pm_qos.h | Explore in Territory

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Definitions related to Power Management Quality of Service (PM QoS).
 *
 * Copyright (C) 2020 Intel Corporation
 *
 * Authors:
 *	Mark Gross <[email protected]>
 *	Rafael J. Wysocki <[email protected]>
 */

#ifndef _LINUX_PM_QOS_H
#define _LINUX_PM_QOS_H

#include <linux/plist.h>
#include <linux/notifier.h>
#include <linux/device.h>

enum pm_qos_flags_status { … };

#define PM_QOS_DEFAULT_VALUE …
#define PM_QOS_LATENCY_ANY …
#define PM_QOS_LATENCY_ANY_NS …

#define PM_QOS_CPU_LATENCY_DEFAULT_VALUE …
#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE …
#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT …
#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS …
#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE …
#define PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE …
#define PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE …
#define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT …

#define PM_QOS_FLAG_NO_POWER_OFF …

enum pm_qos_type { … };

/*
 * 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 pm_qos_request { … };

struct pm_qos_flags_request { … };

struct pm_qos_flags { … };


#define FREQ_QOS_MIN_DEFAULT_VALUE …
#define FREQ_QOS_MAX_DEFAULT_VALUE …

enum freq_qos_req_type { … };

struct freq_constraints { … };

struct freq_qos_request { … };


enum dev_pm_qos_req_type { … };

struct dev_pm_qos_request { … };

struct dev_pm_qos { … };

/* Action requested to pm_qos_update_target */
enum pm_qos_req_action { … };

static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
{ … }

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);
bool pm_qos_update_flags(struct pm_qos_flags *pqf,
			 struct pm_qos_flags_request *req,
			 enum pm_qos_req_action action, s32 val);

#ifdef CONFIG_CPU_IDLE
s32 cpu_latency_qos_limit(void);
bool cpu_latency_qos_request_active(struct pm_qos_request *req);
void cpu_latency_qos_add_request(struct pm_qos_request *req, s32 value);
void cpu_latency_qos_update_request(struct pm_qos_request *req, s32 new_value);
void cpu_latency_qos_remove_request(struct pm_qos_request *req);
#else
static inline s32 cpu_latency_qos_limit(void) { return INT_MAX; }
static inline bool cpu_latency_qos_request_active(struct pm_qos_request *req)
{
	return false;
}
static inline void cpu_latency_qos_add_request(struct pm_qos_request *req,
					       s32 value) {}
static inline void cpu_latency_qos_update_request(struct pm_qos_request *req,
						  s32 new_value) {}
static inline void cpu_latency_qos_remove_request(struct pm_qos_request *req) {}
#endif

#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_resume_latency(struct device *dev);
s32 dev_pm_qos_read_value(struct device *dev, enum dev_pm_qos_req_type type);
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,
			    enum dev_pm_qos_req_type type);
int dev_pm_qos_remove_notifier(struct device *dev,
			       struct notifier_block *notifier,
			       enum dev_pm_qos_req_type type);
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);
int dev_pm_qos_expose_latency_tolerance(struct device *dev);
void dev_pm_qos_hide_latency_tolerance(struct device *dev);

static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
{ … }

static inline s32 dev_pm_qos_requested_flags(struct device *dev)
{ … }

static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
{ … }
#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_resume_latency(struct device *dev)
			{ return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
static inline s32 dev_pm_qos_read_value(struct device *dev,
					enum dev_pm_qos_req_type type)
{
	switch (type) {
	case DEV_PM_QOS_RESUME_LATENCY:
		return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
	case DEV_PM_QOS_MIN_FREQUENCY:
		return PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE;
	case DEV_PM_QOS_MAX_FREQUENCY:
		return PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE;
	default:
		WARN_ON(1);
		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,
					  enum dev_pm_qos_req_type type)
			{ return 0; }
static inline int dev_pm_qos_remove_notifier(struct device *dev,
					     struct notifier_block *notifier,
					     enum dev_pm_qos_req_type type)
			{ 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 int dev_pm_qos_expose_latency_tolerance(struct device *dev)
			{ return 0; }
static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}

static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
{
	return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
}
static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
{
	return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
}
#endif

static inline int freq_qos_request_active(struct freq_qos_request *req)
{ … }

void freq_constraints_init(struct freq_constraints *qos);

s32 freq_qos_read_value(struct freq_constraints *qos,
			enum freq_qos_req_type type);

int freq_qos_add_request(struct freq_constraints *qos,
			 struct freq_qos_request *req,
			 enum freq_qos_req_type type, s32 value);
int freq_qos_update_request(struct freq_qos_request *req, s32 new_value);
int freq_qos_remove_request(struct freq_qos_request *req);
int freq_qos_apply(struct freq_qos_request *req,
		   enum pm_qos_req_action action, s32 value);

int freq_qos_add_notifier(struct freq_constraints *qos,
			  enum freq_qos_req_type type,
			  struct notifier_block *notifier);
int freq_qos_remove_notifier(struct freq_constraints *qos,
			     enum freq_qos_req_type type,
			     struct notifier_block *notifier);

#endif
linux/include/linux/pm_qos.h
