[GitHub/mt8127/android_kernel_alcatel_ttab.git] / block / blk-cgroup.h

#ifndef _BLK_CGROUP_H
#define _BLK_CGROUP_H
/*
 * Common Block IO controller cgroup interface
 *
 * Based on ideas and code from CFQ, CFS and BFQ:
 * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
 *
 * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
 *		      Paolo Valente <paolo.valente@unimore.it>
 *
 * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
 * 	              Nauman Rafique <nauman@google.com>
 */

#include <linux/cgroup.h>

enum blkio_policy_id {
	BLKIO_POLICY_PROP = 0,		/* Proportional Bandwidth division */
	BLKIO_POLICY_THROTL,		/* Throttling */
};

/* Max limits for throttle policy */
#define THROTL_IOPS_MAX		UINT_MAX

#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)

#ifndef CONFIG_BLK_CGROUP
/* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */
extern struct cgroup_subsys blkio_subsys;
#define blkio_subsys_id blkio_subsys.subsys_id
#endif

enum stat_type {
	/* Total time spent (in ns) between request dispatch to the driver and
	 * request completion for IOs doen by this cgroup. This may not be
	 * accurate when NCQ is turned on. */
	BLKIO_STAT_SERVICE_TIME = 0,
	/* Total bytes transferred */
	BLKIO_STAT_SERVICE_BYTES,
	/* Total IOs serviced, post merge */
	BLKIO_STAT_SERVICED,
	/* Total time spent waiting in scheduler queue in ns */
	BLKIO_STAT_WAIT_TIME,
	/* Number of IOs merged */
	BLKIO_STAT_MERGED,
	/* Number of IOs queued up */
	BLKIO_STAT_QUEUED,
	/* All the single valued stats go below this */
	BLKIO_STAT_TIME,
	BLKIO_STAT_SECTORS,
	/* Time not charged to this cgroup */
	BLKIO_STAT_UNACCOUNTED_TIME,
#ifdef CONFIG_DEBUG_BLK_CGROUP
	BLKIO_STAT_AVG_QUEUE_SIZE,
	BLKIO_STAT_IDLE_TIME,
	BLKIO_STAT_EMPTY_TIME,
	BLKIO_STAT_GROUP_WAIT_TIME,
	BLKIO_STAT_DEQUEUE
#endif
};

enum stat_sub_type {
	BLKIO_STAT_READ = 0,
	BLKIO_STAT_WRITE,
	BLKIO_STAT_SYNC,
	BLKIO_STAT_ASYNC,
	BLKIO_STAT_TOTAL
};

/* blkg state flags */
enum blkg_state_flags {
	BLKG_waiting = 0,
	BLKG_idling,
	BLKG_empty,
};

/* cgroup files owned by proportional weight policy */
enum blkcg_file_name_prop {
	BLKIO_PROP_weight = 1,
	BLKIO_PROP_weight_device,
	BLKIO_PROP_io_service_bytes,
	BLKIO_PROP_io_serviced,
	BLKIO_PROP_time,
	BLKIO_PROP_sectors,
	BLKIO_PROP_unaccounted_time,
	BLKIO_PROP_io_service_time,
	BLKIO_PROP_io_wait_time,
	BLKIO_PROP_io_merged,
	BLKIO_PROP_io_queued,
	BLKIO_PROP_avg_queue_size,
	BLKIO_PROP_group_wait_time,
	BLKIO_PROP_idle_time,
	BLKIO_PROP_empty_time,
	BLKIO_PROP_dequeue,
};

/* cgroup files owned by throttle policy */
enum blkcg_file_name_throtl {
	BLKIO_THROTL_read_bps_device,
	BLKIO_THROTL_write_bps_device,
	BLKIO_THROTL_read_iops_device,
	BLKIO_THROTL_write_iops_device,
	BLKIO_THROTL_io_service_bytes,
	BLKIO_THROTL_io_serviced,
};

struct blkio_cgroup {
	struct cgroup_subsys_state css;
	unsigned int weight;
	spinlock_t lock;
	struct hlist_head blkg_list;
	struct list_head policy_list; /* list of blkio_policy_node */
};

struct blkio_group_stats {
	/* total disk time and nr sectors dispatched by this group */
	uint64_t time;
	uint64_t sectors;
	/* Time not charged to this cgroup */
	uint64_t unaccounted_time;
	uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
#ifdef CONFIG_DEBUG_BLK_CGROUP
	/* Sum of number of IOs queued across all samples */
	uint64_t avg_queue_size_sum;
	/* Count of samples taken for average */
	uint64_t avg_queue_size_samples;
	/* How many times this group has been removed from service tree */
	unsigned long dequeue;

	/* Total time spent waiting for it to be assigned a timeslice. */
	uint64_t group_wait_time;
	uint64_t start_group_wait_time;

	/* Time spent idling for this blkio_group */
	uint64_t idle_time;
	uint64_t start_idle_time;
	/*
	 * Total time when we have requests queued and do not contain the
	 * current active queue.
	 */
	uint64_t empty_time;
	uint64_t start_empty_time;
	uint16_t flags;
#endif
};

struct blkio_group {
	/* An rcu protected unique identifier for the group */
	void *key;
	struct hlist_node blkcg_node;
	unsigned short blkcg_id;
	/* Store cgroup path */
	char path[128];
	/* The device MKDEV(major, minor), this group has been created for */
	dev_t dev;
	/* policy which owns this blk group */
	enum blkio_policy_id plid;

	/* Need to serialize the stats in the case of reset/update */
	spinlock_t stats_lock;
	struct blkio_group_stats stats;
};

struct blkio_policy_node {
	struct list_head node;
	dev_t dev;
	/* This node belongs to max bw policy or porportional weight policy */
	enum blkio_policy_id plid;
	/* cgroup file to which this rule belongs to */
	int fileid;

	union {
		unsigned int weight;
		/*
		 * Rate read/write in terms of byptes per second
		 * Whether this rate represents read or write is determined
		 * by file type "fileid".
		 */
		u64 bps;
		unsigned int iops;
	} val;
};

extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
				     dev_t dev);
extern uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg,
				     dev_t dev);
extern uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg,
				     dev_t dev);
extern unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg,
				     dev_t dev);
extern unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg,
				     dev_t dev);

typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg);

typedef void (blkio_update_group_weight_fn) (void *key,
			struct blkio_group *blkg, unsigned int weight);
typedef void (blkio_update_group_read_bps_fn) (void * key,
			struct blkio_group *blkg, u64 read_bps);
typedef void (blkio_update_group_write_bps_fn) (void *key,
			struct blkio_group *blkg, u64 write_bps);
typedef void (blkio_update_group_read_iops_fn) (void *key,
			struct blkio_group *blkg, unsigned int read_iops);
typedef void (blkio_update_group_write_iops_fn) (void *key,
			struct blkio_group *blkg, unsigned int write_iops);

struct blkio_policy_ops {
	blkio_unlink_group_fn *blkio_unlink_group_fn;
	blkio_update_group_weight_fn *blkio_update_group_weight_fn;
	blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn;
	blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn;
	blkio_update_group_read_iops_fn *blkio_update_group_read_iops_fn;
	blkio_update_group_write_iops_fn *blkio_update_group_write_iops_fn;
};

struct blkio_policy_type {
	struct list_head list;
	struct blkio_policy_ops ops;
	enum blkio_policy_id plid;
};

/* Blkio controller policy registration */
extern void blkio_policy_register(struct blkio_policy_type *);
extern void blkio_policy_unregister(struct blkio_policy_type *);

static inline char *blkg_path(struct blkio_group *blkg)
{
	return blkg->path;
}

#else

struct blkio_group {
};

struct blkio_policy_type {
};

static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }

static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }

#endif

#define BLKIO_WEIGHT_MIN	10
#define BLKIO_WEIGHT_MAX	1000
#define BLKIO_WEIGHT_DEFAULT	500

#ifdef CONFIG_DEBUG_BLK_CGROUP
void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
				unsigned long dequeue);
void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
void blkiocg_set_start_empty_time(struct blkio_group *blkg);

#define BLKG_FLAG_FNS(name)						\
static inline void blkio_mark_blkg_##name(				\
		struct blkio_group_stats *stats)			\
{									\
	stats->flags |= (1 << BLKG_##name);				\
}									\
static inline void blkio_clear_blkg_##name(				\
		struct blkio_group_stats *stats)			\
{									\
	stats->flags &= ~(1 << BLKG_##name);				\
}									\
static inline int blkio_blkg_##name(struct blkio_group_stats *stats)	\
{									\
	return (stats->flags & (1 << BLKG_##name)) != 0;		\
}									\

BLKG_FLAG_FNS(waiting)
BLKG_FLAG_FNS(idling)
BLKG_FLAG_FNS(empty)
#undef BLKG_FLAG_FNS
#else
static inline void blkiocg_update_avg_queue_size_stats(
						struct blkio_group *blkg) {}
static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
						unsigned long dequeue) {}
static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
{}
static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
#endif

#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
extern struct blkio_cgroup blkio_root_cgroup;
extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
extern struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk);
extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
	struct blkio_group *blkg, void *key, dev_t dev,
	enum blkio_policy_id plid);
extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg,
						void *key);
void blkiocg_update_timeslice_used(struct blkio_group *blkg,
					unsigned long time,
					unsigned long unaccounted_time);
void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
						bool direction, bool sync);
void blkiocg_update_completion_stats(struct blkio_group *blkg,
	uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
					bool sync);
void blkiocg_update_io_add_stats(struct blkio_group *blkg,
		struct blkio_group *curr_blkg, bool direction, bool sync);
void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
					bool direction, bool sync);
#else
struct cgroup;
static inline struct blkio_cgroup *
cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
static inline struct blkio_cgroup *
task_blkio_cgroup(struct task_struct *tsk) { return NULL; }

static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
		struct blkio_group *blkg, void *key, dev_t dev,
		enum blkio_policy_id plid) {}

static inline int
blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }

static inline struct blkio_group *
blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; }
static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
						unsigned long time,
						unsigned long unaccounted_time)
{}
static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
				uint64_t bytes, bool direction, bool sync) {}
static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
		uint64_t start_time, uint64_t io_start_time, bool direction,
		bool sync) {}
static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
						bool direction, bool sync) {}
static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
		struct blkio_group *curr_blkg, bool direction, bool sync) {}
static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
						bool direction, bool sync) {}
#endif
#endif /* _BLK_CGROUP_H */
Commit	Line	Data
31e4c28d VG	1	#ifndef _BLK_CGROUP_H
	2	#define _BLK_CGROUP_H
	3	/*
	4	* Common Block IO controller cgroup interface
	5	*
	6	* Based on ideas and code from CFQ, CFS and BFQ:
	7	* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
	8	*
	9	* Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
	10	* Paolo Valente <paolo.valente@unimore.it>
	11	*
	12	* Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
	13	* Nauman Rafique <nauman@google.com>
	14	*/
	15
	16	#include <linux/cgroup.h>
	17
062a644d VG	18	enum blkio_policy_id {
062a644d VG	19	BLKIO_POLICY_PROP = 0, /* Proportional Bandwidth division */
4c9eefa1	20	BLKIO_POLICY_THROTL, /* Throttling */
062a644d VG	21	};
062a644d VG	22
9355aede VG	23	/* Max limits for throttle policy */
	24	#define THROTL_IOPS_MAX UINT_MAX
	25
67523c48 BB	26	#if defined(CONFIG_BLK_CGROUP) \|\| defined(CONFIG_BLK_CGROUP_MODULE)
	27
	28	#ifndef CONFIG_BLK_CGROUP
	29	/* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */
	30	extern struct cgroup_subsys blkio_subsys;
	31	#define blkio_subsys_id blkio_subsys.subsys_id
	32	#endif
2f5ea477	33
84c124da DS	34	enum stat_type {
	35	/* Total time spent (in ns) between request dispatch to the driver and
	36	* request completion for IOs doen by this cgroup. This may not be
	37	* accurate when NCQ is turned on. */
	38	BLKIO_STAT_SERVICE_TIME = 0,
	39	/* Total bytes transferred */
	40	BLKIO_STAT_SERVICE_BYTES,
	41	/* Total IOs serviced, post merge */
	42	BLKIO_STAT_SERVICED,
	43	/* Total time spent waiting in scheduler queue in ns */
	44	BLKIO_STAT_WAIT_TIME,
812d4026 DS	45	/* Number of IOs merged */
812d4026 DS	46	BLKIO_STAT_MERGED,
cdc1184c DS	47	/* Number of IOs queued up */
cdc1184c DS	48	BLKIO_STAT_QUEUED,
84c124da DS	49	/* All the single valued stats go below this */
	50	BLKIO_STAT_TIME,
	51	BLKIO_STAT_SECTORS,
167400d3 JT	52	/* Time not charged to this cgroup */
167400d3 JT	53	BLKIO_STAT_UNACCOUNTED_TIME,
84c124da	54	#ifdef CONFIG_DEBUG_BLK_CGROUP
cdc1184c	55	BLKIO_STAT_AVG_QUEUE_SIZE,
812df48d DS	56	BLKIO_STAT_IDLE_TIME,
	57	BLKIO_STAT_EMPTY_TIME,
	58	BLKIO_STAT_GROUP_WAIT_TIME,
84c124da DS	59	BLKIO_STAT_DEQUEUE
	60	#endif
	61	};
	62
	63	enum stat_sub_type {
	64	BLKIO_STAT_READ = 0,
	65	BLKIO_STAT_WRITE,
	66	BLKIO_STAT_SYNC,
	67	BLKIO_STAT_ASYNC,
	68	BLKIO_STAT_TOTAL
303a3acb DS	69	};
303a3acb DS	70
812df48d DS	71	/* blkg state flags */
	72	enum blkg_state_flags {
	73	BLKG_waiting = 0,
	74	BLKG_idling,
	75	BLKG_empty,
	76	};
	77
062a644d VG	78	/* cgroup files owned by proportional weight policy */
	79	enum blkcg_file_name_prop {
	80	BLKIO_PROP_weight = 1,
	81	BLKIO_PROP_weight_device,
	82	BLKIO_PROP_io_service_bytes,
	83	BLKIO_PROP_io_serviced,
	84	BLKIO_PROP_time,
	85	BLKIO_PROP_sectors,
167400d3	86	BLKIO_PROP_unaccounted_time,
062a644d VG	87	BLKIO_PROP_io_service_time,
	88	BLKIO_PROP_io_wait_time,
	89	BLKIO_PROP_io_merged,
	90	BLKIO_PROP_io_queued,
	91	BLKIO_PROP_avg_queue_size,
	92	BLKIO_PROP_group_wait_time,
	93	BLKIO_PROP_idle_time,
	94	BLKIO_PROP_empty_time,
	95	BLKIO_PROP_dequeue,
	96	};
	97
4c9eefa1 VG	98	/* cgroup files owned by throttle policy */
	99	enum blkcg_file_name_throtl {
	100	BLKIO_THROTL_read_bps_device,
	101	BLKIO_THROTL_write_bps_device,
7702e8f4 VG	102	BLKIO_THROTL_read_iops_device,
7702e8f4 VG	103	BLKIO_THROTL_write_iops_device,
4c9eefa1 VG	104	BLKIO_THROTL_io_service_bytes,
	105	BLKIO_THROTL_io_serviced,
	106	};
	107
31e4c28d VG	108	struct blkio_cgroup {
	109	struct cgroup_subsys_state css;
	110	unsigned int weight;
	111	spinlock_t lock;
	112	struct hlist_head blkg_list;
34d0f179	113	struct list_head policy_list; /* list of blkio_policy_node */
31e4c28d VG	114	};
31e4c28d VG	115
303a3acb DS	116	struct blkio_group_stats {
	117	/* total disk time and nr sectors dispatched by this group */
	118	uint64_t time;
	119	uint64_t sectors;
167400d3 JT	120	/* Time not charged to this cgroup */
167400d3 JT	121	uint64_t unaccounted_time;
cdc1184c	122	uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
303a3acb	123	#ifdef CONFIG_DEBUG_BLK_CGROUP
cdc1184c DS	124	/* Sum of number of IOs queued across all samples */
	125	uint64_t avg_queue_size_sum;
	126	/* Count of samples taken for average */
	127	uint64_t avg_queue_size_samples;
303a3acb DS	128	/* How many times this group has been removed from service tree */
303a3acb DS	129	unsigned long dequeue;
812df48d DS	130
	131	/* Total time spent waiting for it to be assigned a timeslice. */
	132	uint64_t group_wait_time;
	133	uint64_t start_group_wait_time;
	134
	135	/* Time spent idling for this blkio_group */
	136	uint64_t idle_time;
	137	uint64_t start_idle_time;
	138	/*
	139	* Total time when we have requests queued and do not contain the
	140	* current active queue.
	141	*/
	142	uint64_t empty_time;
	143	uint64_t start_empty_time;
	144	uint16_t flags;
303a3acb DS	145	#endif
	146	};
	147
31e4c28d VG	148	struct blkio_group {
	149	/* An rcu protected unique identifier for the group */
	150	void *key;
	151	struct hlist_node blkcg_node;
b1c35769	152	unsigned short blkcg_id;
2868ef7b VG	153	/* Store cgroup path */
2868ef7b VG	154	char path[128];
22084190	155	/* The device MKDEV(major, minor), this group has been created for */
84c124da	156	dev_t dev;
062a644d VG	157	/* policy which owns this blk group */
062a644d VG	158	enum blkio_policy_id plid;
22084190	159
303a3acb DS	160	/* Need to serialize the stats in the case of reset/update */
	161	spinlock_t stats_lock;
	162	struct blkio_group_stats stats;
31e4c28d VG	163	};
31e4c28d VG	164
34d0f179 GJ	165	struct blkio_policy_node {
	166	struct list_head node;
	167	dev_t dev;
062a644d VG	168	/* This node belongs to max bw policy or porportional weight policy */
	169	enum blkio_policy_id plid;
	170	/* cgroup file to which this rule belongs to */
	171	int fileid;
4c9eefa1 VG	172
	173	union {
	174	unsigned int weight;
	175	/*
	176	* Rate read/write in terms of byptes per second
	177	* Whether this rate represents read or write is determined
	178	* by file type "fileid".
	179	*/
	180	u64 bps;
7702e8f4	181	unsigned int iops;
4c9eefa1	182	} val;
34d0f179 GJ	183	};
	184
	185	extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
	186	dev_t dev);
4c9eefa1 VG	187	extern uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg,
	188	dev_t dev);
	189	extern uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg,
	190	dev_t dev);
7702e8f4 VG	191	extern unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg,
	192	dev_t dev);
	193	extern unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg,
	194	dev_t dev);
34d0f179	195
3e252066	196	typedef void (blkio_unlink_group_fn) (void key, struct blkio_group blkg);
fe071437 VG	197
	198	typedef void (blkio_update_group_weight_fn) (void *key,
	199	struct blkio_group *blkg, unsigned int weight);
	200	typedef void (blkio_update_group_read_bps_fn) (void * key,
	201	struct blkio_group *blkg, u64 read_bps);
	202	typedef void (blkio_update_group_write_bps_fn) (void *key,
	203	struct blkio_group *blkg, u64 write_bps);
	204	typedef void (blkio_update_group_read_iops_fn) (void *key,
	205	struct blkio_group *blkg, unsigned int read_iops);
	206	typedef void (blkio_update_group_write_iops_fn) (void *key,
	207	struct blkio_group *blkg, unsigned int write_iops);
3e252066 VG	208
	209	struct blkio_policy_ops {
	210	blkio_unlink_group_fn *blkio_unlink_group_fn;
	211	blkio_update_group_weight_fn *blkio_update_group_weight_fn;
4c9eefa1 VG	212	blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn;
4c9eefa1 VG	213	blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn;
7702e8f4 VG	214	blkio_update_group_read_iops_fn *blkio_update_group_read_iops_fn;
7702e8f4 VG	215	blkio_update_group_write_iops_fn *blkio_update_group_write_iops_fn;
3e252066 VG	216	};
	217
	218	struct blkio_policy_type {
	219	struct list_head list;
	220	struct blkio_policy_ops ops;
062a644d	221	enum blkio_policy_id plid;
3e252066 VG	222	};
	223
	224	/* Blkio controller policy registration */
	225	extern void blkio_policy_register(struct blkio_policy_type *);
	226	extern void blkio_policy_unregister(struct blkio_policy_type *);
	227
afc24d49 VG	228	static inline char blkg_path(struct blkio_group blkg)
	229	{
	230	return blkg->path;
	231	}
	232
2f5ea477 JA	233	#else
	234
	235	struct blkio_group {
	236	};
	237
3e252066 VG	238	struct blkio_policy_type {
	239	};
	240
	241	static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
	242	static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
	243
afc24d49 VG	244	static inline char blkg_path(struct blkio_group blkg) { return NULL; }
afc24d49 VG	245
2f5ea477 JA	246	#endif
2f5ea477 JA	247
df457f84	248	#define BLKIO_WEIGHT_MIN 10
31e4c28d VG	249	#define BLKIO_WEIGHT_MAX 1000
	250	#define BLKIO_WEIGHT_DEFAULT 500
	251
2868ef7b	252	#ifdef CONFIG_DEBUG_BLK_CGROUP
a11cdaa7	253	void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
9195291e	254	void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
22084190	255	unsigned long dequeue);
812df48d DS	256	void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
812df48d DS	257	void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
e5ff082e	258	void blkiocg_set_start_empty_time(struct blkio_group *blkg);
812df48d DS	259
	260	#define BLKG_FLAG_FNS(name) \
	261	static inline void blkio_mark_blkg_##name( \
	262	struct blkio_group_stats *stats) \
	263	{ \
	264	stats->flags \|= (1 << BLKG_##name); \
	265	} \
	266	static inline void blkio_clear_blkg_##name( \
	267	struct blkio_group_stats *stats) \
	268	{ \
	269	stats->flags &= ~(1 << BLKG_##name); \
	270	} \
	271	static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \
	272	{ \
	273	return (stats->flags & (1 << BLKG_##name)) != 0; \
	274	} \
	275
	276	BLKG_FLAG_FNS(waiting)
	277	BLKG_FLAG_FNS(idling)
	278	BLKG_FLAG_FNS(empty)
	279	#undef BLKG_FLAG_FNS
2868ef7b	280	#else
a11cdaa7	281	static inline void blkiocg_update_avg_queue_size_stats(
cdc1184c	282	struct blkio_group *blkg) {}
9195291e DS	283	static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
9195291e DS	284	unsigned long dequeue) {}
812df48d DS	285	static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
	286	{}
	287	static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
e5ff082e	288	static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
2868ef7b VG	289	#endif
2868ef7b VG	290
67523c48	291	#if defined(CONFIG_BLK_CGROUP) \|\| defined(CONFIG_BLK_CGROUP_MODULE)
31e4c28d VG	292	extern struct blkio_cgroup blkio_root_cgroup;
31e4c28d VG	293	extern struct blkio_cgroup cgroup_to_blkio_cgroup(struct cgroup cgroup);
70087dc3	294	extern struct blkio_cgroup task_blkio_cgroup(struct task_struct tsk);
31e4c28d	295	extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
062a644d VG	296	struct blkio_group blkg, void key, dev_t dev,
062a644d VG	297	enum blkio_policy_id plid);
31e4c28d VG	298	extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
	299	extern struct blkio_group blkiocg_lookup_group(struct blkio_cgroup blkcg,
	300	void *key);
303a3acb	301	void blkiocg_update_timeslice_used(struct blkio_group *blkg,
167400d3 JT	302	unsigned long time,
167400d3 JT	303	unsigned long unaccounted_time);
84c124da DS	304	void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
	305	bool direction, bool sync);
	306	void blkiocg_update_completion_stats(struct blkio_group *blkg,
	307	uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
812d4026 DS	308	void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
812d4026 DS	309	bool sync);
a11cdaa7	310	void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	311	struct blkio_group *curr_blkg, bool direction, bool sync);
a11cdaa7	312	void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	313	bool direction, bool sync);
31e4c28d	314	#else
2f5ea477	315	struct cgroup;
31e4c28d VG	316	static inline struct blkio_cgroup *
31e4c28d VG	317	cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
70087dc3 VG	318	static inline struct blkio_cgroup *
70087dc3 VG	319	task_blkio_cgroup(struct task_struct *tsk) { return NULL; }
31e4c28d VG	320
31e4c28d VG	321	static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
062a644d VG	322	struct blkio_group blkg, void key, dev_t dev,
062a644d VG	323	enum blkio_policy_id plid) {}
31e4c28d VG	324
	325	static inline int
	326	blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
	327
	328	static inline struct blkio_group *
	329	blkiocg_lookup_group(struct blkio_cgroup blkcg, void key) { return NULL; }
303a3acb	330	static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
167400d3 JT	331	unsigned long time,
	332	unsigned long unaccounted_time)
	333	{}
84c124da DS	334	static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
	335	uint64_t bytes, bool direction, bool sync) {}
	336	static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
	337	uint64_t start_time, uint64_t io_start_time, bool direction,
	338	bool sync) {}
812d4026 DS	339	static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
812d4026 DS	340	bool direction, bool sync) {}
a11cdaa7	341	static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	342	struct blkio_group *curr_blkg, bool direction, bool sync) {}
a11cdaa7	343	static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	344	bool direction, bool sync) {}
31e4c28d VG	345	#endif
31e4c28d VG	346	#endif /* _BLK_CGROUP_H */