Merge branches 'pm-domains' and 'pm-tools'

Additional updates of the generic power domains (genpd) framework
(support for devices attached to multiple domains) and the cpupower
utility (minor fixes) for 4.18-rc1.

* pm-domains:
  PM / Domains: Add dev_pm_domain_attach_by_id() to manage multi PM domains
  PM / Domains: Add support for multi PM domains per device to genpd
  PM / Domains: Split genpd_dev_pm_attach()
  PM / Domains: Don't attach devices in genpd with multi PM domains
  PM / Domains: dt: Allow power-domain property to be a list of specifiers

* pm-tools:
  cpupower : Fix header name to read idle state name
  cpupower: fix spelling mistake: "logilename" -> "logfilename"

Author: rafaeljw

Documentation/devicetree/bindings/power/power_domain.txt

@@ -111,8 +111,8 @@ Example 3:
 ==PM domain consumers==
 
 Required properties:
- - power-domains : A phandle and PM domain specifier as defined by bindings of
-                   the power controller specified by phandle.
+ - power-domains : A list of PM domain specifiers, as defined by bindings of
+		the power controller that is the PM domain provider.
 
 Example:
 
@@ -122,9 +122,18 @@ Example:
 		power-domains = <&power 0>;
 	};
 
-The node above defines a typical PM domain consumer device, which is located
-inside a PM domain with index 0 of a power controller represented by a node
-with the label "power".
+	leaky-device@12351000 {
+		compatible = "foo,i-leak-current";
+		reg = <0x12351000 0x1000>;
+		power-domains = <&power 0>, <&power 1> ;
+	};
+
+The first example above defines a typical PM domain consumer device, which is
+located inside a PM domain with index 0 of a power controller represented by a
+node with the label "power".
+In the second example the consumer device are partitioned across two PM domains,
+the first with index 0 and the second with index 1, of a power controller that
+is represented by a node with the label "power.
 
 Optional properties:
 - required-opps: This contains phandle to an OPP node in another device's OPP

drivers/base/power/common.c

@@ -116,14 +116,51 @@ int dev_pm_domain_attach(struct device *dev, bool power_on)
 }
 EXPORT_SYMBOL_GPL(dev_pm_domain_attach);
 
+/**
+ * dev_pm_domain_attach_by_id - Associate a device with one of its PM domains.
+ * @dev: The device used to lookup the PM domain.
+ * @index: The index of the PM domain.
+ *
+ * As @dev may only be attached to a single PM domain, the backend PM domain
+ * provider creates a virtual device to attach instead. If attachment succeeds,
+ * the ->detach() callback in the struct dev_pm_domain are assigned by the
+ * corresponding backend attach function, as to deal with detaching of the
+ * created virtual device.
+ *
+ * This function should typically be invoked by a driver during the probe phase,
+ * in case its device requires power management through multiple PM domains. The
+ * driver may benefit from using the received device, to configure device-links
+ * towards its original device. Depending on the use-case and if needed, the
+ * links may be dynamically changed by the driver, which allows it to control
+ * the power to the PM domains independently from each other.
+ *
+ * Callers must ensure proper synchronization of this function with power
+ * management callbacks.
+ *
+ * Returns the virtual created device when successfully attached to its PM
+ * domain, NULL in case @dev don't need a PM domain, else an ERR_PTR().
+ * Note that, to detach the returned virtual device, the driver shall call
+ * dev_pm_domain_detach() on it, typically during the remove phase.
+ */
+struct device *dev_pm_domain_attach_by_id(struct device *dev,
+					  unsigned int index)
+{
+	if (dev->pm_domain)
+		return ERR_PTR(-EEXIST);
+
+	return genpd_dev_pm_attach_by_id(dev, index);
+}
+EXPORT_SYMBOL_GPL(dev_pm_domain_attach_by_id);
+
 /**
  * dev_pm_domain_detach - Detach a device from its PM domain.
  * @dev: Device to detach.
  * @power_off: Used to indicate whether we should power off the device.
  *
- * This functions will reverse the actions from dev_pm_domain_attach() and thus
- * try to detach the @dev from its PM domain. Typically it should be invoked
- * from subsystem level code during the remove phase.
+ * This functions will reverse the actions from dev_pm_domain_attach() and
+ * dev_pm_domain_attach_by_id(), thus it detaches @dev from its PM domain.
+ * Typically it should be invoked during the remove phase, either from
+ * subsystem level code or from drivers.
  *
  * Callers must ensure proper synchronization of this function with power
  * management callbacks.

drivers/base/power/domain.c

@@ -2171,6 +2171,15 @@ struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
 }
 EXPORT_SYMBOL_GPL(of_genpd_remove_last);
 
+static void genpd_release_dev(struct device *dev)
+{
+	kfree(dev);
+}
+
+static struct bus_type genpd_bus_type = {
+	.name		= "genpd",
+};
+
 /**
  * genpd_dev_pm_detach - Detach a device from its PM domain.
  * @dev: Device to detach.
@@ -2208,6 +2217,10 @@ static void genpd_dev_pm_detach(struct device *dev, bool power_off)
 
 	/* Check if PM domain can be powered off after removing this device. */
 	genpd_queue_power_off_work(pd);
+
+	/* Unregister the device if it was created by genpd. */
+	if (dev->bus == &genpd_bus_type)
+		device_unregister(dev);
 }
 
 static void genpd_dev_pm_sync(struct device *dev)
@@ -2221,32 +2234,17 @@ static void genpd_dev_pm_sync(struct device *dev)
 	genpd_queue_power_off_work(pd);
 }
 
-/**
- * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
- * @dev: Device to attach.
- *
- * Parse device's OF node to find a PM domain specifier. If such is found,
- * attaches the device to retrieved pm_domain ops.
- *
- * Returns 1 on successfully attached PM domain, 0 when the device don't need a
- * PM domain or a negative error code in case of failures. Note that if a
- * power-domain exists for the device, but it cannot be found or turned on,
- * then return -EPROBE_DEFER to ensure that the device is not probed and to
- * re-try again later.
- */
-int genpd_dev_pm_attach(struct device *dev)
+static int __genpd_dev_pm_attach(struct device *dev, struct device_node *np,
+				 unsigned int index)
 {
 	struct of_phandle_args pd_args;
 	struct generic_pm_domain *pd;
 	int ret;
 
-	if (!dev->of_node)
-		return 0;
-
-	ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
-					"#power-domain-cells", 0, &pd_args);
+	ret = of_parse_phandle_with_args(np, "power-domains",
+				"#power-domain-cells", index, &pd_args);
 	if (ret < 0)
-		return 0;
+		return ret;
 
 	mutex_lock(&gpd_list_lock);
 	pd = genpd_get_from_provider(&pd_args);
@@ -2282,8 +2280,98 @@ int genpd_dev_pm_attach(struct device *dev)
 
 	return ret ? -EPROBE_DEFER : 1;
 }
+
+/**
+ * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
+ * @dev: Device to attach.
+ *
+ * Parse device's OF node to find a PM domain specifier. If such is found,
+ * attaches the device to retrieved pm_domain ops.
+ *
+ * Returns 1 on successfully attached PM domain, 0 when the device don't need a
+ * PM domain or when multiple power-domains exists for it, else a negative error
+ * code. Note that if a power-domain exists for the device, but it cannot be
+ * found or turned on, then return -EPROBE_DEFER to ensure that the device is
+ * not probed and to re-try again later.
+ */
+int genpd_dev_pm_attach(struct device *dev)
+{
+	if (!dev->of_node)
+		return 0;
+
+	/*
+	 * Devices with multiple PM domains must be attached separately, as we
+	 * can only attach one PM domain per device.
+	 */
+	if (of_count_phandle_with_args(dev->of_node, "power-domains",
+				       "#power-domain-cells") != 1)
+		return 0;
+
+	return __genpd_dev_pm_attach(dev, dev->of_node, 0);
+}
 EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
 
+/**
+ * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains.
+ * @dev: The device used to lookup the PM domain.
+ * @index: The index of the PM domain.
+ *
+ * Parse device's OF node to find a PM domain specifier at the provided @index.
+ * If such is found, creates a virtual device and attaches it to the retrieved
+ * pm_domain ops. To deal with detaching of the virtual device, the ->detach()
+ * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach().
+ *
+ * Returns the created virtual device if successfully attached PM domain, NULL
+ * when the device don't need a PM domain, else an ERR_PTR() in case of
+ * failures. If a power-domain exists for the device, but cannot be found or
+ * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device
+ * is not probed and to re-try again later.
+ */
+struct device *genpd_dev_pm_attach_by_id(struct device *dev,
+					 unsigned int index)
+{
+	struct device *genpd_dev;
+	int num_domains;
+	int ret;
+
+	if (!dev->of_node)
+		return NULL;
+
+	/* Deal only with devices using multiple PM domains. */
+	num_domains = of_count_phandle_with_args(dev->of_node, "power-domains",
+						 "#power-domain-cells");
+	if (num_domains < 2 || index >= num_domains)
+		return NULL;
+
+	/* Allocate and register device on the genpd bus. */
+	genpd_dev = kzalloc(sizeof(*genpd_dev), GFP_KERNEL);
+	if (!genpd_dev)
+		return ERR_PTR(-ENOMEM);
+
+	dev_set_name(genpd_dev, "genpd:%u:%s", index, dev_name(dev));
+	genpd_dev->bus = &genpd_bus_type;
+	genpd_dev->release = genpd_release_dev;
+
+	ret = device_register(genpd_dev);
+	if (ret) {
+		kfree(genpd_dev);
+		return ERR_PTR(ret);
+	}
+
+	/* Try to attach the device to the PM domain at the specified index. */
+	ret = __genpd_dev_pm_attach(genpd_dev, dev->of_node, index);
+	if (ret < 1) {
+		device_unregister(genpd_dev);
+		return ret ? ERR_PTR(ret) : NULL;
+	}
+
+	pm_runtime_set_active(genpd_dev);
+	pm_runtime_enable(genpd_dev);
+
+	return genpd_dev;
+}
+EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id);
+
 static const struct of_device_id idle_state_match[] = {
 	{ .compatible = "domain-idle-state", },
 	{ }
@@ -2443,6 +2531,12 @@ unsigned int of_genpd_opp_to_performance_state(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(of_genpd_opp_to_performance_state);
 
+static int __init genpd_bus_init(void)
+{
+	return bus_register(&genpd_bus_type);
+}
+core_initcall(genpd_bus_init);
+
 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
 
 

include/linux/pm_domain.h

@@ -237,6 +237,8 @@ unsigned int of_genpd_opp_to_performance_state(struct device *dev,
 				struct device_node *opp_node);
 
 int genpd_dev_pm_attach(struct device *dev);
+struct device *genpd_dev_pm_attach_by_id(struct device *dev,
+					 unsigned int index);
 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
 static inline int of_genpd_add_provider_simple(struct device_node *np,
 					struct generic_pm_domain *genpd)
@@ -282,6 +284,12 @@ static inline int genpd_dev_pm_attach(struct device *dev)
 	return 0;
 }
 
+static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev,
+						       unsigned int index)
+{
+	return NULL;
+}
+
 static inline
 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
 {
@@ -291,13 +299,20 @@ struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
 
 #ifdef CONFIG_PM
 int dev_pm_domain_attach(struct device *dev, bool power_on);
+struct device *dev_pm_domain_attach_by_id(struct device *dev,
+					  unsigned int index);
 void dev_pm_domain_detach(struct device *dev, bool power_off);
 void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
 #else
 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
 {
 	return 0;
 }
+static inline struct device *dev_pm_domain_attach_by_id(struct device *dev,
+							unsigned int index)
+{
+	return NULL;
+}
 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
 static inline void dev_pm_domain_set(struct device *dev,
 				     struct dev_pm_domain *pd) {}

tools/power/cpupower/bench/parse.c

@@ -104,7 +104,7 @@ FILE *prepare_output(const char *dirname)
 			dirname, time(NULL));
 	}
 
-	dprintf("logilename: %s\n", filename);
+	dprintf("logfilename: %s\n", filename);
 
 	output = fopen(filename, "w+");
 	if (output == NULL) {

tools/power/cpupower/utils/idle_monitor/cpuidle_sysfs.c

@@ -126,6 +126,20 @@ void fix_up_intel_idle_driver_name(char *tmp, int num)
 	}
 }
 
+#ifdef __powerpc__
+void map_power_idle_state_name(char *tmp)
+{
+	if (!strncmp(tmp, "stop0_lite", CSTATE_NAME_LEN))
+		strcpy(tmp, "stop0L");
+	else if (!strncmp(tmp, "stop1_lite", CSTATE_NAME_LEN))
+		strcpy(tmp, "stop1L");
+	else if (!strncmp(tmp, "stop2_lite", CSTATE_NAME_LEN))
+		strcpy(tmp, "stop2L");
+}
+#else
+void map_power_idle_state_name(char *tmp) { }
+#endif
+
 static struct cpuidle_monitor *cpuidle_register(void)
 {
 	int num;
@@ -145,6 +159,7 @@ static struct cpuidle_monitor *cpuidle_register(void)
 		if (tmp == NULL)
 			continue;
 
+		map_power_idle_state_name(tmp);
 		fix_up_intel_idle_driver_name(tmp, num);
 		strncpy(cpuidle_cstates[num].name, tmp, CSTATE_NAME_LEN - 1);
 		free(tmp);