62 	struct request_queue *q = rq->q;  in elv_iosched_allow_bio_merge()  local
63 	struct elevator_queue *e = q->elevator;  in elv_iosched_allow_bio_merge()
66 		return e->type->ops.allow_merge(q, rq, bio);  in elv_iosched_allow_bio_merge()
140 static struct elevator_type *elevator_get(struct request_queue *q,  in elevator_get()  argument
147 	e = elevator_find(name, q->required_elevator_features);  in elevator_get()
152 		e = elevator_find(name, q->required_elevator_features);  in elevator_get()
164 struct elevator_queue *elevator_alloc(struct request_queue *q,  in elevator_alloc()  argument
169 	eq = kzalloc_node(sizeof(*eq), GFP_KERNEL, q->node);  in elevator_alloc()
191 void __elevator_exit(struct request_queue *q, struct elevator_queue *e)  in __elevator_exit()  argument
195 		blk_mq_exit_sched(q, e);  in __elevator_exit()
207 void elv_rqhash_del(struct request_queue *q, struct request *rq)  in elv_rqhash_del()  argument
214 void elv_rqhash_add(struct request_queue *q, struct request *rq)  in elv_rqhash_add()  argument
216 	struct elevator_queue *e = q->elevator;  in elv_rqhash_add()
224 void elv_rqhash_reposition(struct request_queue *q, struct request *rq)  in elv_rqhash_reposition()  argument
227 	elv_rqhash_add(q, rq);  in elv_rqhash_reposition()
230 struct request *elv_rqhash_find(struct request_queue *q, sector_t offset)  in elv_rqhash_find()  argument
232 	struct elevator_queue *e = q->elevator;  in elv_rqhash_find()
304 enum elv_merge elv_merge(struct request_queue *q, struct request **req,  in elv_merge()  argument
307 	struct elevator_queue *e = q->elevator;  in elv_merge()
316 	if (blk_queue_nomerges(q) || !bio_mergeable(bio))  in elv_merge()
322 	if (q->last_merge && elv_bio_merge_ok(q->last_merge, bio)) {  in elv_merge()
323 		enum elv_merge ret = blk_try_merge(q->last_merge, bio);  in elv_merge()
326 			*req = q->last_merge;  in elv_merge()
331 	if (blk_queue_noxmerges(q))  in elv_merge()
337 	__rq = elv_rqhash_find(q, bio->bi_iter.bi_sector);  in elv_merge()
344 		return e->type->ops.request_merge(q, req, bio);  in elv_merge()
356 bool elv_attempt_insert_merge(struct request_queue *q, struct request *rq)  in elv_attempt_insert_merge()  argument
361 	if (blk_queue_nomerges(q))  in elv_attempt_insert_merge()
367 	if (q->last_merge && blk_attempt_req_merge(q, q->last_merge, rq))  in elv_attempt_insert_merge()
370 	if (blk_queue_noxmerges(q))  in elv_attempt_insert_merge()
378 		__rq = elv_rqhash_find(q, blk_rq_pos(rq));  in elv_attempt_insert_merge()
379 		if (!__rq || !blk_attempt_req_merge(q, __rq, rq))  in elv_attempt_insert_merge()
390 void elv_merged_request(struct request_queue *q, struct request *rq,  in elv_merged_request()  argument
393 	struct elevator_queue *e = q->elevator;  in elv_merged_request()
396 		e->type->ops.request_merged(q, rq, type);  in elv_merged_request()
399 		elv_rqhash_reposition(q, rq);  in elv_merged_request()
401 	q->last_merge = rq;  in elv_merged_request()
404 void elv_merge_requests(struct request_queue *q, struct request *rq,  in elv_merge_requests()  argument
407 	struct elevator_queue *e = q->elevator;  in elv_merge_requests()
410 		e->type->ops.requests_merged(q, rq, next);  in elv_merge_requests()
412 	elv_rqhash_reposition(q, rq);  in elv_merge_requests()
413 	q->last_merge = rq;  in elv_merge_requests()
416 struct request *elv_latter_request(struct request_queue *q, struct request *rq)  in elv_latter_request()  argument
418 	struct elevator_queue *e = q->elevator;  in elv_latter_request()
421 		return e->type->ops.next_request(q, rq);  in elv_latter_request()
426 struct request *elv_former_request(struct request_queue *q, struct request *rq)  in elv_former_request()  argument
428 	struct elevator_queue *e = q->elevator;  in elv_former_request()
431 		return e->type->ops.former_request(q, rq);  in elv_former_request()
488 int elv_register_queue(struct request_queue *q, bool uevent)  in elv_register_queue()  argument
490 	struct elevator_queue *e = q->elevator;  in elv_register_queue()
493 	error = kobject_add(&e->kobj, &q->kobj, "%s", "iosched");  in elv_register_queue()
516 void elv_unregister_queue(struct request_queue *q)  in elv_unregister_queue()  argument
518 	if (q) {  in elv_unregister_queue()
519 		struct elevator_queue *e = q->elevator;  in elv_unregister_queue()
526 		wbt_enable_default(q);  in elv_unregister_queue()
581 int elevator_switch_mq(struct request_queue *q,  in elevator_switch_mq()  argument
586 	lockdep_assert_held(&q->sysfs_lock);  in elevator_switch_mq()
588 	if (q->elevator) {  in elevator_switch_mq()
589 		if (q->elevator->registered)  in elevator_switch_mq()
590 			elv_unregister_queue(q);  in elevator_switch_mq()
592 		ioc_clear_queue(q);  in elevator_switch_mq()
593 		elevator_exit(q, q->elevator);  in elevator_switch_mq()
596 	ret = blk_mq_init_sched(q, new_e);  in elevator_switch_mq()
601 		ret = elv_register_queue(q, true);  in elevator_switch_mq()
603 			elevator_exit(q, q->elevator);  in elevator_switch_mq()
609 		blk_add_trace_msg(q, "elv switch: %s", new_e->elevator_name);  in elevator_switch_mq()
611 		blk_add_trace_msg(q, "elv switch: none");  in elevator_switch_mq()
617 static inline bool elv_support_iosched(struct request_queue *q)  in elv_support_iosched()  argument
619 	if (!q->mq_ops ||  in elv_support_iosched()
620 	    (q->tag_set && (q->tag_set->flags & BLK_MQ_F_NO_SCHED)))  in elv_support_iosched()
629 static struct elevator_type *elevator_get_default(struct request_queue *q)  in elevator_get_default()  argument
631 	if (q->nr_hw_queues != 1)  in elevator_get_default()
634 	return elevator_get(q, "mq-deadline", false);  in elevator_get_default()
641 static struct elevator_type *elevator_get_by_features(struct request_queue *q)  in elevator_get_by_features()  argument
649 					 q->required_elevator_features)) {  in elevator_get_by_features()
668 void elevator_init_mq(struct request_queue *q)  in elevator_init_mq()  argument
673 	if (!elv_support_iosched(q))  in elevator_init_mq()
676 	WARN_ON_ONCE(test_bit(QUEUE_FLAG_REGISTERED, &q->queue_flags));  in elevator_init_mq()
678 	if (unlikely(q->elevator))  in elevator_init_mq()
681 	if (!q->required_elevator_features)  in elevator_init_mq()
682 		e = elevator_get_default(q);  in elevator_init_mq()
684 		e = elevator_get_by_features(q);  in elevator_init_mq()
688 	blk_mq_freeze_queue(q);  in elevator_init_mq()
689 	blk_mq_quiesce_queue(q);  in elevator_init_mq()
691 	err = blk_mq_init_sched(q, e);  in elevator_init_mq()
693 	blk_mq_unquiesce_queue(q);  in elevator_init_mq()
694 	blk_mq_unfreeze_queue(q);  in elevator_init_mq()
710 static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)  in elevator_switch()  argument
714 	lockdep_assert_held(&q->sysfs_lock);  in elevator_switch()
716 	blk_mq_freeze_queue(q);  in elevator_switch()
717 	blk_mq_quiesce_queue(q);  in elevator_switch()
719 	err = elevator_switch_mq(q, new_e);  in elevator_switch()
721 	blk_mq_unquiesce_queue(q);  in elevator_switch()
722 	blk_mq_unfreeze_queue(q);  in elevator_switch()
730 static int __elevator_change(struct request_queue *q, const char *name)  in __elevator_change()  argument
736 	if (!blk_queue_registered(q))  in __elevator_change()
743 		if (!q->elevator)  in __elevator_change()
745 		return elevator_switch(q, NULL);  in __elevator_change()
749 	e = elevator_get(q, strstrip(elevator_name), true);  in __elevator_change()
753 	if (q->elevator &&  in __elevator_change()
754 	    elevator_match(q->elevator->type, elevator_name, 0)) {  in __elevator_change()
759 	return elevator_switch(q, e);  in __elevator_change()
762 ssize_t elv_iosched_store(struct request_queue *q, const char *name,  in elv_iosched_store()  argument
767 	if (!queue_is_mq(q) || !elv_support_iosched(q))  in elv_iosched_store()
770 	ret = __elevator_change(q, name);  in elv_iosched_store()
777 ssize_t elv_iosched_show(struct request_queue *q, char *name)  in elv_iosched_show()  argument
779 	struct elevator_queue *e = q->elevator;  in elv_iosched_show()
784 	if (!queue_is_mq(q))  in elv_iosched_show()
787 	if (!q->elevator)  in elv_iosched_show()
798 		if (elv_support_iosched(q) &&  in elv_iosched_show()
800 				   q->required_elevator_features))  in elv_iosched_show()
805 	if (q->elevator)  in elv_iosched_show()
812 struct request *elv_rb_former_request(struct request_queue *q,  in elv_rb_former_request()  argument
824 struct request *elv_rb_latter_request(struct request_queue *q,  in elv_rb_latter_request()  argument