From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:44336 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757636AbdECT7M (ORCPT ); Wed, 3 May 2017 15:59:12 -0400 From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org Cc: Bart Van Assche , Omar Sandoval , Ming Lei Subject: [PATCH V2 2/5] blk-mq: introduce blk_mq_get_queue_depth() Date: Thu, 4 May 2017 03:58:36 +0800 Message-Id: <20170503195839.6539-3-ming.lei@redhat.com> In-Reply-To: <20170503195839.6539-1-ming.lei@redhat.com> References: <20170503195839.6539-1-ming.lei@redhat.com> Sender: linux-block-owner@vger.kernel.org List-Id: linux-block@vger.kernel.org The hardware queue depth can be resized via blk_mq_update_nr_requests(), so introduce this helper for retrieving queue's depth easily. Signed-off-by: Ming Lei --- block/blk-mq.c | 12 ++++++++++++ block/blk-mq.h | 1 + 2 files changed, 13 insertions(+) diff --git a/block/blk-mq.c b/block/blk-mq.c index 095099df041f..be475ad112ec 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2120,6 +2120,18 @@ static void blk_mq_map_swqueue(struct request_queue *q, } } +/* + * Queue depth can be changed via blk_mq_update_nr_requests(), + * so use this helper to retrieve queue's depth. + */ +int blk_mq_get_queue_depth(struct request_queue *q) +{ + /* All queues have same queue depth */ + struct blk_mq_tags *tags = q->tag_set->tags[0]; + + return tags->bitmap_tags.sb.depth + tags->breserved_tags.sb.depth; +} + static void queue_set_hctx_shared(struct request_queue *q, bool shared) { struct blk_mq_hw_ctx *hctx; diff --git a/block/blk-mq.h b/block/blk-mq.h index 2814a14e529c..8085d5989cf5 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -166,6 +166,7 @@ void __blk_mq_finish_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, void blk_mq_finish_request(struct request *rq); struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data, unsigned int op); +int blk_mq_get_queue_depth(struct request_queue *q); static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx) { -- 2.9.3