block/blk-mq-sched.h

   1 #ifndef BLK_MQ_SCHED_H
   2 #define BLK_MQ_SCHED_H
   3
   4 #include "blk-mq.h"
   5 #include "blk-mq-tag.h"
   6
   7 int blk_mq_sched_init_hctx_data(struct request_queue *q, size_t size,
   8                                 int (*init)(struct blk_mq_hw_ctx *),
   9                                 void (*exit)(struct blk_mq_hw_ctx *));
  10
  11 void blk_mq_sched_free_hctx_data(struct request_queue *q,
  12                                  void (*exit)(struct blk_mq_hw_ctx *));
  13
  14 struct request *blk_mq_sched_get_request(struct request_queue *q, struct bio *bio, unsigned int op, struct blk_mq_alloc_data *data);
  15 void blk_mq_sched_put_request(struct request *rq);
  16
  17 void blk_mq_sched_request_inserted(struct request *rq);
  18 bool blk_mq_sched_bypass_insert(struct blk_mq_hw_ctx *hctx, struct request *rq);
  19 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio);
  20 bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio);
  21 bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq);
  22
  23 void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
  24 void blk_mq_sched_move_to_dispatch(struct blk_mq_hw_ctx *hctx,
  25                         struct list_head *rq_list,
  26                         struct request *(*get_rq)(struct blk_mq_hw_ctx *));
  27
  28 int blk_mq_sched_setup(struct request_queue *q);
  29 void blk_mq_sched_teardown(struct request_queue *q);
  30
  31 static inline bool
  32 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio)
  33 {
  34         struct elevator_queue *e = q->elevator;
  35
  36         if (!e || blk_queue_nomerges(q) || !bio_mergeable(bio))
  37                 return false;
  38
  39         return __blk_mq_sched_bio_merge(q, bio);
  40 }
  41
  42 static inline int blk_mq_sched_get_rq_priv(struct request_queue *q,
  43                                            struct request *rq)
  44 {
  45         struct elevator_queue *e = q->elevator;
  46
  47         if (e && e->type->ops.mq.get_rq_priv)
  48                 return e->type->ops.mq.get_rq_priv(q, rq);
  49
  50         return 0;
  51 }
  52
  53 static inline void blk_mq_sched_put_rq_priv(struct request_queue *q,
  54                                             struct request *rq)
  55 {
  56         struct elevator_queue *e = q->elevator;
  57
  58         if (e && e->type->ops.mq.put_rq_priv)
  59                 e->type->ops.mq.put_rq_priv(q, rq);
  60 }
  61
  62 static inline void
  63 blk_mq_sched_insert_request(struct request *rq, bool at_head, bool run_queue,
  64                             bool async)
  65 {
  66         struct request_queue *q = rq->q;
  67         struct elevator_queue *e = q->elevator;
  68         struct blk_mq_ctx *ctx = rq->mq_ctx;
  69         struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, ctx->cpu);
  70
  71         if (e && e->type->ops.mq.insert_requests) {
  72                 LIST_HEAD(list);
  73
  74                 list_add(&rq->queuelist, &list);
  75                 e->type->ops.mq.insert_requests(hctx, &list, at_head);
  76         } else {
  77                 spin_lock(&ctx->lock);
  78                 __blk_mq_insert_request(hctx, rq, at_head);
  79                 spin_unlock(&ctx->lock);
  80         }
  81
  82         if (run_queue)
  83                 blk_mq_run_hw_queue(hctx, async);
  84 }
  85
  86 static inline void
  87 blk_mq_sched_insert_requests(struct request_queue *q, struct blk_mq_ctx *ctx,
  88                              struct list_head *list, bool run_queue_async)
  89 {
  90         struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, ctx->cpu);
  91         struct elevator_queue *e = hctx->queue->elevator;
  92
  93         if (e && e->type->ops.mq.insert_requests)
  94                 e->type->ops.mq.insert_requests(hctx, list, false);
  95         else
  96                 blk_mq_insert_requests(hctx, ctx, list);
  97
  98         blk_mq_run_hw_queue(hctx, run_queue_async);
  99 }
 100
 101 static inline bool
 102 blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
 103                          struct bio *bio)
 104 {
 105         struct elevator_queue *e = q->elevator;
 106
 107         if (e && e->type->ops.mq.allow_merge)
 108                 return e->type->ops.mq.allow_merge(q, rq, bio);
 109
 110         return true;
 111 }
 112
 113 static inline void
 114 blk_mq_sched_completed_request(struct blk_mq_hw_ctx *hctx, struct request *rq)
 115 {
 116         struct elevator_queue *e = hctx->queue->elevator;
 117
 118         if (e && e->type->ops.mq.completed_request)
 119                 e->type->ops.mq.completed_request(hctx, rq);
 120
 121         BUG_ON(rq->internal_tag == -1);
 122
 123         blk_mq_put_tag(hctx, hctx->sched_tags, rq->mq_ctx, rq->internal_tag);
 124
 125         if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state)) {
 126                 clear_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
 127                 blk_mq_run_hw_queue(hctx, true);
 128         }
 129 }
 130
 131 static inline void blk_mq_sched_started_request(struct request *rq)
 132 {
 133         struct request_queue *q = rq->q;
 134         struct elevator_queue *e = q->elevator;
 135
 136         if (e && e->type->ops.mq.started_request)
 137                 e->type->ops.mq.started_request(rq);
 138 }
 139
 140 static inline void blk_mq_sched_requeue_request(struct request *rq)
 141 {
 142         struct request_queue *q = rq->q;
 143         struct elevator_queue *e = q->elevator;
 144
 145         if (e && e->type->ops.mq.requeue_request)
 146                 e->type->ops.mq.requeue_request(rq);
 147 }
 148
 149 static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
 150 {
 151         struct elevator_queue *e = hctx->queue->elevator;
 152
 153         if (e && e->type->ops.mq.has_work)
 154                 return e->type->ops.mq.has_work(hctx);
 155
 156         return false;
 157 }
 158
 159 static inline void blk_mq_sched_mark_restart(struct blk_mq_hw_ctx *hctx)
 160 {
 161         if (!test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
 162                 set_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
 163 }
 164
 165 static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
 166 {
 167         return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
 168 }
 169
 170 #endif