[linux-2.6-block.git] / block / blk-mq.h

#ifndef INT_BLK_MQ_H
#define INT_BLK_MQ_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);

/*
 * CPU hotplug helpers
 */
struct blk_mq_cpu_notifier;
void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
			      int (*fn)(void *, unsigned long, unsigned int),
			      void *data);
void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
void blk_mq_cpu_init(void);
void blk_mq_enable_hotplug(void);
void blk_mq_disable_hotplug(void);

/*
 * CPU -> queue mappings
 */
extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set);
extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues,
				   const struct cpumask *online_mask);
extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);

/*
 * sysfs helpers
 */
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;

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

static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
		struct request_queue *q, unsigned int flags,
		struct blk_mq_ctx *ctx, struct blk_mq_hw_ctx *hctx)
{
	data->q = q;
	data->flags = flags;
	data->ctx = ctx;
	data->hctx = hctx;
}

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
24d2f903 CH	4	struct blk_mq_tag_set;
24d2f903 CH	5
320ae51f JA	6	struct blk_mq_ctx {
	7	struct {
	8	spinlock_t lock;
	9	struct list_head rq_list;
	10	} ____cacheline_aligned_in_smp;
	11
	12	unsigned int cpu;
	13	unsigned int index_hw;
320ae51f JA	14
	15	/* incremented at dispatch time */
	16	unsigned long rq_dispatched[2];
	17	unsigned long rq_merged;
	18
	19	/* incremented at completion time */
	20	unsigned long ____cacheline_aligned_in_smp rq_completed[2];
	21
	22	struct request_queue *queue;
	23	struct kobject kobj;
4bb659b1	24	} ____cacheline_aligned_in_smp;
320ae51f	25
320ae51f	26	void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
780db207	27	void blk_mq_freeze_queue(struct request_queue *q);
3edcc0ce	28	void blk_mq_free_queue(struct request_queue *q);
e3a2b3f9	29	int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
aed3ea94	30	void blk_mq_wake_waiters(struct request_queue *q);
320ae51f JA	31
	32	/*
	33	* CPU hotplug helpers
	34	*/
	35	struct blk_mq_cpu_notifier;
	36	void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
e814e71b	37	int (fn)(void , unsigned long, unsigned int),
320ae51f JA	38	void *data);
	39	void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
	40	void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
	41	void blk_mq_cpu_init(void);
676141e4 JA	42	void blk_mq_enable_hotplug(void);
676141e4 JA	43	void blk_mq_disable_hotplug(void);
320ae51f JA	44
	45	/*
	46	* CPU -> queue mappings
	47	*/
24d2f903	48	extern unsigned int blk_mq_make_queue_map(struct blk_mq_tag_set set);
5778322e AM	49	extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues,
5778322e AM	50	const struct cpumask *online_mask);
f14bbe77	51	extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
320ae51f	52
67aec14c JA	53	/*
	54	* sysfs helpers
	55	*/
	56	extern int blk_mq_sysfs_register(struct request_queue *q);
	57	extern void blk_mq_sysfs_unregister(struct request_queue *q);
868f2f0b	58	extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
67aec14c	59
90415837 CH	60	extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
90415837 CH	61
e09aae7e ML	62	void blk_mq_release(struct request_queue *q);
e09aae7e ML	63
1aecfe48 ML	64	static inline struct blk_mq_ctx __blk_mq_get_ctx(struct request_queue q,
	65	unsigned int cpu)
	66	{
	67	return per_cpu_ptr(q->queue_ctx, cpu);
	68	}
	69
	70	/*
	71	* This assumes per-cpu software queueing queues. They could be per-node
	72	* as well, for instance. For now this is hardcoded as-is. Note that we don't
	73	* care about preemption, since we know the ctx's are persistent. This does
	74	* mean that we can't rely on ctx always matching the currently running CPU.
	75	*/
	76	static inline struct blk_mq_ctx blk_mq_get_ctx(struct request_queue q)
	77	{
	78	return __blk_mq_get_ctx(q, get_cpu());
	79	}
	80
	81	static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
	82	{
	83	put_cpu();
	84	}
	85
cb96a42c ML	86	struct blk_mq_alloc_data {
	87	/* input parameter */
	88	struct request_queue *q;
6f3b0e8b	89	unsigned int flags;
cb96a42c ML	90
	91	/* input & output parameter */
	92	struct blk_mq_ctx *ctx;
	93	struct blk_mq_hw_ctx *hctx;
	94	};
	95
	96	static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
6f3b0e8b CH	97	struct request_queue *q, unsigned int flags,
6f3b0e8b CH	98	struct blk_mq_ctx ctx, struct blk_mq_hw_ctx hctx)
cb96a42c ML	99	{
cb96a42c ML	100	data->q = q;
6f3b0e8b	101	data->flags = flags;
cb96a42c ML	102	data->ctx = ctx;
	103	data->hctx = hctx;
	104	}
	105
19c66e59 ML	106	static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
	107	{
	108	return hctx->nr_ctx && hctx->tags;
	109	}
	110
320ae51f	111	#endif