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-rw-r--r--include/linux/pm_qos.h163
1 files changed, 163 insertions, 0 deletions
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
new file mode 100644
index 00000000000..e5bbcbaa6f5
--- /dev/null
+++ b/include/linux/pm_qos.h
@@ -0,0 +1,163 @@
+#ifndef _LINUX_PM_QOS_H
+#define _LINUX_PM_QOS_H
+/* interface for the pm_qos_power infrastructure of the linux kernel.
+ *
+ * Mark Gross <mgross@linux.intel.com>
+ */
+#include <linux/plist.h>
+#include <linux/notifier.h>
+#include <linux/miscdevice.h>
+#include <linux/device.h>
+
+#define PM_QOS_RESERVED 0
+#define PM_QOS_CPU_DMA_LATENCY 1
+#define PM_QOS_NETWORK_LATENCY 2
+#define PM_QOS_NETWORK_THROUGHPUT 3
+
+#define PM_QOS_NUM_CLASSES 4
+#define PM_QOS_DEFAULT_VALUE -1
+
+#define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
+#define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
+#define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
+#define PM_QOS_DEV_LAT_DEFAULT_VALUE 0
+
+struct pm_qos_request {
+ struct plist_node node;
+ int pm_qos_class;
+};
+
+struct dev_pm_qos_request {
+ struct plist_node node;
+ struct device *dev;
+};
+
+enum pm_qos_type {
+ PM_QOS_UNITIALIZED,
+ PM_QOS_MAX, /* return the largest value */
+ PM_QOS_MIN /* return the smallest value */
+};
+
+/*
+ * Note: The lockless read path depends on the CPU accessing
+ * target_value atomically. Atomic access is only guaranteed on all CPU
+ * types linux supports for 32 bit quantites
+ */
+struct pm_qos_constraints {
+ struct plist_head list;
+ s32 target_value; /* Do not change to 64 bit */
+ s32 default_value;
+ enum pm_qos_type type;
+ struct blocking_notifier_head *notifiers;
+};
+
+/* Action requested to pm_qos_update_target */
+enum pm_qos_req_action {
+ PM_QOS_ADD_REQ, /* Add a new request */
+ PM_QOS_UPDATE_REQ, /* Update an existing request */
+ PM_QOS_REMOVE_REQ /* Remove an existing request */
+};
+
+static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
+{
+ return req->dev != 0;
+}
+
+#ifdef CONFIG_PM
+int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
+ enum pm_qos_req_action action, int value);
+void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
+ s32 value);
+void pm_qos_update_request(struct pm_qos_request *req,
+ s32 new_value);
+void pm_qos_remove_request(struct pm_qos_request *req);
+
+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);
+
+s32 __dev_pm_qos_read_value(struct device *dev);
+s32 dev_pm_qos_read_value(struct device *dev);
+int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
+ s32 value);
+int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
+int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
+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);
+int dev_pm_qos_add_ancestor_request(struct device *dev,
+ struct dev_pm_qos_request *req, s32 value);
+#else
+static inline int pm_qos_update_target(struct pm_qos_constraints *c,
+ struct plist_node *node,
+ enum pm_qos_req_action action,
+ int value)
+ { return 0; }
+static inline void pm_qos_add_request(struct pm_qos_request *req,
+ int pm_qos_class, s32 value)
+ { return; }
+static inline void pm_qos_update_request(struct pm_qos_request *req,
+ s32 new_value)
+ { return; }
+static inline void pm_qos_remove_request(struct pm_qos_request *req)
+ { return; }
+
+static inline int pm_qos_request(int pm_qos_class)
+ { return 0; }
+static inline int pm_qos_add_notifier(int pm_qos_class,
+ struct notifier_block *notifier)
+ { return 0; }
+static inline int pm_qos_remove_notifier(int pm_qos_class,
+ struct notifier_block *notifier)
+ { 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 s32 __dev_pm_qos_read_value(struct device *dev)
+ { return 0; }
+static inline s32 dev_pm_qos_read_value(struct device *dev)
+ { return 0; }
+static inline int dev_pm_qos_add_request(struct device *dev,
+ struct dev_pm_qos_request *req,
+ s32 value)
+ { return 0; }
+static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
+ s32 new_value)
+ { return 0; }
+static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
+ { return 0; }
+static inline int dev_pm_qos_add_notifier(struct device *dev,
+ struct notifier_block *notifier)
+ { return 0; }
+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)
+{
+ dev->power.power_state = PMSG_ON;
+}
+static inline void dev_pm_qos_constraints_destroy(struct device *dev)
+{
+ dev->power.power_state = PMSG_INVALID;
+}
+static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
+ struct dev_pm_qos_request *req, s32 value)
+ { return 0; }
+#endif
+
+#endif