block/blk-mq-sched.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef BLK_MQ_SCHED_H
   3 #define BLK_MQ_SCHED_H
   4
   5 #include "elevator.h"
   6 #include "blk-mq.h"
   7 #include "blk-mq-tag.h"
   8
   9 #define MAX_SCHED_RQ (16 * BLKDEV_DEFAULT_RQ)
  10
  11 struct io_cq *blk_mq_sched_get_icq(struct request_queue *q);
  12 void blk_mq_sched_assign_ioc(struct request *rq);
  13
  14 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
  15                 unsigned int nr_segs, struct request **merged_request);
  16 bool blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
  17                 unsigned int nr_segs);
  18 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq,
  19                                    struct list_head *free);
  20 void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
  21 void __blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
  22
  23 void blk_mq_sched_insert_request(struct request *rq, bool at_head,
  24                                  bool run_queue, bool async);
  25 void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
  26                                   struct blk_mq_ctx *ctx,
  27                                   struct list_head *list, bool run_queue_async);
  28
  29 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
  30
  31 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
  32 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
  33 void blk_mq_sched_free_rqs(struct request_queue *q);
  34
  35 static inline void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx)
  36 {
  37         if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
  38                 __blk_mq_sched_restart(hctx);
  39 }
  40
  41 static inline bool bio_mergeable(struct bio *bio)
  42 {
  43         return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
  44 }
  45
  46 static inline bool
  47 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
  48                          struct bio *bio)
  49 {
  50         if (rq->rq_flags & RQF_ELV) {
  51                 struct elevator_queue *e = q->elevator;
  52
  53                 if (e->type->ops.allow_merge)
  54                         return e->type->ops.allow_merge(q, rq, bio);
  55         }
  56         return true;
  57 }
  58
  59 static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
  60 {
  61         if (rq->rq_flags & RQF_ELV) {
  62                 struct elevator_queue *e = rq->q->elevator;
  63
  64                 if (e->type->ops.completed_request)
  65                         e->type->ops.completed_request(rq, now);
  66         }
  67 }
  68
  69 static inline void blk_mq_sched_requeue_request(struct request *rq)
  70 {
  71         if (rq->rq_flags & RQF_ELV) {
  72                 struct request_queue *q = rq->q;
  73                 struct elevator_queue *e = q->elevator;
  74
  75                 if ((rq->rq_flags & RQF_ELVPRIV) && e->type->ops.requeue_request)
  76                         e->type->ops.requeue_request(rq);
  77         }
  78 }
  79
  80 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
  81 {
  82         struct elevator_queue *e = hctx->queue->elevator;
  83
  84         if (e && e->type->ops.has_work)
  85                 return e->type->ops.has_work(hctx);
  86
  87         return false;
  88 }
  89
  90 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
  91 {
  92         return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
  93 }
  94
  95 #endif