diff options
Diffstat (limited to 'include/linux/pm_qos.h')
| -rw-r--r-- | include/linux/pm_qos.h | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h new file mode 100644 index 000000000..7b3ae0cff --- /dev/null +++ b/include/linux/pm_qos.h @@ -0,0 +1,237 @@ +#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> +#include <linux/workqueue.h> + +enum { + PM_QOS_RESERVED = 0, + PM_QOS_CPU_DMA_LATENCY, + PM_QOS_NETWORK_LATENCY, + PM_QOS_NETWORK_THROUGHPUT, + PM_QOS_MEMORY_BANDWIDTH, + + /* insert new class ID */ + PM_QOS_NUM_CLASSES, +}; + +enum pm_qos_flags_status { + PM_QOS_FLAGS_UNDEFINED = -1, + PM_QOS_FLAGS_NONE, + PM_QOS_FLAGS_SOME, + PM_QOS_FLAGS_ALL, +}; + +#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_MEMORY_BANDWIDTH_DEFAULT_VALUE 0 +#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE 0 +#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0 +#define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1) +#define PM_QOS_LATENCY_ANY ((s32)(~(__u32)0 >> 1)) + +#define PM_QOS_FLAG_NO_POWER_OFF (1 << 0) +#define PM_QOS_FLAG_REMOTE_WAKEUP (1 << 1) + +struct pm_qos_request { + struct plist_node node; + int pm_qos_class; + struct delayed_work work; /* for pm_qos_update_request_timeout */ +}; + +struct pm_qos_flags_request { + struct list_head node; + s32 flags; /* Do not change to 64 bit */ +}; + +enum dev_pm_qos_req_type { + DEV_PM_QOS_RESUME_LATENCY = 1, + DEV_PM_QOS_LATENCY_TOLERANCE, + DEV_PM_QOS_FLAGS, +}; + +struct dev_pm_qos_request { + enum dev_pm_qos_req_type type; + union { + struct plist_node pnode; + struct pm_qos_flags_request flr; + } data; + struct device *dev; +}; + +enum pm_qos_type { + PM_QOS_UNITIALIZED, + PM_QOS_MAX, /* return the largest value */ + PM_QOS_MIN, /* return the smallest value */ + PM_QOS_SUM /* return the sum */ +}; + +/* + * Note: The lockless read path depends on the CPU accessing target_value + * or effective_flags 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; + s32 no_constraint_value; + enum pm_qos_type type; + struct blocking_notifier_head *notifiers; +}; + +struct pm_qos_flags { + struct list_head list; + s32 effective_flags; /* Do not change to 64 bit */ +}; + +struct dev_pm_qos { + struct pm_qos_constraints resume_latency; + struct pm_qos_constraints latency_tolerance; + struct pm_qos_flags flags; + struct dev_pm_qos_request *resume_latency_req; + struct dev_pm_qos_request *latency_tolerance_req; + struct dev_pm_qos_request *flags_req; +}; + +/* 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 != NULL; +} + +int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node, + enum pm_qos_req_action action, int value); +bool pm_qos_update_flags(struct pm_qos_flags *pqf, + struct pm_qos_flags_request *req, + enum pm_qos_req_action action, s32 val); +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_update_request_timeout(struct pm_qos_request *req, + s32 new_value, unsigned long timeout_us); +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); + +#ifdef CONFIG_PM +enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask); +enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask); +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, + enum dev_pm_qos_req_type type, 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, + enum dev_pm_qos_req_type type, s32 value); +int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value); +void dev_pm_qos_hide_latency_limit(struct device *dev); +int dev_pm_qos_expose_flags(struct device *dev, s32 value); +void dev_pm_qos_hide_flags(struct device *dev); +int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set); +s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev); +int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val); + +static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev) +{ + return dev->power.qos->resume_latency_req->data.pnode.prio; +} + +static inline s32 dev_pm_qos_requested_flags(struct device *dev) +{ + return dev->power.qos->flags_req->data.flr.flags; +} +#else +static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, + s32 mask) + { return PM_QOS_FLAGS_UNDEFINED; } +static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, + s32 mask) + { return PM_QOS_FLAGS_UNDEFINED; } +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, + enum dev_pm_qos_req_type type, + 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, + enum dev_pm_qos_req_type type, + s32 value) + { return 0; } +static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) + { return 0; } +static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {} +static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value) + { return 0; } +static inline void dev_pm_qos_hide_flags(struct device *dev) {} +static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set) + { return 0; } +static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev) + { return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; } +static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val) + { return 0; } + +static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev) { return 0; } +static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; } +#endif + +#endif |