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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 <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>
This commit is contained in:
Rafael J. Wysocki 2011-12-01 00:02:05 +01:00
parent d23b9b00cd
commit b02c999ac3
5 changed files with 118 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

63
include/linux/pm_domain.h
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@ -21,6 +21,7 @@ enum gpd_status {
struct dev_power_governor {
bool (*power_down_ok)(struct dev_pm_domain *domain);
bool (*stop_ok)(struct device *dev);
};
struct gpd_dev_ops {
@ -76,9 +77,16 @@ struct gpd_link {
struct list_head slave_node;
};
struct gpd_timing_data {
s64 stop_latency_ns;
s64 start_latency_ns;
s64 break_even_ns;
};
struct generic_pm_domain_data {
struct pm_domain_data base;
struct gpd_dev_ops ops;
struct gpd_timing_data td;
bool need_restore;
};
@ -93,20 +101,48 @@ static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
return to_gpd_data(dev->power.subsys_data->domain_data);
}
extern int pm_genpd_add_device(struct generic_pm_domain *genpd,
struct device *dev);
extern struct dev_power_governor simple_qos_governor;
extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
struct device *dev,
struct gpd_timing_data *td);
static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
struct device *dev)
{
return __pm_genpd_add_device(genpd, dev, NULL);
}
extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
struct device *dev);
extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
struct generic_pm_domain *new_subdomain);
extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
struct generic_pm_domain *target);
extern int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops);
extern int pm_genpd_remove_callbacks(struct device *dev);
extern int pm_genpd_add_callbacks(struct device *dev,
struct gpd_dev_ops *ops,
struct gpd_timing_data *td);
extern int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td);
extern void pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off);
extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
extern bool default_stop_ok(struct device *dev);
#else
static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
{
return ERR_PTR(-ENOSYS);
}
static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
struct device *dev,
struct gpd_timing_data *td)
{
return -ENOSYS;
}
static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
struct device *dev)
{
@ -128,22 +164,33 @@ static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
return -ENOSYS;
}
static inline int pm_genpd_add_callbacks(struct device *dev,
struct gpd_dev_ops *ops)
struct gpd_dev_ops *ops,
struct gpd_timing_data *td)
{
return -ENOSYS;
}
static inline int pm_genpd_remove_callbacks(struct device *dev)
static inline int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
{
return -ENOSYS;
}
static inline void pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off) {}
static inline void pm_genpd_init(struct generic_pm_domain *genpd, bool is_off)
{
}
static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
{
return -ENOSYS;
}
static inline bool default_stop_ok(struct device *dev)
{
return false;
}
#endif
static inline int pm_genpd_remove_callbacks(struct device *dev)
{
return __pm_genpd_remove_callbacks(dev, true);
}
#ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
extern void pm_genpd_poweroff_unused(void);