1#ifndef INT_BLK_MQ_H
  2#define INT_BLK_MQ_H
  3
  4struct blk_mq_tag_set;
  5
  6struct 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;
 14
 15	unsigned int		last_tag ____cacheline_aligned_in_smp;
 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;
 26} ____cacheline_aligned_in_smp;
 27
 
 28void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
 29void blk_mq_freeze_queue(struct request_queue *q);
 
 30void blk_mq_free_queue(struct request_queue *q);
 31int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
 32void blk_mq_wake_waiters(struct request_queue *q);
 33
 34/*
 35 * CPU hotplug helpers
 36 */
 37struct blk_mq_cpu_notifier;
 38void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
 39			      int (*fn)(void *, unsigned long, unsigned int),
 40			      void *data);
 41void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
 42void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
 43void blk_mq_cpu_init(void);
 44void blk_mq_enable_hotplug(void);
 45void blk_mq_disable_hotplug(void);
 46
 47/*
 48 * CPU -> queue mappings
 49 */
 50extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set);
 51extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues,
 52				   const struct cpumask *online_mask);
 53extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
 54
 55/*
 56 * sysfs helpers
 57 */
 58extern int blk_mq_sysfs_register(struct request_queue *q);
 59extern void blk_mq_sysfs_unregister(struct request_queue *q);
 60extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
 61
 62extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
 63
 64void blk_mq_release(struct request_queue *q);
 65
 66/*
 67 * Basic implementation of sparser bitmap, allowing the user to spread
 68 * the bits over more cachelines.
 69 */
 70struct blk_align_bitmap {
 71	unsigned long word;
 72	unsigned long depth;
 73} ____cacheline_aligned_in_smp;
 74
 75static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
 76					   unsigned int cpu)
 77{
 78	return per_cpu_ptr(q->queue_ctx, cpu);
 79}
 80
 81/*
 82 * This assumes per-cpu software queueing queues. They could be per-node
 83 * as well, for instance. For now this is hardcoded as-is. Note that we don't
 84 * care about preemption, since we know the ctx's are persistent. This does
 85 * mean that we can't rely on ctx always matching the currently running CPU.
 86 */
 87static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
 88{
 89	return __blk_mq_get_ctx(q, get_cpu());
 90}
 91
 92static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
 93{
 94	put_cpu();
 95}
 96
 97struct blk_mq_alloc_data {
 98	/* input parameter */
 99	struct request_queue *q;
100	unsigned int flags;
101
102	/* input & output parameter */
103	struct blk_mq_ctx *ctx;
104	struct blk_mq_hw_ctx *hctx;
105};
106
107static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
108		struct request_queue *q, unsigned int flags,
109		struct blk_mq_ctx *ctx, struct blk_mq_hw_ctx *hctx)
110{
111	data->q = q;
112	data->flags = flags;
113	data->ctx = ctx;
114	data->hctx = hctx;
115}
116
117static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
118{
119	return hctx->nr_ctx && hctx->tags;
120}
121
122#endif

 1#ifndef INT_BLK_MQ_H
 2#define INT_BLK_MQ_H
 3
 
 
 4struct blk_mq_ctx {
 5	struct {
 6		spinlock_t		lock;
 7		struct list_head	rq_list;
 8	}  ____cacheline_aligned_in_smp;
 9
10	unsigned int		cpu;
11	unsigned int		index_hw;
12	unsigned int		ipi_redirect;
 
13
14	/* incremented at dispatch time */
15	unsigned long		rq_dispatched[2];
16	unsigned long		rq_merged;
17
18	/* incremented at completion time */
19	unsigned long		____cacheline_aligned_in_smp rq_completed[2];
20
21	struct request_queue	*queue;
22	struct kobject		kobj;
23};
24
25void __blk_mq_complete_request(struct request *rq);
26void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
27void blk_mq_init_flush(struct request_queue *q);
28void blk_mq_drain_queue(struct request_queue *q);
29void blk_mq_free_queue(struct request_queue *q);
30void blk_mq_rq_init(struct blk_mq_hw_ctx *hctx, struct request *rq);
 
31
32/*
33 * CPU hotplug helpers
34 */
35struct blk_mq_cpu_notifier;
36void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
37			      void (*fn)(void *, unsigned long, unsigned int),
38			      void *data);
39void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
40void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
41void blk_mq_cpu_init(void);
42void blk_mq_enable_hotplug(void);
43void blk_mq_disable_hotplug(void);
44
45/*
46 * CPU -> queue mappings
47 */
48struct blk_mq_reg;
49extern unsigned int *blk_mq_make_queue_map(struct blk_mq_reg *reg);
50extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
51
52void blk_mq_add_timer(struct request *rq);
 
 
 
 
 
 
 
 
 
 
 
 
 
53
54#endif