for devices in multiple power domains (Ulf
     Hansson).

   - Unify target residency for the AFTR and coupled AFTR states in the
     exynos cpuidle driver (Marek Szyprowski).

   - Introduce new helper routine in the operating performance points
     (OPP) framework (Andrew-sh.Cheng).

   - Add support for passing on-die termination (ODT) and auto power
     down parameters from the kernel to Trusted Firmware-A (TF-A) to the
     rk3399_dmc devfreq driver (Enric Balletbo i Serra).

   - Add tracing to devfreq (Lukasz Luba).

   - Make the exynos-bus devfreq driver suspend all devices on system
     shutdown (Marek Szyprowski).

   - Fix a few minor issues in the devfreq subsystem and clean it up
     somewhat (Enric Balletbo i Serra, MyungJoo Ham, Rob Herring,
     Saravana Kannan, Yangtao Li).

   - Improve system wakeup diagnostics (Stephen Boyd).

   - Rework filesystem sync messages emitted during system suspend and
     hibernation (Harry Pan)"

* tag 'pm-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (72 commits)
  cpufreq: Fix kobject memleak
  cpufreq: armada-37xx: fix frequency calculation for opp
  cpufreq: centrino: Fix centrino_setpolicy() kerneldoc comment
  cpufreq: qoriq: add support for lx2160a
  x86: tsc: Rework time_cpufreq_notifier()
  PM / Domains: Allow to attach a CPU via genpd_dev_pm_attach_by_id|name()
  PM / Domains: Search for the CPU device outside the genpd lock
  PM / Domains: Drop unused in-parameter to some genpd functions
  PM / Domains: Use the base device for driver_deferred_probe_check_state()
  cpufreq: qoriq: Add ls1028a chip support
  PM / Domains: Enable genpd_dev_pm_attach_by_id|name() for single PM domain
  PM / Domains: Allow OF lookup for multi PM domain case from ->attach_dev()
  PM / Domains: Don't kfree() the virtual device in the error path
  cpufreq: Move ->get callback check outside of __cpufreq_get()
  PM / Domains: remove unnecessary unlikely()
  cpufreq: Remove needless bios_limit check in show_bios_limit()
  drivers/cpufreq/acpi-cpufreq.c: This fixes the following checkpatch warning
  firmware/psci: add support for SYSTEM_RESET2
  PM / devfreq: add tracing for scheduling work
  trace: events: add devfreq trace event file
  ...

1 files changed, 59 insertions, 31 deletions

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 0ae3de76833b..6b6991f0e873 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -29,6 +29,9 @@
 #include <linux/of.h>
 #include "governor.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/devfreq.h>
+
 static struct class *devfreq_class;
 
 /*
@@ -228,7 +231,7 @@ static struct devfreq_governor *find_devfreq_governor(const char *name)
  * if is not found. This can happen when both drivers (the governor driver
  * and the driver that call devfreq_add_device) are built as modules.
  * devfreq_list_lock should be held by the caller. Returns the matched
- * governor's pointer.
+ * governor's pointer or an error pointer.
  */
 static struct devfreq_governor *try_then_request_governor(const char *name)
 {
@@ -254,7 +257,7 @@ static struct devfreq_governor *try_then_request_governor(const char *name)
 		/* Restore previous state before return */
 		mutex_lock(&devfreq_list_lock);
 		if (err)
-			return NULL;
+			return ERR_PTR(err);
 
 		governor = find_devfreq_governor(name);
 	}
@@ -394,6 +397,8 @@ static void devfreq_monitor(struct work_struct *work)
 	queue_delayed_work(devfreq_wq, &devfreq->work,
 				msecs_to_jiffies(devfreq->profile->polling_ms));
 	mutex_unlock(&devfreq->lock);
+
+	trace_devfreq_monitor(devfreq);
 }
 
 /**
@@ -528,7 +533,7 @@ void devfreq_interval_update(struct devfreq *devfreq, unsigned int *delay)
 		mutex_lock(&devfreq->lock);
 		if (!devfreq->stop_polling)
 			queue_delayed_work(devfreq_wq, &devfreq->work,
-			      msecs_to_jiffies(devfreq->profile->polling_ms));
+				msecs_to_jiffies(devfreq->profile->polling_ms));
 	}
 out:
 	mutex_unlock(&devfreq->lock);
@@ -537,7 +542,7 @@ EXPORT_SYMBOL(devfreq_interval_update);
 
 /**
  * devfreq_notifier_call() - Notify that the device frequency requirements
- *			   has been changed out of devfreq framework.
+ *			     has been changed out of devfreq framework.
  * @nb:		the notifier_block (supposed to be devfreq->nb)
  * @type:	not used
  * @devp:	not used
@@ -651,7 +656,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
 		mutex_unlock(&devfreq->lock);
 		err = set_freq_table(devfreq);
 		if (err < 0)
-			goto err_out;
+			goto err_dev;
 		mutex_lock(&devfreq->lock);
 	}
 
@@ -683,16 +688,27 @@ struct devfreq *devfreq_add_device(struct device *dev,
 		goto err_out;
 	}
 
-	devfreq->trans_table =
-		devm_kzalloc(&devfreq->dev,
-			     array3_size(sizeof(unsigned int),
-					 devfreq->profile->max_state,
-					 devfreq->profile->max_state),
-			     GFP_KERNEL);
+	devfreq->trans_table = devm_kzalloc(&devfreq->dev,
+			array3_size(sizeof(unsigned int),
+				    devfreq->profile->max_state,
+				    devfreq->profile->max_state),
+			GFP_KERNEL);
+	if (!devfreq->trans_table) {
+		mutex_unlock(&devfreq->lock);
+		err = -ENOMEM;
+		goto err_devfreq;
+	}
+
 	devfreq->time_in_state = devm_kcalloc(&devfreq->dev,
-						devfreq->profile->max_state,
-						sizeof(unsigned long),
-						GFP_KERNEL);
+			devfreq->profile->max_state,
+			sizeof(unsigned long),
+			GFP_KERNEL);
+	if (!devfreq->time_in_state) {
+		mutex_unlock(&devfreq->lock);
+		err = -ENOMEM;
+		goto err_devfreq;
+	}
+
 	devfreq->last_stat_updated = jiffies;
 
 	srcu_init_notifier_head(&devfreq->transition_notifier_list);
@@ -726,7 +742,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
 
 err_init:
 	mutex_unlock(&devfreq_list_lock);
-
+err_devfreq:
 	devfreq_remove_device(devfreq);
 	devfreq = NULL;
 err_dev:
@@ -1113,7 +1129,7 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
 	struct devfreq *df = to_devfreq(dev);
 	int ret;
 	char str_governor[DEVFREQ_NAME_LEN + 1];
-	struct devfreq_governor *governor;
+	const struct devfreq_governor *governor, *prev_governor;
 
 	ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor);
 	if (ret != 1)
@@ -1142,12 +1158,24 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
 			goto out;
 		}
 	}
+	prev_governor = df->governor;
 	df->governor = governor;
 	strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN);
 	ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
-	if (ret)
+	if (ret) {
 		dev_warn(dev, "%s: Governor %s not started(%d)\n",
 			 __func__, df->governor->name, ret);
+		df->governor = prev_governor;
+		strncpy(df->governor_name, prev_governor->name,
+			DEVFREQ_NAME_LEN);
+		ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
+		if (ret) {
+			dev_err(dev,
+				"%s: reverting to Governor %s failed (%d)\n",
+				__func__, df->governor_name, ret);
+			df->governor = NULL;
+		}
+	}
 out:
 	mutex_unlock(&devfreq_list_lock);
 
@@ -1172,7 +1200,7 @@ static ssize_t available_governors_show(struct device *d,
 	 */
 	if (df->governor->immutable) {
 		count = scnprintf(&buf[count], DEVFREQ_NAME_LEN,
-				   "%s ", df->governor_name);
+				  "%s ", df->governor_name);
 	/*
 	 * The devfreq device shows the registered governor except for
 	 * immutable governors such as passive governor .
@@ -1485,8 +1513,8 @@ EXPORT_SYMBOL(devfreq_recommended_opp);
 
 /**
  * devfreq_register_opp_notifier() - Helper function to get devfreq notified
- *				   for any changes in the OPP availability
- *				   changes
+ *				     for any changes in the OPP availability
+ *				     changes
  * @dev:	The devfreq user device. (parent of devfreq)
  * @devfreq:	The devfreq object.
  */
@@ -1498,8 +1526,8 @@ EXPORT_SYMBOL(devfreq_register_opp_notifier);
 
 /**
  * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq
- *				     notified for any changes in the OPP
- *				     availability changes anymore.
+ *				       notified for any changes in the OPP
+ *				       availability changes anymore.
  * @dev:	The devfreq user device. (parent of devfreq)
  * @devfreq:	The devfreq object.
  *
@@ -1518,8 +1546,8 @@ static void devm_devfreq_opp_release(struct device *dev, void *res)
 }
 
 /**
- * devm_ devfreq_register_opp_notifier()
- *		- Resource-managed devfreq_register_opp_notifier()
+ * devm_devfreq_register_opp_notifier() - Resource-managed
+ *					  devfreq_register_opp_notifier()
  * @dev:	The devfreq user device. (parent of devfreq)
  * @devfreq:	The devfreq object.
  */
@@ -1547,8 +1575,8 @@ int devm_devfreq_register_opp_notifier(struct device *dev,
 EXPORT_SYMBOL(devm_devfreq_register_opp_notifier);
 
 /**
- * devm_devfreq_unregister_opp_notifier()
- *		- Resource-managed devfreq_unregister_opp_notifier()
+ * devm_devfreq_unregister_opp_notifier() - Resource-managed
+ *					    devfreq_unregister_opp_notifier()
  * @dev:	The devfreq user device. (parent of devfreq)
  * @devfreq:	The devfreq object.
  */
@@ -1567,8 +1595,8 @@ EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier);
  * @list:	DEVFREQ_TRANSITION_NOTIFIER.
  */
 int devfreq_register_notifier(struct devfreq *devfreq,
-				struct notifier_block *nb,
-				unsigned int list)
+			      struct notifier_block *nb,
+			      unsigned int list)
 {
 	int ret = 0;
 
@@ -1674,9 +1702,9 @@ EXPORT_SYMBOL(devm_devfreq_register_notifier);
  * @list:	DEVFREQ_TRANSITION_NOTIFIER.
  */
 void devm_devfreq_unregister_notifier(struct device *dev,
-				struct devfreq *devfreq,
-				struct notifier_block *nb,
-				unsigned int list)
+				      struct devfreq *devfreq,
+				      struct notifier_block *nb,
+				      unsigned int list)
 {
 	WARN_ON(devres_release(dev, devm_devfreq_notifier_release,
 			       devm_devfreq_dev_match, devfreq));