From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id ABEA0C433F5 for ; Sat, 9 Oct 2021 03:48:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9380860FD7 for ; Sat, 9 Oct 2021 03:48:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232246AbhJIDuZ (ORCPT ); Fri, 8 Oct 2021 23:50:25 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:24493 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232369AbhJIDuZ (ORCPT ); Fri, 8 Oct 2021 23:50:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1633751308; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=7G3UKlJlve/dAHeQ4aDLZgNL6CcToFOApymUAdlSpAM=; b=Zwj5dqEsp/GwXpNHT7aJYflptBseELHC+szNjs/9gMsfvK+WQsmOCwsk6XBi0GWtDWUfsl a2KH2RSptOHQi2K5euWeLIwNeQmcK5HmxyeA6pGC8mlcOdorm8p3B6r4J1y7tdUYLK4KqD 8ZFfFkmuYXBA122e4b4eOg54xBwNbDc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-554-A_lTVrghNU6S2JdWdBhHag-1; Fri, 08 Oct 2021 23:48:14 -0400 X-MC-Unique: A_lTVrghNU6S2JdWdBhHag-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D381F1006AA2; Sat, 9 Oct 2021 03:48:12 +0000 (UTC) Received: from localhost (ovpn-8-20.pek2.redhat.com [10.72.8.20]) by smtp.corp.redhat.com (Postfix) with ESMTP id E985F100763C; Sat, 9 Oct 2021 03:48:04 +0000 (UTC) From: Ming Lei To: Jens Axboe , Christoph Hellwig , linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, Chaitanya Kulkarni Cc: Sagi Grimberg , Keith Busch , Bart Van Assche , Ming Lei Subject: [PATCH V3 4/6] nvme: paring quiesce/unquiesce Date: Sat, 9 Oct 2021 11:47:11 +0800 Message-Id: <20211009034713.1489183-5-ming.lei@redhat.com> In-Reply-To: <20211009034713.1489183-1-ming.lei@redhat.com> References: <20211009034713.1489183-1-ming.lei@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org The current blk_mq_quiesce_queue() and blk_mq_unquiesce_queue() always stops and starts the queue unconditionally. And there can be concurrent quiesce/unquiesce coming from different unrelated code paths, so unquiesce may come unexpectedly and start queue too early. Prepare for supporting concurrent quiesce/unquiesce from multiple contexts, so that we can address the above issue. NVMe has very complicated quiesce/unquiesce use pattern, add one atomic bit for makeiing sure that blk-mq quiece/unquiesce is always called in pair. Signed-off-by: Ming Lei --- drivers/nvme/host/core.c | 12 ++++++++---- drivers/nvme/host/nvme.h | 2 ++ 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 23fb746a8970..4391760e2e9a 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -4452,12 +4452,14 @@ EXPORT_SYMBOL_GPL(nvme_init_ctrl); static void nvme_start_ns_queue(struct nvme_ns *ns) { - blk_mq_unquiesce_queue(ns->queue); + if (test_and_clear_bit(NVME_NS_STOPPED, &ns->flags)) + blk_mq_unquiesce_queue(ns->queue); } static void nvme_stop_ns_queue(struct nvme_ns *ns) { - blk_mq_quiesce_queue(ns->queue); + if (!test_and_set_bit(NVME_NS_STOPPED, &ns->flags)) + blk_mq_quiesce_queue(ns->queue); } /* @@ -4575,13 +4577,15 @@ EXPORT_SYMBOL_GPL(nvme_start_queues); void nvme_stop_admin_queue(struct nvme_ctrl *ctrl) { - blk_mq_quiesce_queue(ctrl->admin_q); + if (!test_and_set_bit(NVME_CTRL_ADMIN_Q_STOPPED, &ctrl->flags)) + blk_mq_quiesce_queue(ctrl->admin_q); } EXPORT_SYMBOL_GPL(nvme_stop_admin_queue); void nvme_start_admin_queue(struct nvme_ctrl *ctrl) { - blk_mq_unquiesce_queue(ctrl->admin_q); + if (test_and_clear_bit(NVME_CTRL_ADMIN_Q_STOPPED, &ctrl->flags)) + blk_mq_unquiesce_queue(ctrl->admin_q); } EXPORT_SYMBOL_GPL(nvme_start_admin_queue); diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 47877a5f1515..0fa6fa22f088 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -336,6 +336,7 @@ struct nvme_ctrl { int nr_reconnects; unsigned long flags; #define NVME_CTRL_FAILFAST_EXPIRED 0 +#define NVME_CTRL_ADMIN_Q_STOPPED 1 struct nvmf_ctrl_options *opts; struct page *discard_page; @@ -457,6 +458,7 @@ struct nvme_ns { #define NVME_NS_ANA_PENDING 2 #define NVME_NS_FORCE_RO 3 #define NVME_NS_READY 4 +#define NVME_NS_STOPPED 5 struct cdev cdev; struct device cdev_device; -- 2.31.1