154 lines
5.0 KiB
C
154 lines
5.0 KiB
C
#ifndef _LINUX_PM_QOS_H
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#define _LINUX_PM_QOS_H
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/* interface for the pm_qos_power infrastructure of the linux kernel.
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*
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* Mark Gross <mgross@linux.intel.com>
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*/
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#include <linux/plist.h>
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#include <linux/notifier.h>
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#include <linux/miscdevice.h>
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#include <linux/device.h>
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#include <linux/workqueue.h>
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enum {
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PM_QOS_RESERVED = 0,
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PM_QOS_CPU_DMA_LATENCY,
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PM_QOS_NETWORK_LATENCY,
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PM_QOS_NETWORK_THROUGHPUT,
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/* insert new class ID */
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PM_QOS_NUM_CLASSES,
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};
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#define PM_QOS_DEFAULT_VALUE -1
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#define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
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#define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
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#define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
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#define PM_QOS_DEV_LAT_DEFAULT_VALUE 0
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struct pm_qos_request {
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struct plist_node node;
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int pm_qos_class;
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struct delayed_work work; /* for pm_qos_update_request_timeout */
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};
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struct dev_pm_qos_request {
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struct plist_node node;
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struct device *dev;
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};
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enum pm_qos_type {
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PM_QOS_UNITIALIZED,
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PM_QOS_MAX, /* return the largest value */
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PM_QOS_MIN /* return the smallest value */
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};
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/*
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* Note: The lockless read path depends on the CPU accessing
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* target_value atomically. Atomic access is only guaranteed on all CPU
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* types linux supports for 32 bit quantites
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*/
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struct pm_qos_constraints {
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struct plist_head list;
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s32 target_value; /* Do not change to 64 bit */
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s32 default_value;
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enum pm_qos_type type;
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struct blocking_notifier_head *notifiers;
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};
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/* Action requested to pm_qos_update_target */
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enum pm_qos_req_action {
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PM_QOS_ADD_REQ, /* Add a new request */
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PM_QOS_UPDATE_REQ, /* Update an existing request */
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PM_QOS_REMOVE_REQ /* Remove an existing request */
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};
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static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
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{
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return req->dev != NULL;
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}
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int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
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enum pm_qos_req_action action, int value);
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void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
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s32 value);
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void pm_qos_update_request(struct pm_qos_request *req,
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s32 new_value);
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void pm_qos_update_request_timeout(struct pm_qos_request *req,
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s32 new_value, unsigned long timeout_us);
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void pm_qos_remove_request(struct pm_qos_request *req);
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int pm_qos_request(int pm_qos_class);
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int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
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int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
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int pm_qos_request_active(struct pm_qos_request *req);
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s32 pm_qos_read_value(struct pm_qos_constraints *c);
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#ifdef CONFIG_PM
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s32 __dev_pm_qos_read_value(struct device *dev);
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s32 dev_pm_qos_read_value(struct device *dev);
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int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
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s32 value);
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int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
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int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
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int dev_pm_qos_add_notifier(struct device *dev,
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struct notifier_block *notifier);
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int dev_pm_qos_remove_notifier(struct device *dev,
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struct notifier_block *notifier);
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int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
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int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
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void dev_pm_qos_constraints_init(struct device *dev);
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void dev_pm_qos_constraints_destroy(struct device *dev);
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int dev_pm_qos_add_ancestor_request(struct device *dev,
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struct dev_pm_qos_request *req, s32 value);
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#else
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static inline s32 __dev_pm_qos_read_value(struct device *dev)
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{ return 0; }
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static inline s32 dev_pm_qos_read_value(struct device *dev)
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{ return 0; }
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static inline int dev_pm_qos_add_request(struct device *dev,
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struct dev_pm_qos_request *req,
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s32 value)
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{ return 0; }
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static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
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s32 new_value)
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{ return 0; }
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static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
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{ return 0; }
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static inline int dev_pm_qos_add_notifier(struct device *dev,
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struct notifier_block *notifier)
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{ return 0; }
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static inline int dev_pm_qos_remove_notifier(struct device *dev,
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struct notifier_block *notifier)
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{ return 0; }
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static inline int dev_pm_qos_add_global_notifier(
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struct notifier_block *notifier)
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{ return 0; }
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static inline int dev_pm_qos_remove_global_notifier(
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struct notifier_block *notifier)
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{ return 0; }
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static inline void dev_pm_qos_constraints_init(struct device *dev)
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{
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dev->power.power_state = PMSG_ON;
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}
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static inline void dev_pm_qos_constraints_destroy(struct device *dev)
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{
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dev->power.power_state = PMSG_INVALID;
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}
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static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
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struct dev_pm_qos_request *req, s32 value)
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{ return 0; }
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#endif
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#ifdef CONFIG_PM_RUNTIME
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int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
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void dev_pm_qos_hide_latency_limit(struct device *dev);
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#else
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static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
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{ return 0; }
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static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
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#endif
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#endif
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