From patchwork Fri Apr 28 15:15:37 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 9704971 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id BFEBE603F7 for ; Fri, 28 Apr 2017 15:16:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B28F22866D for ; Fri, 28 Apr 2017 15:16:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A755C28681; Fri, 28 Apr 2017 15:16:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5BA2A28683 for ; Fri, 28 Apr 2017 15:16:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751957AbdD1PQr (ORCPT ); Fri, 28 Apr 2017 11:16:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55642 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S969576AbdD1PQp (ORCPT ); Fri, 28 Apr 2017 11:16:45 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8668823E6E8; Fri, 28 Apr 2017 15:16:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 8668823E6E8 Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=ming.lei@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 8668823E6E8 Received: from localhost (ovpn-12-21.pek2.redhat.com [10.72.12.21]) by smtp.corp.redhat.com (Postfix) with ESMTP id 03AB88BC38; Fri, 28 Apr 2017 15:16:35 +0000 (UTC) From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org Cc: Christoph Hellwig , Omar Sandoval , Ming Lei Subject: [PATCH 2/4] blk-mq: introduce blk_mq_get_queue_depth() Date: Fri, 28 Apr 2017 23:15:37 +0800 Message-Id: <20170428151539.25514-3-ming.lei@redhat.com> In-Reply-To: <20170428151539.25514-1-ming.lei@redhat.com> References: <20170428151539.25514-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Fri, 28 Apr 2017 15:16:44 +0000 (UTC) Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Reviewed-by: Omar Sandoval --- 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 e530bc54f0d9..04761fb76ab4 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2637,6 +2637,18 @@ void blk_mq_free_tag_set(struct blk_mq_tag_set *set) } EXPORT_SYMBOL(blk_mq_free_tag_set); +/* + * 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; +} + int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr) { struct blk_mq_tag_set *set = q->tag_set; 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) {