[mirror_ubuntu-artful-kernel.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/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);
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_read_value(struct device *dev)
{
	return IS_ERR_OR_NULL(dev->power.qos) ?
		0 : 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_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 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; }
static inline s32 dev_pm_qos_raw_read_value(struct device *dev) { return 0; }
#endif

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