4 #include <linux/kernel.h>
5 #include <linux/blkdev.h>
6 #include <linux/blk_types.h>
7 #include <linux/atomic.h>
8 #include <linux/wait.h>
16 wait_queue_head_t wait;
21 struct rq_qos_ops *ops;
22 struct request_queue *q;
28 enum wbt_flags (*throttle)(struct rq_qos *, struct bio *,
30 void (*issue)(struct rq_qos *, struct request *);
31 void (*requeue)(struct rq_qos *, struct request *);
32 void (*done)(struct rq_qos *, struct request *);
33 void (*cleanup)(struct rq_qos *, enum wbt_flags);
34 void (*exit)(struct rq_qos *);
38 unsigned int max_depth;
43 unsigned int queue_depth;
44 unsigned int default_depth;
47 static inline struct rq_qos *rq_qos_id(struct request_queue *q,
51 for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
58 static inline struct rq_qos *wbt_rq_qos(struct request_queue *q)
60 return rq_qos_id(q, RQ_QOS_WBT);
63 static inline struct rq_qos *blkcg_rq_qos(struct request_queue *q)
65 return rq_qos_id(q, RQ_QOS_CGROUP);
68 static inline void rq_wait_init(struct rq_wait *rq_wait)
70 atomic_set(&rq_wait->inflight, 0);
71 init_waitqueue_head(&rq_wait->wait);
74 static inline void rq_qos_add(struct request_queue *q, struct rq_qos *rqos)
76 rqos->next = q->rq_qos;
80 static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos)
82 struct rq_qos *cur, *prev = NULL;
83 for (cur = q->rq_qos; cur; cur = cur->next) {
86 prev->next = rqos->next;
95 bool rq_wait_inc_below(struct rq_wait *rq_wait, int limit);
96 void rq_depth_scale_up(struct rq_depth *rqd);
97 void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle);
98 bool rq_depth_calc_max_depth(struct rq_depth *rqd);
100 void rq_qos_cleanup(struct request_queue *, enum wbt_flags);
101 void rq_qos_done(struct request_queue *, struct request *);
102 void rq_qos_issue(struct request_queue *, struct request *);
103 void rq_qos_requeue(struct request_queue *, struct request *);
104 enum wbt_flags rq_qos_throttle(struct request_queue *, struct bio *, spinlock_t *);
105 void rq_qos_exit(struct request_queue *);