PM QoS: Add global notification mechanism for device constraints

Add a global notification chain that gets called upon changes to the
aggregated constraint value for any device.
The notification callbacks are passing the full constraint request data
in order for the callees to have access to it. The current use is for the
platform low-level code to access the target device of the constraint.

Signed-off-by: Jean Pihet <j-pihet@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index f75f74dd9b90..ca7bd3f98cb4 100644
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -75,6 +75,7 @@ int pm_qos_request(int pm_qos_class);
 int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
 int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
 int pm_qos_request_active(struct pm_qos_request *req);
+s32 pm_qos_read_value(struct pm_qos_constraints *c);
 
 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
                            s32 value);
@@ -84,6 +85,8 @@ int dev_pm_qos_add_notifier(struct device *dev,
                             struct notifier_block *notifier);
 int dev_pm_qos_remove_notifier(struct device *dev,
                                struct notifier_block *notifier);
+int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
+int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
 void dev_pm_qos_constraints_init(struct device *dev);
 void dev_pm_qos_constraints_destroy(struct device *dev);
 #else
@@ -111,6 +114,8 @@ static inline int pm_qos_remove_notifier(int pm_qos_class,
                         { return 0; }
 static inline int pm_qos_request_active(struct pm_qos_request *req)
                         { return 0; }
+static inline s32 pm_qos_read_value(struct pm_qos_constraints *c)
+                        { return 0; }
 
 static inline int dev_pm_qos_add_request(struct device *dev,
                                          struct dev_pm_qos_request *req,
@@ -127,6 +132,12 @@ static inline int dev_pm_qos_add_notifier(struct device *dev,
 static inline int dev_pm_qos_remove_notifier(struct device *dev,
                                              struct notifier_block *notifier)
                         { return 0; }
+static inline int dev_pm_qos_add_global_notifier(
+                                        struct notifier_block *notifier)
+                        { return 0; }
+static inline int dev_pm_qos_remove_global_notifier(
+                                        struct notifier_block *notifier)
+                        { return 0; }
 static inline void dev_pm_qos_constraints_init(struct device *dev)
                         { return; }
 static inline void dev_pm_qos_constraints_destroy(struct device *dev)