[linux-block.git] / include / linux / pm_qos.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Definitions related to Power Management Quality of Service (PM QoS).
 *
 * Copyright (C) 2020 Intel Corporation
 *
 * Authors:
 *	Mark Gross <mgross@linux.intel.com>
 *	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 */

#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 {
	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_LATENCY_ANY	S32_MAX
#define PM_QOS_LATENCY_ANY_NS	((s64)PM_QOS_LATENCY_ANY * NSEC_PER_USEC)

#define PM_QOS_CPU_LATENCY_DEFAULT_VALUE	(2000 * USEC_PER_SEC)
#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE	PM_QOS_LATENCY_ANY
#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT	PM_QOS_LATENCY_ANY
#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS	PM_QOS_LATENCY_ANY_NS
#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE	0
#define PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE	0
#define PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE	FREQ_QOS_MAX_DEFAULT_VALUE
#define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT	(-1)

#define PM_QOS_FLAG_NO_POWER_OFF	(1 << 0)

enum pm_qos_type {
	PM_QOS_UNITIALIZED,
	PM_QOS_MAX,		/* return the largest value */
	PM_QOS_MIN,		/* return the smallest value */
};

/*
 * 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_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);
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)
{
	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;
}

static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
{
	return IS_ERR_OR_NULL(dev->power.qos) ?
		PM_QOS_RESUME_LATENCY_NO_CONSTRAINT :
		pm_qos_read_value(&dev->power.qos->resume_latency);
}
#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)
{
	return !IS_ERR_OR_NULL(req->qos);
}

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
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/*
	3	* Definitions related to Power Management Quality of Service (PM QoS).
	4	*
	5	* Copyright (C) 2020 Intel Corporation
	6	*
	7	* Authors:
	8	* Mark Gross <mgross@linux.intel.com>
	9	* Rafael J. Wysocki <rafael.j.wysocki@intel.com>
	10	*/
	11
	12	#ifndef _LINUX_PM_QOS_H
	13	#define _LINUX_PM_QOS_H
	14
	15	#include <linux/plist.h>
	16	#include <linux/notifier.h>
	17	#include <linux/device.h>
	18
	19	enum pm_qos_flags_status {
	20	PM_QOS_FLAGS_UNDEFINED = -1,
	21	PM_QOS_FLAGS_NONE,
	22	PM_QOS_FLAGS_SOME,
	23	PM_QOS_FLAGS_ALL,
	24	};
	25
	26	#define PM_QOS_DEFAULT_VALUE (-1)
	27	#define PM_QOS_LATENCY_ANY S32_MAX
	28	#define PM_QOS_LATENCY_ANY_NS ((s64)PM_QOS_LATENCY_ANY * NSEC_PER_USEC)
	29
	30	#define PM_QOS_CPU_LATENCY_DEFAULT_VALUE (2000 * USEC_PER_SEC)
	31	#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE PM_QOS_LATENCY_ANY
	32	#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT PM_QOS_LATENCY_ANY
	33	#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS PM_QOS_LATENCY_ANY_NS
	34	#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
	35	#define PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE 0
	36	#define PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE FREQ_QOS_MAX_DEFAULT_VALUE
	37	#define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
	38
	39	#define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
	40
	41	enum 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 target_value
	49	* or effective_flags atomically. Atomic access is only guaranteed on all CPU
	50	* types linux supports for 32 bit quantites
	51	*/
	52	struct pm_qos_constraints {
	53	struct plist_head list;
	54	s32 target_value; /* Do not change to 64 bit */
	55	s32 default_value;
	56	s32 no_constraint_value;
	57	enum pm_qos_type type;
	58	struct blocking_notifier_head *notifiers;
	59	};
	60
	61	struct pm_qos_request {
	62	struct plist_node node;
	63	struct pm_qos_constraints *qos;
	64	};
	65
	66	struct pm_qos_flags_request {
	67	struct list_head node;
	68	s32 flags; /* Do not change to 64 bit */
	69	};
	70
	71	struct pm_qos_flags {
	72	struct list_head list;
	73	s32 effective_flags; /* Do not change to 64 bit */
	74	};
	75
	76
	77	#define FREQ_QOS_MIN_DEFAULT_VALUE 0
	78	#define FREQ_QOS_MAX_DEFAULT_VALUE S32_MAX
	79
	80	enum freq_qos_req_type {
	81	FREQ_QOS_MIN = 1,
	82	FREQ_QOS_MAX,
	83	};
	84
	85	struct freq_constraints {
	86	struct pm_qos_constraints min_freq;
	87	struct blocking_notifier_head min_freq_notifiers;
	88	struct pm_qos_constraints max_freq;
	89	struct blocking_notifier_head max_freq_notifiers;
	90	};
	91
	92	struct freq_qos_request {
	93	enum freq_qos_req_type type;
	94	struct plist_node pnode;
	95	struct freq_constraints *qos;
	96	};
	97
	98
	99	enum dev_pm_qos_req_type {
	100	DEV_PM_QOS_RESUME_LATENCY = 1,
	101	DEV_PM_QOS_LATENCY_TOLERANCE,
	102	DEV_PM_QOS_MIN_FREQUENCY,
	103	DEV_PM_QOS_MAX_FREQUENCY,
	104	DEV_PM_QOS_FLAGS,
	105	};
	106
	107	struct dev_pm_qos_request {
	108	enum dev_pm_qos_req_type type;
	109	union {
	110	struct plist_node pnode;
	111	struct pm_qos_flags_request flr;
	112	struct freq_qos_request freq;
	113	} data;
	114	struct device *dev;
	115	};
	116
	117	struct dev_pm_qos {
	118	struct pm_qos_constraints resume_latency;
	119	struct pm_qos_constraints latency_tolerance;
	120	struct freq_constraints freq;
	121	struct pm_qos_flags flags;
	122	struct dev_pm_qos_request *resume_latency_req;
	123	struct dev_pm_qos_request *latency_tolerance_req;
	124	struct dev_pm_qos_request *flags_req;
	125	};
	126
	127	/* Action requested to pm_qos_update_target */
	128	enum pm_qos_req_action {
	129	PM_QOS_ADD_REQ, /* Add a new request */
	130	PM_QOS_UPDATE_REQ, /* Update an existing request */
	131	PM_QOS_REMOVE_REQ /* Remove an existing request */
	132	};
	133
	134	static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
	135	{
	136	return req->dev != NULL;
	137	}
	138
	139	s32 pm_qos_read_value(struct pm_qos_constraints *c);
	140	int pm_qos_update_target(struct pm_qos_constraints c, struct plist_node node,
	141	enum pm_qos_req_action action, int value);
	142	bool pm_qos_update_flags(struct pm_qos_flags *pqf,
	143	struct pm_qos_flags_request *req,
	144	enum pm_qos_req_action action, s32 val);
	145
	146	#ifdef CONFIG_CPU_IDLE
	147	s32 cpu_latency_qos_limit(void);
	148	bool cpu_latency_qos_request_active(struct pm_qos_request *req);
	149	void cpu_latency_qos_add_request(struct pm_qos_request *req, s32 value);
	150	void cpu_latency_qos_update_request(struct pm_qos_request *req, s32 new_value);
	151	void cpu_latency_qos_remove_request(struct pm_qos_request *req);
	152	#else
	153	static inline s32 cpu_latency_qos_limit(void) { return INT_MAX; }
	154	static inline bool cpu_latency_qos_request_active(struct pm_qos_request *req)
	155	{
	156	return false;
	157	}
	158	static inline void cpu_latency_qos_add_request(struct pm_qos_request *req,
	159	s32 value) {}
	160	static inline void cpu_latency_qos_update_request(struct pm_qos_request *req,
	161	s32 new_value) {}
	162	static inline void cpu_latency_qos_remove_request(struct pm_qos_request *req) {}
	163	#endif
	164
	165	#ifdef CONFIG_PM
	166	enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
	167	enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
	168	s32 __dev_pm_qos_resume_latency(struct device *dev);
	169	s32 dev_pm_qos_read_value(struct device *dev, enum dev_pm_qos_req_type type);
	170	int dev_pm_qos_add_request(struct device dev, struct dev_pm_qos_request req,
	171	enum dev_pm_qos_req_type type, s32 value);
	172	int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
	173	int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
	174	int dev_pm_qos_add_notifier(struct device *dev,
	175	struct notifier_block *notifier,
	176	enum dev_pm_qos_req_type type);
	177	int dev_pm_qos_remove_notifier(struct device *dev,
	178	struct notifier_block *notifier,
	179	enum dev_pm_qos_req_type type);
	180	void dev_pm_qos_constraints_init(struct device *dev);
	181	void dev_pm_qos_constraints_destroy(struct device *dev);
	182	int dev_pm_qos_add_ancestor_request(struct device *dev,
	183	struct dev_pm_qos_request *req,
	184	enum dev_pm_qos_req_type type, s32 value);
	185	int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
	186	void dev_pm_qos_hide_latency_limit(struct device *dev);
	187	int dev_pm_qos_expose_flags(struct device *dev, s32 value);
	188	void dev_pm_qos_hide_flags(struct device *dev);
	189	int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
	190	s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
	191	int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
	192	int dev_pm_qos_expose_latency_tolerance(struct device *dev);
	193	void dev_pm_qos_hide_latency_tolerance(struct device *dev);
	194
	195	static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
	196	{
	197	return dev->power.qos->resume_latency_req->data.pnode.prio;
	198	}
	199
	200	static inline s32 dev_pm_qos_requested_flags(struct device *dev)
	201	{
	202	return dev->power.qos->flags_req->data.flr.flags;
	203	}
	204
	205	static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
	206	{
	207	return IS_ERR_OR_NULL(dev->power.qos) ?
	208	PM_QOS_RESUME_LATENCY_NO_CONSTRAINT :
	209	pm_qos_read_value(&dev->power.qos->resume_latency);
	210	}
	211	#else
	212	static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
	213	s32 mask)
	214	{ return PM_QOS_FLAGS_UNDEFINED; }
	215	static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
	216	s32 mask)
	217	{ return PM_QOS_FLAGS_UNDEFINED; }
	218	static inline s32 __dev_pm_qos_resume_latency(struct device *dev)
	219	{ return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
	220	static inline s32 dev_pm_qos_read_value(struct device *dev,
	221	enum dev_pm_qos_req_type type)
	222	{
	223	switch (type) {
	224	case DEV_PM_QOS_RESUME_LATENCY:
	225	return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
	226	case DEV_PM_QOS_MIN_FREQUENCY:
	227	return PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE;
	228	case DEV_PM_QOS_MAX_FREQUENCY:
	229	return PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE;
	230	default:
	231	WARN_ON(1);
	232	return 0;
	233	}
	234	}
	235
	236	static inline int dev_pm_qos_add_request(struct device *dev,
	237	struct dev_pm_qos_request *req,
	238	enum dev_pm_qos_req_type type,
	239	s32 value)
	240	{ return 0; }
	241	static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
	242	s32 new_value)
	243	{ return 0; }
	244	static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
	245	{ return 0; }
	246	static inline int dev_pm_qos_add_notifier(struct device *dev,
	247	struct notifier_block *notifier,
	248	enum dev_pm_qos_req_type type)
	249	{ return 0; }
	250	static inline int dev_pm_qos_remove_notifier(struct device *dev,
	251	struct notifier_block *notifier,
	252	enum dev_pm_qos_req_type type)
	253	{ return 0; }
	254	static inline void dev_pm_qos_constraints_init(struct device *dev)
	255	{
	256	dev->power.power_state = PMSG_ON;
	257	}
	258	static inline void dev_pm_qos_constraints_destroy(struct device *dev)
	259	{
	260	dev->power.power_state = PMSG_INVALID;
	261	}
	262	static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
	263	struct dev_pm_qos_request *req,
	264	enum dev_pm_qos_req_type type,
	265	s32 value)
	266	{ return 0; }
	267	static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
	268	{ return 0; }
	269	static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
	270	static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
	271	{ return 0; }
	272	static inline void dev_pm_qos_hide_flags(struct device *dev) {}
	273	static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
	274	{ return 0; }
	275	static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
	276	{ return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
	277	static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
	278	{ return 0; }
	279	static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
	280	{ return 0; }
	281	static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
	282
	283	static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
	284	{
	285	return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
	286	}
	287	static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
	288	static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
	289	{
	290	return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
	291	}
	292	#endif
	293
	294	static inline int freq_qos_request_active(struct freq_qos_request *req)
	295	{
	296	return !IS_ERR_OR_NULL(req->qos);
	297	}
	298
	299	void freq_constraints_init(struct freq_constraints *qos);
	300
	301	s32 freq_qos_read_value(struct freq_constraints *qos,
	302	enum freq_qos_req_type type);
	303
	304	int freq_qos_add_request(struct freq_constraints *qos,
	305	struct freq_qos_request *req,
	306	enum freq_qos_req_type type, s32 value);
	307	int freq_qos_update_request(struct freq_qos_request *req, s32 new_value);
	308	int freq_qos_remove_request(struct freq_qos_request *req);
	309	int freq_qos_apply(struct freq_qos_request *req,
	310	enum pm_qos_req_action action, s32 value);
	311
	312	int freq_qos_add_notifier(struct freq_constraints *qos,
	313	enum freq_qos_req_type type,
	314	struct notifier_block *notifier);
	315	int freq_qos_remove_notifier(struct freq_constraints *qos,
	316	enum freq_qos_req_type type,
	317	struct notifier_block *notifier);
	318
	319	#endif