[mirror_ubuntu-bionic-kernel.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 {
	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_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;

	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	queue_rq_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 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;

	/*
	 * 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_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, unsigned int op,
		unsigned int flags);
struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
		unsigned 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, 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_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);
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 (reinit_request)(void *, struct request *));

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
320ae51f JA	12	struct blk_mq_hw_ctx {
	13	struct {
	14	spinlock_t lock;
	15	struct list_head dispatch;
8d354f13	16	unsigned long state; /* BLK_MQ_S_* flags */
320ae51f JA	17	} ____cacheline_aligned_in_smp;
320ae51f JA	18
9f993737	19	struct delayed_work run_work;
e4043dcf	20	cpumask_var_t cpumask;
506e931f JA	21	int next_cpu;
506e931f JA	22	int next_cpu_batch;
320ae51f JA	23
	24	unsigned long flags; /* BLK_MQ_F_* flags */
	25
bd166ef1	26	void *sched_data;
320ae51f	27	struct request_queue *queue;
f70ced09	28	struct blk_flush_queue *fq;
320ae51f JA	29
	30	void *driver_data;
	31
88459642	32	struct sbitmap ctx_map;
1429d7c9	33
4bb659b1	34	struct blk_mq_ctx **ctxs;
8d354f13	35	unsigned int nr_ctx;
4bb659b1	36
ac6424b9	37	wait_queue_entry_t dispatch_wait;
8537b120	38	atomic_t wait_index;
320ae51f	39
320ae51f	40	struct blk_mq_tags *tags;
bd166ef1	41	struct blk_mq_tags *sched_tags;
320ae51f JA	42
	43	unsigned long queued;
	44	unsigned long run;
8d354f13	45	#define BLK_MQ_MAX_DISPATCH_ORDER 7
320ae51f JA	46	unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
320ae51f JA	47
320ae51f	48	unsigned int numa_node;
17ded320	49	unsigned int queue_num;
320ae51f	50
0d2602ca JA	51	atomic_t nr_active;
0d2602ca JA	52
9467f859	53	struct hlist_node cpuhp_dead;
320ae51f	54	struct kobject kobj;
05229bee	55
6e219353	56	unsigned long poll_considered;
05229bee JA	57	unsigned long poll_invoked;
05229bee JA	58	unsigned long poll_success;
9c1051aa OS	59
	60	#ifdef CONFIG_BLK_DEBUG_FS
	61	struct dentry *debugfs_dir;
d332ce09	62	struct dentry *sched_debugfs_dir;
9c1051aa	63	#endif
07319678 BVA	64
	65	/* Must be the last member - see also blk_mq_hw_ctx_size(). */
	66	struct srcu_struct queue_rq_srcu[0];
320ae51f JA	67	};
320ae51f JA	68
24d2f903	69	struct blk_mq_tag_set {
bdd17e75	70	unsigned int *mq_map;
f8a5b122	71	const struct blk_mq_ops *ops;
320ae51f	72	unsigned int nr_hw_queues;
e3a2b3f9	73	unsigned int queue_depth; /* max hw supported */
320ae51f JA	74	unsigned int reserved_tags;
	75	unsigned int cmd_size; /* per-request extra data */
	76	int numa_node;
	77	unsigned int timeout;
	78	unsigned int flags; /* BLK_MQ_F_* */
24d2f903 CH	79	void *driver_data;
	80
	81	struct blk_mq_tags **tags;
0d2602ca JA	82
	83	struct mutex tag_list_lock;
	84	struct list_head tag_list;
320ae51f JA	85	};
320ae51f JA	86
74c45052 JA	87	struct blk_mq_queue_data {
74c45052 JA	88	struct request *rq;
74c45052 JA	89	bool last;
	90	};
	91
fc17b653 CH	92	typedef blk_status_t (queue_rq_fn)(struct blk_mq_hw_ctx *,
fc17b653 CH	93	const struct blk_mq_queue_data *);
0152fb6b	94	typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
320ae51f JA	95	typedef int (init_hctx_fn)(struct blk_mq_hw_ctx , void , unsigned int);
320ae51f JA	96	typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
d6296d39	97	typedef int (init_request_fn)(struct blk_mq_tag_set set, struct request ,
24d2f903	98	unsigned int, unsigned int);
d6296d39	99	typedef void (exit_request_fn)(struct blk_mq_tag_set set, struct request ,
24d2f903	100	unsigned int);
320ae51f	101
81481eb4 CH	102	typedef void (busy_iter_fn)(struct blk_mq_hw_ctx , struct request , void *,
81481eb4 CH	103	bool);
f26cdc85	104	typedef void (busy_tag_iter_fn)(struct request , void , bool);
05229bee	105	typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
da695ba2	106	typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
05229bee	107
81481eb4	108
320ae51f JA	109	struct blk_mq_ops {
	110	/*
	111	* Queue request
	112	*/
	113	queue_rq_fn *queue_rq;
	114
320ae51f JA	115	/*
	116	* Called on request timeout
	117	*/
0152fb6b	118	timeout_fn *timeout;
320ae51f	119
05229bee JA	120	/*
	121	* Called to poll for completion of a specific tag.
	122	*/
	123	poll_fn *poll;
	124
30a91cb4 CH	125	softirq_done_fn *complete;
30a91cb4 CH	126
320ae51f JA	127	/*
	128	* Called when the block layer side of a hardware queue has been
	129	* set up, allowing the driver to allocate/init matching structures.
	130	* Ditto for exit/teardown.
	131	*/
	132	init_hctx_fn *init_hctx;
	133	exit_hctx_fn *exit_hctx;
e9b267d9 CH	134
	135	/*
	136	* Called for every command allocated by the block layer to allow
	137	* the driver to set up driver specific data.
f70ced09 ML	138	*
	139	* Tag greater than or equal to queue_depth is for setting up
	140	* flush request.
	141	*
e9b267d9 CH	142	* Ditto for exit/teardown.
	143	*/
	144	init_request_fn *init_request;
	145	exit_request_fn *exit_request;
d280bab3 BVA	146	/* Called from inside blk_get_request() */
d280bab3 BVA	147	void (initialize_rq_fn)(struct request rq);
da695ba2 CH	148
da695ba2 CH	149	map_queues_fn *map_queues;
2836ee4b BVA	150
	151	#ifdef CONFIG_BLK_DEBUG_FS
	152	/*
	153	* Used by the debugfs implementation to show driver-specific
	154	* information about a request.
	155	*/
	156	void (show_rq)(struct seq_file m, struct request *rq);
	157	#endif
320ae51f JA	158	};
	159
	160	enum {
320ae51f	161	BLK_MQ_F_SHOULD_MERGE = 1 << 0,
8a58d1f1 JA	162	BLK_MQ_F_TAG_SHARED = 1 << 1,
8a58d1f1 JA	163	BLK_MQ_F_SG_MERGE = 1 << 2,
1b792f2f	164	BLK_MQ_F_BLOCKING = 1 << 5,
d3484991	165	BLK_MQ_F_NO_SCHED = 1 << 6,
24391c0d SL	166	BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
24391c0d SL	167	BLK_MQ_F_ALLOC_POLICY_BITS = 1,
320ae51f	168
5d12f905	169	BLK_MQ_S_STOPPED = 0,
0d2602ca	170	BLK_MQ_S_TAG_ACTIVE = 1,
bd166ef1	171	BLK_MQ_S_SCHED_RESTART = 2,
da55f2cc	172	BLK_MQ_S_TAG_WAITING = 3,
21c6e939	173	BLK_MQ_S_START_ON_RUN = 4,
320ae51f	174
a4391c64	175	BLK_MQ_MAX_DEPTH = 10240,
506e931f JA	176
506e931f JA	177	BLK_MQ_CPU_WORK_BATCH = 8,
320ae51f	178	};
24391c0d SL	179	#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
	180	((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
	181	((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
	182	#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
	183	((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
	184	<< BLK_MQ_F_ALLOC_POLICY_START_BIT)
320ae51f	185
24d2f903	186	struct request_queue blk_mq_init_queue(struct blk_mq_tag_set );
b62c21b7 MS	187	struct request_queue blk_mq_init_allocated_queue(struct blk_mq_tag_set set,
b62c21b7 MS	188	struct request_queue *q);
b21d5b30 MB	189	int blk_mq_register_dev(struct device , struct request_queue );
b21d5b30 MB	190	void blk_mq_unregister_dev(struct device , struct request_queue );
320ae51f	191
24d2f903 CH	192	int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
	193	void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
	194
320ae51f JA	195	void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
320ae51f JA	196
320ae51f JA	197	void blk_mq_free_request(struct request *rq);
320ae51f JA	198	bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
6f3b0e8b CH	199
	200	enum {
	201	BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */
	202	BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */
bd166ef1	203	BLK_MQ_REQ_INTERNAL = (1 << 2), /* allocate internal/sched tag */
6f3b0e8b CH	204	};
6f3b0e8b CH	205
cd6ce148	206	struct request blk_mq_alloc_request(struct request_queue q, unsigned int op,
6f3b0e8b	207	unsigned int flags);
cd6ce148 BVA	208	struct request blk_mq_alloc_request_hctx(struct request_queue q,
cd6ce148 BVA	209	unsigned int op, unsigned int flags, unsigned int hctx_idx);
0e62f51f	210	struct request blk_mq_tag_to_rq(struct blk_mq_tags tags, unsigned int tag);
320ae51f	211
205fb5f5 BVA	212	enum {
	213	BLK_MQ_UNIQUE_TAG_BITS = 16,
	214	BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
	215	};
	216
	217	u32 blk_mq_unique_tag(struct request *rq);
	218
	219	static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
	220	{
	221	return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
	222	}
	223
	224	static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
	225	{
	226	return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
	227	}
	228
320ae51f	229
973c0191	230	int blk_mq_request_started(struct request *rq);
e2490073	231	void blk_mq_start_request(struct request *rq);
2a842aca CH	232	void blk_mq_end_request(struct request *rq, blk_status_t error);
2a842aca CH	233	void __blk_mq_end_request(struct request *rq, blk_status_t error);
320ae51f	234
2b053aca BVA	235	void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
	236	void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
	237	bool kick_requeue_list);
6fca6a61	238	void blk_mq_kick_requeue_list(struct request_queue *q);
2849450a	239	void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
08e0029a	240	void blk_mq_complete_request(struct request *rq);
30a91cb4	241
fd001443	242	bool blk_mq_queue_stopped(struct request_queue *q);
320ae51f JA	243	void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
320ae51f JA	244	void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
280d45f6	245	void blk_mq_stop_hw_queues(struct request_queue *q);
2f268556	246	void blk_mq_start_hw_queues(struct request_queue *q);
ae911c5e	247	void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
1b4a3258	248	void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
97e01209	249	void blk_mq_quiesce_queue(struct request_queue *q);
e4e73913	250	void blk_mq_unquiesce_queue(struct request_queue *q);
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);
d352ae20 BVA	263	int blk_mq_reinit_tagset(struct blk_mq_tag_set *set,
d352ae20 BVA	264	int (reinit_request)(void , struct request ));
320ae51f	265
9e5a7e22	266	int blk_mq_map_queues(struct blk_mq_tag_set *set);
868f2f0b KB	267	void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
868f2f0b KB	268
852ec809	269	void blk_mq_quiesce_queue_nowait(struct request_queue *q);
4f084b41	270
320ae51f JA	271	/*
320ae51f JA	272	* Driver command data is immediately after the request. So subtract request
2963e3f7	273	* size to get back to the original request, add request size to get the PDU.
320ae51f JA	274	*/
	275	static inline struct request blk_mq_rq_from_pdu(void pdu)
	276	{
	277	return pdu - sizeof(struct request);
	278	}
	279	static inline void blk_mq_rq_to_pdu(struct request rq)
	280	{
2963e3f7	281	return rq + 1;
320ae51f JA	282	}
320ae51f JA	283
320ae51f	284	#define queue_for_each_hw_ctx(q, hctx, i) \
0d0b7d42 JA	285	for ((i) = 0; (i) < (q)->nr_hw_queues && \
0d0b7d42 JA	286	({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
320ae51f	287
320ae51f	288	#define hctx_for_each_ctx(hctx, ctx, i) \
0d0b7d42 JA	289	for ((i) = 0; (i) < (hctx)->nr_ctx && \
0d0b7d42 JA	290	({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
320ae51f	291
320ae51f	292	#endif