[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 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	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;
	struct list_head *list;
	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;
};

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_DEFER_ISSUE	= 1 << 4,
	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, int error);

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_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_mq_freeze_queue_start(struct request_queue *q);
void blk_mq_freeze_queue_wait(struct request_queue *q);
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
8d354f13 JA	54	struct delayed_work delay_work;
8d354f13 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;
320ae51f JA	62	};
320ae51f JA	63
24d2f903	64	struct blk_mq_tag_set {
bdd17e75	65	unsigned int *mq_map;
f8a5b122	66	const struct blk_mq_ops *ops;
320ae51f	67	unsigned int nr_hw_queues;
e3a2b3f9	68	unsigned int queue_depth; /* max hw supported */
320ae51f JA	69	unsigned int reserved_tags;
	70	unsigned int cmd_size; /* per-request extra data */
	71	int numa_node;
	72	unsigned int timeout;
	73	unsigned int flags; /* BLK_MQ_F_* */
24d2f903 CH	74	void *driver_data;
	75
	76	struct blk_mq_tags **tags;
0d2602ca JA	77
	78	struct mutex tag_list_lock;
	79	struct list_head tag_list;
320ae51f JA	80	};
320ae51f JA	81
74c45052 JA	82	struct blk_mq_queue_data {
	83	struct request *rq;
	84	struct list_head *list;
	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;
320ae51f JA	145	};
	146
	147	enum {
	148	BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */
	149	BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */
	150	BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */
	151
	152	BLK_MQ_F_SHOULD_MERGE = 1 << 0,
8a58d1f1 JA	153	BLK_MQ_F_TAG_SHARED = 1 << 1,
8a58d1f1 JA	154	BLK_MQ_F_SG_MERGE = 1 << 2,
e167dfb5	155	BLK_MQ_F_DEFER_ISSUE = 1 << 4,
1b792f2f	156	BLK_MQ_F_BLOCKING = 1 << 5,
d3484991	157	BLK_MQ_F_NO_SCHED = 1 << 6,
24391c0d SL	158	BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
24391c0d SL	159	BLK_MQ_F_ALLOC_POLICY_BITS = 1,
320ae51f	160
5d12f905	161	BLK_MQ_S_STOPPED = 0,
0d2602ca	162	BLK_MQ_S_TAG_ACTIVE = 1,
bd166ef1	163	BLK_MQ_S_SCHED_RESTART = 2,
da55f2cc	164	BLK_MQ_S_TAG_WAITING = 3,
320ae51f	165
a4391c64	166	BLK_MQ_MAX_DEPTH = 10240,
506e931f JA	167
506e931f JA	168	BLK_MQ_CPU_WORK_BATCH = 8,
320ae51f	169	};
24391c0d SL	170	#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
	171	((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
	172	((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
	173	#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
	174	((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
	175	<< BLK_MQ_F_ALLOC_POLICY_START_BIT)
320ae51f	176
24d2f903	177	struct request_queue blk_mq_init_queue(struct blk_mq_tag_set );
b62c21b7 MS	178	struct request_queue blk_mq_init_allocated_queue(struct blk_mq_tag_set set,
b62c21b7 MS	179	struct request_queue *q);
b21d5b30 MB	180	int blk_mq_register_dev(struct device , struct request_queue );
b21d5b30 MB	181	void blk_mq_unregister_dev(struct device , struct request_queue );
320ae51f	182
24d2f903 CH	183	int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
	184	void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
	185
320ae51f JA	186	void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
320ae51f JA	187
320ae51f JA	188	void blk_mq_free_request(struct request *rq);
320ae51f JA	189	bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
6f3b0e8b CH	190
	191	enum {
	192	BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */
	193	BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */
bd166ef1	194	BLK_MQ_REQ_INTERNAL = (1 << 2), /* allocate internal/sched tag */
6f3b0e8b CH	195	};
6f3b0e8b CH	196
4ce01dd1	197	struct request blk_mq_alloc_request(struct request_queue q, int rw,
6f3b0e8b	198	unsigned int flags);
1f5bd336 ML	199	struct request blk_mq_alloc_request_hctx(struct request_queue q, int op,
1f5bd336 ML	200	unsigned int flags, unsigned int hctx_idx);
0e62f51f	201	struct request blk_mq_tag_to_rq(struct blk_mq_tags tags, unsigned int tag);
320ae51f	202
205fb5f5 BVA	203	enum {
	204	BLK_MQ_UNIQUE_TAG_BITS = 16,
	205	BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
	206	};
	207
	208	u32 blk_mq_unique_tag(struct request *rq);
	209
	210	static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
	211	{
	212	return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
	213	}
	214
	215	static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
	216	{
	217	return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
	218	}
	219
320ae51f	220
973c0191	221	int blk_mq_request_started(struct request *rq);
e2490073	222	void blk_mq_start_request(struct request *rq);
c8a446ad CH	223	void blk_mq_end_request(struct request *rq, int error);
c8a446ad CH	224	void __blk_mq_end_request(struct request *rq, int error);
320ae51f	225
2b053aca BVA	226	void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
	227	void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
	228	bool kick_requeue_list);
6fca6a61	229	void blk_mq_kick_requeue_list(struct request_queue *q);
2849450a	230	void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
1885b24d	231	void blk_mq_abort_requeue_list(struct request_queue *q);
f4829a9b	232	void blk_mq_complete_request(struct request *rq, int error);
30a91cb4	233
fd001443	234	bool blk_mq_queue_stopped(struct request_queue *q);
320ae51f JA	235	void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
320ae51f JA	236	void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
280d45f6	237	void blk_mq_stop_hw_queues(struct request_queue *q);
2f268556	238	void blk_mq_start_hw_queues(struct request_queue *q);
ae911c5e	239	void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
1b4a3258	240	void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
b94ec296	241	void blk_mq_run_hw_queues(struct request_queue *q, bool async);
70f4db63	242	void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
e0489487 SG	243	void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
e0489487 SG	244	busy_tag_iter_fn fn, void priv);
c761d96b	245	void blk_mq_freeze_queue(struct request_queue *q);
b4c6a028 KB	246	void blk_mq_unfreeze_queue(struct request_queue *q);
b4c6a028 KB	247	void blk_mq_freeze_queue_start(struct request_queue *q);
6bae363e	248	void blk_mq_freeze_queue_wait(struct request_queue *q);
486cf989	249	int blk_mq_reinit_tagset(struct blk_mq_tag_set *set);
320ae51f	250
9e5a7e22	251	int blk_mq_map_queues(struct blk_mq_tag_set *set);
868f2f0b KB	252	void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
868f2f0b KB	253
320ae51f JA	254	/*
320ae51f JA	255	* Driver command data is immediately after the request. So subtract request
2963e3f7	256	* size to get back to the original request, add request size to get the PDU.
320ae51f JA	257	*/
	258	static inline struct request blk_mq_rq_from_pdu(void pdu)
	259	{
	260	return pdu - sizeof(struct request);
	261	}
	262	static inline void blk_mq_rq_to_pdu(struct request rq)
	263	{
2963e3f7	264	return rq + 1;
320ae51f JA	265	}
320ae51f JA	266
320ae51f	267	#define queue_for_each_hw_ctx(q, hctx, i) \
0d0b7d42 JA	268	for ((i) = 0; (i) < (q)->nr_hw_queues && \
0d0b7d42 JA	269	({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
320ae51f	270
320ae51f	271	#define hctx_for_each_ctx(hctx, ctx, i) \
0d0b7d42 JA	272	for ((i) = 0; (i) < (hctx)->nr_ctx && \
0d0b7d42 JA	273	({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
320ae51f	274
320ae51f	275	#endif