[linux-2.6-block.git] / include / linux / blk-mq.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BLK_MQ_H
#define BLK_MQ_H

#include <linux/blkdev.h>
#include <linux/sbitmap.h>
#include <linux/srcu.h>

struct blk_mq_tags;
struct blk_flush_queue;

/**
 * struct blk_mq_hw_ctx - State for a hardware queue facing the hardware block device
 */
struct blk_mq_hw_ctx {
	struct {
		spinlock_t		lock;
		struct list_head	dispatch;
		unsigned long		state;		/* BLK_MQ_S_* flags */
	} ____cacheline_aligned_in_smp;

	struct delayed_work	run_work;
	cpumask_var_t		cpumask;
	int			next_cpu;
	int			next_cpu_batch;

	unsigned long		flags;		/* BLK_MQ_F_* flags */

	void			*sched_data;
	struct request_queue	*queue;
	struct blk_flush_queue	*fq;

	void			*driver_data;

	struct sbitmap		ctx_map;

	struct blk_mq_ctx	*dispatch_from;

	struct blk_mq_ctx	**ctxs;
	unsigned int		nr_ctx;

	wait_queue_entry_t	dispatch_wait;
	atomic_t		wait_index;

	struct blk_mq_tags	*tags;
	struct blk_mq_tags	*sched_tags;

	unsigned long		queued;
	unsigned long		run;
#define BLK_MQ_MAX_DISPATCH_ORDER	7
	unsigned long		dispatched[BLK_MQ_MAX_DISPATCH_ORDER];

	unsigned int		numa_node;
	unsigned int		queue_num;

	atomic_t		nr_active;
	unsigned int		nr_expired;

	struct hlist_node	cpuhp_dead;
	struct kobject		kobj;

	unsigned long		poll_considered;
	unsigned long		poll_invoked;
	unsigned long		poll_success;

#ifdef CONFIG_BLK_DEBUG_FS
	struct dentry		*debugfs_dir;
	struct dentry		*sched_debugfs_dir;
#endif

	/* Must be the last member - see also blk_mq_hw_ctx_size(). */
	struct srcu_struct	srcu[0];
};

struct blk_mq_tag_set {
	unsigned int		*mq_map;
	const struct blk_mq_ops	*ops;
	unsigned int		nr_hw_queues;
	unsigned int		queue_depth;	/* max hw supported */
	unsigned int		reserved_tags;
	unsigned int		cmd_size;	/* per-request extra data */
	int			numa_node;
	unsigned int		timeout;
	unsigned int		flags;		/* BLK_MQ_F_* */
	void			*driver_data;

	struct blk_mq_tags	**tags;

	struct mutex		tag_list_lock;
	struct list_head	tag_list;
};

struct blk_mq_queue_data {
	struct request *rq;
	bool last;
};

typedef blk_status_t (queue_rq_fn)(struct blk_mq_hw_ctx *,
		const struct blk_mq_queue_data *);
typedef bool (get_budget_fn)(struct blk_mq_hw_ctx *);
typedef void (put_budget_fn)(struct blk_mq_hw_ctx *);
typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
typedef int (init_request_fn)(struct blk_mq_tag_set *set, struct request *,
		unsigned int, unsigned int);
typedef void (exit_request_fn)(struct blk_mq_tag_set *set, struct request *,
		unsigned int);

typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
		bool);
typedef void (busy_tag_iter_fn)(struct request *, void *, bool);
typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
typedef int (map_queues_fn)(struct blk_mq_tag_set *set);


struct blk_mq_ops {
	/*
	 * Queue request
	 */
	queue_rq_fn		*queue_rq;

	/*
	 * Reserve budget before queue request, once .queue_rq is
	 * run, it is driver's responsibility to release the
	 * reserved budget. Also we have to handle failure case
	 * of .get_budget for avoiding I/O deadlock.
	 */
	get_budget_fn		*get_budget;
	put_budget_fn		*put_budget;

	/*
	 * Called on request timeout
	 */
	timeout_fn		*timeout;

	/*
	 * Called to poll for completion of a specific tag.
	 */
	poll_fn			*poll;

	softirq_done_fn		*complete;

	/*
	 * Called when the block layer side of a hardware queue has been
	 * set up, allowing the driver to allocate/init matching structures.
	 * Ditto for exit/teardown.
	 */
	init_hctx_fn		*init_hctx;
	exit_hctx_fn		*exit_hctx;

	/*
	 * Called for every command allocated by the block layer to allow
	 * the driver to set up driver specific data.
	 *
	 * Tag greater than or equal to queue_depth is for setting up
	 * flush request.
	 *
	 * Ditto for exit/teardown.
	 */
	init_request_fn		*init_request;
	exit_request_fn		*exit_request;
	/* Called from inside blk_get_request() */
	void (*initialize_rq_fn)(struct request *rq);

	map_queues_fn		*map_queues;

#ifdef CONFIG_BLK_DEBUG_FS
	/*
	 * Used by the debugfs implementation to show driver-specific
	 * information about a request.
	 */
	void (*show_rq)(struct seq_file *m, struct request *rq);
#endif
};

enum {
	BLK_MQ_F_SHOULD_MERGE	= 1 << 0,
	BLK_MQ_F_TAG_SHARED	= 1 << 1,
	BLK_MQ_F_SG_MERGE	= 1 << 2,
	BLK_MQ_F_BLOCKING	= 1 << 5,
	BLK_MQ_F_NO_SCHED	= 1 << 6,
	BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
	BLK_MQ_F_ALLOC_POLICY_BITS = 1,

	BLK_MQ_S_STOPPED	= 0,
	BLK_MQ_S_TAG_ACTIVE	= 1,
	BLK_MQ_S_SCHED_RESTART	= 2,

	BLK_MQ_MAX_DEPTH	= 10240,

	BLK_MQ_CPU_WORK_BATCH	= 8,
};
#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
	((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
		((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
	((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
		<< BLK_MQ_F_ALLOC_POLICY_START_BIT)

struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
						  struct request_queue *q);
int blk_mq_register_dev(struct device *, struct request_queue *);
void blk_mq_unregister_dev(struct device *, struct request_queue *);

int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
void blk_mq_free_tag_set(struct blk_mq_tag_set *set);

void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);

void blk_mq_free_request(struct request *rq);
bool blk_mq_can_queue(struct blk_mq_hw_ctx *);

enum {
	/* return when out of requests */
	BLK_MQ_REQ_NOWAIT	= (__force blk_mq_req_flags_t)(1 << 0),
	/* allocate from reserved pool */
	BLK_MQ_REQ_RESERVED	= (__force blk_mq_req_flags_t)(1 << 1),
	/* allocate internal/sched tag */
	BLK_MQ_REQ_INTERNAL	= (__force blk_mq_req_flags_t)(1 << 2),
	/* set RQF_PREEMPT */
	BLK_MQ_REQ_PREEMPT	= (__force blk_mq_req_flags_t)(1 << 3),
};

struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op,
		blk_mq_req_flags_t flags);
struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
		unsigned int op, blk_mq_req_flags_t flags,
		unsigned int hctx_idx);
struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);

enum {
	BLK_MQ_UNIQUE_TAG_BITS = 16,
	BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
};

u32 blk_mq_unique_tag(struct request *rq);

static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
{
	return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
}

static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
{
	return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
}


int blk_mq_request_started(struct request *rq);
void blk_mq_start_request(struct request *rq);
void blk_mq_end_request(struct request *rq, blk_status_t error);
void __blk_mq_end_request(struct request *rq, blk_status_t error);

void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
				bool kick_requeue_list);
void blk_mq_kick_requeue_list(struct request_queue *q);
void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
void blk_mq_complete_request(struct request *rq);
bool blk_mq_bio_list_merge(struct request_queue *q, struct list_head *list,
			   struct bio *bio);
bool blk_mq_queue_stopped(struct request_queue *q);
void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
void blk_mq_stop_hw_queues(struct request_queue *q);
void blk_mq_start_hw_queues(struct request_queue *q);
void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
void blk_mq_quiesce_queue(struct request_queue *q);
void blk_mq_unquiesce_queue(struct request_queue *q);
void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
bool blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
void blk_mq_run_hw_queues(struct request_queue *q, bool async);
void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
		busy_tag_iter_fn *fn, void *priv);
void blk_mq_freeze_queue(struct request_queue *q);
void blk_mq_unfreeze_queue(struct request_queue *q);
void blk_freeze_queue_start(struct request_queue *q);
void blk_mq_freeze_queue_wait(struct request_queue *q);
int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
				     unsigned long timeout);

int blk_mq_map_queues(struct blk_mq_tag_set *set);
void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);

void blk_mq_quiesce_queue_nowait(struct request_queue *q);

/*
 * Driver command data is immediately after the request. So subtract request
 * size to get back to the original request, add request size to get the PDU.
 */
static inline struct request *blk_mq_rq_from_pdu(void *pdu)
{
	return pdu - sizeof(struct request);
}
static inline void *blk_mq_rq_to_pdu(struct request *rq)
{
	return rq + 1;
}

#define queue_for_each_hw_ctx(q, hctx, i)				\
	for ((i) = 0; (i) < (q)->nr_hw_queues &&			\
	     ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)

#define hctx_for_each_ctx(hctx, ctx, i)					\
	for ((i) = 0; (i) < (hctx)->nr_ctx &&				\
	     ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
320ae51f JA	2	#ifndef BLK_MQ_H
	3	#define BLK_MQ_H
	4
	5	#include <linux/blkdev.h>
88459642	6	#include <linux/sbitmap.h>
6a83e74d	7	#include <linux/srcu.h>
320ae51f JA	8
320ae51f JA	9	struct blk_mq_tags;
f70ced09	10	struct blk_flush_queue;
320ae51f	11
fe644072 LW	12	/**
	13	* struct blk_mq_hw_ctx - State for a hardware queue facing the hardware block device
	14	*/
320ae51f JA	15	struct blk_mq_hw_ctx {
	16	struct {
	17	spinlock_t lock;
	18	struct list_head dispatch;
8d354f13	19	unsigned long state; /* BLK_MQ_S_* flags */
320ae51f JA	20	} ____cacheline_aligned_in_smp;
320ae51f JA	21
9f993737	22	struct delayed_work run_work;
e4043dcf	23	cpumask_var_t cpumask;
506e931f JA	24	int next_cpu;
506e931f JA	25	int next_cpu_batch;
320ae51f JA	26
	27	unsigned long flags; /* BLK_MQ_F_* flags */
	28
bd166ef1	29	void *sched_data;
320ae51f	30	struct request_queue *queue;
f70ced09	31	struct blk_flush_queue *fq;
320ae51f JA	32
	33	void *driver_data;
	34
88459642	35	struct sbitmap ctx_map;
1429d7c9	36
b347689f ML	37	struct blk_mq_ctx *dispatch_from;
b347689f ML	38
4bb659b1	39	struct blk_mq_ctx **ctxs;
8d354f13	40	unsigned int nr_ctx;
4bb659b1	41
eb619fdb	42	wait_queue_entry_t dispatch_wait;
8537b120	43	atomic_t wait_index;
320ae51f	44
320ae51f	45	struct blk_mq_tags *tags;
bd166ef1	46	struct blk_mq_tags *sched_tags;
320ae51f JA	47
	48	unsigned long queued;
	49	unsigned long run;
8d354f13	50	#define BLK_MQ_MAX_DISPATCH_ORDER 7
320ae51f JA	51	unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
320ae51f JA	52
320ae51f	53	unsigned int numa_node;
17ded320	54	unsigned int queue_num;
320ae51f	55
0d2602ca	56	atomic_t nr_active;
1d9bd516	57	unsigned int nr_expired;
0d2602ca	58
9467f859	59	struct hlist_node cpuhp_dead;
320ae51f	60	struct kobject kobj;
05229bee	61
6e219353	62	unsigned long poll_considered;
05229bee JA	63	unsigned long poll_invoked;
05229bee JA	64	unsigned long poll_success;
9c1051aa OS	65
	66	#ifdef CONFIG_BLK_DEBUG_FS
	67	struct dentry *debugfs_dir;
d332ce09	68	struct dentry *sched_debugfs_dir;
9c1051aa	69	#endif
07319678 BVA	70
07319678 BVA	71	/* Must be the last member - see also blk_mq_hw_ctx_size(). */
05707b64	72	struct srcu_struct srcu[0];
320ae51f JA	73	};
320ae51f JA	74
24d2f903	75	struct blk_mq_tag_set {
bdd17e75	76	unsigned int *mq_map;
f8a5b122	77	const struct blk_mq_ops *ops;
320ae51f	78	unsigned int nr_hw_queues;
e3a2b3f9	79	unsigned int queue_depth; /* max hw supported */
320ae51f JA	80	unsigned int reserved_tags;
	81	unsigned int cmd_size; /* per-request extra data */
	82	int numa_node;
	83	unsigned int timeout;
	84	unsigned int flags; /* BLK_MQ_F_* */
24d2f903 CH	85	void *driver_data;
	86
	87	struct blk_mq_tags **tags;
0d2602ca JA	88
	89	struct mutex tag_list_lock;
	90	struct list_head tag_list;
320ae51f JA	91	};
320ae51f JA	92
74c45052 JA	93	struct blk_mq_queue_data {
74c45052 JA	94	struct request *rq;
74c45052 JA	95	bool last;
	96	};
	97
fc17b653 CH	98	typedef blk_status_t (queue_rq_fn)(struct blk_mq_hw_ctx *,
fc17b653 CH	99	const struct blk_mq_queue_data *);
88022d72	100	typedef bool (get_budget_fn)(struct blk_mq_hw_ctx *);
de148297	101	typedef void (put_budget_fn)(struct blk_mq_hw_ctx *);
0152fb6b	102	typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
320ae51f JA	103	typedef int (init_hctx_fn)(struct blk_mq_hw_ctx , void , unsigned int);
320ae51f JA	104	typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
d6296d39	105	typedef int (init_request_fn)(struct blk_mq_tag_set set, struct request ,
24d2f903	106	unsigned int, unsigned int);
d6296d39	107	typedef void (exit_request_fn)(struct blk_mq_tag_set set, struct request ,
24d2f903	108	unsigned int);
320ae51f	109
81481eb4 CH	110	typedef void (busy_iter_fn)(struct blk_mq_hw_ctx , struct request , void *,
81481eb4 CH	111	bool);
f26cdc85	112	typedef void (busy_tag_iter_fn)(struct request , void , bool);
05229bee	113	typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
da695ba2	114	typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
05229bee	115
81481eb4	116
320ae51f JA	117	struct blk_mq_ops {
	118	/*
	119	* Queue request
	120	*/
	121	queue_rq_fn *queue_rq;
	122
de148297 ML	123	/*
	124	* Reserve budget before queue request, once .queue_rq is
	125	* run, it is driver's responsibility to release the
	126	* reserved budget. Also we have to handle failure case
	127	* of .get_budget for avoiding I/O deadlock.
	128	*/
	129	get_budget_fn *get_budget;
	130	put_budget_fn *put_budget;
	131
320ae51f JA	132	/*
	133	* Called on request timeout
	134	*/
0152fb6b	135	timeout_fn *timeout;
320ae51f	136
05229bee JA	137	/*
	138	* Called to poll for completion of a specific tag.
	139	*/
	140	poll_fn *poll;
	141
30a91cb4 CH	142	softirq_done_fn *complete;
30a91cb4 CH	143
320ae51f JA	144	/*
	145	* Called when the block layer side of a hardware queue has been
	146	* set up, allowing the driver to allocate/init matching structures.
	147	* Ditto for exit/teardown.
	148	*/
	149	init_hctx_fn *init_hctx;
	150	exit_hctx_fn *exit_hctx;
e9b267d9 CH	151
	152	/*
	153	* Called for every command allocated by the block layer to allow
	154	* the driver to set up driver specific data.
f70ced09 ML	155	*
	156	* Tag greater than or equal to queue_depth is for setting up
	157	* flush request.
	158	*
e9b267d9 CH	159	* Ditto for exit/teardown.
	160	*/
	161	init_request_fn *init_request;
	162	exit_request_fn *exit_request;
d280bab3 BVA	163	/* Called from inside blk_get_request() */
d280bab3 BVA	164	void (initialize_rq_fn)(struct request rq);
da695ba2 CH	165
da695ba2 CH	166	map_queues_fn *map_queues;
2836ee4b BVA	167
	168	#ifdef CONFIG_BLK_DEBUG_FS
	169	/*
	170	* Used by the debugfs implementation to show driver-specific
	171	* information about a request.
	172	*/
	173	void (show_rq)(struct seq_file m, struct request *rq);
	174	#endif
320ae51f JA	175	};
	176
	177	enum {
320ae51f	178	BLK_MQ_F_SHOULD_MERGE = 1 << 0,
8a58d1f1 JA	179	BLK_MQ_F_TAG_SHARED = 1 << 1,
8a58d1f1 JA	180	BLK_MQ_F_SG_MERGE = 1 << 2,
1b792f2f	181	BLK_MQ_F_BLOCKING = 1 << 5,
d3484991	182	BLK_MQ_F_NO_SCHED = 1 << 6,
24391c0d SL	183	BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
24391c0d SL	184	BLK_MQ_F_ALLOC_POLICY_BITS = 1,
320ae51f	185
5d12f905	186	BLK_MQ_S_STOPPED = 0,
0d2602ca	187	BLK_MQ_S_TAG_ACTIVE = 1,
bd166ef1	188	BLK_MQ_S_SCHED_RESTART = 2,
320ae51f	189
a4391c64	190	BLK_MQ_MAX_DEPTH = 10240,
506e931f JA	191
506e931f JA	192	BLK_MQ_CPU_WORK_BATCH = 8,
320ae51f	193	};
24391c0d SL	194	#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
	195	((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
	196	((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
	197	#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
	198	((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
	199	<< BLK_MQ_F_ALLOC_POLICY_START_BIT)
320ae51f	200
24d2f903	201	struct request_queue blk_mq_init_queue(struct blk_mq_tag_set );
b62c21b7 MS	202	struct request_queue blk_mq_init_allocated_queue(struct blk_mq_tag_set set,
b62c21b7 MS	203	struct request_queue *q);
b21d5b30 MB	204	int blk_mq_register_dev(struct device , struct request_queue );
b21d5b30 MB	205	void blk_mq_unregister_dev(struct device , struct request_queue );
320ae51f	206
24d2f903 CH	207	int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
	208	void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
	209
320ae51f JA	210	void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
320ae51f JA	211
320ae51f JA	212	void blk_mq_free_request(struct request *rq);
320ae51f JA	213	bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
6f3b0e8b CH	214
6f3b0e8b CH	215	enum {
9a95e4ef BVA	216	/* return when out of requests */
	217	BLK_MQ_REQ_NOWAIT = (__force blk_mq_req_flags_t)(1 << 0),
	218	/* allocate from reserved pool */
	219	BLK_MQ_REQ_RESERVED = (__force blk_mq_req_flags_t)(1 << 1),
	220	/* allocate internal/sched tag */
	221	BLK_MQ_REQ_INTERNAL = (__force blk_mq_req_flags_t)(1 << 2),
	222	/* set RQF_PREEMPT */
	223	BLK_MQ_REQ_PREEMPT = (__force blk_mq_req_flags_t)(1 << 3),
6f3b0e8b CH	224	};
6f3b0e8b CH	225
cd6ce148	226	struct request blk_mq_alloc_request(struct request_queue q, unsigned int op,
9a95e4ef	227	blk_mq_req_flags_t flags);
cd6ce148	228	struct request blk_mq_alloc_request_hctx(struct request_queue q,
9a95e4ef BVA	229	unsigned int op, blk_mq_req_flags_t flags,
9a95e4ef BVA	230	unsigned int hctx_idx);
0e62f51f	231	struct request blk_mq_tag_to_rq(struct blk_mq_tags tags, unsigned int tag);
320ae51f	232
205fb5f5 BVA	233	enum {
	234	BLK_MQ_UNIQUE_TAG_BITS = 16,
	235	BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
	236	};
	237
	238	u32 blk_mq_unique_tag(struct request *rq);
	239
	240	static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
	241	{
	242	return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
	243	}
	244
	245	static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
	246	{
	247	return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
	248	}
	249
320ae51f	250
973c0191	251	int blk_mq_request_started(struct request *rq);
e2490073	252	void blk_mq_start_request(struct request *rq);
2a842aca CH	253	void blk_mq_end_request(struct request *rq, blk_status_t error);
2a842aca CH	254	void __blk_mq_end_request(struct request *rq, blk_status_t error);
320ae51f	255
2b053aca BVA	256	void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
	257	void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
	258	bool kick_requeue_list);
6fca6a61	259	void blk_mq_kick_requeue_list(struct request_queue *q);
2849450a	260	void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
08e0029a	261	void blk_mq_complete_request(struct request *rq);
9c558734 JA	262	bool blk_mq_bio_list_merge(struct request_queue q, struct list_head list,
9c558734 JA	263	struct bio *bio);
fd001443	264	bool blk_mq_queue_stopped(struct request_queue *q);
320ae51f JA	265	void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
320ae51f JA	266	void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
280d45f6	267	void blk_mq_stop_hw_queues(struct request_queue *q);
2f268556	268	void blk_mq_start_hw_queues(struct request_queue *q);
ae911c5e	269	void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
1b4a3258	270	void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
97e01209	271	void blk_mq_quiesce_queue(struct request_queue *q);
e4e73913	272	void blk_mq_unquiesce_queue(struct request_queue *q);
7587a5ae	273	void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
79f720a7	274	bool blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
b94ec296	275	void blk_mq_run_hw_queues(struct request_queue *q, bool async);
e0489487 SG	276	void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
e0489487 SG	277	busy_tag_iter_fn fn, void priv);
c761d96b	278	void blk_mq_freeze_queue(struct request_queue *q);
b4c6a028	279	void blk_mq_unfreeze_queue(struct request_queue *q);
1671d522	280	void blk_freeze_queue_start(struct request_queue *q);
6bae363e	281	void blk_mq_freeze_queue_wait(struct request_queue *q);
f91328c4 KB	282	int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
f91328c4 KB	283	unsigned long timeout);
320ae51f	284
9e5a7e22	285	int blk_mq_map_queues(struct blk_mq_tag_set *set);
868f2f0b KB	286	void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
868f2f0b KB	287
852ec809	288	void blk_mq_quiesce_queue_nowait(struct request_queue *q);
4f084b41	289
320ae51f JA	290	/*
320ae51f JA	291	* Driver command data is immediately after the request. So subtract request
2963e3f7	292	* size to get back to the original request, add request size to get the PDU.
320ae51f JA	293	*/
	294	static inline struct request blk_mq_rq_from_pdu(void pdu)
	295	{
	296	return pdu - sizeof(struct request);
	297	}
	298	static inline void blk_mq_rq_to_pdu(struct request rq)
	299	{
2963e3f7	300	return rq + 1;
320ae51f JA	301	}
320ae51f JA	302
320ae51f	303	#define queue_for_each_hw_ctx(q, hctx, i) \
0d0b7d42 JA	304	for ((i) = 0; (i) < (q)->nr_hw_queues && \
0d0b7d42 JA	305	({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
320ae51f	306
320ae51f	307	#define hctx_for_each_ctx(hctx, ctx, i) \
0d0b7d42 JA	308	for ((i) = 0; (i) < (hctx)->nr_ctx && \
0d0b7d42 JA	309	({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
320ae51f	310
320ae51f	311	#endif