linux/include/linux/pm_qos.h
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   1#ifndef _LINUX_PM_QOS_H
   2#define _LINUX_PM_QOS_H
   3/* interface for the pm_qos_power infrastructure of the linux kernel.
   4 *
   5 * Mark Gross <mgross@linux.intel.com>
   6 */
   7#include <linux/plist.h>
   8#include <linux/notifier.h>
   9#include <linux/miscdevice.h>
  10#include <linux/device.h>
  11#include <linux/workqueue.h>
  12
  13enum {
  14        PM_QOS_RESERVED = 0,
  15        PM_QOS_CPU_DMA_LATENCY,
  16        PM_QOS_NETWORK_LATENCY,
  17        PM_QOS_NETWORK_THROUGHPUT,
  18
  19        /* insert new class ID */
  20        PM_QOS_NUM_CLASSES,
  21};
  22
  23#define PM_QOS_DEFAULT_VALUE -1
  24
  25#define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE        (2000 * USEC_PER_SEC)
  26#define PM_QOS_NETWORK_LAT_DEFAULT_VALUE        (2000 * USEC_PER_SEC)
  27#define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
  28#define PM_QOS_DEV_LAT_DEFAULT_VALUE            0
  29
  30struct pm_qos_request {
  31        struct plist_node node;
  32        int pm_qos_class;
  33        struct delayed_work work; /* for pm_qos_update_request_timeout */
  34};
  35
  36struct dev_pm_qos_request {
  37        struct plist_node node;
  38        struct device *dev;
  39};
  40
  41enum pm_qos_type {
  42        PM_QOS_UNITIALIZED,
  43        PM_QOS_MAX,             /* return the largest value */
  44        PM_QOS_MIN              /* return the smallest value */
  45};
  46
  47/*
  48 * Note: The lockless read path depends on the CPU accessing
  49 * target_value atomically.  Atomic access is only guaranteed on all CPU
  50 * types linux supports for 32 bit quantites
  51 */
  52struct pm_qos_constraints {
  53        struct plist_head list;
  54        s32 target_value;       /* Do not change to 64 bit */
  55        s32 default_value;
  56        enum pm_qos_type type;
  57        struct blocking_notifier_head *notifiers;
  58};
  59
  60/* Action requested to pm_qos_update_target */
  61enum pm_qos_req_action {
  62        PM_QOS_ADD_REQ,         /* Add a new request */
  63        PM_QOS_UPDATE_REQ,      /* Update an existing request */
  64        PM_QOS_REMOVE_REQ       /* Remove an existing request */
  65};
  66
  67static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
  68{
  69        return req->dev != NULL;
  70}
  71
  72int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
  73                         enum pm_qos_req_action action, int value);
  74void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
  75                        s32 value);
  76void pm_qos_update_request(struct pm_qos_request *req,
  77                           s32 new_value);
  78void pm_qos_update_request_timeout(struct pm_qos_request *req,
  79                                   s32 new_value, unsigned long timeout_us);
  80void pm_qos_remove_request(struct pm_qos_request *req);
  81
  82int pm_qos_request(int pm_qos_class);
  83int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
  84int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
  85int pm_qos_request_active(struct pm_qos_request *req);
  86s32 pm_qos_read_value(struct pm_qos_constraints *c);
  87
  88#ifdef CONFIG_PM
  89s32 __dev_pm_qos_read_value(struct device *dev);
  90s32 dev_pm_qos_read_value(struct device *dev);
  91int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
  92                           s32 value);
  93int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
  94int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
  95int dev_pm_qos_add_notifier(struct device *dev,
  96                            struct notifier_block *notifier);
  97int dev_pm_qos_remove_notifier(struct device *dev,
  98                               struct notifier_block *notifier);
  99int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
 100int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
 101void dev_pm_qos_constraints_init(struct device *dev);
 102void dev_pm_qos_constraints_destroy(struct device *dev);
 103int dev_pm_qos_add_ancestor_request(struct device *dev,
 104                                    struct dev_pm_qos_request *req, s32 value);
 105#else
 106static inline s32 __dev_pm_qos_read_value(struct device *dev)
 107                        { return 0; }
 108static inline s32 dev_pm_qos_read_value(struct device *dev)
 109                        { return 0; }
 110static inline int dev_pm_qos_add_request(struct device *dev,
 111                                         struct dev_pm_qos_request *req,
 112                                         s32 value)
 113                        { return 0; }
 114static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
 115                                            s32 new_value)
 116                        { return 0; }
 117static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
 118                        { return 0; }
 119static inline int dev_pm_qos_add_notifier(struct device *dev,
 120                                          struct notifier_block *notifier)
 121                        { return 0; }
 122static inline int dev_pm_qos_remove_notifier(struct device *dev,
 123                                             struct notifier_block *notifier)
 124                        { return 0; }
 125static inline int dev_pm_qos_add_global_notifier(
 126                                        struct notifier_block *notifier)
 127                        { return 0; }
 128static inline int dev_pm_qos_remove_global_notifier(
 129                                        struct notifier_block *notifier)
 130                        { return 0; }
 131static inline void dev_pm_qos_constraints_init(struct device *dev)
 132{
 133        dev->power.power_state = PMSG_ON;
 134}
 135static inline void dev_pm_qos_constraints_destroy(struct device *dev)
 136{
 137        dev->power.power_state = PMSG_INVALID;
 138}
 139static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
 140                                    struct dev_pm_qos_request *req, s32 value)
 141                        { return 0; }
 142#endif
 143
 144#ifdef CONFIG_PM_RUNTIME
 145int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
 146void dev_pm_qos_hide_latency_limit(struct device *dev);
 147#else
 148static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
 149                        { return 0; }
 150static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
 151#endif
 152
 153#endif
 154
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