1 files changed, 85 insertions, 0 deletions
diff --git a/block/blk-mq-sched.h b/block/blk-mq-sched.h
new file mode 100644
index 000000000..1326526bb
--- /dev/null
+++ b/block/blk-mq-sched.h
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef BLK_MQ_SCHED_H
+#define BLK_MQ_SCHED_H
+
+#include "elevator.h"
+#include "blk-mq.h"
+
+#define MAX_SCHED_RQ (16 * BLKDEV_DEFAULT_RQ)
+
+bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
+		unsigned int nr_segs, struct request **merged_request);
+bool blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
+		unsigned int nr_segs);
+bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq,
+				   struct list_head *free);
+void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx);
+void __blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
+
+void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
+
+int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
+void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
+void blk_mq_sched_free_rqs(struct request_queue *q);
+
+static inline void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx)
+{
+	if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
+		__blk_mq_sched_restart(hctx);
+}
+
+static inline bool bio_mergeable(struct bio *bio)
+{
+	return !(bio->bi_opf & REQ_NOMERGE_FLAGS);
+}
+
+static inline bool
+blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
+			 struct bio *bio)
+{
+	if (rq->rq_flags & RQF_USE_SCHED) {
+		struct elevator_queue *e = q->elevator;
+
+		if (e->type->ops.allow_merge)
+			return e->type->ops.allow_merge(q, rq, bio);
+	}
+	return true;
+}
+
+static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
+{
+	if (rq->rq_flags & RQF_USE_SCHED) {
+		struct elevator_queue *e = rq->q->elevator;
+
+		if (e->type->ops.completed_request)
+			e->type->ops.completed_request(rq, now);
+	}
+}
+
+static inline void blk_mq_sched_requeue_request(struct request *rq)
+{
+	if (rq->rq_flags & RQF_USE_SCHED) {
+		struct request_queue *q = rq->q;
+		struct elevator_queue *e = q->elevator;
+
+		if (e->type->ops.requeue_request)
+			e->type->ops.requeue_request(rq);
+	}
+}
+
+static inline bool blk_mq_sched_has_work(struct blk_mq_hw_ctx *hctx)
+{
+	struct elevator_queue *e = hctx->queue->elevator;
+
+	if (e && e->type->ops.has_work)
+		return e->type->ops.has_work(hctx);
+
+	return false;
+}
+
+static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
+{
+	return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
+}
+
+#endif