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PM / Domains: Add device stop governor function (v4)

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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 <[email protected]>
Acked-by: Magnus Damm <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2011-12-01 00:02:05 +01:00
commit b02c999ac3
5 changed files with 118 additions and 17 deletions
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2
drivers/base/power/Makefile
View file

@ -3,7 +3,7 @@ obj-$(CONFIG_PM_SLEEP) += main.o wakeup.o
obj-$(CONFIG_PM_RUNTIME) += runtime.o
obj-$(CONFIG_PM_TRACE_RTC) += trace.o
obj-$(CONFIG_PM_OPP) += opp.o
obj-$(CONFIG_PM_GENERIC_DOMAINS) += domain.o
obj-$(CONFIG_PM_GENERIC_DOMAINS) += domain.o domain_governor.o
obj-$(CONFIG_HAVE_CLK) += clock_ops.o
ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG

33
drivers/base/power/domain.c
View file

@ -38,7 +38,7 @@ static DEFINE_MUTEX(gpd_list_lock);
#ifdef CONFIG_PM
static struct generic_pm_domain *dev_to_genpd(struct device *dev)
struct generic_pm_domain *dev_to_genpd(struct device *dev)
{
if (IS_ERR_OR_NULL(dev->pm_domain))
return ERR_PTR(-EINVAL);
@ -436,6 +436,7 @@ static void genpd_power_off_work_fn(struct work_struct *work)
static int pm_genpd_runtime_suspend(struct device *dev)
{
struct generic_pm_domain *genpd;
bool (*stop_ok)(struct device *__dev);
int ret;
dev_dbg(dev, "%s()\n", __func__);
@ -446,10 +447,17 @@ static int pm_genpd_runtime_suspend(struct device *dev)
might_sleep_if(!genpd->dev_irq_safe);
stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL;
if (stop_ok && !stop_ok(dev))
return -EBUSY;
ret = genpd_stop_dev(genpd, dev);
if (ret)
return ret;
pm_runtime_update_max_time_suspended(dev,
dev_gpd_data(dev)->td.start_latency_ns);
/*
* If power.irq_safe is set, this routine will be run with interrupts
* off, so it can't use mutexes.
@ -1048,11 +1056,13 @@ static void pm_genpd_complete(struct device *dev)
#endif /* CONFIG_PM_SLEEP */
/**
* pm_genpd_add_device - Add a device to an I/O PM domain.
* __pm_genpd_add_device - Add a device to an I/O PM domain.
* @genpd: PM domain to add the device to.
* @dev: Device to be added.
* @td: Set of PM QoS timing parameters to attach to the device.
*/
int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
struct gpd_timing_data *td)
{
struct generic_pm_domain_data *gpd_data;
struct pm_domain_data *pdd;
@ -1095,6 +1105,8 @@ int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
gpd_data->base.dev = dev;
gpd_data->need_restore = false;
list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
if (td)
gpd_data->td = *td;
out:
genpd_release_lock(genpd);
@ -1255,8 +1267,10 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
* pm_genpd_add_callbacks - Add PM domain callbacks to a given device.
* @dev: Device to add the callbacks to.
* @ops: Set of callbacks to add.
* @td: Timing data to add to the device along with the callbacks (optional).
*/
int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops)
int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops,
struct gpd_timing_data *td)
{
struct pm_domain_data *pdd;
int ret = 0;
@ -1272,6 +1286,8 @@ int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops)
struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
gpd_data->ops = *ops;
if (td)
gpd_data->td = *td;
} else {
ret = -EINVAL;
}
@ -1284,10 +1300,11 @@ int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops)
EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks);
/**
* pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device.
* __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device.
* @dev: Device to remove the callbacks from.
* @clear_td: If set, clear the device's timing data too.
*/
int pm_genpd_remove_callbacks(struct device *dev)
int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
{
struct pm_domain_data *pdd;
int ret = 0;
@ -1303,6 +1320,8 @@ int pm_genpd_remove_callbacks(struct device *dev)
struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
gpd_data->ops = (struct gpd_dev_ops){ 0 };
if (clear_td)
gpd_data->td = (struct gpd_timing_data){ 0 };
} else {
ret = -EINVAL;
}
@ -1312,7 +1331,7 @@ int pm_genpd_remove_callbacks(struct device *dev)
return ret;
}
EXPORT_SYMBOL_GPL(pm_genpd_remove_callbacks);
EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks);
/* Default device callbacks for generic PM domains. */

33
drivers/base/power/domain_governor.c Normal file
View file

@ -0,0 +1,33 @@
/*
* drivers/base/power/domain_governor.c - Governors for device PM domains.
*
* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
*
* This file is released under the GPLv2.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/pm_domain.h>
#include <linux/pm_qos.h>
/**
* default_stop_ok - Default PM domain governor routine for stopping devices.
* @dev: Device to check.
*/
bool default_stop_ok(struct device *dev)
{
struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
dev_dbg(dev, "%s()\n", __func__);
if (dev->power.max_time_suspended_ns < 0 || td->break_even_ns == 0)
return true;
return td->stop_latency_ns + td->start_latency_ns < td->break_even_ns
&& td->break_even_ns < dev->power.max_time_suspended_ns;
}
struct dev_power_governor simple_qos_governor = {
.stop_ok = default_stop_ok,
};