1 files changed, 84 insertions, 31 deletions

diff --git a/block/blk-mq-sched.h b/block/blk-mq-sched.h
index 5246ae040704..02c40a72e959 100644
--- a/block/blk-mq-sched.h
+++ b/block/blk-mq-sched.h
@@ -2,71 +2,113 @@
 #ifndef BLK_MQ_SCHED_H
 #define BLK_MQ_SCHED_H
 
+#include "elevator.h"
 #include "blk-mq.h"
-#include "blk-mq-tag.h"
 
-#define MAX_SCHED_RQ (16 * BLKDEV_MAX_RQ)
-
-void blk_mq_sched_assign_ioc(struct request *rq);
+#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,
+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_insert_request(struct request *rq, bool at_head,
-				 bool run_queue, bool async);
-void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
-				  struct blk_mq_ctx *ctx,
-				  struct list_head *list, bool run_queue_async);
+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);
+int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e,
+		struct elevator_resources *res);
 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
-void blk_mq_sched_free_requests(struct request_queue *q);
+void blk_mq_sched_free_rqs(struct request_queue *q);
+
+struct elevator_tags *blk_mq_alloc_sched_tags(struct blk_mq_tag_set *set,
+		unsigned int nr_hw_queues, unsigned int nr_requests);
+int blk_mq_alloc_sched_res(struct request_queue *q,
+		struct elevator_type *type,
+		struct elevator_resources *res,
+		unsigned int nr_hw_queues);
+int blk_mq_alloc_sched_res_batch(struct xarray *elv_tbl,
+		struct blk_mq_tag_set *set, unsigned int nr_hw_queues);
+int blk_mq_alloc_sched_ctx_batch(struct xarray *elv_tbl,
+		struct blk_mq_tag_set *set);
+void blk_mq_free_sched_ctx_batch(struct xarray *elv_tbl);
+void blk_mq_free_sched_tags(struct elevator_tags *et,
+		struct blk_mq_tag_set *set);
+void blk_mq_free_sched_res(struct elevator_resources *res,
+		struct elevator_type *type,
+		struct blk_mq_tag_set *set);
+void blk_mq_free_sched_res_batch(struct xarray *et_table,
+		struct blk_mq_tag_set *set);
+/*
+ * blk_mq_alloc_sched_data() - Allocates scheduler specific data
+ * Returns:
+ *         - Pointer to allocated data on success
+ *         - NULL if no allocation needed
+ *         - ERR_PTR(-ENOMEM) in case of failure
+ */
+static inline void *blk_mq_alloc_sched_data(struct request_queue *q,
+		struct elevator_type *e)
+{
+	void *sched_data;
 
-static inline bool
-blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
-		unsigned int nr_segs)
+	if (!e || !e->ops.alloc_sched_data)
+		return NULL;
+
+	sched_data = e->ops.alloc_sched_data(q);
+	return (sched_data) ?: ERR_PTR(-ENOMEM);
+}
+
+static inline void blk_mq_free_sched_data(struct elevator_type *e, void *data)
 {
-	if (blk_queue_nomerges(q) || !bio_mergeable(bio))
-		return false;
+	if (e && e->ops.free_sched_data)
+		e->ops.free_sched_data(data);
+}
 
-	return __blk_mq_sched_bio_merge(q, bio, nr_segs);
+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)
 {
-	struct elevator_queue *e = q->elevator;
-
-	if (e && e->type->ops.allow_merge)
-		return e->type->ops.allow_merge(q, rq, 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)
 {
-	struct elevator_queue *e = rq->q->elevator;
+	if (rq->rq_flags & RQF_USE_SCHED) {
+		struct elevator_queue *e = rq->q->elevator;
 
-	if (e && e->type->ops.completed_request)
-		e->type->ops.completed_request(rq, now);
+		if (e->type->ops.completed_request)
+			e->type->ops.completed_request(rq, now);
+	}
 }
 
 static inline void blk_mq_sched_requeue_request(struct request *rq)
 {
-	struct request_queue *q = rq->q;
-	struct elevator_queue *e = q->elevator;
+	if (rq->rq_flags & RQF_USE_SCHED) {
+		struct request_queue *q = rq->q;
+		struct elevator_queue *e = q->elevator;
 
-	if ((rq->rq_flags & RQF_ELVPRIV) && e && e->type->ops.requeue_request)
-		e->type->ops.requeue_request(rq);
+		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)
@@ -84,4 +126,15 @@ static inline bool blk_mq_sched_needs_restart(struct blk_mq_hw_ctx *hctx)
 	return test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
 }
 
+static inline void blk_mq_set_min_shallow_depth(struct request_queue *q,
+						unsigned int depth)
+{
+	struct blk_mq_hw_ctx *hctx;
+	unsigned long i;
+
+	queue_for_each_hw_ctx(q, hctx, i)
+		sbitmap_queue_min_shallow_depth(&hctx->sched_tags->bitmap_tags,
+						depth);
+}
+
 #endif