From patchwork Wed Jul 12 12:54:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 13310334 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8AD37EB64D9 for ; Wed, 12 Jul 2023 12:56:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232506AbjGLM4I (ORCPT ); Wed, 12 Jul 2023 08:56:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34576 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232463AbjGLM4E (ORCPT ); Wed, 12 Jul 2023 08:56:04 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D04411982 for ; Wed, 12 Jul 2023 05:55:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1689166516; 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=b8qT0SCfP03LYvevv18i58qSjcd5shmc7x0amzf2CBc=; b=E/kqzs50NpUgo+iiC+8RZ3tDy5Z+zcYtzkF9kGAkAnRsQ/5k5JyBt0OqP0NJ079lWXVGUq e2FJ+bhmZ1EHDPPj5j7W5tdLissc1RuMEXmEUgTTVJoGDZcuAceF/fla27X9Ko505R9b0A uhqHY/+fKlLSFhXKsHt7PKXHNQAxQKY= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-575-5karMAE_NmenoVqLsch49A-1; Wed, 12 Jul 2023 08:55:11 -0400 X-MC-Unique: 5karMAE_NmenoVqLsch49A-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 28C4B104D513; Wed, 12 Jul 2023 12:55:11 +0000 (UTC) Received: from localhost (ovpn-8-25.pek2.redhat.com [10.72.8.25]) by smtp.corp.redhat.com (Postfix) with ESMTP id 56A5E4067A00; Wed, 12 Jul 2023 12:15:06 +0000 (UTC) From: Ming Lei To: Jens Axboe , Christoph Hellwig , linux-nvme@lists.infradead.org, "Martin K . Petersen" , linux-scsi@vger.kernel.org Cc: linux-block@vger.kernel.org, Wen Xiong , Keith Busch , Ming Lei Subject: [PATCH 2/8] nvme-pci: use blk_mq_max_nr_hw_queues() to calculate io queues Date: Wed, 12 Jul 2023 20:54:49 +0800 Message-Id: <20230712125455.1986455-3-ming.lei@redhat.com> In-Reply-To: <20230712125455.1986455-1-ming.lei@redhat.com> References: <20230712125455.1986455-1-ming.lei@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Take blk-mq's knowledge into account for calculating io queues. Fix wrong queue mapping in case of kdump kernel. On arm and ppc64, 'maxcpus=1' is passed to kdump command line, see `Documentation/admin-guide/kdump/kdump.rst`, so num_possible_cpus() still returns all CPUs because 'maxcpus=1' just bring up one single cpu core during booting. blk-mq sees single queue in kdump kernel, and in driver's viewpoint there are still multiple queues, this inconsistency causes driver to apply wrong queue mapping for handling IO, and IO timeout is triggered. Meantime, single queue makes much less resource utilization, and reduce risk of kernel failure. Reported-by: Wen Xiong Signed-off-by: Ming Lei --- drivers/nvme/host/pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 72725729cb6c..cb13ba203956 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2247,7 +2247,7 @@ static unsigned int nvme_max_io_queues(struct nvme_dev *dev) */ if (dev->ctrl.quirks & NVME_QUIRK_SHARED_TAGS) return 1; - return num_possible_cpus() + dev->nr_write_queues + dev->nr_poll_queues; + return blk_mq_max_nr_hw_queues() + dev->nr_write_queues + dev->nr_poll_queues; } static int nvme_setup_io_queues(struct nvme_dev *dev)