[thirdparty/kernel/stable.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;
	unsigned int		dispatch_busy;

	unsigned short		type;
	unsigned short		nr_ctx;
	struct blk_mq_ctx	**ctxs;

	spinlock_t		dispatch_wait_lock;
	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	srcu[0];
};

struct blk_mq_queue_map {
	unsigned int *mq_map;
	unsigned int nr_queues;
	unsigned int queue_offset;
};

enum hctx_type {
	HCTX_TYPE_DEFAULT,	/* all I/O not otherwise accounted for */
	HCTX_TYPE_READ,		/* just for READ I/O */
	HCTX_TYPE_POLL,		/* polled I/O of any kind */

	HCTX_MAX_TYPES,
};

struct blk_mq_tag_set {
	/*
	 * map[] holds ctx -> hctx mappings, one map exists for each type
	 * that the driver wishes to support. There are no restrictions
	 * on maps being of the same size, and it's perfectly legal to
	 * share maps between types.
	 */
	struct blk_mq_queue_map	map[HCTX_MAX_TYPES];
	unsigned int		nr_maps;	/* nr entries in map[] */
	const struct blk_mq_ops	*ops;
	unsigned int		nr_hw_queues;	/* nr hw queues across maps */
	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 void (commit_rqs_fn)(struct blk_mq_hw_ctx *);
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 bool (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
		bool);
typedef bool (busy_tag_iter_fn)(struct request *, void *, bool);
typedef int (poll_fn)(struct blk_mq_hw_ctx *);
typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
typedef bool (busy_fn)(struct request_queue *);
typedef void (complete_fn)(struct request *);


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

	/*
	 * If a driver uses bd->last to judge when to submit requests to
	 * hardware, it must define this function. In case of errors that
	 * make us stop issuing further requests, this hook serves the
	 * purpose of kicking the hardware (which the last request otherwise
	 * would have done).
	 */
	commit_rqs_fn		*commit_rqs;

	/*
	 * 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;

	complete_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);

	/*
	 * If set, returns whether or not this queue currently is busy
	 */
	busy_fn			*busy;

	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_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);
struct request_queue *blk_mq_init_sq_queue(struct blk_mq_tag_set *set,
						const struct blk_mq_ops *ops,
						unsigned int queue_depth,
						unsigned int set_flags);
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 *);

bool blk_mq_queue_inflight(struct request_queue *q);

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_kick_requeue_list(struct request_queue *q);
void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
bool blk_mq_complete_request(struct request *rq);
void blk_mq_complete_request_sync(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_queue_map *qmap);
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);

unsigned int blk_mq_rq_cpu(struct request *rq);

/*
 * 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)++)

static inline blk_qc_t request_to_qc_t(struct blk_mq_hw_ctx *hctx,
		struct request *rq)
{
	if (rq->tag != -1)
		return rq->tag | (hctx->queue_num << BLK_QC_T_SHIFT);

	return rq->internal_tag | (hctx->queue_num << BLK_QC_T_SHIFT) |
			BLK_QC_T_INTERNAL;
}

#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	37	struct blk_mq_ctx *dispatch_from;
6e768717	38	unsigned int dispatch_busy;
b347689f	39
f31967f0 JA	40	unsigned short type;
f31967f0 JA	41	unsigned short nr_ctx;
6e768717	42	struct blk_mq_ctx **ctxs;
4bb659b1	43
5815839b	44	spinlock_t dispatch_wait_lock;
eb619fdb	45	wait_queue_entry_t dispatch_wait;
8537b120	46	atomic_t wait_index;
320ae51f	47
320ae51f	48	struct blk_mq_tags *tags;
bd166ef1	49	struct blk_mq_tags *sched_tags;
320ae51f JA	50
	51	unsigned long queued;
	52	unsigned long run;
8d354f13	53	#define BLK_MQ_MAX_DISPATCH_ORDER 7
320ae51f JA	54	unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
320ae51f JA	55
320ae51f	56	unsigned int numa_node;
17ded320	57	unsigned int queue_num;
320ae51f	58
0d2602ca JA	59	atomic_t nr_active;
0d2602ca JA	60
9467f859	61	struct hlist_node cpuhp_dead;
320ae51f	62	struct kobject kobj;
05229bee	63
6e219353	64	unsigned long poll_considered;
05229bee JA	65	unsigned long poll_invoked;
05229bee JA	66	unsigned long poll_success;
9c1051aa OS	67
	68	#ifdef CONFIG_BLK_DEBUG_FS
	69	struct dentry *debugfs_dir;
d332ce09	70	struct dentry *sched_debugfs_dir;
9c1051aa	71	#endif
07319678 BVA	72
07319678 BVA	73	/* Must be the last member - see also blk_mq_hw_ctx_size(). */
05707b64	74	struct srcu_struct srcu[0];
320ae51f JA	75	};
320ae51f JA	76
ed76e329 JA	77	struct blk_mq_queue_map {
	78	unsigned int *mq_map;
	79	unsigned int nr_queues;
843477d4	80	unsigned int queue_offset;
ed76e329 JA	81	};
ed76e329 JA	82
e20ba6e1 CH	83	enum hctx_type {
	84	HCTX_TYPE_DEFAULT, /* all I/O not otherwise accounted for */
	85	HCTX_TYPE_READ, /* just for READ I/O */
	86	HCTX_TYPE_POLL, /* polled I/O of any kind */
	87
	88	HCTX_MAX_TYPES,
ed76e329 JA	89	};
ed76e329 JA	90
24d2f903	91	struct blk_mq_tag_set {
b3c661b1 JA	92	/*
	93	* map[] holds ctx -> hctx mappings, one map exists for each type
	94	* that the driver wishes to support. There are no restrictions
	95	* on maps being of the same size, and it's perfectly legal to
	96	* share maps between types.
	97	*/
ed76e329	98	struct blk_mq_queue_map map[HCTX_MAX_TYPES];
b3c661b1	99	unsigned int nr_maps; /* nr entries in map[] */
f8a5b122	100	const struct blk_mq_ops *ops;
ed76e329	101	unsigned int nr_hw_queues; /* nr hw queues across maps */
e3a2b3f9	102	unsigned int queue_depth; /* max hw supported */
320ae51f JA	103	unsigned int reserved_tags;
	104	unsigned int cmd_size; /* per-request extra data */
	105	int numa_node;
	106	unsigned int timeout;
	107	unsigned int flags; /* BLK_MQ_F_* */
24d2f903 CH	108	void *driver_data;
	109
	110	struct blk_mq_tags **tags;
0d2602ca JA	111
	112	struct mutex tag_list_lock;
	113	struct list_head tag_list;
320ae51f JA	114	};
320ae51f JA	115
74c45052 JA	116	struct blk_mq_queue_data {
74c45052 JA	117	struct request *rq;
74c45052 JA	118	bool last;
	119	};
	120
fc17b653 CH	121	typedef blk_status_t (queue_rq_fn)(struct blk_mq_hw_ctx *,
fc17b653 CH	122	const struct blk_mq_queue_data *);
d666ba98	123	typedef void (commit_rqs_fn)(struct blk_mq_hw_ctx *);
88022d72	124	typedef bool (get_budget_fn)(struct blk_mq_hw_ctx *);
de148297	125	typedef void (put_budget_fn)(struct blk_mq_hw_ctx *);
0152fb6b	126	typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
320ae51f JA	127	typedef int (init_hctx_fn)(struct blk_mq_hw_ctx , void , unsigned int);
320ae51f JA	128	typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
d6296d39	129	typedef int (init_request_fn)(struct blk_mq_tag_set set, struct request ,
24d2f903	130	unsigned int, unsigned int);
d6296d39	131	typedef void (exit_request_fn)(struct blk_mq_tag_set set, struct request ,
24d2f903	132	unsigned int);
320ae51f	133
7baa8572	134	typedef bool (busy_iter_fn)(struct blk_mq_hw_ctx , struct request , void *,
81481eb4	135	bool);
7baa8572	136	typedef bool (busy_tag_iter_fn)(struct request , void , bool);
9743139c	137	typedef int (poll_fn)(struct blk_mq_hw_ctx *);
da695ba2	138	typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
9ba20527	139	typedef bool (busy_fn)(struct request_queue *);
c7bb9ad1	140	typedef void (complete_fn)(struct request *);
05229bee	141
81481eb4	142
320ae51f JA	143	struct blk_mq_ops {
	144	/*
	145	* Queue request
	146	*/
	147	queue_rq_fn *queue_rq;
	148
d666ba98 JA	149	/*
	150	* If a driver uses bd->last to judge when to submit requests to
	151	* hardware, it must define this function. In case of errors that
	152	* make us stop issuing further requests, this hook serves the
	153	* purpose of kicking the hardware (which the last request otherwise
	154	* would have done).
	155	*/
	156	commit_rqs_fn *commit_rqs;
	157
de148297 ML	158	/*
	159	* Reserve budget before queue request, once .queue_rq is
	160	* run, it is driver's responsibility to release the
	161	* reserved budget. Also we have to handle failure case
	162	* of .get_budget for avoiding I/O deadlock.
	163	*/
	164	get_budget_fn *get_budget;
	165	put_budget_fn *put_budget;
	166
320ae51f JA	167	/*
	168	* Called on request timeout
	169	*/
0152fb6b	170	timeout_fn *timeout;
320ae51f	171
05229bee JA	172	/*
	173	* Called to poll for completion of a specific tag.
	174	*/
	175	poll_fn *poll;
	176
c7bb9ad1	177	complete_fn *complete;
30a91cb4	178
320ae51f JA	179	/*
	180	* Called when the block layer side of a hardware queue has been
	181	* set up, allowing the driver to allocate/init matching structures.
	182	* Ditto for exit/teardown.
	183	*/
	184	init_hctx_fn *init_hctx;
	185	exit_hctx_fn *exit_hctx;
e9b267d9 CH	186
	187	/*
	188	* Called for every command allocated by the block layer to allow
	189	* the driver to set up driver specific data.
f70ced09 ML	190	*
	191	* Tag greater than or equal to queue_depth is for setting up
	192	* flush request.
	193	*
e9b267d9 CH	194	* Ditto for exit/teardown.
	195	*/
	196	init_request_fn *init_request;
	197	exit_request_fn *exit_request;
d280bab3 BVA	198	/* Called from inside blk_get_request() */
d280bab3 BVA	199	void (initialize_rq_fn)(struct request rq);
da695ba2	200
9ba20527 JA	201	/*
	202	* If set, returns whether or not this queue currently is busy
	203	*/
	204	busy_fn *busy;
	205
da695ba2	206	map_queues_fn *map_queues;
2836ee4b BVA	207
	208	#ifdef CONFIG_BLK_DEBUG_FS
	209	/*
	210	* Used by the debugfs implementation to show driver-specific
	211	* information about a request.
	212	*/
	213	void (show_rq)(struct seq_file m, struct request *rq);
	214	#endif
320ae51f JA	215	};
	216
	217	enum {
320ae51f	218	BLK_MQ_F_SHOULD_MERGE = 1 << 0,
8a58d1f1	219	BLK_MQ_F_TAG_SHARED = 1 << 1,
1b792f2f	220	BLK_MQ_F_BLOCKING = 1 << 5,
d3484991	221	BLK_MQ_F_NO_SCHED = 1 << 6,
24391c0d SL	222	BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
24391c0d SL	223	BLK_MQ_F_ALLOC_POLICY_BITS = 1,
320ae51f	224
5d12f905	225	BLK_MQ_S_STOPPED = 0,
0d2602ca	226	BLK_MQ_S_TAG_ACTIVE = 1,
bd166ef1	227	BLK_MQ_S_SCHED_RESTART = 2,
320ae51f	228
a4391c64	229	BLK_MQ_MAX_DEPTH = 10240,
506e931f JA	230
506e931f JA	231	BLK_MQ_CPU_WORK_BATCH = 8,
320ae51f	232	};
24391c0d SL	233	#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
	234	((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
	235	((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
	236	#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
	237	((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
	238	<< BLK_MQ_F_ALLOC_POLICY_START_BIT)
320ae51f	239
24d2f903	240	struct request_queue blk_mq_init_queue(struct blk_mq_tag_set );
b62c21b7 MS	241	struct request_queue blk_mq_init_allocated_queue(struct blk_mq_tag_set set,
b62c21b7 MS	242	struct request_queue *q);
9316a9ed JA	243	struct request_queue blk_mq_init_sq_queue(struct blk_mq_tag_set set,
	244	const struct blk_mq_ops *ops,
	245	unsigned int queue_depth,
	246	unsigned int set_flags);
b21d5b30 MB	247	int blk_mq_register_dev(struct device , struct request_queue );
b21d5b30 MB	248	void blk_mq_unregister_dev(struct device , struct request_queue );
320ae51f	249
24d2f903 CH	250	int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
	251	void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
	252
320ae51f JA	253	void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
320ae51f JA	254
320ae51f JA	255	void blk_mq_free_request(struct request *rq);
320ae51f JA	256	bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
6f3b0e8b	257
3c94d83c	258	bool blk_mq_queue_inflight(struct request_queue *q);
ae879912	259
6f3b0e8b	260	enum {
9a95e4ef BVA	261	/* return when out of requests */
	262	BLK_MQ_REQ_NOWAIT = (__force blk_mq_req_flags_t)(1 << 0),
	263	/* allocate from reserved pool */
	264	BLK_MQ_REQ_RESERVED = (__force blk_mq_req_flags_t)(1 << 1),
	265	/* allocate internal/sched tag */
	266	BLK_MQ_REQ_INTERNAL = (__force blk_mq_req_flags_t)(1 << 2),
	267	/* set RQF_PREEMPT */
	268	BLK_MQ_REQ_PREEMPT = (__force blk_mq_req_flags_t)(1 << 3),
6f3b0e8b CH	269	};
6f3b0e8b CH	270
cd6ce148	271	struct request blk_mq_alloc_request(struct request_queue q, unsigned int op,
9a95e4ef	272	blk_mq_req_flags_t flags);
cd6ce148	273	struct request blk_mq_alloc_request_hctx(struct request_queue q,
9a95e4ef BVA	274	unsigned int op, blk_mq_req_flags_t flags,
9a95e4ef BVA	275	unsigned int hctx_idx);
0e62f51f	276	struct request blk_mq_tag_to_rq(struct blk_mq_tags tags, unsigned int tag);
320ae51f	277
205fb5f5 BVA	278	enum {
	279	BLK_MQ_UNIQUE_TAG_BITS = 16,
	280	BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
	281	};
	282
	283	u32 blk_mq_unique_tag(struct request *rq);
	284
	285	static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
	286	{
	287	return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
	288	}
	289
	290	static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
	291	{
	292	return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
	293	}
	294
320ae51f	295
973c0191	296	int blk_mq_request_started(struct request *rq);
e2490073	297	void blk_mq_start_request(struct request *rq);
2a842aca CH	298	void blk_mq_end_request(struct request *rq, blk_status_t error);
2a842aca CH	299	void __blk_mq_end_request(struct request *rq, blk_status_t error);
320ae51f	300
2b053aca	301	void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
6fca6a61	302	void blk_mq_kick_requeue_list(struct request_queue *q);
2849450a	303	void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
16c15eb1	304	bool blk_mq_complete_request(struct request *rq);
1b8f21b7	305	void blk_mq_complete_request_sync(struct request *rq);
9c558734 JA	306	bool blk_mq_bio_list_merge(struct request_queue q, struct list_head list,
9c558734 JA	307	struct bio *bio);
fd001443	308	bool blk_mq_queue_stopped(struct request_queue *q);
320ae51f JA	309	void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
320ae51f JA	310	void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
280d45f6	311	void blk_mq_stop_hw_queues(struct request_queue *q);
2f268556	312	void blk_mq_start_hw_queues(struct request_queue *q);
ae911c5e	313	void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
1b4a3258	314	void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
97e01209	315	void blk_mq_quiesce_queue(struct request_queue *q);
e4e73913	316	void blk_mq_unquiesce_queue(struct request_queue *q);
7587a5ae	317	void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
79f720a7	318	bool blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
b94ec296	319	void blk_mq_run_hw_queues(struct request_queue *q, bool async);
e0489487 SG	320	void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
e0489487 SG	321	busy_tag_iter_fn fn, void priv);
c761d96b	322	void blk_mq_freeze_queue(struct request_queue *q);
b4c6a028	323	void blk_mq_unfreeze_queue(struct request_queue *q);
1671d522	324	void blk_freeze_queue_start(struct request_queue *q);
6bae363e	325	void blk_mq_freeze_queue_wait(struct request_queue *q);
f91328c4 KB	326	int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
f91328c4 KB	327	unsigned long timeout);
320ae51f	328
ed76e329	329	int blk_mq_map_queues(struct blk_mq_queue_map *qmap);
868f2f0b KB	330	void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
868f2f0b KB	331
852ec809	332	void blk_mq_quiesce_queue_nowait(struct request_queue *q);
4f084b41	333
9cf2bab6 JA	334	unsigned int blk_mq_rq_cpu(struct request *rq);
9cf2bab6 JA	335
320ae51f JA	336	/*
320ae51f JA	337	* Driver command data is immediately after the request. So subtract request
2963e3f7	338	* size to get back to the original request, add request size to get the PDU.
320ae51f JA	339	*/
	340	static inline struct request blk_mq_rq_from_pdu(void pdu)
	341	{
	342	return pdu - sizeof(struct request);
	343	}
	344	static inline void blk_mq_rq_to_pdu(struct request rq)
	345	{
2963e3f7	346	return rq + 1;
320ae51f JA	347	}
320ae51f JA	348
320ae51f	349	#define queue_for_each_hw_ctx(q, hctx, i) \
0d0b7d42 JA	350	for ((i) = 0; (i) < (q)->nr_hw_queues && \
0d0b7d42 JA	351	({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
320ae51f	352
320ae51f	353	#define hctx_for_each_ctx(hctx, ctx, i) \
0d0b7d42 JA	354	for ((i) = 0; (i) < (hctx)->nr_ctx && \
0d0b7d42 JA	355	({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
320ae51f	356
7b7ab780 SG	357	static inline blk_qc_t request_to_qc_t(struct blk_mq_hw_ctx *hctx,
	358	struct request *rq)
	359	{
	360	if (rq->tag != -1)
	361	return rq->tag \| (hctx->queue_num << BLK_QC_T_SHIFT);
	362
	363	return rq->internal_tag \| (hctx->queue_num << BLK_QC_T_SHIFT) \|
	364	BLK_QC_T_INTERNAL;
	365	}
	366
320ae51f	367	#endif