[mirror_ubuntu-jammy-kernel.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 work_struct	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 delayed_work	delayed_run_work;
	struct delayed_work	delay_work;

	struct hlist_node	cpuhp_dead;
	struct kobject		kobj;

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

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)(void *, struct request *, unsigned int,
		unsigned int, unsigned int);
typedef void (exit_request_fn)(void *, struct request *, unsigned int,
		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_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
27489a3c	18	struct work_struct 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
7587a5ae	54	struct delayed_work delayed_run_work;
8d354f13 JA	55	struct delayed_work delay_work;
8d354f13 JA	56
9467f859	57	struct hlist_node cpuhp_dead;
320ae51f	58	struct kobject kobj;
05229bee	59
6e219353	60	unsigned long poll_considered;
05229bee JA	61	unsigned long poll_invoked;
05229bee JA	62	unsigned long poll_success;
320ae51f JA	63	};
320ae51f JA	64
24d2f903	65	struct blk_mq_tag_set {
bdd17e75	66	unsigned int *mq_map;
f8a5b122	67	const struct blk_mq_ops *ops;
320ae51f	68	unsigned int nr_hw_queues;
e3a2b3f9	69	unsigned int queue_depth; /* max hw supported */
320ae51f JA	70	unsigned int reserved_tags;
	71	unsigned int cmd_size; /* per-request extra data */
	72	int numa_node;
	73	unsigned int timeout;
	74	unsigned int flags; /* BLK_MQ_F_* */
24d2f903 CH	75	void *driver_data;
	76
	77	struct blk_mq_tags **tags;
0d2602ca JA	78
	79	struct mutex tag_list_lock;
	80	struct list_head tag_list;
320ae51f JA	81	};
320ae51f JA	82
74c45052 JA	83	struct blk_mq_queue_data {
74c45052 JA	84	struct request *rq;
74c45052 JA	85	bool last;
	86	};
	87
	88	typedef int (queue_rq_fn)(struct blk_mq_hw_ctx , const struct blk_mq_queue_data );
0152fb6b	89	typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
320ae51f JA	90	typedef int (init_hctx_fn)(struct blk_mq_hw_ctx , void , unsigned int);
320ae51f JA	91	typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
24d2f903 CH	92	typedef int (init_request_fn)(void , struct request , unsigned int,
	93	unsigned int, unsigned int);
	94	typedef void (exit_request_fn)(void , struct request , unsigned int,
	95	unsigned int);
486cf989	96	typedef int (reinit_request_fn)(void , struct request );
320ae51f	97
81481eb4 CH	98	typedef void (busy_iter_fn)(struct blk_mq_hw_ctx , struct request , void *,
81481eb4 CH	99	bool);
f26cdc85	100	typedef void (busy_tag_iter_fn)(struct request , void , bool);
05229bee	101	typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
da695ba2	102	typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
05229bee	103
81481eb4	104
320ae51f JA	105	struct blk_mq_ops {
	106	/*
	107	* Queue request
	108	*/
	109	queue_rq_fn *queue_rq;
	110
320ae51f JA	111	/*
	112	* Called on request timeout
	113	*/
0152fb6b	114	timeout_fn *timeout;
320ae51f	115
05229bee JA	116	/*
	117	* Called to poll for completion of a specific tag.
	118	*/
	119	poll_fn *poll;
	120
30a91cb4 CH	121	softirq_done_fn *complete;
30a91cb4 CH	122
320ae51f JA	123	/*
	124	* Called when the block layer side of a hardware queue has been
	125	* set up, allowing the driver to allocate/init matching structures.
	126	* Ditto for exit/teardown.
	127	*/
	128	init_hctx_fn *init_hctx;
	129	exit_hctx_fn *exit_hctx;
e9b267d9 CH	130
	131	/*
	132	* Called for every command allocated by the block layer to allow
	133	* the driver to set up driver specific data.
f70ced09 ML	134	*
	135	* Tag greater than or equal to queue_depth is for setting up
	136	* flush request.
	137	*
e9b267d9 CH	138	* Ditto for exit/teardown.
	139	*/
	140	init_request_fn *init_request;
	141	exit_request_fn *exit_request;
486cf989	142	reinit_request_fn *reinit_request;
da695ba2 CH	143
da695ba2 CH	144	map_queues_fn *map_queues;
2836ee4b BVA	145
	146	#ifdef CONFIG_BLK_DEBUG_FS
	147	/*
	148	* Used by the debugfs implementation to show driver-specific
	149	* information about a request.
	150	*/
	151	void (show_rq)(struct seq_file m, struct request *rq);
	152	#endif
320ae51f JA	153	};
	154
	155	enum {
	156	BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */
	157	BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */
	158	BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */
	159
	160	BLK_MQ_F_SHOULD_MERGE = 1 << 0,
8a58d1f1 JA	161	BLK_MQ_F_TAG_SHARED = 1 << 1,
8a58d1f1 JA	162	BLK_MQ_F_SG_MERGE = 1 << 2,
1b792f2f	163	BLK_MQ_F_BLOCKING = 1 << 5,
d3484991	164	BLK_MQ_F_NO_SCHED = 1 << 6,
24391c0d SL	165	BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
24391c0d SL	166	BLK_MQ_F_ALLOC_POLICY_BITS = 1,
320ae51f	167
5d12f905	168	BLK_MQ_S_STOPPED = 0,
0d2602ca	169	BLK_MQ_S_TAG_ACTIVE = 1,
bd166ef1	170	BLK_MQ_S_SCHED_RESTART = 2,
da55f2cc	171	BLK_MQ_S_TAG_WAITING = 3,
320ae51f	172
a4391c64	173	BLK_MQ_MAX_DEPTH = 10240,
506e931f JA	174
506e931f JA	175	BLK_MQ_CPU_WORK_BATCH = 8,
320ae51f	176	};
24391c0d SL	177	#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
	178	((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
	179	((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
	180	#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
	181	((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
	182	<< BLK_MQ_F_ALLOC_POLICY_START_BIT)
320ae51f	183
24d2f903	184	struct request_queue blk_mq_init_queue(struct blk_mq_tag_set );
b62c21b7 MS	185	struct request_queue blk_mq_init_allocated_queue(struct blk_mq_tag_set set,
b62c21b7 MS	186	struct request_queue *q);
b21d5b30 MB	187	int blk_mq_register_dev(struct device , struct request_queue );
b21d5b30 MB	188	void blk_mq_unregister_dev(struct device , struct request_queue );
320ae51f	189
24d2f903 CH	190	int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
	191	void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
	192
320ae51f JA	193	void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
320ae51f JA	194
320ae51f JA	195	void blk_mq_free_request(struct request *rq);
320ae51f JA	196	bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
6f3b0e8b CH	197
	198	enum {
	199	BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */
	200	BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */
bd166ef1	201	BLK_MQ_REQ_INTERNAL = (1 << 2), /* allocate internal/sched tag */
6f3b0e8b CH	202	};
6f3b0e8b CH	203
4ce01dd1	204	struct request blk_mq_alloc_request(struct request_queue q, int rw,
6f3b0e8b	205	unsigned int flags);
1f5bd336 ML	206	struct request blk_mq_alloc_request_hctx(struct request_queue q, int op,
1f5bd336 ML	207	unsigned int flags, unsigned int hctx_idx);
0e62f51f	208	struct request blk_mq_tag_to_rq(struct blk_mq_tags tags, unsigned int tag);
320ae51f	209
205fb5f5 BVA	210	enum {
	211	BLK_MQ_UNIQUE_TAG_BITS = 16,
	212	BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
	213	};
	214
	215	u32 blk_mq_unique_tag(struct request *rq);
	216
	217	static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
	218	{
	219	return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
	220	}
	221
	222	static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
	223	{
	224	return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
	225	}
	226
320ae51f	227
973c0191	228	int blk_mq_request_started(struct request *rq);
e2490073	229	void blk_mq_start_request(struct request *rq);
c8a446ad CH	230	void blk_mq_end_request(struct request *rq, int error);
c8a446ad CH	231	void __blk_mq_end_request(struct request *rq, int error);
320ae51f	232
2b053aca BVA	233	void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
	234	void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
	235	bool kick_requeue_list);
6fca6a61	236	void blk_mq_kick_requeue_list(struct request_queue *q);
2849450a	237	void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
1885b24d	238	void blk_mq_abort_requeue_list(struct request_queue *q);
08e0029a	239	void blk_mq_complete_request(struct request *rq);
30a91cb4	240
fd001443	241	bool blk_mq_queue_stopped(struct request_queue *q);
320ae51f JA	242	void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
320ae51f JA	243	void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
280d45f6	244	void blk_mq_stop_hw_queues(struct request_queue *q);
2f268556	245	void blk_mq_start_hw_queues(struct request_queue *q);
ae911c5e	246	void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
1b4a3258	247	void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
7587a5ae	248	void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
5b727272	249	void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
b94ec296	250	void blk_mq_run_hw_queues(struct request_queue *q, bool async);
70f4db63	251	void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
e0489487 SG	252	void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
e0489487 SG	253	busy_tag_iter_fn fn, void priv);
c761d96b	254	void blk_mq_freeze_queue(struct request_queue *q);
b4c6a028	255	void blk_mq_unfreeze_queue(struct request_queue *q);
1671d522	256	void blk_freeze_queue_start(struct request_queue *q);
6bae363e	257	void blk_mq_freeze_queue_wait(struct request_queue *q);
f91328c4 KB	258	int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
f91328c4 KB	259	unsigned long timeout);
486cf989	260	int blk_mq_reinit_tagset(struct blk_mq_tag_set *set);
320ae51f	261
9e5a7e22	262	int blk_mq_map_queues(struct blk_mq_tag_set *set);
868f2f0b KB	263	void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
868f2f0b KB	264
320ae51f JA	265	/*
320ae51f JA	266	* Driver command data is immediately after the request. So subtract request
2963e3f7	267	* size to get back to the original request, add request size to get the PDU.
320ae51f JA	268	*/
	269	static inline struct request blk_mq_rq_from_pdu(void pdu)
	270	{
	271	return pdu - sizeof(struct request);
	272	}
	273	static inline void blk_mq_rq_to_pdu(struct request rq)
	274	{
2963e3f7	275	return rq + 1;
320ae51f JA	276	}
320ae51f JA	277
320ae51f	278	#define queue_for_each_hw_ctx(q, hctx, i) \
0d0b7d42 JA	279	for ((i) = 0; (i) < (q)->nr_hw_queues && \
0d0b7d42 JA	280	({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
320ae51f	281
320ae51f	282	#define hctx_for_each_ctx(hctx, ctx, i) \
0d0b7d42 JA	283	for ((i) = 0; (i) < (hctx)->nr_ctx && \
0d0b7d42 JA	284	({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
320ae51f	285
320ae51f	286	#endif