[linux-block.git] / block / blk-mq.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef INT_BLK_MQ_H
#define INT_BLK_MQ_H

#include "blk-stat.h"
#include "blk-mq-tag.h"

struct blk_mq_tag_set;

struct blk_mq_ctxs {
	struct kobject kobj;
	struct blk_mq_ctx __percpu	*queue_ctx;
};

/**
 * struct blk_mq_ctx - State for a software queue facing the submitting CPUs
 */
struct blk_mq_ctx {
	struct {
		spinlock_t		lock;
		struct list_head	rq_lists[HCTX_MAX_TYPES];
	} ____cacheline_aligned_in_smp;

	unsigned int		cpu;
	unsigned short		index_hw[HCTX_MAX_TYPES];
	struct blk_mq_hw_ctx 	*hctxs[HCTX_MAX_TYPES];

	struct request_queue	*queue;
	struct blk_mq_ctxs      *ctxs;
	struct kobject		kobj;
} ____cacheline_aligned_in_smp;

void blk_mq_submit_bio(struct bio *bio);
int blk_mq_poll(struct request_queue *q, blk_qc_t cookie, unsigned int flags);
void blk_mq_exit_queue(struct request_queue *q);
int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
void blk_mq_wake_waiters(struct request_queue *q);
bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *hctx, struct list_head *,
			     unsigned int);
void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
				bool kick_requeue_list);
void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx,
					struct blk_mq_ctx *start);
void blk_mq_put_rq_ref(struct request *rq);

/*
 * Internal helpers for allocating/freeing the request map
 */
void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
		     unsigned int hctx_idx);
void blk_mq_free_rq_map(struct blk_mq_tags *tags);
struct blk_mq_tags *blk_mq_alloc_map_and_rqs(struct blk_mq_tag_set *set,
				unsigned int hctx_idx, unsigned int depth);
void blk_mq_free_map_and_rqs(struct blk_mq_tag_set *set,
			     struct blk_mq_tags *tags,
			     unsigned int hctx_idx);
/*
 * Internal helpers for request insertion into sw queues
 */
void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
				bool at_head);
void blk_mq_request_bypass_insert(struct request *rq, bool at_head,
				  bool run_queue);
void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
				struct list_head *list);

/* Used by blk_insert_cloned_request() to issue request directly */
blk_status_t blk_mq_request_issue_directly(struct request *rq, bool last);
void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
				    struct list_head *list);

/*
 * CPU -> queue mappings
 */
extern int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int);

/*
 * blk_mq_map_queue_type() - map (hctx_type,cpu) to hardware queue
 * @q: request queue
 * @type: the hctx type index
 * @cpu: CPU
 */
static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue *q,
							  enum hctx_type type,
							  unsigned int cpu)
{
	return q->queue_hw_ctx[q->tag_set->map[type].mq_map[cpu]];
}

/*
 * blk_mq_map_queue() - map (cmd_flags,type) to hardware queue
 * @q: request queue
 * @flags: request command flags
 * @ctx: software queue cpu ctx
 */
static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
						     unsigned int flags,
						     struct blk_mq_ctx *ctx)
{
	enum hctx_type type = HCTX_TYPE_DEFAULT;

	/*
	 * The caller ensure that if REQ_POLLED, poll must be enabled.
	 */
	if (flags & REQ_POLLED)
		type = HCTX_TYPE_POLL;
	else if ((flags & REQ_OP_MASK) == REQ_OP_READ)
		type = HCTX_TYPE_READ;
	
	return ctx->hctxs[type];
}

/*
 * sysfs helpers
 */
extern void blk_mq_sysfs_init(struct request_queue *q);
extern void blk_mq_sysfs_deinit(struct request_queue *q);
extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q);
extern int blk_mq_sysfs_register(struct request_queue *q);
extern void blk_mq_sysfs_unregister(struct request_queue *q);
extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
void blk_mq_free_plug_rqs(struct blk_plug *plug);

void blk_mq_release(struct request_queue *q);

static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
					   unsigned int cpu)
{
	return per_cpu_ptr(q->queue_ctx, cpu);
}

/*
 * This assumes per-cpu software queueing queues. They could be per-node
 * as well, for instance. For now this is hardcoded as-is. Note that we don't
 * care about preemption, since we know the ctx's are persistent. This does
 * mean that we can't rely on ctx always matching the currently running CPU.
 */
static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
{
	return __blk_mq_get_ctx(q, raw_smp_processor_id());
}

struct blk_mq_alloc_data {
	/* input parameter */
	struct request_queue *q;
	blk_mq_req_flags_t flags;
	unsigned int shallow_depth;
	unsigned int cmd_flags;

	/* allocate multiple requests/tags in one go */
	unsigned int nr_tags;
	struct request **cached_rq;

	/* input & output parameter */
	struct blk_mq_ctx *ctx;
	struct blk_mq_hw_ctx *hctx;
};

static inline bool blk_mq_is_shared_tags(unsigned int flags)
{
	return flags & BLK_MQ_F_TAG_HCTX_SHARED;
}

static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
{
	if (data->q->elevator)
		return data->hctx->sched_tags;

	return data->hctx->tags;
}

static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
{
	return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
}

static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
{
	return hctx->nr_ctx && hctx->tags;
}

unsigned int blk_mq_in_flight(struct request_queue *q,
		struct block_device *part);
void blk_mq_in_flight_rw(struct request_queue *q, struct block_device *part,
		unsigned int inflight[2]);

static inline void blk_mq_put_dispatch_budget(struct request_queue *q,
					      int budget_token)
{
	if (q->mq_ops->put_budget)
		q->mq_ops->put_budget(q, budget_token);
}

static inline int blk_mq_get_dispatch_budget(struct request_queue *q)
{
	if (q->mq_ops->get_budget)
		return q->mq_ops->get_budget(q);
	return 0;
}

static inline void blk_mq_set_rq_budget_token(struct request *rq, int token)
{
	if (token < 0)
		return;

	if (rq->q->mq_ops->set_rq_budget_token)
		rq->q->mq_ops->set_rq_budget_token(rq, token);
}

static inline int blk_mq_get_rq_budget_token(struct request *rq)
{
	if (rq->q->mq_ops->get_rq_budget_token)
		return rq->q->mq_ops->get_rq_budget_token(rq);
	return -1;
}

static inline void __blk_mq_inc_active_requests(struct blk_mq_hw_ctx *hctx)
{
	if (blk_mq_is_shared_tags(hctx->flags))
		atomic_inc(&hctx->queue->nr_active_requests_shared_tags);
	else
		atomic_inc(&hctx->nr_active);
}

static inline void __blk_mq_dec_active_requests(struct blk_mq_hw_ctx *hctx)
{
	if (blk_mq_is_shared_tags(hctx->flags))
		atomic_dec(&hctx->queue->nr_active_requests_shared_tags);
	else
		atomic_dec(&hctx->nr_active);
}

static inline int __blk_mq_active_requests(struct blk_mq_hw_ctx *hctx)
{
	if (blk_mq_is_shared_tags(hctx->flags))
		return atomic_read(&hctx->queue->nr_active_requests_shared_tags);
	return atomic_read(&hctx->nr_active);
}
static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx,
					   struct request *rq)
{
	blk_mq_put_tag(hctx->tags, rq->mq_ctx, rq->tag);
	rq->tag = BLK_MQ_NO_TAG;

	if (rq->rq_flags & RQF_MQ_INFLIGHT) {
		rq->rq_flags &= ~RQF_MQ_INFLIGHT;
		__blk_mq_dec_active_requests(hctx);
	}
}

static inline void blk_mq_put_driver_tag(struct request *rq)
{
	if (rq->tag == BLK_MQ_NO_TAG || rq->internal_tag == BLK_MQ_NO_TAG)
		return;

	__blk_mq_put_driver_tag(rq->mq_hctx, rq);
}

bool blk_mq_get_driver_tag(struct request *rq);

static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap)
{
	int cpu;

	for_each_possible_cpu(cpu)
		qmap->mq_map[cpu] = 0;
}

/*
 * blk_mq_plug() - Get caller context plug
 * @q: request queue
 * @bio : the bio being submitted by the caller context
 *
 * Plugging, by design, may delay the insertion of BIOs into the elevator in
 * order to increase BIO merging opportunities. This however can cause BIO
 * insertion order to change from the order in which submit_bio() is being
 * executed in the case of multiple contexts concurrently issuing BIOs to a
 * device, even if these context are synchronized to tightly control BIO issuing
 * order. While this is not a problem with regular block devices, this ordering
 * change can cause write BIO failures with zoned block devices as these
 * require sequential write patterns to zones. Prevent this from happening by
 * ignoring the plug state of a BIO issuing context if the target request queue
 * is for a zoned block device and the BIO to plug is a write operation.
 *
 * Return current->plug if the bio can be plugged and NULL otherwise
 */
static inline struct blk_plug *blk_mq_plug(struct request_queue *q,
					   struct bio *bio)
{
	/*
	 * For regular block devices or read operations, use the context plug
	 * which may be NULL if blk_start_plug() was not executed.
	 */
	if (!blk_queue_is_zoned(q) || !op_is_write(bio_op(bio)))
		return current->plug;

	/* Zoned block device write operation case: do not plug the BIO */
	return NULL;
}

/* Free all requests on the list */
static inline void blk_mq_free_requests(struct list_head *list)
{
	while (!list_empty(list)) {
		struct request *rq = list_entry_rq(list->next);

		list_del_init(&rq->queuelist);
		blk_mq_free_request(rq);
	}
}

/*
 * For shared tag users, we track the number of currently active users
 * and attempt to provide a fair share of the tag depth for each of them.
 */
static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx,
				  struct sbitmap_queue *bt)
{
	unsigned int depth, users;

	if (!hctx || !(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
		return true;

	/*
	 * Don't try dividing an ant
	 */
	if (bt->sb.depth == 1)
		return true;

	if (blk_mq_is_shared_tags(hctx->flags)) {
		struct request_queue *q = hctx->queue;

		if (!test_bit(QUEUE_FLAG_HCTX_ACTIVE, &q->queue_flags))
			return true;
	} else {
		if (!test_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state))
			return true;
	}

	users = atomic_read(&hctx->tags->active_queues);

	if (!users)
		return true;

	/*
	 * Allow at least some tags
	 */
	depth = max((bt->sb.depth + users - 1) / users, 4U);
	return __blk_mq_active_requests(hctx) < depth;
}


#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
320ae51f JA	2	#ifndef INT_BLK_MQ_H
	3	#define INT_BLK_MQ_H
	4
cf43e6be	5	#include "blk-stat.h"
244c65a3	6	#include "blk-mq-tag.h"
cf43e6be	7
24d2f903 CH	8	struct blk_mq_tag_set;
24d2f903 CH	9
1db4909e ML	10	struct blk_mq_ctxs {
	11	struct kobject kobj;
	12	struct blk_mq_ctx __percpu *queue_ctx;
	13	};
	14
fe644072 LW	15	/**
	16	* struct blk_mq_ctx - State for a software queue facing the submitting CPUs
	17	*/
320ae51f JA	18	struct blk_mq_ctx {
	19	struct {
	20	spinlock_t lock;
c16d6b5a ML	21	struct list_head rq_lists[HCTX_MAX_TYPES];
c16d6b5a ML	22	} ____cacheline_aligned_in_smp;
320ae51f JA	23
320ae51f JA	24	unsigned int cpu;
f31967f0	25	unsigned short index_hw[HCTX_MAX_TYPES];
8ccdf4a3	26	struct blk_mq_hw_ctx *hctxs[HCTX_MAX_TYPES];
320ae51f	27
320ae51f	28	struct request_queue *queue;
1db4909e	29	struct blk_mq_ctxs *ctxs;
320ae51f	30	struct kobject kobj;
4bb659b1	31	} ____cacheline_aligned_in_smp;
320ae51f	32
3e08773c CH	33	void blk_mq_submit_bio(struct bio *bio);
3e08773c CH	34	int blk_mq_poll(struct request_queue *q, blk_qc_t cookie, unsigned int flags);
c7e2d94b	35	void blk_mq_exit_queue(struct request_queue *q);
e3a2b3f9	36	int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
aed3ea94	37	void blk_mq_wake_waiters(struct request_queue *q);
1fd40b5e ML	38	bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx hctx, struct list_head ,
1fd40b5e ML	39	unsigned int);
e6c98712 BVA	40	void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
e6c98712 BVA	41	bool kick_requeue_list);
2c3ad667	42	void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx hctx, struct list_head list);
b347689f ML	43	struct request blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx hctx,
b347689f ML	44	struct blk_mq_ctx *start);
2e315dc0	45	void blk_mq_put_rq_ref(struct request *rq);
2c3ad667 JA	46
	47	/*
	48	* Internal helpers for allocating/freeing the request map
	49	*/
cc71a6f4 JA	50	void blk_mq_free_rqs(struct blk_mq_tag_set set, struct blk_mq_tags tags,
cc71a6f4 JA	51	unsigned int hctx_idx);
e155b0c2	52	void blk_mq_free_rq_map(struct blk_mq_tags *tags);
63064be1 JG	53	struct blk_mq_tags blk_mq_alloc_map_and_rqs(struct blk_mq_tag_set set,
63064be1 JG	54	unsigned int hctx_idx, unsigned int depth);
645db34e JG	55	void blk_mq_free_map_and_rqs(struct blk_mq_tag_set *set,
	56	struct blk_mq_tags *tags,
	57	unsigned int hctx_idx);
2c3ad667 JA	58	/*
	59	* Internal helpers for request insertion into sw queues
	60	*/
	61	void __blk_mq_insert_request(struct blk_mq_hw_ctx hctx, struct request rq,
	62	bool at_head);
01e99aec ML	63	void blk_mq_request_bypass_insert(struct request *rq, bool at_head,
01e99aec ML	64	bool run_queue);
bd166ef1 JA	65	void blk_mq_insert_requests(struct blk_mq_hw_ctx hctx, struct blk_mq_ctx ctx,
bd166ef1 JA	66	struct list_head *list);
320ae51f	67
fd9c40f6 BVA	68	/* Used by blk_insert_cloned_request() to issue request directly */
fd9c40f6 BVA	69	blk_status_t blk_mq_request_issue_directly(struct request *rq, bool last);
6ce3dd6e ML	70	void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
6ce3dd6e ML	71	struct list_head *list);
396eaf21	72
320ae51f JA	73	/*
	74	* CPU -> queue mappings
	75	*/
ed76e329	76	extern int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int);
320ae51f	77
b3c661b1 JA	78	/*
	79	* blk_mq_map_queue_type() - map (hctx_type,cpu) to hardware queue
	80	* @q: request queue
e20ba6e1	81	* @type: the hctx type index
b3c661b1 JA	82	* @cpu: CPU
	83	*/
	84	static inline struct blk_mq_hw_ctx blk_mq_map_queue_type(struct request_queue q,
e20ba6e1	85	enum hctx_type type,
b3c661b1	86	unsigned int cpu)
7d7e0f90	87	{
e20ba6e1	88	return q->queue_hw_ctx[q->tag_set->map[type].mq_map[cpu]];
7d7e0f90 CH	89	}
7d7e0f90 CH	90
b3c661b1 JA	91	/*
	92	* blk_mq_map_queue() - map (cmd_flags,type) to hardware queue
	93	* @q: request queue
	94	* @flags: request command flags
d220a214	95	* @ctx: software queue cpu ctx
b3c661b1 JA	96	*/
	97	static inline struct blk_mq_hw_ctx blk_mq_map_queue(struct request_queue q,
	98	unsigned int flags,
8ccdf4a3	99	struct blk_mq_ctx *ctx)
ff2c5660	100	{
e20ba6e1 CH	101	enum hctx_type type = HCTX_TYPE_DEFAULT;
e20ba6e1 CH	102
bb94aea1	103	/*
6ce913fe	104	* The caller ensure that if REQ_POLLED, poll must be enabled.
bb94aea1	105	*/
6ce913fe	106	if (flags & REQ_POLLED)
e20ba6e1	107	type = HCTX_TYPE_POLL;
bb94aea1	108	else if ((flags & REQ_OP_MASK) == REQ_OP_READ)
e20ba6e1	109	type = HCTX_TYPE_READ;
5aceaeb2	110
8ccdf4a3	111	return ctx->hctxs[type];
ff2c5660 JA	112	}
ff2c5660 JA	113
67aec14c JA	114	/*
	115	* sysfs helpers
	116	*/
737f98cf	117	extern void blk_mq_sysfs_init(struct request_queue *q);
7ea5fe31	118	extern void blk_mq_sysfs_deinit(struct request_queue *q);
2d0364c8	119	extern int __blk_mq_register_dev(struct device dev, struct request_queue q);
67aec14c JA	120	extern int blk_mq_sysfs_register(struct request_queue *q);
67aec14c JA	121	extern void blk_mq_sysfs_unregister(struct request_queue *q);
868f2f0b	122	extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
47c122e3	123	void blk_mq_free_plug_rqs(struct blk_plug *plug);
67aec14c	124
e09aae7e ML	125	void blk_mq_release(struct request_queue *q);
e09aae7e ML	126
1aecfe48 ML	127	static inline struct blk_mq_ctx __blk_mq_get_ctx(struct request_queue q,
	128	unsigned int cpu)
	129	{
	130	return per_cpu_ptr(q->queue_ctx, cpu);
	131	}
	132
	133	/*
	134	* This assumes per-cpu software queueing queues. They could be per-node
	135	* as well, for instance. For now this is hardcoded as-is. Note that we don't
	136	* care about preemption, since we know the ctx's are persistent. This does
	137	* mean that we can't rely on ctx always matching the currently running CPU.
	138	*/
	139	static inline struct blk_mq_ctx blk_mq_get_ctx(struct request_queue q)
	140	{
c05f4220	141	return __blk_mq_get_ctx(q, raw_smp_processor_id());
1aecfe48 ML	142	}
1aecfe48 ML	143
cb96a42c ML	144	struct blk_mq_alloc_data {
	145	/* input parameter */
	146	struct request_queue *q;
9a95e4ef	147	blk_mq_req_flags_t flags;
229a9287	148	unsigned int shallow_depth;
f9afca4d	149	unsigned int cmd_flags;
cb96a42c	150
47c122e3 JA	151	/* allocate multiple requests/tags in one go */
	152	unsigned int nr_tags;
	153	struct request **cached_rq;
	154
cb96a42c ML	155	/* input & output parameter */
	156	struct blk_mq_ctx *ctx;
	157	struct blk_mq_hw_ctx *hctx;
	158	};
	159
079a2e3e	160	static inline bool blk_mq_is_shared_tags(unsigned int flags)
32bc15af JG	161	{
	162	return flags & BLK_MQ_F_TAG_HCTX_SHARED;
	163	}
	164
4941115b JA	165	static inline struct blk_mq_tags blk_mq_tags_from_data(struct blk_mq_alloc_data data)
4941115b JA	166	{
42fdc5e4	167	if (data->q->elevator)
bd166ef1 JA	168	return data->hctx->sched_tags;
bd166ef1 JA	169
4941115b JA	170	return data->hctx->tags;
	171	}
	172
5d1b25c1 BVA	173	static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
	174	{
	175	return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
	176	}
	177
19c66e59 ML	178	static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
	179	{
	180	return hctx->nr_ctx && hctx->tags;
	181	}
	182
8446fe92 CH	183	unsigned int blk_mq_in_flight(struct request_queue *q,
	184	struct block_device *part);
	185	void blk_mq_in_flight_rw(struct request_queue q, struct block_device part,
	186	unsigned int inflight[2]);
f299b7c7	187
2a5a24aa ML	188	static inline void blk_mq_put_dispatch_budget(struct request_queue *q,
2a5a24aa ML	189	int budget_token)
de148297	190	{
de148297	191	if (q->mq_ops->put_budget)
2a5a24aa	192	q->mq_ops->put_budget(q, budget_token);
de148297 ML	193	}
de148297 ML	194
2a5a24aa	195	static inline int blk_mq_get_dispatch_budget(struct request_queue *q)
de148297	196	{
de148297	197	if (q->mq_ops->get_budget)
65c76369	198	return q->mq_ops->get_budget(q);
2a5a24aa ML	199	return 0;
	200	}
	201
	202	static inline void blk_mq_set_rq_budget_token(struct request *rq, int token)
	203	{
	204	if (token < 0)
	205	return;
	206
	207	if (rq->q->mq_ops->set_rq_budget_token)
	208	rq->q->mq_ops->set_rq_budget_token(rq, token);
	209	}
	210
	211	static inline int blk_mq_get_rq_budget_token(struct request *rq)
	212	{
	213	if (rq->q->mq_ops->get_rq_budget_token)
	214	return rq->q->mq_ops->get_rq_budget_token(rq);
	215	return -1;
de148297 ML	216	}
de148297 ML	217
bccf5e26 JG	218	static inline void __blk_mq_inc_active_requests(struct blk_mq_hw_ctx *hctx)
bccf5e26 JG	219	{
079a2e3e JG	220	if (blk_mq_is_shared_tags(hctx->flags))
079a2e3e JG	221	atomic_inc(&hctx->queue->nr_active_requests_shared_tags);
bccf5e26 JG	222	else
	223	atomic_inc(&hctx->nr_active);
	224	}
	225
	226	static inline void __blk_mq_dec_active_requests(struct blk_mq_hw_ctx *hctx)
	227	{
079a2e3e JG	228	if (blk_mq_is_shared_tags(hctx->flags))
079a2e3e JG	229	atomic_dec(&hctx->queue->nr_active_requests_shared_tags);
bccf5e26 JG	230	else
	231	atomic_dec(&hctx->nr_active);
	232	}
	233
	234	static inline int __blk_mq_active_requests(struct blk_mq_hw_ctx *hctx)
	235	{
079a2e3e JG	236	if (blk_mq_is_shared_tags(hctx->flags))
079a2e3e JG	237	return atomic_read(&hctx->queue->nr_active_requests_shared_tags);
bccf5e26 JG	238	return atomic_read(&hctx->nr_active);
bccf5e26 JG	239	}
4e2f62e5 JA	240	static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx,
	241	struct request *rq)
	242	{
	243	blk_mq_put_tag(hctx->tags, rq->mq_ctx, rq->tag);
	244	rq->tag = BLK_MQ_NO_TAG;
	245
	246	if (rq->rq_flags & RQF_MQ_INFLIGHT) {
	247	rq->rq_flags &= ~RQF_MQ_INFLIGHT;
bccf5e26	248	__blk_mq_dec_active_requests(hctx);
4e2f62e5 JA	249	}
	250	}
	251
	252	static inline void blk_mq_put_driver_tag(struct request *rq)
	253	{
	254	if (rq->tag == BLK_MQ_NO_TAG \|\| rq->internal_tag == BLK_MQ_NO_TAG)
	255	return;
	256
	257	__blk_mq_put_driver_tag(rq->mq_hctx, rq);
	258	}
	259
61347154 JK	260	bool blk_mq_get_driver_tag(struct request *rq);
61347154 JK	261
ed76e329	262	static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap)
0da73d00 MI	263	{
	264	int cpu;
	265
	266	for_each_possible_cpu(cpu)
ed76e329	267	qmap->mq_map[cpu] = 0;
0da73d00 MI	268	}
0da73d00 MI	269
b49773e7 DLM	270	/*
	271	* blk_mq_plug() - Get caller context plug
	272	* @q: request queue
	273	* @bio : the bio being submitted by the caller context
	274	*
	275	* Plugging, by design, may delay the insertion of BIOs into the elevator in
	276	* order to increase BIO merging opportunities. This however can cause BIO
	277	* insertion order to change from the order in which submit_bio() is being
	278	* executed in the case of multiple contexts concurrently issuing BIOs to a
	279	* device, even if these context are synchronized to tightly control BIO issuing
	280	* order. While this is not a problem with regular block devices, this ordering
	281	* change can cause write BIO failures with zoned block devices as these
	282	* require sequential write patterns to zones. Prevent this from happening by
	283	* ignoring the plug state of a BIO issuing context if the target request queue
	284	* is for a zoned block device and the BIO to plug is a write operation.
	285	*
	286	* Return current->plug if the bio can be plugged and NULL otherwise
	287	*/
	288	static inline struct blk_plug blk_mq_plug(struct request_queue q,
	289	struct bio *bio)
	290	{
	291	/*
	292	* For regular block devices or read operations, use the context plug
	293	* which may be NULL if blk_start_plug() was not executed.
	294	*/
	295	if (!blk_queue_is_zoned(q) \|\| !op_is_write(bio_op(bio)))
	296	return current->plug;
	297
	298	/* Zoned block device write operation case: do not plug the BIO */
	299	return NULL;
	300	}
	301
fd2ef39c JK	302	/* Free all requests on the list */
	303	static inline void blk_mq_free_requests(struct list_head *list)
	304	{
	305	while (!list_empty(list)) {
	306	struct request *rq = list_entry_rq(list->next);
	307
	308	list_del_init(&rq->queuelist);
	309	blk_mq_free_request(rq);
	310	}
	311	}
	312
a0235d23 JG	313	/*
	314	* For shared tag users, we track the number of currently active users
	315	* and attempt to provide a fair share of the tag depth for each of them.
	316	*/
	317	static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx,
	318	struct sbitmap_queue *bt)
	319	{
	320	unsigned int depth, users;
	321
	322	if (!hctx \|\| !(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
	323	return true;
a0235d23 JG	324
	325	/*
	326	* Don't try dividing an ant
	327	*/
	328	if (bt->sb.depth == 1)
	329	return true;
	330
079a2e3e	331	if (blk_mq_is_shared_tags(hctx->flags)) {
f1b49fdc	332	struct request_queue *q = hctx->queue;
f1b49fdc	333
2569063c	334	if (!test_bit(QUEUE_FLAG_HCTX_ACTIVE, &q->queue_flags))
f1b49fdc	335	return true;
f1b49fdc JG	336	} else {
	337	if (!test_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state))
	338	return true;
f1b49fdc JG	339	}
f1b49fdc JG	340
e155b0c2 JG	341	users = atomic_read(&hctx->tags->active_queues);
e155b0c2 JG	342
a0235d23 JG	343	if (!users)
	344	return true;
	345
	346	/*
	347	* Allow at least some tags
	348	*/
	349	depth = max((bt->sb.depth + users - 1) / users, 4U);
bccf5e26	350	return __blk_mq_active_requests(hctx) < depth;
a0235d23 JG	351	}
	352
	353
320ae51f	354	#endif