[mirror_ubuntu-bionic-kernel.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;

	unsigned int		last_tag ____cacheline_aligned_in_smp;

	/* 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_complete_request(struct request *rq);
void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
void blk_mq_init_flush(struct request_queue *q);
void blk_mq_drain_queue(struct request_queue *q);
void blk_mq_free_queue(struct request_queue *q);
void blk_mq_clone_flush_request(struct request *flush_rq,
		struct request *orig_rq);

/*
 * CPU hotplug helpers
 */
struct blk_mq_cpu_notifier;
void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
			      void (*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);

/*
 * Basic implementation of sparser bitmap, allowing the user to spread
 * the bits over more cachelines.
 */
struct blk_align_bitmap {
	unsigned long word;
	unsigned long depth;
} ____cacheline_aligned_in_smp;

#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	14
4bb659b1 JA	15	unsigned int last_tag ____cacheline_aligned_in_smp;
4bb659b1 JA	16
320ae51f JA	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
30a91cb4	28	void __blk_mq_complete_request(struct request *rq);
320ae51f JA	29	void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
320ae51f JA	30	void blk_mq_init_flush(struct request_queue *q);
43a5e4e2	31	void blk_mq_drain_queue(struct request_queue *q);
3edcc0ce	32	void blk_mq_free_queue(struct request_queue *q);
8727af4b CH	33	void blk_mq_clone_flush_request(struct request *flush_rq,
8727af4b CH	34	struct request *orig_rq);
320ae51f JA	35
	36	/*
	37	* CPU hotplug helpers
	38	*/
	39	struct blk_mq_cpu_notifier;
	40	void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
	41	void (fn)(void , unsigned long, unsigned int),
	42	void *data);
	43	void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
	44	void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
	45	void blk_mq_cpu_init(void);
676141e4 JA	46	void blk_mq_enable_hotplug(void);
676141e4 JA	47	void blk_mq_disable_hotplug(void);
320ae51f JA	48
	49	/*
	50	* CPU -> queue mappings
	51	*/
24d2f903	52	extern unsigned int blk_mq_make_queue_map(struct blk_mq_tag_set set);
320ae51f JA	53	extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues);
320ae51f JA	54
e93ecf60 JA	55	/*
	56	* Basic implementation of sparser bitmap, allowing the user to spread
	57	* the bits over more cachelines.
	58	*/
	59	struct blk_align_bitmap {
	60	unsigned long word;
	61	unsigned long depth;
	62	} ____cacheline_aligned_in_smp;
	63
320ae51f	64	#endif