include/linux/pm_qos.h

Source file repositories/reference/linux-study-clean/include/linux/pm_qos.h

File Facts

System
Linux kernel
Corpus path
include/linux/pm_qos.h
Extension
.h
Size
10858 bytes
Lines
329
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

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_request {
	struct plist_node node;
	struct pm_qos_constraints *qos;
};

struct pm_qos_flags_request {
	struct list_head node;
	s32 flags;	/* Do not change to 64 bit */
};

struct pm_qos_flags {
	struct list_head list;
	s32 effective_flags;	/* Do not change to 64 bit */
};


#define FREQ_QOS_MIN_DEFAULT_VALUE	0
#define FREQ_QOS_MAX_DEFAULT_VALUE	S32_MAX

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;
};


enum dev_pm_qos_req_type {
	DEV_PM_QOS_RESUME_LATENCY = 1,
	DEV_PM_QOS_LATENCY_TOLERANCE,
	DEV_PM_QOS_MIN_FREQUENCY,
	DEV_PM_QOS_MAX_FREQUENCY,
	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;
		struct freq_qos_request freq;
	} data;
	struct device *dev;
};

struct dev_pm_qos {
	struct pm_qos_constraints resume_latency;
	struct pm_qos_constraints latency_tolerance;
	struct freq_constraints freq;
	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;
}

s32 pm_qos_read_value(struct pm_qos_constraints *c);
int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
			 enum pm_qos_req_action action, int value);

Annotation

Implementation Notes