PM / Domains: Add device stop governor function (v4)
Add a function deciding whether or not devices should be stopped in pm_genpd_runtime_suspend() depending on their PM QoS constraints and stop/start timing values. Make it possible to add information used by this function to device objects. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Magnus Damm <damm@opensource.se>
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d23b9b00cd
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b02c999ac3
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@ -169,6 +169,7 @@ static bool sh7372_power_down_forbidden(struct dev_pm_domain *domain)
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struct dev_power_governor sh7372_always_on_gov = {
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.power_down_ok = sh7372_power_down_forbidden,
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.stop_ok = default_stop_ok,
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};
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static int sh7372_stop_dev(struct device *dev)
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@ -203,8 +204,9 @@ static int sh7372_start_dev(struct device *dev)
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void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd)
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{
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struct generic_pm_domain *genpd = &sh7372_pd->genpd;
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struct dev_power_governor *gov = sh7372_pd->gov;
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pm_genpd_init(genpd, sh7372_pd->gov, false);
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pm_genpd_init(genpd, gov ? : &simple_qos_governor, false);
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genpd->dev_ops.stop = sh7372_stop_dev;
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genpd->dev_ops.start = sh7372_start_dev;
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genpd->dev_ops.active_wakeup = pd_active_wakeup;
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@ -3,7 +3,7 @@ obj-$(CONFIG_PM_SLEEP) += main.o wakeup.o
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obj-$(CONFIG_PM_RUNTIME) += runtime.o
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obj-$(CONFIG_PM_TRACE_RTC) += trace.o
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obj-$(CONFIG_PM_OPP) += opp.o
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obj-$(CONFIG_PM_GENERIC_DOMAINS) += domain.o
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obj-$(CONFIG_PM_GENERIC_DOMAINS) += domain.o domain_governor.o
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obj-$(CONFIG_HAVE_CLK) += clock_ops.o
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ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
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@ -38,7 +38,7 @@ static DEFINE_MUTEX(gpd_list_lock);
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#ifdef CONFIG_PM
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static struct generic_pm_domain *dev_to_genpd(struct device *dev)
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struct generic_pm_domain *dev_to_genpd(struct device *dev)
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{
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if (IS_ERR_OR_NULL(dev->pm_domain))
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return ERR_PTR(-EINVAL);
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@ -436,6 +436,7 @@ static void genpd_power_off_work_fn(struct work_struct *work)
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static int pm_genpd_runtime_suspend(struct device *dev)
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{
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struct generic_pm_domain *genpd;
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bool (*stop_ok)(struct device *__dev);
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int ret;
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dev_dbg(dev, "%s()\n", __func__);
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@ -446,10 +447,17 @@ static int pm_genpd_runtime_suspend(struct device *dev)
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might_sleep_if(!genpd->dev_irq_safe);
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stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL;
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if (stop_ok && !stop_ok(dev))
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return -EBUSY;
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ret = genpd_stop_dev(genpd, dev);
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if (ret)
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return ret;
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pm_runtime_update_max_time_suspended(dev,
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dev_gpd_data(dev)->td.start_latency_ns);
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/*
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* If power.irq_safe is set, this routine will be run with interrupts
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* off, so it can't use mutexes.
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@ -1048,11 +1056,13 @@ static void pm_genpd_complete(struct device *dev)
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#endif /* CONFIG_PM_SLEEP */
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/**
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* pm_genpd_add_device - Add a device to an I/O PM domain.
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* __pm_genpd_add_device - Add a device to an I/O PM domain.
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* @genpd: PM domain to add the device to.
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* @dev: Device to be added.
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* @td: Set of PM QoS timing parameters to attach to the device.
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*/
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int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
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int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
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struct gpd_timing_data *td)
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{
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struct generic_pm_domain_data *gpd_data;
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struct pm_domain_data *pdd;
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@ -1095,6 +1105,8 @@ int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
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gpd_data->base.dev = dev;
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gpd_data->need_restore = false;
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list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
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if (td)
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gpd_data->td = *td;
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out:
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genpd_release_lock(genpd);
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@ -1255,8 +1267,10 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
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* pm_genpd_add_callbacks - Add PM domain callbacks to a given device.
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* @dev: Device to add the callbacks to.
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* @ops: Set of callbacks to add.
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* @td: Timing data to add to the device along with the callbacks (optional).
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*/
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int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops)
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int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops,
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struct gpd_timing_data *td)
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{
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struct pm_domain_data *pdd;
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int ret = 0;
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@ -1272,6 +1286,8 @@ int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops)
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struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
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gpd_data->ops = *ops;
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if (td)
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gpd_data->td = *td;
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} else {
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ret = -EINVAL;
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}
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@ -1284,10 +1300,11 @@ int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops)
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EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks);
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/**
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* pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device.
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* __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device.
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* @dev: Device to remove the callbacks from.
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* @clear_td: If set, clear the device's timing data too.
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*/
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int pm_genpd_remove_callbacks(struct device *dev)
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int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
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{
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struct pm_domain_data *pdd;
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int ret = 0;
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@ -1303,6 +1320,8 @@ int pm_genpd_remove_callbacks(struct device *dev)
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struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
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gpd_data->ops = (struct gpd_dev_ops){ 0 };
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if (clear_td)
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gpd_data->td = (struct gpd_timing_data){ 0 };
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} else {
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ret = -EINVAL;
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}
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@ -1312,7 +1331,7 @@ int pm_genpd_remove_callbacks(struct device *dev)
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return ret;
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}
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EXPORT_SYMBOL_GPL(pm_genpd_remove_callbacks);
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EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks);
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/* Default device callbacks for generic PM domains. */
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33
drivers/base/power/domain_governor.c
Normal file
33
drivers/base/power/domain_governor.c
Normal file
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@ -0,0 +1,33 @@
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/*
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* drivers/base/power/domain_governor.c - Governors for device PM domains.
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*
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* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/pm_domain.h>
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#include <linux/pm_qos.h>
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/**
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* default_stop_ok - Default PM domain governor routine for stopping devices.
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* @dev: Device to check.
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*/
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bool default_stop_ok(struct device *dev)
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{
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struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
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dev_dbg(dev, "%s()\n", __func__);
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if (dev->power.max_time_suspended_ns < 0 || td->break_even_ns == 0)
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return true;
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return td->stop_latency_ns + td->start_latency_ns < td->break_even_ns
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&& td->break_even_ns < dev->power.max_time_suspended_ns;
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}
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struct dev_power_governor simple_qos_governor = {
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.stop_ok = default_stop_ok,
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};
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@ -21,6 +21,7 @@ enum gpd_status {
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struct dev_power_governor {
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bool (*power_down_ok)(struct dev_pm_domain *domain);
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bool (*stop_ok)(struct device *dev);
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};
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struct gpd_dev_ops {
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@ -76,9 +77,16 @@ struct gpd_link {
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struct list_head slave_node;
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};
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struct gpd_timing_data {
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s64 stop_latency_ns;
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s64 start_latency_ns;
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s64 break_even_ns;
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};
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struct generic_pm_domain_data {
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struct pm_domain_data base;
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struct gpd_dev_ops ops;
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struct gpd_timing_data td;
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bool need_restore;
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};
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@ -93,20 +101,48 @@ static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
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return to_gpd_data(dev->power.subsys_data->domain_data);
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}
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extern int pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev);
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extern struct dev_power_governor simple_qos_governor;
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extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
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extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev,
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struct gpd_timing_data *td);
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static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev)
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{
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return __pm_genpd_add_device(genpd, dev, NULL);
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}
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extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
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struct device *dev);
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extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *new_subdomain);
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extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *target);
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extern int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops);
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extern int pm_genpd_remove_callbacks(struct device *dev);
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extern int pm_genpd_add_callbacks(struct device *dev,
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struct gpd_dev_ops *ops,
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struct gpd_timing_data *td);
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extern int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td);
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extern void pm_genpd_init(struct generic_pm_domain *genpd,
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struct dev_power_governor *gov, bool is_off);
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extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
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extern bool default_stop_ok(struct device *dev);
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#else
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static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev,
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struct gpd_timing_data *td)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev)
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{
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@ -128,22 +164,33 @@ static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
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return -ENOSYS;
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}
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static inline int pm_genpd_add_callbacks(struct device *dev,
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struct gpd_dev_ops *ops)
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struct gpd_dev_ops *ops,
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struct gpd_timing_data *td)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_remove_callbacks(struct device *dev)
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static inline int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
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{
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return -ENOSYS;
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}
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static inline void pm_genpd_init(struct generic_pm_domain *genpd,
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struct dev_power_governor *gov, bool is_off) {}
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static inline void pm_genpd_init(struct generic_pm_domain *genpd, bool is_off)
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{
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}
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static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
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{
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return -ENOSYS;
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}
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static inline bool default_stop_ok(struct device *dev)
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{
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return false;
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}
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#endif
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static inline int pm_genpd_remove_callbacks(struct device *dev)
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{
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return __pm_genpd_remove_callbacks(dev, true);
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}
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#ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
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extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
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extern void pm_genpd_poweroff_unused(void);
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