[mirror_ubuntu-artful-kernel.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>
#include <linux/u64_stats_sync.h>

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

	BLKIO_NR_POLICIES,
};

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

#ifdef CONFIG_BLK_CGROUP

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 time spent waiting in scheduler queue in ns */
	BLKIO_STAT_WAIT_TIME,
	/* Number of IOs queued up */
	BLKIO_STAT_QUEUED,
	/* All the single valued stats go below this */
	BLKIO_STAT_TIME,
#ifdef CONFIG_DEBUG_BLK_CGROUP
	/* Time not charged to this cgroup */
	BLKIO_STAT_UNACCOUNTED_TIME,
	BLKIO_STAT_AVG_QUEUE_SIZE,
	BLKIO_STAT_IDLE_TIME,
	BLKIO_STAT_EMPTY_TIME,
	BLKIO_STAT_GROUP_WAIT_TIME,
	BLKIO_STAT_DEQUEUE
#endif
};

/* Per cpu stats */
enum stat_type_cpu {
	BLKIO_STAT_CPU_SECTORS,
	/* Total bytes transferred */
	BLKIO_STAT_CPU_SERVICE_BYTES,
	/* Total IOs serviced, post merge */
	BLKIO_STAT_CPU_SERVICED,
	/* Number of IOs merged */
	BLKIO_STAT_CPU_MERGED,
	BLKIO_STAT_CPU_NR
};

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 blkio_group_stats {
	/* total disk time and nr sectors dispatched by this group */
	uint64_t time;
	uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
#ifdef CONFIG_DEBUG_BLK_CGROUP
	/* Time not charged to this cgroup */
	uint64_t unaccounted_time;

	/* 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
};

/* Per cpu blkio group stats */
struct blkio_group_stats_cpu {
	uint64_t sectors;
	uint64_t stat_arr_cpu[BLKIO_STAT_CPU_NR][BLKIO_STAT_TOTAL];
	struct u64_stats_sync syncp;
};

struct blkio_group_conf {
	unsigned int weight;
	unsigned int iops[2];
	u64 bps[2];
};

/* per-blkg per-policy data */
struct blkg_policy_data {
	/* the blkg this per-policy data belongs to */
	struct blkio_group *blkg;

	/* pol->pdata_size bytes of private data used by policy impl */
	char pdata[] __aligned(__alignof__(unsigned long long));
};

struct blkio_group {
	/* Pointer to the associated request_queue, RCU protected */
	struct request_queue __rcu *q;
	struct hlist_node blkcg_node;
	struct blkio_cgroup *blkcg;
	/* Store cgroup path */
	char path[128];
	/* policy which owns this blk group */
	enum blkio_policy_id plid;

	/* Configuration */
	struct blkio_group_conf conf;

	/* Need to serialize the stats in the case of reset/update */
	spinlock_t stats_lock;
	struct blkio_group_stats stats;
	/* Per cpu stats pointer */
	struct blkio_group_stats_cpu __percpu *stats_cpu;

	struct blkg_policy_data *pd;
};

typedef void (blkio_init_group_fn)(struct blkio_group *blkg);
typedef void (blkio_link_group_fn)(struct request_queue *q,
			struct blkio_group *blkg);
typedef void (blkio_unlink_group_fn)(struct request_queue *q,
			struct blkio_group *blkg);
typedef bool (blkio_clear_queue_fn)(struct request_queue *q);
typedef void (blkio_update_group_weight_fn)(struct request_queue *q,
			struct blkio_group *blkg, unsigned int weight);
typedef void (blkio_update_group_read_bps_fn)(struct request_queue *q,
			struct blkio_group *blkg, u64 read_bps);
typedef void (blkio_update_group_write_bps_fn)(struct request_queue *q,
			struct blkio_group *blkg, u64 write_bps);
typedef void (blkio_update_group_read_iops_fn)(struct request_queue *q,
			struct blkio_group *blkg, unsigned int read_iops);
typedef void (blkio_update_group_write_iops_fn)(struct request_queue *q,
			struct blkio_group *blkg, unsigned int write_iops);

struct blkio_policy_ops {
	blkio_init_group_fn *blkio_init_group_fn;
	blkio_link_group_fn *blkio_link_group_fn;
	blkio_unlink_group_fn *blkio_unlink_group_fn;
	blkio_clear_queue_fn *blkio_clear_queue_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;
	size_t pdata_size;		/* policy specific private data size */
};

extern int blkcg_init_queue(struct request_queue *q);
extern void blkcg_drain_queue(struct request_queue *q);
extern void blkcg_exit_queue(struct request_queue *q);

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

/**
 * blkg_to_pdata - get policy private data
 * @blkg: blkg of interest
 * @pol: policy of interest
 *
 * Return pointer to private data associated with the @blkg-@pol pair.
 */
static inline void *blkg_to_pdata(struct blkio_group *blkg,
			      struct blkio_policy_type *pol)
{
	return blkg ? blkg->pd->pdata : NULL;
}

/**
 * pdata_to_blkg - get blkg associated with policy private data
 * @pdata: policy private data of interest
 * @pol: policy @pdata is for
 *
 * @pdata is policy private data for @pol.  Determine the blkg it's
 * associated with.
 */
static inline struct blkio_group *pdata_to_blkg(void *pdata,
						struct blkio_policy_type *pol)
{
	if (pdata) {
		struct blkg_policy_data *pd =
			container_of(pdata, struct blkg_policy_data, pdata);
		return pd->blkg;
	}
	return NULL;
}

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

#else

struct blkio_group {
};

struct blkio_policy_type {
};

static inline int blkcg_init_queue(struct request_queue *q) { return 0; }
static inline void blkcg_drain_queue(struct request_queue *q) { }
static inline void blkcg_exit_queue(struct request_queue *q) { }
static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
static inline void blkg_destroy_all(struct request_queue *q) { }

static inline void *blkg_to_pdata(struct blkio_group *blkg,
				struct blkio_policy_type *pol) { return NULL; }
static inline struct blkio_group *pdata_to_blkg(void *pdata,
				struct blkio_policy_type *pol) { return NULL; }
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

#ifdef CONFIG_BLK_CGROUP
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 int blkiocg_del_blkio_group(struct blkio_group *blkg);
extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
				       struct request_queue *q,
				       enum blkio_policy_id plid);
struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
				       struct request_queue *q,
				       enum blkio_policy_id plid,
				       bool for_root);
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 int
blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }

static inline struct blkio_group *blkg_lookup(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>
575969a0	17	#include <linux/u64_stats_sync.h>
31e4c28d	18
062a644d VG	19	enum blkio_policy_id {
062a644d VG	20	BLKIO_POLICY_PROP = 0, /* Proportional Bandwidth division */
4c9eefa1	21	BLKIO_POLICY_THROTL, /* Throttling */
035d10b2 TH	22
035d10b2 TH	23	BLKIO_NR_POLICIES,
062a644d VG	24	};
062a644d VG	25
9355aede VG	26	/* Max limits for throttle policy */
	27	#define THROTL_IOPS_MAX UINT_MAX
	28
32e380ae	29	#ifdef CONFIG_BLK_CGROUP
2f5ea477	30
84c124da DS	31	enum stat_type {
	32	/* Total time spent (in ns) between request dispatch to the driver and
	33	* request completion for IOs doen by this cgroup. This may not be
	34	* accurate when NCQ is turned on. */
	35	BLKIO_STAT_SERVICE_TIME = 0,
84c124da DS	36	/* Total time spent waiting in scheduler queue in ns */
84c124da DS	37	BLKIO_STAT_WAIT_TIME,
cdc1184c DS	38	/* Number of IOs queued up */
cdc1184c DS	39	BLKIO_STAT_QUEUED,
84c124da DS	40	/* All the single valued stats go below this */
84c124da DS	41	BLKIO_STAT_TIME,
a23e6869	42	#ifdef CONFIG_DEBUG_BLK_CGROUP
167400d3 JT	43	/* Time not charged to this cgroup */
167400d3 JT	44	BLKIO_STAT_UNACCOUNTED_TIME,
cdc1184c	45	BLKIO_STAT_AVG_QUEUE_SIZE,
812df48d DS	46	BLKIO_STAT_IDLE_TIME,
	47	BLKIO_STAT_EMPTY_TIME,
	48	BLKIO_STAT_GROUP_WAIT_TIME,
84c124da DS	49	BLKIO_STAT_DEQUEUE
	50	#endif
	51	};
	52
5624a4e4 VG	53	/* Per cpu stats */
	54	enum stat_type_cpu {
	55	BLKIO_STAT_CPU_SECTORS,
	56	/* Total bytes transferred */
	57	BLKIO_STAT_CPU_SERVICE_BYTES,
	58	/* Total IOs serviced, post merge */
	59	BLKIO_STAT_CPU_SERVICED,
317389a7 VG	60	/* Number of IOs merged */
317389a7 VG	61	BLKIO_STAT_CPU_MERGED,
5624a4e4 VG	62	BLKIO_STAT_CPU_NR
	63	};
	64
84c124da DS	65	enum stat_sub_type {
	66	BLKIO_STAT_READ = 0,
	67	BLKIO_STAT_WRITE,
	68	BLKIO_STAT_SYNC,
	69	BLKIO_STAT_ASYNC,
	70	BLKIO_STAT_TOTAL
303a3acb DS	71	};
303a3acb DS	72
812df48d DS	73	/* blkg state flags */
	74	enum blkg_state_flags {
	75	BLKG_waiting = 0,
	76	BLKG_idling,
	77	BLKG_empty,
	78	};
	79
062a644d VG	80	/* cgroup files owned by proportional weight policy */
	81	enum blkcg_file_name_prop {
	82	BLKIO_PROP_weight = 1,
	83	BLKIO_PROP_weight_device,
	84	BLKIO_PROP_io_service_bytes,
	85	BLKIO_PROP_io_serviced,
	86	BLKIO_PROP_time,
	87	BLKIO_PROP_sectors,
167400d3	88	BLKIO_PROP_unaccounted_time,
062a644d VG	89	BLKIO_PROP_io_service_time,
	90	BLKIO_PROP_io_wait_time,
	91	BLKIO_PROP_io_merged,
	92	BLKIO_PROP_io_queued,
	93	BLKIO_PROP_avg_queue_size,
	94	BLKIO_PROP_group_wait_time,
	95	BLKIO_PROP_idle_time,
	96	BLKIO_PROP_empty_time,
	97	BLKIO_PROP_dequeue,
	98	};
	99
4c9eefa1 VG	100	/* cgroup files owned by throttle policy */
	101	enum blkcg_file_name_throtl {
	102	BLKIO_THROTL_read_bps_device,
	103	BLKIO_THROTL_write_bps_device,
7702e8f4 VG	104	BLKIO_THROTL_read_iops_device,
7702e8f4 VG	105	BLKIO_THROTL_write_iops_device,
4c9eefa1 VG	106	BLKIO_THROTL_io_service_bytes,
	107	BLKIO_THROTL_io_serviced,
	108	};
	109
31e4c28d VG	110	struct blkio_cgroup {
	111	struct cgroup_subsys_state css;
	112	unsigned int weight;
	113	spinlock_t lock;
	114	struct hlist_head blkg_list;
	115	};
	116
303a3acb DS	117	struct blkio_group_stats {
	118	/* total disk time and nr sectors dispatched by this group */
	119	uint64_t time;
cdc1184c	120	uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
303a3acb	121	#ifdef CONFIG_DEBUG_BLK_CGROUP
a23e6869 VG	122	/* Time not charged to this cgroup */
	123	uint64_t unaccounted_time;
	124
cdc1184c DS	125	/* Sum of number of IOs queued across all samples */
	126	uint64_t avg_queue_size_sum;
	127	/* Count of samples taken for average */
	128	uint64_t avg_queue_size_samples;
303a3acb DS	129	/* How many times this group has been removed from service tree */
303a3acb DS	130	unsigned long dequeue;
812df48d DS	131
	132	/* Total time spent waiting for it to be assigned a timeslice. */
	133	uint64_t group_wait_time;
	134	uint64_t start_group_wait_time;
	135
	136	/* Time spent idling for this blkio_group */
	137	uint64_t idle_time;
	138	uint64_t start_idle_time;
	139	/*
	140	* Total time when we have requests queued and do not contain the
	141	* current active queue.
	142	*/
	143	uint64_t empty_time;
	144	uint64_t start_empty_time;
	145	uint16_t flags;
303a3acb DS	146	#endif
	147	};
	148
5624a4e4 VG	149	/* Per cpu blkio group stats */
	150	struct blkio_group_stats_cpu {
	151	uint64_t sectors;
	152	uint64_t stat_arr_cpu[BLKIO_STAT_CPU_NR][BLKIO_STAT_TOTAL];
575969a0	153	struct u64_stats_sync syncp;
5624a4e4 VG	154	};
5624a4e4 VG	155
e56da7e2 TH	156	struct blkio_group_conf {
	157	unsigned int weight;
	158	unsigned int iops[2];
	159	u64 bps[2];
	160	};
	161
0381411e TH	162	/* per-blkg per-policy data */
	163	struct blkg_policy_data {
	164	/* the blkg this per-policy data belongs to */
	165	struct blkio_group *blkg;
	166
	167	/* pol->pdata_size bytes of private data used by policy impl */
	168	char pdata[] __aligned(__alignof__(unsigned long long));
	169	};
	170
31e4c28d	171	struct blkio_group {
ca32aefc TH	172	/* Pointer to the associated request_queue, RCU protected */
ca32aefc TH	173	struct request_queue __rcu *q;
31e4c28d	174	struct hlist_node blkcg_node;
7ee9c562	175	struct blkio_cgroup *blkcg;
2868ef7b VG	176	/* Store cgroup path */
2868ef7b VG	177	char path[128];
062a644d VG	178	/* policy which owns this blk group */
062a644d VG	179	enum blkio_policy_id plid;
22084190	180
e56da7e2 TH	181	/* Configuration */
	182	struct blkio_group_conf conf;
	183
303a3acb DS	184	/* Need to serialize the stats in the case of reset/update */
	185	spinlock_t stats_lock;
	186	struct blkio_group_stats stats;
5624a4e4 VG	187	/* Per cpu stats pointer */
5624a4e4 VG	188	struct blkio_group_stats_cpu __percpu *stats_cpu;
0381411e TH	189
0381411e TH	190	struct blkg_policy_data *pd;
31e4c28d VG	191	};
31e4c28d VG	192
0381411e	193	typedef void (blkio_init_group_fn)(struct blkio_group *blkg);
cd1604fa TH	194	typedef void (blkio_link_group_fn)(struct request_queue *q,
cd1604fa TH	195	struct blkio_group *blkg);
ca32aefc TH	196	typedef void (blkio_unlink_group_fn)(struct request_queue *q,
ca32aefc TH	197	struct blkio_group *blkg);
72e06c25	198	typedef bool (blkio_clear_queue_fn)(struct request_queue *q);
ca32aefc	199	typedef void (blkio_update_group_weight_fn)(struct request_queue *q,
fe071437	200	struct blkio_group *blkg, unsigned int weight);
ca32aefc	201	typedef void (blkio_update_group_read_bps_fn)(struct request_queue *q,
fe071437	202	struct blkio_group *blkg, u64 read_bps);
ca32aefc	203	typedef void (blkio_update_group_write_bps_fn)(struct request_queue *q,
fe071437	204	struct blkio_group *blkg, u64 write_bps);
ca32aefc	205	typedef void (blkio_update_group_read_iops_fn)(struct request_queue *q,
fe071437	206	struct blkio_group *blkg, unsigned int read_iops);
ca32aefc	207	typedef void (blkio_update_group_write_iops_fn)(struct request_queue *q,
fe071437	208	struct blkio_group *blkg, unsigned int write_iops);
3e252066 VG	209
3e252066 VG	210	struct blkio_policy_ops {
0381411e	211	blkio_init_group_fn *blkio_init_group_fn;
cd1604fa	212	blkio_link_group_fn *blkio_link_group_fn;
3e252066	213	blkio_unlink_group_fn *blkio_unlink_group_fn;
72e06c25	214	blkio_clear_queue_fn *blkio_clear_queue_fn;
3e252066	215	blkio_update_group_weight_fn *blkio_update_group_weight_fn;
4c9eefa1 VG	216	blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn;
4c9eefa1 VG	217	blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn;
7702e8f4 VG	218	blkio_update_group_read_iops_fn *blkio_update_group_read_iops_fn;
7702e8f4 VG	219	blkio_update_group_write_iops_fn *blkio_update_group_write_iops_fn;
3e252066 VG	220	};
	221
	222	struct blkio_policy_type {
	223	struct list_head list;
	224	struct blkio_policy_ops ops;
062a644d	225	enum blkio_policy_id plid;
0381411e	226	size_t pdata_size; /* policy specific private data size */
3e252066 VG	227	};
3e252066 VG	228
5efd6113 TH	229	extern int blkcg_init_queue(struct request_queue *q);
	230	extern void blkcg_drain_queue(struct request_queue *q);
	231	extern void blkcg_exit_queue(struct request_queue *q);
	232
3e252066 VG	233	/* Blkio controller policy registration */
	234	extern void blkio_policy_register(struct blkio_policy_type *);
	235	extern void blkio_policy_unregister(struct blkio_policy_type *);
72e06c25	236	extern void blkg_destroy_all(struct request_queue *q);
3e252066	237
0381411e TH	238	/**
	239	* blkg_to_pdata - get policy private data
	240	* @blkg: blkg of interest
	241	* @pol: policy of interest
	242	*
	243	* Return pointer to private data associated with the @blkg-@pol pair.
	244	*/
	245	static inline void blkg_to_pdata(struct blkio_group blkg,
	246	struct blkio_policy_type *pol)
	247	{
	248	return blkg ? blkg->pd->pdata : NULL;
	249	}
	250
	251	/**
	252	* pdata_to_blkg - get blkg associated with policy private data
	253	* @pdata: policy private data of interest
	254	* @pol: policy @pdata is for
	255	*
	256	* @pdata is policy private data for @pol. Determine the blkg it's
	257	* associated with.
	258	*/
	259	static inline struct blkio_group pdata_to_blkg(void pdata,
	260	struct blkio_policy_type *pol)
	261	{
	262	if (pdata) {
	263	struct blkg_policy_data *pd =
	264	container_of(pdata, struct blkg_policy_data, pdata);
	265	return pd->blkg;
	266	}
	267	return NULL;
	268	}
	269
afc24d49 VG	270	static inline char blkg_path(struct blkio_group blkg)
	271	{
	272	return blkg->path;
	273	}
	274
2f5ea477 JA	275	#else
	276
	277	struct blkio_group {
	278	};
	279
3e252066 VG	280	struct blkio_policy_type {
	281	};
	282
5efd6113 TH	283	static inline int blkcg_init_queue(struct request_queue *q) { return 0; }
	284	static inline void blkcg_drain_queue(struct request_queue *q) { }
	285	static inline void blkcg_exit_queue(struct request_queue *q) { }
3e252066 VG	286	static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
3e252066 VG	287	static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
72e06c25	288	static inline void blkg_destroy_all(struct request_queue *q) { }
3e252066	289
0381411e TH	290	static inline void blkg_to_pdata(struct blkio_group blkg,
	291	struct blkio_policy_type *pol) { return NULL; }
	292	static inline struct blkio_group pdata_to_blkg(void pdata,
	293	struct blkio_policy_type *pol) { return NULL; }
afc24d49 VG	294	static inline char blkg_path(struct blkio_group blkg) { return NULL; }
afc24d49 VG	295
2f5ea477 JA	296	#endif
2f5ea477 JA	297
df457f84	298	#define BLKIO_WEIGHT_MIN 10
31e4c28d VG	299	#define BLKIO_WEIGHT_MAX 1000
	300	#define BLKIO_WEIGHT_DEFAULT 500
	301
2868ef7b	302	#ifdef CONFIG_DEBUG_BLK_CGROUP
a11cdaa7	303	void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
9195291e	304	void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
22084190	305	unsigned long dequeue);
812df48d DS	306	void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
812df48d DS	307	void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
e5ff082e	308	void blkiocg_set_start_empty_time(struct blkio_group *blkg);
812df48d DS	309
	310	#define BLKG_FLAG_FNS(name) \
	311	static inline void blkio_mark_blkg_##name( \
	312	struct blkio_group_stats *stats) \
	313	{ \
	314	stats->flags \|= (1 << BLKG_##name); \
	315	} \
	316	static inline void blkio_clear_blkg_##name( \
	317	struct blkio_group_stats *stats) \
	318	{ \
	319	stats->flags &= ~(1 << BLKG_##name); \
	320	} \
	321	static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \
	322	{ \
	323	return (stats->flags & (1 << BLKG_##name)) != 0; \
	324	} \
	325
	326	BLKG_FLAG_FNS(waiting)
	327	BLKG_FLAG_FNS(idling)
	328	BLKG_FLAG_FNS(empty)
	329	#undef BLKG_FLAG_FNS
2868ef7b	330	#else
a11cdaa7	331	static inline void blkiocg_update_avg_queue_size_stats(
cdc1184c	332	struct blkio_group *blkg) {}
9195291e DS	333	static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
9195291e DS	334	unsigned long dequeue) {}
812df48d DS	335	static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
	336	{}
	337	static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
e5ff082e	338	static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
2868ef7b VG	339	#endif
2868ef7b VG	340
32e380ae	341	#ifdef CONFIG_BLK_CGROUP
31e4c28d VG	342	extern struct blkio_cgroup blkio_root_cgroup;
31e4c28d VG	343	extern struct blkio_cgroup cgroup_to_blkio_cgroup(struct cgroup cgroup);
70087dc3	344	extern struct blkio_cgroup task_blkio_cgroup(struct task_struct tsk);
31e4c28d	345	extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
cd1604fa TH	346	extern struct blkio_group blkg_lookup(struct blkio_cgroup blkcg,
	347	struct request_queue *q,
	348	enum blkio_policy_id plid);
	349	struct blkio_group blkg_lookup_create(struct blkio_cgroup blkcg,
	350	struct request_queue *q,
	351	enum blkio_policy_id plid,
	352	bool for_root);
303a3acb	353	void blkiocg_update_timeslice_used(struct blkio_group *blkg,
167400d3 JT	354	unsigned long time,
167400d3 JT	355	unsigned long unaccounted_time);
84c124da DS	356	void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
	357	bool direction, bool sync);
	358	void blkiocg_update_completion_stats(struct blkio_group *blkg,
	359	uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
812d4026 DS	360	void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
812d4026 DS	361	bool sync);
a11cdaa7	362	void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	363	struct blkio_group *curr_blkg, bool direction, bool sync);
a11cdaa7	364	void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	365	bool direction, bool sync);
31e4c28d	366	#else
2f5ea477	367	struct cgroup;
31e4c28d VG	368	static inline struct blkio_cgroup *
31e4c28d VG	369	cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
70087dc3 VG	370	static inline struct blkio_cgroup *
70087dc3 VG	371	task_blkio_cgroup(struct task_struct *tsk) { return NULL; }
31e4c28d	372
31e4c28d VG	373	static inline int
	374	blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
	375
cd1604fa TH	376	static inline struct blkio_group blkg_lookup(struct blkio_cgroup blkcg,
cd1604fa TH	377	void *key) { return NULL; }
303a3acb	378	static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
167400d3 JT	379	unsigned long time,
	380	unsigned long unaccounted_time)
	381	{}
84c124da DS	382	static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
	383	uint64_t bytes, bool direction, bool sync) {}
	384	static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
	385	uint64_t start_time, uint64_t io_start_time, bool direction,
	386	bool sync) {}
812d4026 DS	387	static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
812d4026 DS	388	bool direction, bool sync) {}
a11cdaa7	389	static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	390	struct blkio_group *curr_blkg, bool direction, bool sync) {}
a11cdaa7	391	static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	392	bool direction, bool sync) {}
31e4c28d VG	393	#endif
31e4c28d VG	394	#endif /* _BLK_CGROUP_H */