[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	*dispatch_from;
	unsigned int		dispatch_busy;

	unsigned int		nr_ctx;
	struct blk_mq_ctx	**ctxs;

	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 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_S_START_ON_RUN	= 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 {
	/* 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_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_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_tagset_iter(struct blk_mq_tag_set *set, void *data,
		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
b347689f	34	struct blk_mq_ctx *dispatch_from;
d80aca31	35	unsigned int dispatch_busy;
b347689f	36
8d354f13	37	unsigned int nr_ctx;
d80aca31	38	struct blk_mq_ctx **ctxs;
4bb659b1	39
eb619fdb	40	wait_queue_entry_t dispatch_wait;
8537b120	41	atomic_t wait_index;
320ae51f	42
320ae51f	43	struct blk_mq_tags *tags;
bd166ef1	44	struct blk_mq_tags *sched_tags;
320ae51f JA	45
	46	unsigned long queued;
	47	unsigned long run;
8d354f13	48	#define BLK_MQ_MAX_DISPATCH_ORDER 7
320ae51f JA	49	unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
320ae51f JA	50
320ae51f	51	unsigned int numa_node;
17ded320	52	unsigned int queue_num;
320ae51f	53
0d2602ca JA	54	atomic_t nr_active;
0d2602ca JA	55
9467f859	56	struct hlist_node cpuhp_dead;
320ae51f	57	struct kobject kobj;
05229bee	58
6e219353	59	unsigned long poll_considered;
05229bee JA	60	unsigned long poll_invoked;
05229bee JA	61	unsigned long poll_success;
9c1051aa OS	62
	63	#ifdef CONFIG_BLK_DEBUG_FS
	64	struct dentry *debugfs_dir;
d332ce09	65	struct dentry *sched_debugfs_dir;
9c1051aa	66	#endif
07319678 BVA	67
	68	/* Must be the last member - see also blk_mq_hw_ctx_size(). */
	69	struct srcu_struct queue_rq_srcu[0];
320ae51f JA	70	};
320ae51f JA	71
24d2f903	72	struct blk_mq_tag_set {
bdd17e75	73	unsigned int *mq_map;
f8a5b122	74	const struct blk_mq_ops *ops;
320ae51f	75	unsigned int nr_hw_queues;
e3a2b3f9	76	unsigned int queue_depth; /* max hw supported */
320ae51f JA	77	unsigned int reserved_tags;
	78	unsigned int cmd_size; /* per-request extra data */
	79	int numa_node;
	80	unsigned int timeout;
	81	unsigned int flags; /* BLK_MQ_F_* */
24d2f903 CH	82	void *driver_data;
	83
	84	struct blk_mq_tags **tags;
0d2602ca JA	85
	86	struct mutex tag_list_lock;
	87	struct list_head tag_list;
320ae51f JA	88	};
320ae51f JA	89
74c45052 JA	90	struct blk_mq_queue_data {
74c45052 JA	91	struct request *rq;
74c45052 JA	92	bool last;
	93	};
	94
fc17b653 CH	95	typedef blk_status_t (queue_rq_fn)(struct blk_mq_hw_ctx *,
fc17b653 CH	96	const struct blk_mq_queue_data *);
88022d72	97	typedef bool (get_budget_fn)(struct blk_mq_hw_ctx *);
de148297	98	typedef void (put_budget_fn)(struct blk_mq_hw_ctx *);
0152fb6b	99	typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
320ae51f JA	100	typedef int (init_hctx_fn)(struct blk_mq_hw_ctx , void , unsigned int);
320ae51f JA	101	typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
d6296d39	102	typedef int (init_request_fn)(struct blk_mq_tag_set set, struct request ,
24d2f903	103	unsigned int, unsigned int);
d6296d39	104	typedef void (exit_request_fn)(struct blk_mq_tag_set set, struct request ,
24d2f903	105	unsigned int);
320ae51f	106
81481eb4 CH	107	typedef void (busy_iter_fn)(struct blk_mq_hw_ctx , struct request , void *,
81481eb4 CH	108	bool);
f26cdc85	109	typedef void (busy_tag_iter_fn)(struct request , void , bool);
05229bee	110	typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
da695ba2	111	typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
05229bee	112
81481eb4	113
320ae51f JA	114	struct blk_mq_ops {
	115	/*
	116	* Queue request
	117	*/
	118	queue_rq_fn *queue_rq;
	119
de148297 ML	120	/*
	121	* Reserve budget before queue request, once .queue_rq is
	122	* run, it is driver's responsibility to release the
	123	* reserved budget. Also we have to handle failure case
	124	* of .get_budget for avoiding I/O deadlock.
	125	*/
	126	get_budget_fn *get_budget;
	127	put_budget_fn *put_budget;
	128
320ae51f JA	129	/*
	130	* Called on request timeout
	131	*/
0152fb6b	132	timeout_fn *timeout;
320ae51f	133
05229bee JA	134	/*
	135	* Called to poll for completion of a specific tag.
	136	*/
	137	poll_fn *poll;
	138
30a91cb4 CH	139	softirq_done_fn *complete;
30a91cb4 CH	140
320ae51f JA	141	/*
	142	* Called when the block layer side of a hardware queue has been
	143	* set up, allowing the driver to allocate/init matching structures.
	144	* Ditto for exit/teardown.
	145	*/
	146	init_hctx_fn *init_hctx;
	147	exit_hctx_fn *exit_hctx;
e9b267d9 CH	148
	149	/*
	150	* Called for every command allocated by the block layer to allow
	151	* the driver to set up driver specific data.
f70ced09 ML	152	*
	153	* Tag greater than or equal to queue_depth is for setting up
	154	* flush request.
	155	*
e9b267d9 CH	156	* Ditto for exit/teardown.
	157	*/
	158	init_request_fn *init_request;
	159	exit_request_fn *exit_request;
d280bab3 BVA	160	/* Called from inside blk_get_request() */
d280bab3 BVA	161	void (initialize_rq_fn)(struct request rq);
da695ba2 CH	162
da695ba2 CH	163	map_queues_fn *map_queues;
2836ee4b BVA	164
	165	#ifdef CONFIG_BLK_DEBUG_FS
	166	/*
	167	* Used by the debugfs implementation to show driver-specific
	168	* information about a request.
	169	*/
	170	void (show_rq)(struct seq_file m, struct request *rq);
	171	#endif
320ae51f JA	172	};
	173
	174	enum {
320ae51f	175	BLK_MQ_F_SHOULD_MERGE = 1 << 0,
8a58d1f1 JA	176	BLK_MQ_F_TAG_SHARED = 1 << 1,
8a58d1f1 JA	177	BLK_MQ_F_SG_MERGE = 1 << 2,
1b792f2f	178	BLK_MQ_F_BLOCKING = 1 << 5,
d3484991	179	BLK_MQ_F_NO_SCHED = 1 << 6,
24391c0d SL	180	BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
24391c0d SL	181	BLK_MQ_F_ALLOC_POLICY_BITS = 1,
320ae51f	182
5d12f905	183	BLK_MQ_S_STOPPED = 0,
0d2602ca	184	BLK_MQ_S_TAG_ACTIVE = 1,
bd166ef1	185	BLK_MQ_S_SCHED_RESTART = 2,
eb619fdb	186	BLK_MQ_S_START_ON_RUN = 3,
320ae51f	187
a4391c64	188	BLK_MQ_MAX_DEPTH = 10240,
506e931f JA	189
506e931f JA	190	BLK_MQ_CPU_WORK_BATCH = 8,
320ae51f	191	};
24391c0d SL	192	#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
	193	((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
	194	((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
	195	#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
	196	((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
	197	<< BLK_MQ_F_ALLOC_POLICY_START_BIT)
320ae51f	198
24d2f903	199	struct request_queue blk_mq_init_queue(struct blk_mq_tag_set );
b62c21b7 MS	200	struct request_queue blk_mq_init_allocated_queue(struct blk_mq_tag_set set,
b62c21b7 MS	201	struct request_queue *q);
b21d5b30 MB	202	int blk_mq_register_dev(struct device , struct request_queue );
b21d5b30 MB	203	void blk_mq_unregister_dev(struct device , struct request_queue );
320ae51f	204
24d2f903 CH	205	int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
	206	void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
	207
320ae51f JA	208	void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
320ae51f JA	209
320ae51f JA	210	void blk_mq_free_request(struct request *rq);
320ae51f JA	211	bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
6f3b0e8b CH	212
6f3b0e8b CH	213	enum {
9a95e4ef BVA	214	/* return when out of requests */
	215	BLK_MQ_REQ_NOWAIT = (__force blk_mq_req_flags_t)(1 << 0),
	216	/* allocate from reserved pool */
	217	BLK_MQ_REQ_RESERVED = (__force blk_mq_req_flags_t)(1 << 1),
	218	/* allocate internal/sched tag */
	219	BLK_MQ_REQ_INTERNAL = (__force blk_mq_req_flags_t)(1 << 2),
	220	/* set RQF_PREEMPT */
	221	BLK_MQ_REQ_PREEMPT = (__force blk_mq_req_flags_t)(1 << 3),
6f3b0e8b CH	222	};
6f3b0e8b CH	223
cd6ce148	224	struct request blk_mq_alloc_request(struct request_queue q, unsigned int op,
9a95e4ef	225	blk_mq_req_flags_t flags);
cd6ce148	226	struct request blk_mq_alloc_request_hctx(struct request_queue q,
9a95e4ef BVA	227	unsigned int op, blk_mq_req_flags_t flags,
9a95e4ef BVA	228	unsigned int hctx_idx);
0e62f51f	229	struct request blk_mq_tag_to_rq(struct blk_mq_tags tags, unsigned int tag);
320ae51f	230
205fb5f5 BVA	231	enum {
	232	BLK_MQ_UNIQUE_TAG_BITS = 16,
	233	BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
	234	};
	235
	236	u32 blk_mq_unique_tag(struct request *rq);
	237
	238	static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
	239	{
	240	return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
	241	}
	242
	243	static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
	244	{
	245	return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
	246	}
	247
320ae51f	248
973c0191	249	int blk_mq_request_started(struct request *rq);
e2490073	250	void blk_mq_start_request(struct request *rq);
2a842aca CH	251	void blk_mq_end_request(struct request *rq, blk_status_t error);
2a842aca CH	252	void __blk_mq_end_request(struct request *rq, blk_status_t error);
320ae51f	253
2b053aca BVA	254	void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
	255	void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
	256	bool kick_requeue_list);
6fca6a61	257	void blk_mq_kick_requeue_list(struct request_queue *q);
2849450a	258	void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
08e0029a	259	void blk_mq_complete_request(struct request *rq);
30a91cb4	260
fd001443	261	bool blk_mq_queue_stopped(struct request_queue *q);
320ae51f JA	262	void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
320ae51f JA	263	void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
280d45f6	264	void blk_mq_stop_hw_queues(struct request_queue *q);
2f268556	265	void blk_mq_start_hw_queues(struct request_queue *q);
ae911c5e	266	void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
1b4a3258	267	void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
97e01209	268	void blk_mq_quiesce_queue(struct request_queue *q);
e4e73913	269	void blk_mq_unquiesce_queue(struct request_queue *q);
7587a5ae	270	void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
79f720a7	271	bool blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
b94ec296	272	void blk_mq_run_hw_queues(struct request_queue *q, bool async);
70f4db63	273	void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
e0489487 SG	274	void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
e0489487 SG	275	busy_tag_iter_fn fn, void priv);
c761d96b	276	void blk_mq_freeze_queue(struct request_queue *q);
b4c6a028	277	void blk_mq_unfreeze_queue(struct request_queue *q);
1671d522	278	void blk_freeze_queue_start(struct request_queue *q);
6bae363e	279	void blk_mq_freeze_queue_wait(struct request_queue *q);
f91328c4 KB	280	int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
f91328c4 KB	281	unsigned long timeout);
149e10f8 SG	282	int blk_mq_tagset_iter(struct blk_mq_tag_set set, void data,
149e10f8 SG	283	int (reinit_request)(void , struct request ));
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