11 struct list_head rq_list;
12 } ____cacheline_aligned_in_smp;
15 unsigned int index_hw;
17 /* incremented at dispatch time */
18 unsigned long rq_dispatched[2];
19 unsigned long rq_merged;
21 /* incremented at completion time */
22 unsigned long ____cacheline_aligned_in_smp rq_completed[2];
23 struct blk_rq_stat stat[2];
25 struct request_queue *queue;
27 } ____cacheline_aligned_in_smp;
29 void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
30 void blk_mq_freeze_queue(struct request_queue *q);
31 void blk_mq_free_queue(struct request_queue *q);
32 int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
33 void blk_mq_wake_waiters(struct request_queue *q);
34 bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *, struct list_head *);
35 void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
38 * Internal helpers for allocating/freeing the request map
40 void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
41 unsigned int hctx_idx);
42 void blk_mq_free_rq_map(struct blk_mq_tags *tags);
43 struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set,
44 unsigned int hctx_idx,
46 unsigned int reserved_tags);
47 int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
48 unsigned int hctx_idx, unsigned int depth);
51 * Internal helpers for request insertion into sw queues
53 void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
55 void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
56 struct list_head *list);
60 void blk_mq_enable_hotplug(void);
61 void blk_mq_disable_hotplug(void);
64 * CPU -> queue mappings
66 extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
68 static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
71 return q->queue_hw_ctx[q->mq_map[cpu]];
77 extern int blk_mq_sysfs_register(struct request_queue *q);
78 extern void blk_mq_sysfs_unregister(struct request_queue *q);
79 extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
81 extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
83 void blk_mq_release(struct request_queue *q);
85 static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
88 return per_cpu_ptr(q->queue_ctx, cpu);
92 * This assumes per-cpu software queueing queues. They could be per-node
93 * as well, for instance. For now this is hardcoded as-is. Note that we don't
94 * care about preemption, since we know the ctx's are persistent. This does
95 * mean that we can't rely on ctx always matching the currently running CPU.
97 static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
99 return __blk_mq_get_ctx(q, get_cpu());
102 static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
107 struct blk_mq_alloc_data {
108 /* input parameter */
109 struct request_queue *q;
112 /* input & output parameter */
113 struct blk_mq_ctx *ctx;
114 struct blk_mq_hw_ctx *hctx;
117 static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
118 struct request_queue *q, unsigned int flags,
119 struct blk_mq_ctx *ctx, struct blk_mq_hw_ctx *hctx)
127 static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
129 if (data->flags & BLK_MQ_REQ_INTERNAL)
130 return data->hctx->sched_tags;
132 return data->hctx->tags;
136 * Internal helpers for request allocation/init/free
138 void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
139 struct request *rq, unsigned int op);
140 void __blk_mq_finish_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
142 void blk_mq_finish_request(struct request *rq);
143 struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data,
146 static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
148 return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
151 static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
153 return hctx->nr_ctx && hctx->tags;