PM: QoS: Introduce frequency QoS

[linux-2.6-block.git] / include / linux / pm_qos.h

diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index 222c3e01397c17674ea6811aaefc330c3a3077a1..57b93e3d8f294b1696aaf117d81f286fe5789c4c 100644 (file)
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -267,4 +267,48 @@ static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
 }
 #endif
 
+#define FREQ_QOS_MIN_DEFAULT_VALUE     0
+#define FREQ_QOS_MAX_DEFAULT_VALUE     (-1)
+
+enum freq_qos_req_type {
+       FREQ_QOS_MIN = 1,
+       FREQ_QOS_MAX,
+};
+
+struct freq_constraints {
+       struct pm_qos_constraints min_freq;
+       struct blocking_notifier_head min_freq_notifiers;
+       struct pm_qos_constraints max_freq;
+       struct blocking_notifier_head max_freq_notifiers;
+};
+
+struct freq_qos_request {
+       enum freq_qos_req_type type;
+       struct plist_node pnode;
+       struct freq_constraints *qos;
+};
+
+static inline int freq_qos_request_active(struct freq_qos_request *req)
+{
+       return !IS_ERR_OR_NULL(req->qos);
+}
+
+void freq_constraints_init(struct freq_constraints *qos);
+
+s32 freq_qos_read_value(struct freq_constraints *qos,
+                       enum freq_qos_req_type type);
+
+int freq_qos_add_request(struct freq_constraints *qos,
+                        struct freq_qos_request *req,
+                        enum freq_qos_req_type type, s32 value);
+int freq_qos_update_request(struct freq_qos_request *req, s32 new_value);
+int freq_qos_remove_request(struct freq_qos_request *req);
+
+int freq_qos_add_notifier(struct freq_constraints *qos,
+                         enum freq_qos_req_type type,
+                         struct notifier_block *notifier);
+int freq_qos_remove_notifier(struct freq_constraints *qos,
+                            enum freq_qos_req_type type,
+                            struct notifier_block *notifier);
+
 #endif