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

#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 {
	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	**ctxs;
	unsigned int		nr_ctx;

	wait_queue_t		dispatch_wait;
	atomic_t		wait_index;

	struct blk_mq_tags	*tags;
	struct blk_mq_tags	*sched_tags;

	struct srcu_struct	queue_rq_srcu;

	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;

	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
};

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 int (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *);
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 int (reinit_request_fn)(void *, struct request *);

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;

	/*
	 * 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;
	reinit_request_fn	*reinit_request;

	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_RQ_QUEUE_OK	= 0,	/* queued fine */
	BLK_MQ_RQ_QUEUE_BUSY	= 1,	/* requeue IO for later */
	BLK_MQ_RQ_QUEUE_ERROR	= 2,	/* end IO with error */

	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_S_TAG_WAITING	= 3,
	BLK_MQ_S_START_ON_RUN	= 4,

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

struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
		unsigned int flags);
struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int op,
		unsigned int 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, int error);
void __blk_mq_end_request(struct request *rq, int 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_abort_requeue_list(struct request_queue *q);
void blk_mq_complete_request(struct request *rq);

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_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
void 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_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
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_reinit_tagset(struct blk_mq_tag_set *set);

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);

/*
 * 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
320ae51f JA	1	#ifndef BLK_MQ_H
	2	#define BLK_MQ_H
	3
	4	#include <linux/blkdev.h>
88459642	5	#include <linux/sbitmap.h>
6a83e74d	6	#include <linux/srcu.h>
320ae51f JA	7
320ae51f JA	8	struct blk_mq_tags;
f70ced09	9	struct blk_flush_queue;
320ae51f	10
320ae51f JA	11	struct blk_mq_hw_ctx {
	12	struct {
	13	spinlock_t lock;
	14	struct list_head dispatch;
8d354f13	15	unsigned long state; /* BLK_MQ_S_* flags */
320ae51f JA	16	} ____cacheline_aligned_in_smp;
320ae51f JA	17
9f993737	18	struct delayed_work run_work;
e4043dcf	19	cpumask_var_t cpumask;
506e931f JA	20	int next_cpu;
506e931f JA	21	int next_cpu_batch;
320ae51f JA	22
	23	unsigned long flags; /* BLK_MQ_F_* flags */
	24
bd166ef1	25	void *sched_data;
320ae51f	26	struct request_queue *queue;
f70ced09	27	struct blk_flush_queue *fq;
320ae51f JA	28
	29	void *driver_data;
	30
88459642	31	struct sbitmap ctx_map;
1429d7c9	32
4bb659b1	33	struct blk_mq_ctx **ctxs;
8d354f13	34	unsigned int nr_ctx;
4bb659b1	35
da55f2cc	36	wait_queue_t dispatch_wait;
8537b120	37	atomic_t wait_index;
320ae51f	38
320ae51f	39	struct blk_mq_tags *tags;
bd166ef1	40	struct blk_mq_tags *sched_tags;
320ae51f	41
6a83e74d BVA	42	struct srcu_struct queue_rq_srcu;
6a83e74d BVA	43
320ae51f JA	44	unsigned long queued;
320ae51f JA	45	unsigned long run;
8d354f13	46	#define BLK_MQ_MAX_DISPATCH_ORDER 7
320ae51f JA	47	unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
320ae51f JA	48
320ae51f	49	unsigned int numa_node;
17ded320	50	unsigned int queue_num;
320ae51f	51
0d2602ca JA	52	atomic_t nr_active;
0d2602ca JA	53
9467f859	54	struct hlist_node cpuhp_dead;
320ae51f	55	struct kobject kobj;
05229bee	56
6e219353	57	unsigned long poll_considered;
05229bee JA	58	unsigned long poll_invoked;
05229bee JA	59	unsigned long poll_success;
9c1051aa OS	60
	61	#ifdef CONFIG_BLK_DEBUG_FS
	62	struct dentry *debugfs_dir;
d332ce09	63	struct dentry *sched_debugfs_dir;
9c1051aa	64	#endif
320ae51f JA	65	};
320ae51f JA	66
24d2f903	67	struct blk_mq_tag_set {
bdd17e75	68	unsigned int *mq_map;
f8a5b122	69	const struct blk_mq_ops *ops;
320ae51f	70	unsigned int nr_hw_queues;
e3a2b3f9	71	unsigned int queue_depth; /* max hw supported */
320ae51f JA	72	unsigned int reserved_tags;
	73	unsigned int cmd_size; /* per-request extra data */
	74	int numa_node;
	75	unsigned int timeout;
	76	unsigned int flags; /* BLK_MQ_F_* */
24d2f903 CH	77	void *driver_data;
	78
	79	struct blk_mq_tags **tags;
0d2602ca JA	80
	81	struct mutex tag_list_lock;
	82	struct list_head tag_list;
320ae51f JA	83	};
320ae51f JA	84
74c45052 JA	85	struct blk_mq_queue_data {
74c45052 JA	86	struct request *rq;
74c45052 JA	87	bool last;
	88	};
	89
	90	typedef int (queue_rq_fn)(struct blk_mq_hw_ctx , const struct blk_mq_queue_data );
0152fb6b	91	typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
320ae51f JA	92	typedef int (init_hctx_fn)(struct blk_mq_hw_ctx , void , unsigned int);
320ae51f JA	93	typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
d6296d39	94	typedef int (init_request_fn)(struct blk_mq_tag_set set, struct request ,
24d2f903	95	unsigned int, unsigned int);
d6296d39	96	typedef void (exit_request_fn)(struct blk_mq_tag_set set, struct request ,
24d2f903	97	unsigned int);
486cf989	98	typedef int (reinit_request_fn)(void , struct request );
320ae51f	99
81481eb4 CH	100	typedef void (busy_iter_fn)(struct blk_mq_hw_ctx , struct request , void *,
81481eb4 CH	101	bool);
f26cdc85	102	typedef void (busy_tag_iter_fn)(struct request , void , bool);
05229bee	103	typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
da695ba2	104	typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
05229bee	105
81481eb4	106
320ae51f JA	107	struct blk_mq_ops {
	108	/*
	109	* Queue request
	110	*/
	111	queue_rq_fn *queue_rq;
	112
320ae51f JA	113	/*
	114	* Called on request timeout
	115	*/
0152fb6b	116	timeout_fn *timeout;
320ae51f	117
05229bee JA	118	/*
	119	* Called to poll for completion of a specific tag.
	120	*/
	121	poll_fn *poll;
	122
30a91cb4 CH	123	softirq_done_fn *complete;
30a91cb4 CH	124
320ae51f JA	125	/*
	126	* Called when the block layer side of a hardware queue has been
	127	* set up, allowing the driver to allocate/init matching structures.
	128	* Ditto for exit/teardown.
	129	*/
	130	init_hctx_fn *init_hctx;
	131	exit_hctx_fn *exit_hctx;
e9b267d9 CH	132
	133	/*
	134	* Called for every command allocated by the block layer to allow
	135	* the driver to set up driver specific data.
f70ced09 ML	136	*
	137	* Tag greater than or equal to queue_depth is for setting up
	138	* flush request.
	139	*
e9b267d9 CH	140	* Ditto for exit/teardown.
	141	*/
	142	init_request_fn *init_request;
	143	exit_request_fn *exit_request;
486cf989	144	reinit_request_fn *reinit_request;
da695ba2 CH	145
da695ba2 CH	146	map_queues_fn *map_queues;
2836ee4b BVA	147
	148	#ifdef CONFIG_BLK_DEBUG_FS
	149	/*
	150	* Used by the debugfs implementation to show driver-specific
	151	* information about a request.
	152	*/
	153	void (show_rq)(struct seq_file m, struct request *rq);
	154	#endif
320ae51f JA	155	};
	156
	157	enum {
	158	BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */
	159	BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */
	160	BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */
	161
	162	BLK_MQ_F_SHOULD_MERGE = 1 << 0,
8a58d1f1 JA	163	BLK_MQ_F_TAG_SHARED = 1 << 1,
8a58d1f1 JA	164	BLK_MQ_F_SG_MERGE = 1 << 2,
1b792f2f	165	BLK_MQ_F_BLOCKING = 1 << 5,
d3484991	166	BLK_MQ_F_NO_SCHED = 1 << 6,
24391c0d SL	167	BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
24391c0d SL	168	BLK_MQ_F_ALLOC_POLICY_BITS = 1,
320ae51f	169
5d12f905	170	BLK_MQ_S_STOPPED = 0,
0d2602ca	171	BLK_MQ_S_TAG_ACTIVE = 1,
bd166ef1	172	BLK_MQ_S_SCHED_RESTART = 2,
da55f2cc	173	BLK_MQ_S_TAG_WAITING = 3,
21c6e939	174	BLK_MQ_S_START_ON_RUN = 4,
320ae51f	175
a4391c64	176	BLK_MQ_MAX_DEPTH = 10240,
506e931f JA	177
506e931f JA	178	BLK_MQ_CPU_WORK_BATCH = 8,
320ae51f	179	};
24391c0d SL	180	#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
	181	((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
	182	((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
	183	#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
	184	((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
	185	<< BLK_MQ_F_ALLOC_POLICY_START_BIT)
320ae51f	186
24d2f903	187	struct request_queue blk_mq_init_queue(struct blk_mq_tag_set );
b62c21b7 MS	188	struct request_queue blk_mq_init_allocated_queue(struct blk_mq_tag_set set,
b62c21b7 MS	189	struct request_queue *q);
b21d5b30 MB	190	int blk_mq_register_dev(struct device , struct request_queue );
b21d5b30 MB	191	void blk_mq_unregister_dev(struct device , struct request_queue );
320ae51f	192
24d2f903 CH	193	int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
	194	void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
	195
320ae51f JA	196	void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
320ae51f JA	197
320ae51f JA	198	void blk_mq_free_request(struct request *rq);
320ae51f JA	199	bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
6f3b0e8b CH	200
	201	enum {
	202	BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */
	203	BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */
bd166ef1	204	BLK_MQ_REQ_INTERNAL = (1 << 2), /* allocate internal/sched tag */
6f3b0e8b CH	205	};
6f3b0e8b CH	206
4ce01dd1	207	struct request blk_mq_alloc_request(struct request_queue q, int rw,
6f3b0e8b	208	unsigned int flags);
1f5bd336 ML	209	struct request blk_mq_alloc_request_hctx(struct request_queue q, int op,
1f5bd336 ML	210	unsigned int flags, unsigned int hctx_idx);
0e62f51f	211	struct request blk_mq_tag_to_rq(struct blk_mq_tags tags, unsigned int tag);
320ae51f	212
205fb5f5 BVA	213	enum {
	214	BLK_MQ_UNIQUE_TAG_BITS = 16,
	215	BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
	216	};
	217
	218	u32 blk_mq_unique_tag(struct request *rq);
	219
	220	static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
	221	{
	222	return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
	223	}
	224
	225	static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
	226	{
	227	return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
	228	}
	229
320ae51f	230
973c0191	231	int blk_mq_request_started(struct request *rq);
e2490073	232	void blk_mq_start_request(struct request *rq);
c8a446ad CH	233	void blk_mq_end_request(struct request *rq, int error);
c8a446ad CH	234	void __blk_mq_end_request(struct request *rq, int error);
320ae51f	235
2b053aca BVA	236	void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
	237	void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
	238	bool kick_requeue_list);
6fca6a61	239	void blk_mq_kick_requeue_list(struct request_queue *q);
2849450a	240	void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
1885b24d	241	void blk_mq_abort_requeue_list(struct request_queue *q);
08e0029a	242	void blk_mq_complete_request(struct request *rq);
30a91cb4	243
fd001443	244	bool blk_mq_queue_stopped(struct request_queue *q);
320ae51f JA	245	void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
320ae51f JA	246	void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
280d45f6	247	void blk_mq_stop_hw_queues(struct request_queue *q);
2f268556	248	void blk_mq_start_hw_queues(struct request_queue *q);
ae911c5e	249	void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
1b4a3258	250	void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
7587a5ae	251	void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
5b727272	252	void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
b94ec296	253	void blk_mq_run_hw_queues(struct request_queue *q, bool async);
70f4db63	254	void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
e0489487 SG	255	void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
e0489487 SG	256	busy_tag_iter_fn fn, void priv);
c761d96b	257	void blk_mq_freeze_queue(struct request_queue *q);
b4c6a028	258	void blk_mq_unfreeze_queue(struct request_queue *q);
1671d522	259	void blk_freeze_queue_start(struct request_queue *q);
6bae363e	260	void blk_mq_freeze_queue_wait(struct request_queue *q);
f91328c4 KB	261	int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
f91328c4 KB	262	unsigned long timeout);
486cf989	263	int blk_mq_reinit_tagset(struct blk_mq_tag_set *set);
320ae51f	264
9e5a7e22	265	int blk_mq_map_queues(struct blk_mq_tag_set *set);
868f2f0b KB	266	void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
868f2f0b KB	267
320ae51f JA	268	/*
320ae51f JA	269	* Driver command data is immediately after the request. So subtract request
2963e3f7	270	* size to get back to the original request, add request size to get the PDU.
320ae51f JA	271	*/
	272	static inline struct request blk_mq_rq_from_pdu(void pdu)
	273	{
	274	return pdu - sizeof(struct request);
	275	}
	276	static inline void blk_mq_rq_to_pdu(struct request rq)
	277	{
2963e3f7	278	return rq + 1;
320ae51f JA	279	}
320ae51f JA	280
320ae51f	281	#define queue_for_each_hw_ctx(q, hctx, i) \
0d0b7d42 JA	282	for ((i) = 0; (i) < (q)->nr_hw_queues && \
0d0b7d42 JA	283	({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
320ae51f	284
320ae51f	285	#define hctx_for_each_ctx(hctx, ctx, i) \
0d0b7d42 JA	286	for ((i) = 0; (i) < (hctx)->nr_ctx && \
0d0b7d42 JA	287	({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
320ae51f	288
320ae51f	289	#endif