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authorRafael J. Wysocki <rjw@sisk.pl>2011-12-01 03:02:05 +0400
committerRafael J. Wysocki <rjw@sisk.pl>2011-12-02 00:47:40 +0400
commitb02c999ac325e977585abeb4caf6e0a2ee21e30b (patch)
tree1ddec5f020a80b9df443b03ffb578ef7f882abb6 /include
parentd23b9b00cdde5c93b914a172cecd57d5625fcd04 (diff)
downloadlinux-b02c999ac325e977585abeb4caf6e0a2ee21e30b.tar.xz
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/pm_domain.h63
1 files changed, 55 insertions, 8 deletions
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 10a197dce07e..f6745c213a57 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -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);