[mirror_ubuntu-artful-kernel.git] / block / blk-mq.h

#ifndef INT_BLK_MQ_H
#define INT_BLK_MQ_H

#include "blk-stat.h"

struct blk_mq_tag_set;

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;

void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
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 *);
void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx);
bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx,
				bool wait);

/*
 * 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);
void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
				struct list_head *list);

/*
 * 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]];
}

/*
 * 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);

extern void blk_mq_rq_timed_out(struct request *req, bool reserved);

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, get_cpu());
}

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

struct blk_mq_alloc_data {
	/* input parameter */
	struct request_queue *q;
	unsigned int 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;
}

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;
}

#endif
Commit	Line	Data
320ae51f JA	1	#ifndef INT_BLK_MQ_H
	2	#define INT_BLK_MQ_H
	3
cf43e6be JA	4	#include "blk-stat.h"
cf43e6be JA	5
24d2f903 CH	6	struct blk_mq_tag_set;
24d2f903 CH	7
320ae51f JA	8	struct blk_mq_ctx {
	9	struct {
	10	spinlock_t lock;
	11	struct list_head rq_list;
	12	} ____cacheline_aligned_in_smp;
	13
	14	unsigned int cpu;
	15	unsigned int index_hw;
320ae51f JA	16
	17	/* incremented at dispatch time */
	18	unsigned long rq_dispatched[2];
	19	unsigned long rq_merged;
	20
	21	/* incremented at completion time */
	22	unsigned long ____cacheline_aligned_in_smp rq_completed[2];
	23
	24	struct request_queue *queue;
	25	struct kobject kobj;
4bb659b1	26	} ____cacheline_aligned_in_smp;
320ae51f	27
320ae51f	28	void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
780db207	29	void blk_mq_freeze_queue(struct request_queue *q);
3edcc0ce	30	void blk_mq_free_queue(struct request_queue *q);
e3a2b3f9	31	int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
aed3ea94	32	void blk_mq_wake_waiters(struct request_queue *q);
81380ca1	33	bool blk_mq_dispatch_rq_list(struct request_queue , struct list_head );
2c3ad667	34	void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx hctx, struct list_head list);
50e1dab8	35	bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx);
bd6737f1 JA	36	bool blk_mq_get_driver_tag(struct request rq, struct blk_mq_hw_ctx *hctx,
bd6737f1 JA	37	bool wait);
2c3ad667 JA	38
	39	/*
	40	* Internal helpers for allocating/freeing the request map
	41	*/
cc71a6f4 JA	42	void blk_mq_free_rqs(struct blk_mq_tag_set set, struct blk_mq_tags tags,
	43	unsigned int hctx_idx);
	44	void blk_mq_free_rq_map(struct blk_mq_tags *tags);
	45	struct blk_mq_tags blk_mq_alloc_rq_map(struct blk_mq_tag_set set,
	46	unsigned int hctx_idx,
	47	unsigned int nr_tags,
	48	unsigned int reserved_tags);
	49	int blk_mq_alloc_rqs(struct blk_mq_tag_set set, struct blk_mq_tags tags,
	50	unsigned int hctx_idx, unsigned int depth);
2c3ad667 JA	51
	52	/*
	53	* Internal helpers for request insertion into sw queues
	54	*/
	55	void __blk_mq_insert_request(struct blk_mq_hw_ctx hctx, struct request rq,
	56	bool at_head);
c8e7f707	57	void blk_mq_request_bypass_insert(struct request *rq);
bd166ef1 JA	58	void blk_mq_insert_requests(struct blk_mq_hw_ctx hctx, struct blk_mq_ctx ctx,
bd166ef1 JA	59	struct list_head *list);
320ae51f JA	60
	61	/*
	62	* CPU -> queue mappings
	63	*/
f14bbe77	64	extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
320ae51f	65
7d7e0f90 CH	66	static inline struct blk_mq_hw_ctx blk_mq_map_queue(struct request_queue q,
	67	int cpu)
	68	{
	69	return q->queue_hw_ctx[q->mq_map[cpu]];
	70	}
	71
67aec14c JA	72	/*
	73	* sysfs helpers
	74	*/
737f98cf	75	extern void blk_mq_sysfs_init(struct request_queue *q);
7ea5fe31	76	extern void blk_mq_sysfs_deinit(struct request_queue *q);
2d0364c8	77	extern int __blk_mq_register_dev(struct device dev, struct request_queue q);
67aec14c JA	78	extern int blk_mq_sysfs_register(struct request_queue *q);
67aec14c JA	79	extern void blk_mq_sysfs_unregister(struct request_queue *q);
868f2f0b	80	extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
67aec14c	81
90415837 CH	82	extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
90415837 CH	83
e09aae7e ML	84	void blk_mq_release(struct request_queue *q);
e09aae7e ML	85
1aecfe48 ML	86	static inline struct blk_mq_ctx __blk_mq_get_ctx(struct request_queue q,
	87	unsigned int cpu)
	88	{
	89	return per_cpu_ptr(q->queue_ctx, cpu);
	90	}
	91
	92	/*
	93	* This assumes per-cpu software queueing queues. They could be per-node
	94	* as well, for instance. For now this is hardcoded as-is. Note that we don't
	95	* care about preemption, since we know the ctx's are persistent. This does
	96	* mean that we can't rely on ctx always matching the currently running CPU.
	97	*/
	98	static inline struct blk_mq_ctx blk_mq_get_ctx(struct request_queue q)
	99	{
	100	return __blk_mq_get_ctx(q, get_cpu());
	101	}
	102
	103	static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
	104	{
	105	put_cpu();
	106	}
	107
cb96a42c ML	108	struct blk_mq_alloc_data {
	109	/* input parameter */
	110	struct request_queue *q;
6f3b0e8b	111	unsigned int flags;
229a9287	112	unsigned int shallow_depth;
cb96a42c ML	113
	114	/* input & output parameter */
	115	struct blk_mq_ctx *ctx;
	116	struct blk_mq_hw_ctx *hctx;
	117	};
	118
4941115b JA	119	static inline struct blk_mq_tags blk_mq_tags_from_data(struct blk_mq_alloc_data data)
4941115b JA	120	{
bd166ef1 JA	121	if (data->flags & BLK_MQ_REQ_INTERNAL)
	122	return data->hctx->sched_tags;
	123
4941115b JA	124	return data->hctx->tags;
	125	}
	126
5d1b25c1 BVA	127	static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
	128	{
	129	return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
	130	}
	131
19c66e59 ML	132	static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
	133	{
	134	return hctx->nr_ctx && hctx->tags;
	135	}
	136
320ae51f	137	#endif