[deliverable/linux.git] / include / linux / pm_qos.h

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

#endif
Commit	Line	Data
e8db0be1 JP	1	#ifndef _LINUX_PM_QOS_H
e8db0be1 JP	2	#define _LINUX_PM_QOS_H
d82b3518 MG	3	/* interface for the pm_qos_power infrastructure of the linux kernel.
d82b3518 MG	4	*
bf1db69f	5	* Mark Gross <mgross@linux.intel.com>
d82b3518	6	*/
82f68251	7	#include <linux/plist.h>
d82b3518 MG	8	#include <linux/notifier.h>
d82b3518 MG	9	#include <linux/miscdevice.h>
1a9a9152	10	#include <linux/device.h>
c4772d19	11	#include <linux/workqueue.h>
d82b3518	12
d031e1de AF	13	enum {
	14	PM_QOS_RESERVED = 0,
	15	PM_QOS_CPU_DMA_LATENCY,
	16	PM_QOS_NETWORK_LATENCY,
	17	PM_QOS_NETWORK_THROUGHPUT,
7990da71	18	PM_QOS_MEMORY_BANDWIDTH,
d031e1de AF	19
	20	/* insert new class ID */
	21	PM_QOS_NUM_CLASSES,
	22	};
d82b3518	23
ae0fb4b7 RW	24	enum pm_qos_flags_status {
	25	PM_QOS_FLAGS_UNDEFINED = -1,
	26	PM_QOS_FLAGS_NONE,
	27	PM_QOS_FLAGS_SOME,
	28	PM_QOS_FLAGS_ALL,
	29	};
	30
d82b3518 MG	31	#define PM_QOS_DEFAULT_VALUE -1
d82b3518 MG	32
333c5ae9 TC	33	#define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
	34	#define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
	35	#define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
7990da71	36	#define PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE 0
b02f6695	37	#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE 0
2d984ad1 RW	38	#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
	39	#define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
	40	#define PM_QOS_LATENCY_ANY ((s32)(~(__u32)0 >> 1))
333c5ae9	41
e39473d0 RW	42	#define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
	43	#define PM_QOS_FLAG_REMOTE_WAKEUP (1 << 1)
	44
cc749986 JP	45	struct pm_qos_request {
cc749986 JP	46	struct plist_node node;
82f68251	47	int pm_qos_class;
c4772d19	48	struct delayed_work work; /* for pm_qos_update_request_timeout */
82f68251	49	};
d82b3518	50
5efbe427 RW	51	struct pm_qos_flags_request {
	52	struct list_head node;
	53	s32 flags; /* Do not change to 64 bit */
	54	};
	55
ae0fb4b7	56	enum dev_pm_qos_req_type {
b02f6695	57	DEV_PM_QOS_RESUME_LATENCY = 1,
2d984ad1	58	DEV_PM_QOS_LATENCY_TOLERANCE,
ae0fb4b7 RW	59	DEV_PM_QOS_FLAGS,
	60	};
	61
91ff4cb8	62	struct dev_pm_qos_request {
ae0fb4b7	63	enum dev_pm_qos_req_type type;
021c870b RW	64	union {
021c870b RW	65	struct plist_node pnode;
ae0fb4b7	66	struct pm_qos_flags_request flr;
021c870b	67	} data;
91ff4cb8 JP	68	struct device *dev;
	69	};
	70
4e1779ba JP	71	enum pm_qos_type {
	72	PM_QOS_UNITIALIZED,
	73	PM_QOS_MAX, /* return the largest value */
7990da71 TV	74	PM_QOS_MIN, /* return the smallest value */
7990da71 TV	75	PM_QOS_SUM /* return the sum */
4e1779ba JP	76	};
	77
	78	/*
5efbe427 RW	79	* Note: The lockless read path depends on the CPU accessing target_value
5efbe427 RW	80	* or effective_flags atomically. Atomic access is only guaranteed on all CPU
4e1779ba JP	81	* types linux supports for 32 bit quantites
	82	*/
	83	struct pm_qos_constraints {
	84	struct plist_head list;
	85	s32 target_value; /* Do not change to 64 bit */
	86	s32 default_value;
327adaed	87	s32 no_constraint_value;
4e1779ba JP	88	enum pm_qos_type type;
	89	struct blocking_notifier_head *notifiers;
	90	};
	91
5efbe427 RW	92	struct pm_qos_flags {
	93	struct list_head list;
	94	s32 effective_flags; /* Do not change to 64 bit */
	95	};
	96
5f986c59	97	struct dev_pm_qos {
b02f6695	98	struct pm_qos_constraints resume_latency;
2d984ad1	99	struct pm_qos_constraints latency_tolerance;
ae0fb4b7	100	struct pm_qos_flags flags;
b02f6695	101	struct dev_pm_qos_request *resume_latency_req;
2d984ad1	102	struct dev_pm_qos_request *latency_tolerance_req;
e39473d0	103	struct dev_pm_qos_request *flags_req;
5f986c59 RW	104	};
5f986c59 RW	105
abe98ec2 JP	106	/* Action requested to pm_qos_update_target */
	107	enum pm_qos_req_action {
	108	PM_QOS_ADD_REQ, /* Add a new request */
	109	PM_QOS_UPDATE_REQ, /* Update an existing request */
	110	PM_QOS_REMOVE_REQ /* Remove an existing request */
	111	};
	112
91ff4cb8 JP	113	static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
91ff4cb8 JP	114	{
83618092	115	return req->dev != NULL;
91ff4cb8 JP	116	}
91ff4cb8 JP	117
abe98ec2 JP	118	int pm_qos_update_target(struct pm_qos_constraints c, struct plist_node node,
abe98ec2 JP	119	enum pm_qos_req_action action, int value);
5efbe427 RW	120	bool pm_qos_update_flags(struct pm_qos_flags *pqf,
	121	struct pm_qos_flags_request *req,
	122	enum pm_qos_req_action action, s32 val);
cc749986 JP	123	void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
	124	s32 value);
	125	void pm_qos_update_request(struct pm_qos_request *req,
e8db0be1	126	s32 new_value);
c4772d19 MH	127	void pm_qos_update_request_timeout(struct pm_qos_request *req,
c4772d19 MH	128	s32 new_value, unsigned long timeout_us);
cc749986	129	void pm_qos_remove_request(struct pm_qos_request *req);
d82b3518	130
ed77134b MG	131	int pm_qos_request(int pm_qos_class);
	132	int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
	133	int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
cc749986	134	int pm_qos_request_active(struct pm_qos_request *req);
b66213cd	135	s32 pm_qos_read_value(struct pm_qos_constraints *c);
91ff4cb8	136
a9b542ee	137	#ifdef CONFIG_PM
ae0fb4b7 RW	138	enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
ae0fb4b7 RW	139	enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
00dc9ad1	140	s32 __dev_pm_qos_read_value(struct device *dev);
1a9a9152	141	s32 dev_pm_qos_read_value(struct device *dev);
91ff4cb8	142	int dev_pm_qos_add_request(struct device dev, struct dev_pm_qos_request req,
ae0fb4b7	143	enum dev_pm_qos_req_type type, s32 value);
91ff4cb8 JP	144	int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
	145	int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
	146	int dev_pm_qos_add_notifier(struct device *dev,
	147	struct notifier_block *notifier);
	148	int dev_pm_qos_remove_notifier(struct device *dev,
	149	struct notifier_block *notifier);
b66213cd JP	150	int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
b66213cd JP	151	int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
91ff4cb8 JP	152	void dev_pm_qos_constraints_init(struct device *dev);
91ff4cb8 JP	153	void dev_pm_qos_constraints_destroy(struct device *dev);
40a5f8be	154	int dev_pm_qos_add_ancestor_request(struct device *dev,
71d821fd RW	155	struct dev_pm_qos_request *req,
71d821fd RW	156	enum dev_pm_qos_req_type type, s32 value);
d30d819d RW	157	int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
	158	void dev_pm_qos_hide_latency_limit(struct device *dev);
	159	int dev_pm_qos_expose_flags(struct device *dev, s32 value);
	160	void dev_pm_qos_hide_flags(struct device *dev);
	161	int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
	162	s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
	163	int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
13b2c4a0 MW	164	int dev_pm_qos_expose_latency_tolerance(struct device *dev);
13b2c4a0 MW	165	void dev_pm_qos_hide_latency_tolerance(struct device *dev);
d30d819d RW	166
	167	static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
	168	{
	169	return dev->power.qos->resume_latency_req->data.pnode.prio;
	170	}
	171
	172	static inline s32 dev_pm_qos_requested_flags(struct device *dev)
	173	{
	174	return dev->power.qos->flags_req->data.flr.flags;
	175	}
e8db0be1	176	#else
ae0fb4b7 RW	177	static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
	178	s32 mask)
	179	{ return PM_QOS_FLAGS_UNDEFINED; }
	180	static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
	181	s32 mask)
	182	{ return PM_QOS_FLAGS_UNDEFINED; }
00dc9ad1 RW	183	static inline s32 __dev_pm_qos_read_value(struct device *dev)
00dc9ad1 RW	184	{ return 0; }
1a9a9152 RW	185	static inline s32 dev_pm_qos_read_value(struct device *dev)
1a9a9152 RW	186	{ return 0; }
91ff4cb8 JP	187	static inline int dev_pm_qos_add_request(struct device *dev,
91ff4cb8 JP	188	struct dev_pm_qos_request *req,
ae0fb4b7	189	enum dev_pm_qos_req_type type,
91ff4cb8 JP	190	s32 value)
	191	{ return 0; }
	192	static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
	193	s32 new_value)
	194	{ return 0; }
	195	static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
	196	{ return 0; }
	197	static inline int dev_pm_qos_add_notifier(struct device *dev,
	198	struct notifier_block *notifier)
	199	{ return 0; }
	200	static inline int dev_pm_qos_remove_notifier(struct device *dev,
	201	struct notifier_block *notifier)
	202	{ return 0; }
b66213cd JP	203	static inline int dev_pm_qos_add_global_notifier(
	204	struct notifier_block *notifier)
	205	{ return 0; }
	206	static inline int dev_pm_qos_remove_global_notifier(
	207	struct notifier_block *notifier)
	208	{ return 0; }
91ff4cb8	209	static inline void dev_pm_qos_constraints_init(struct device *dev)
1a9a9152 RW	210	{
	211	dev->power.power_state = PMSG_ON;
	212	}
91ff4cb8	213	static inline void dev_pm_qos_constraints_destroy(struct device *dev)
1a9a9152 RW	214	{
	215	dev->power.power_state = PMSG_INVALID;
	216	}
40a5f8be	217	static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
71d821fd RW	218	struct dev_pm_qos_request *req,
	219	enum dev_pm_qos_req_type type,
	220	s32 value)
40a5f8be	221	{ return 0; }
85dc0b8a RW	222	static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
	223	{ return 0; }
	224	static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
e39473d0 RW	225	static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
	226	{ return 0; }
	227	static inline void dev_pm_qos_hide_flags(struct device *dev) {}
	228	static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
	229	{ return 0; }
2d984ad1 RW	230	static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
	231	{ return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
	232	static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
	233	{ return 0; }
13b2c4a0 MW	234	static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
	235	{ return 0; }
	236	static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
e39473d0	237
b02f6695	238	static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev) { return 0; }
e39473d0	239	static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
85dc0b8a RW	240	#endif
85dc0b8a RW	241
82f68251	242	#endif