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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70B29C35669 for ; Sun, 23 Feb 2020 02:34:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A9E9206D7 for ; Sun, 23 Feb 2020 02:34:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582425261; bh=fiow1jOLrBPF2kIgyQleElQONaYdG2nWNG10FhoHcNw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Q2vs78tdD4juiQ5xET903vRDW5g9Eq5Rvp5B5H4pV9l16q8PqJ49w5vFL4FEm/jXf IjKNRwVgvkU83Z96lowDOQ9TO1g5P+lcV2nB0SeT+iDleZBXEpnYf2hk6wqqoVDCeI yRGrf65ayNpxE9Qanb8xPD0LcHb2sT/quqIqqojc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728810AbgBWCeT (ORCPT ); Sat, 22 Feb 2020 21:34:19 -0500 Received: from mail.kernel.org ([198.145.29.99]:51498 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727227AbgBWCW3 (ORCPT ); Sat, 22 Feb 2020 21:22:29 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4A0A7214DB; Sun, 23 Feb 2020 02:22:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582424549; bh=fiow1jOLrBPF2kIgyQleElQONaYdG2nWNG10FhoHcNw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HR6Sd6yM1U29ylvrHGkf4RQ0pC78bbmGCYKA/Cr2ETl8r1e2b6CbHWiNAlJbTealw 982UOjmACc4OJUG64wXYffAMZIq1NIIS7R8wNeNCQOpLTN3VtbUfyH1HPhV/bViHsK 5J6OESOFJohtOiLdfhmFyixile15katZOKFDCvvQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nigel Kirkland , James Smart , Sagi Grimberg , Christoph Hellwig , Keith Busch , Jens Axboe , Sasha Levin , linux-nvme@lists.infradead.org Subject: [PATCH AUTOSEL 5.5 57/58] nvme: prevent warning triggered by nvme_stop_keep_alive Date: Sat, 22 Feb 2020 21:21:18 -0500 Message-Id: <20200223022119.707-57-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200223022119.707-1-sashal@kernel.org> References: <20200223022119.707-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nigel Kirkland [ Upstream commit 97b2512ad000a409b4073dd1a71e4157d76675cb ] Delayed keep alive work is queued on system workqueue and may be cancelled via nvme_stop_keep_alive from nvme_reset_wq, nvme_fc_wq or nvme_wq. Check_flush_dependency detects mismatched attributes between the work-queue context used to cancel the keep alive work and system-wq. Specifically system-wq does not have the WQ_MEM_RECLAIM flag, whereas the contexts used to cancel keep alive work have WQ_MEM_RECLAIM flag. Example warning: workqueue: WQ_MEM_RECLAIM nvme-reset-wq:nvme_fc_reset_ctrl_work [nvme_fc] is flushing !WQ_MEM_RECLAIM events:nvme_keep_alive_work [nvme_core] To avoid the flags mismatch, delayed keep alive work is queued on nvme_wq. However this creates a secondary concern where work and a request to cancel that work may be in the same work queue - namely err_work in the rdma and tcp transports, which will want to flush/cancel the keep alive work which will now be on nvme_wq. After reviewing the transports, it looks like err_work can be moved to nvme_reset_wq. In fact that aligns them better with transition into RESETTING and performing related reset work in nvme_reset_wq. Change nvme-rdma and nvme-tcp to perform err_work in nvme_reset_wq. Signed-off-by: Nigel Kirkland Signed-off-by: James Smart Reviewed-by: Sagi Grimberg Reviewed-by: Christoph Hellwig Signed-off-by: Keith Busch Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/nvme/host/core.c | 10 +++++----- drivers/nvme/host/rdma.c | 2 +- drivers/nvme/host/tcp.c | 2 +- 3 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 641c07347e8d8..ada59df642d29 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -66,8 +66,8 @@ MODULE_PARM_DESC(streams, "turn on support for Streams write directives"); * nvme_reset_wq - hosts nvme reset works * nvme_delete_wq - hosts nvme delete works * - * nvme_wq will host works such are scan, aen handling, fw activation, - * keep-alive error recovery, periodic reconnects etc. nvme_reset_wq + * nvme_wq will host works such as scan, aen handling, fw activation, + * keep-alive, periodic reconnects etc. nvme_reset_wq * runs reset works which also flush works hosted on nvme_wq for * serialization purposes. nvme_delete_wq host controller deletion * works which flush reset works for serialization. @@ -976,7 +976,7 @@ static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status) startka = true; spin_unlock_irqrestore(&ctrl->lock, flags); if (startka) - schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); + queue_delayed_work(nvme_wq, &ctrl->ka_work, ctrl->kato * HZ); } static int nvme_keep_alive(struct nvme_ctrl *ctrl) @@ -1006,7 +1006,7 @@ static void nvme_keep_alive_work(struct work_struct *work) dev_dbg(ctrl->device, "reschedule traffic based keep-alive timer\n"); ctrl->comp_seen = false; - schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); + queue_delayed_work(nvme_wq, &ctrl->ka_work, ctrl->kato * HZ); return; } @@ -1023,7 +1023,7 @@ static void nvme_start_keep_alive(struct nvme_ctrl *ctrl) if (unlikely(ctrl->kato == 0)) return; - schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); + queue_delayed_work(nvme_wq, &ctrl->ka_work, ctrl->kato * HZ); } void nvme_stop_keep_alive(struct nvme_ctrl *ctrl) diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 2a47c6c5007e1..3e85c5cacefd2 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -1088,7 +1088,7 @@ static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl) if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING)) return; - queue_work(nvme_wq, &ctrl->err_work); + queue_work(nvme_reset_wq, &ctrl->err_work); } static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc, diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index f8fa5c5b79f17..49d4373b84eb3 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -422,7 +422,7 @@ static void nvme_tcp_error_recovery(struct nvme_ctrl *ctrl) if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING)) return; - queue_work(nvme_wq, &to_tcp_ctrl(ctrl)->err_work); + queue_work(nvme_reset_wq, &to_tcp_ctrl(ctrl)->err_work); } static int nvme_tcp_process_nvme_cqe(struct nvme_tcp_queue *queue, -- 2.20.1