[deliverable/linux.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 */
};

/* 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 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 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 {
	/* Pointer to the associated request_queue, RCU protected */
	struct request_queue __rcu *q;
	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;
	/* Per cpu stats pointer */
	struct blkio_group_stats_cpu __percpu *stats_cpu;
};

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 bytes 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)(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_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;
};

/* 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);

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 void blkg_destroy_all(struct request_queue *q) { }

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 void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
	struct blkio_group *blkg, struct request_queue *q, dev_t dev,
	enum blkio_policy_id plid);
extern int blkio_alloc_blkg_stats(struct blkio_group *blkg);
extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg,
						struct request_queue *q,
						enum blkio_policy_id plid);
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 blkio_alloc_blkg_stats(struct blkio_group *blkg) { return 0; }

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>
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 */
062a644d VG	22	};
062a644d VG	23
9355aede VG	24	/* Max limits for throttle policy */
	25	#define THROTL_IOPS_MAX UINT_MAX
	26
32e380ae	27	#ifdef CONFIG_BLK_CGROUP
2f5ea477	28
84c124da DS	29	enum stat_type {
	30	/* Total time spent (in ns) between request dispatch to the driver and
	31	* request completion for IOs doen by this cgroup. This may not be
	32	* accurate when NCQ is turned on. */
	33	BLKIO_STAT_SERVICE_TIME = 0,
84c124da DS	34	/* Total time spent waiting in scheduler queue in ns */
84c124da DS	35	BLKIO_STAT_WAIT_TIME,
cdc1184c DS	36	/* Number of IOs queued up */
cdc1184c DS	37	BLKIO_STAT_QUEUED,
84c124da DS	38	/* All the single valued stats go below this */
84c124da DS	39	BLKIO_STAT_TIME,
a23e6869	40	#ifdef CONFIG_DEBUG_BLK_CGROUP
167400d3 JT	41	/* Time not charged to this cgroup */
167400d3 JT	42	BLKIO_STAT_UNACCOUNTED_TIME,
cdc1184c	43	BLKIO_STAT_AVG_QUEUE_SIZE,
812df48d DS	44	BLKIO_STAT_IDLE_TIME,
	45	BLKIO_STAT_EMPTY_TIME,
	46	BLKIO_STAT_GROUP_WAIT_TIME,
84c124da DS	47	BLKIO_STAT_DEQUEUE
	48	#endif
	49	};
	50
5624a4e4 VG	51	/* Per cpu stats */
	52	enum stat_type_cpu {
	53	BLKIO_STAT_CPU_SECTORS,
	54	/* Total bytes transferred */
	55	BLKIO_STAT_CPU_SERVICE_BYTES,
	56	/* Total IOs serviced, post merge */
	57	BLKIO_STAT_CPU_SERVICED,
317389a7 VG	58	/* Number of IOs merged */
317389a7 VG	59	BLKIO_STAT_CPU_MERGED,
5624a4e4 VG	60	BLKIO_STAT_CPU_NR
	61	};
	62
84c124da DS	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;
cdc1184c	119	uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
303a3acb	120	#ifdef CONFIG_DEBUG_BLK_CGROUP
a23e6869 VG	121	/* Time not charged to this cgroup */
	122	uint64_t unaccounted_time;
	123
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
5624a4e4 VG	148	/* Per cpu blkio group stats */
	149	struct blkio_group_stats_cpu {
	150	uint64_t sectors;
	151	uint64_t stat_arr_cpu[BLKIO_STAT_CPU_NR][BLKIO_STAT_TOTAL];
575969a0	152	struct u64_stats_sync syncp;
5624a4e4 VG	153	};
5624a4e4 VG	154
31e4c28d	155	struct blkio_group {
ca32aefc TH	156	/* Pointer to the associated request_queue, RCU protected */
ca32aefc TH	157	struct request_queue __rcu *q;
31e4c28d	158	struct hlist_node blkcg_node;
b1c35769	159	unsigned short blkcg_id;
2868ef7b VG	160	/* Store cgroup path */
2868ef7b VG	161	char path[128];
22084190	162	/* The device MKDEV(major, minor), this group has been created for */
84c124da	163	dev_t dev;
062a644d VG	164	/* policy which owns this blk group */
062a644d VG	165	enum blkio_policy_id plid;
22084190	166
303a3acb DS	167	/* Need to serialize the stats in the case of reset/update */
	168	spinlock_t stats_lock;
	169	struct blkio_group_stats stats;
5624a4e4 VG	170	/* Per cpu stats pointer */
5624a4e4 VG	171	struct blkio_group_stats_cpu __percpu *stats_cpu;
31e4c28d VG	172	};
31e4c28d VG	173
34d0f179 GJ	174	struct blkio_policy_node {
	175	struct list_head node;
	176	dev_t dev;
062a644d VG	177	/* This node belongs to max bw policy or porportional weight policy */
	178	enum blkio_policy_id plid;
	179	/* cgroup file to which this rule belongs to */
	180	int fileid;
4c9eefa1 VG	181
	182	union {
	183	unsigned int weight;
	184	/*
e890413a	185	* Rate read/write in terms of bytes per second
4c9eefa1 VG	186	* Whether this rate represents read or write is determined
	187	* by file type "fileid".
	188	*/
	189	u64 bps;
7702e8f4	190	unsigned int iops;
4c9eefa1	191	} val;
34d0f179 GJ	192	};
	193
	194	extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
	195	dev_t dev);
4c9eefa1 VG	196	extern uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg,
	197	dev_t dev);
	198	extern uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg,
	199	dev_t dev);
7702e8f4 VG	200	extern unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg,
	201	dev_t dev);
	202	extern unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg,
	203	dev_t dev);
34d0f179	204
ca32aefc TH	205	typedef void (blkio_unlink_group_fn)(struct request_queue *q,
ca32aefc TH	206	struct blkio_group *blkg);
72e06c25	207	typedef bool (blkio_clear_queue_fn)(struct request_queue *q);
ca32aefc	208	typedef void (blkio_update_group_weight_fn)(struct request_queue *q,
fe071437	209	struct blkio_group *blkg, unsigned int weight);
ca32aefc	210	typedef void (blkio_update_group_read_bps_fn)(struct request_queue *q,
fe071437	211	struct blkio_group *blkg, u64 read_bps);
ca32aefc	212	typedef void (blkio_update_group_write_bps_fn)(struct request_queue *q,
fe071437	213	struct blkio_group *blkg, u64 write_bps);
ca32aefc	214	typedef void (blkio_update_group_read_iops_fn)(struct request_queue *q,
fe071437	215	struct blkio_group *blkg, unsigned int read_iops);
ca32aefc	216	typedef void (blkio_update_group_write_iops_fn)(struct request_queue *q,
fe071437	217	struct blkio_group *blkg, unsigned int write_iops);
3e252066 VG	218
	219	struct blkio_policy_ops {
	220	blkio_unlink_group_fn *blkio_unlink_group_fn;
72e06c25	221	blkio_clear_queue_fn *blkio_clear_queue_fn;
3e252066	222	blkio_update_group_weight_fn *blkio_update_group_weight_fn;
4c9eefa1 VG	223	blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn;
4c9eefa1 VG	224	blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn;
7702e8f4 VG	225	blkio_update_group_read_iops_fn *blkio_update_group_read_iops_fn;
7702e8f4 VG	226	blkio_update_group_write_iops_fn *blkio_update_group_write_iops_fn;
3e252066 VG	227	};
	228
	229	struct blkio_policy_type {
	230	struct list_head list;
	231	struct blkio_policy_ops ops;
062a644d	232	enum blkio_policy_id plid;
3e252066 VG	233	};
	234
	235	/* Blkio controller policy registration */
	236	extern void blkio_policy_register(struct blkio_policy_type *);
	237	extern void blkio_policy_unregister(struct blkio_policy_type *);
72e06c25	238	extern void blkg_destroy_all(struct request_queue *q);
3e252066	239
afc24d49 VG	240	static inline char blkg_path(struct blkio_group blkg)
	241	{
	242	return blkg->path;
	243	}
	244
2f5ea477 JA	245	#else
	246
	247	struct blkio_group {
	248	};
	249
3e252066 VG	250	struct blkio_policy_type {
	251	};
	252
	253	static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
	254	static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
72e06c25	255	static inline void blkg_destroy_all(struct request_queue *q) { }
3e252066	256
afc24d49 VG	257	static inline char blkg_path(struct blkio_group blkg) { return NULL; }
afc24d49 VG	258
2f5ea477 JA	259	#endif
2f5ea477 JA	260
df457f84	261	#define BLKIO_WEIGHT_MIN 10
31e4c28d VG	262	#define BLKIO_WEIGHT_MAX 1000
	263	#define BLKIO_WEIGHT_DEFAULT 500
	264
2868ef7b	265	#ifdef CONFIG_DEBUG_BLK_CGROUP
a11cdaa7	266	void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
9195291e	267	void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
22084190	268	unsigned long dequeue);
812df48d DS	269	void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
812df48d DS	270	void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
e5ff082e	271	void blkiocg_set_start_empty_time(struct blkio_group *blkg);
812df48d DS	272
	273	#define BLKG_FLAG_FNS(name) \
	274	static inline void blkio_mark_blkg_##name( \
	275	struct blkio_group_stats *stats) \
	276	{ \
	277	stats->flags \|= (1 << BLKG_##name); \
	278	} \
	279	static inline void blkio_clear_blkg_##name( \
	280	struct blkio_group_stats *stats) \
	281	{ \
	282	stats->flags &= ~(1 << BLKG_##name); \
	283	} \
	284	static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \
	285	{ \
	286	return (stats->flags & (1 << BLKG_##name)) != 0; \
	287	} \
	288
	289	BLKG_FLAG_FNS(waiting)
	290	BLKG_FLAG_FNS(idling)
	291	BLKG_FLAG_FNS(empty)
	292	#undef BLKG_FLAG_FNS
2868ef7b	293	#else
a11cdaa7	294	static inline void blkiocg_update_avg_queue_size_stats(
cdc1184c	295	struct blkio_group *blkg) {}
9195291e DS	296	static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
9195291e DS	297	unsigned long dequeue) {}
812df48d DS	298	static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
	299	{}
	300	static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
e5ff082e	301	static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
2868ef7b VG	302	#endif
2868ef7b VG	303
32e380ae	304	#ifdef CONFIG_BLK_CGROUP
31e4c28d VG	305	extern struct blkio_cgroup blkio_root_cgroup;
31e4c28d VG	306	extern struct blkio_cgroup cgroup_to_blkio_cgroup(struct cgroup cgroup);
70087dc3	307	extern struct blkio_cgroup task_blkio_cgroup(struct task_struct tsk);
31e4c28d	308	extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
ca32aefc	309	struct blkio_group blkg, struct request_queue q, dev_t dev,
062a644d	310	enum blkio_policy_id plid);
5624a4e4	311	extern int blkio_alloc_blkg_stats(struct blkio_group *blkg);
31e4c28d VG	312	extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
31e4c28d VG	313	extern struct blkio_group blkiocg_lookup_group(struct blkio_cgroup blkcg,
ca32aefc TH	314	struct request_queue *q,
ca32aefc TH	315	enum blkio_policy_id plid);
303a3acb	316	void blkiocg_update_timeslice_used(struct blkio_group *blkg,
167400d3 JT	317	unsigned long time,
167400d3 JT	318	unsigned long unaccounted_time);
84c124da DS	319	void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
	320	bool direction, bool sync);
	321	void blkiocg_update_completion_stats(struct blkio_group *blkg,
	322	uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
812d4026 DS	323	void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
812d4026 DS	324	bool sync);
a11cdaa7	325	void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	326	struct blkio_group *curr_blkg, bool direction, bool sync);
a11cdaa7	327	void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	328	bool direction, bool sync);
31e4c28d	329	#else
2f5ea477	330	struct cgroup;
31e4c28d VG	331	static inline struct blkio_cgroup *
31e4c28d VG	332	cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
70087dc3 VG	333	static inline struct blkio_cgroup *
70087dc3 VG	334	task_blkio_cgroup(struct task_struct *tsk) { return NULL; }
31e4c28d VG	335
31e4c28d VG	336	static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
062a644d VG	337	struct blkio_group blkg, void key, dev_t dev,
062a644d VG	338	enum blkio_policy_id plid) {}
31e4c28d	339
5624a4e4 VG	340	static inline int blkio_alloc_blkg_stats(struct blkio_group *blkg) { return 0; }
5624a4e4 VG	341
31e4c28d VG	342	static inline int
	343	blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
	344
	345	static inline struct blkio_group *
	346	blkiocg_lookup_group(struct blkio_cgroup blkcg, void key) { return NULL; }
303a3acb	347	static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
167400d3 JT	348	unsigned long time,
	349	unsigned long unaccounted_time)
	350	{}
84c124da DS	351	static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
	352	uint64_t bytes, bool direction, bool sync) {}
	353	static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
	354	uint64_t start_time, uint64_t io_start_time, bool direction,
	355	bool sync) {}
812d4026 DS	356	static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
812d4026 DS	357	bool direction, bool sync) {}
a11cdaa7	358	static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	359	struct blkio_group *curr_blkg, bool direction, bool sync) {}
a11cdaa7	360	static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	361	bool direction, bool sync) {}
31e4c28d VG	362	#endif
31e4c28d VG	363	#endif /* _BLK_CGROUP_H */