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Release 4.17 block/blk-mq.h

Directory: block
/* 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_ctx - State for a software queue facing the submitting CPUs
 */

struct blk_mq_ctx {
	
struct {
		
spinlock_t		lock;
		
struct list_head	rq_list;
	
}  ____cacheline_aligned_in_smp;

	
unsigned int		cpu;
	
unsigned int		index_hw;

	/* incremented at dispatch time */
	
unsigned long		rq_dispatched[2];
	
unsigned long		rq_merged;

	/* incremented at completion time */
	
unsigned long		____cacheline_aligned_in_smp rq_completed[2];

	
struct request_queue	*queue;
	
struct kobject		kobj;

} ____cacheline_aligned_in_smp;

/*
 * Bits for request->gstate.  The lower two bits carry MQ_RQ_* state value
 * and the upper bits the generation number.
 */

enum mq_rq_state {
	
MQ_RQ_IDLE		= 0,
	
MQ_RQ_IN_FLIGHT		= 1,
	
MQ_RQ_COMPLETE		= 2,

	
MQ_RQ_STATE_BITS	= 2,
	
MQ_RQ_STATE_MASK	= (1 << MQ_RQ_STATE_BITS) - 1,
	
MQ_RQ_GEN_INC		= 1 << MQ_RQ_STATE_BITS,
};

void blk_mq_freeze_queue(struct request_queue *q);
void blk_mq_free_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 request_queue *, struct list_head *, bool);
void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx,
				bool wait);
struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx,
					struct blk_mq_ctx *start);

/*
 * 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_rq_map(struct blk_mq_tag_set *set,
					unsigned int hctx_idx,
					unsigned int nr_tags,
					unsigned int reserved_tags);
int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
		     unsigned int hctx_idx, unsigned int depth);

/*
 * 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 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);

/*
 * CPU -> queue mappings
 */
extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);


static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, int cpu) { return q->queue_hw_ctx[q->mq_map[cpu]]; }

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/* * 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_release(struct request_queue *q); /** * blk_mq_rq_state() - read the current MQ_RQ_* state of a request * @rq: target request. */
static inline int blk_mq_rq_state(struct request *rq) { return READ_ONCE(rq->gstate) & MQ_RQ_STATE_MASK; }

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/** * blk_mq_rq_update_state() - set the current MQ_RQ_* state of a request * @rq: target request. * @state: new state to set. * * Set @rq's state to @state. The caller is responsible for ensuring that * there are no other updaters. A request can transition into IN_FLIGHT * only from IDLE and doing so increments the generation number. */
static inline void blk_mq_rq_update_state(struct request *rq, enum mq_rq_state state) { u64 old_val = READ_ONCE(rq->gstate); u64 new_val = (old_val & ~MQ_RQ_STATE_MASK) | state; if (state == MQ_RQ_IN_FLIGHT) { WARN_ON_ONCE((old_val & MQ_RQ_STATE_MASK) != MQ_RQ_IDLE); new_val += MQ_RQ_GEN_INC; } /* avoid exposing interim values */ WRITE_ONCE(rq->gstate, new_val); }

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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); }

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/* * 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, get_cpu()); }

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static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx) { put_cpu(); }

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struct blk_mq_alloc_data { /* input parameter */ struct request_queue *q; blk_mq_req_flags_t flags; unsigned int shallow_depth; /* input & output parameter */ struct blk_mq_ctx *ctx; struct blk_mq_hw_ctx *hctx; };
static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data) { if (data->flags & BLK_MQ_REQ_INTERNAL) return data->hctx->sched_tags; return data->hctx->tags; }

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

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

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void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part, unsigned int inflight[2]); void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part, unsigned int inflight[2]);
static inline void blk_mq_put_dispatch_budget(struct blk_mq_hw_ctx *hctx) { struct request_queue *q = hctx->queue; if (q->mq_ops->put_budget) q->mq_ops->put_budget(hctx); }

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static inline bool blk_mq_get_dispatch_budget(struct blk_mq_hw_ctx *hctx) { struct request_queue *q = hctx->queue; if (q->mq_ops->get_budget) return q->mq_ops->get_budget(hctx); return true; }

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static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx, struct request *rq) { blk_mq_put_tag(hctx, hctx->tags, rq->mq_ctx, rq->tag); rq->tag = -1; if (rq->rq_flags & RQF_MQ_INFLIGHT) { rq->rq_flags &= ~RQF_MQ_INFLIGHT; atomic_dec(&hctx->nr_active); } }

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static inline void blk_mq_put_driver_tag_hctx(struct blk_mq_hw_ctx *hctx, struct request *rq) { if (rq->tag == -1 || rq->internal_tag == -1) return; __blk_mq_put_driver_tag(hctx, rq); }

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static inline void blk_mq_put_driver_tag(struct request *rq) { struct blk_mq_hw_ctx *hctx; if (rq->tag == -1 || rq->internal_tag == -1) return; hctx = blk_mq_map_queue(rq->q, rq->mq_ctx->cpu); __blk_mq_put_driver_tag(hctx, rq); }

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#endif

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Tejun Heo13313.03%36.38%
Lei Ming12612.34%612.77%
Bart Van Assche403.92%48.51%
Christoph Hellwig313.04%48.51%
Omar Sandoval262.55%36.38%
Keith Busch80.78%12.13%
Greg Kroah-Hartman10.10%12.13%
Linus Walleij10.10%12.13%
Total1021100.00%47100.00%
Directory: block
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