From patchwork Wed Jul 12 12:54:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 702155 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 DC107EB64D9 for ; Wed, 12 Jul 2023 12:56:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232483AbjGLM42 (ORCPT ); Wed, 12 Jul 2023 08:56:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232541AbjGLM41 (ORCPT ); Wed, 12 Jul 2023 08:56:27 -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 CC6541BC9 for ; Wed, 12 Jul 2023 05:55:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1689166542; 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=PQF1B10WKGfg+P76Yk7ZVr9AG6GdrqWyQBiZqmHzAGM=; b=Kp7Kh8jGnfUfE2A+Rk4OYkHk1c3KdWsVtIg2GmqTwjLF7DsKCKCr8XNVIGsvSGhrYGjLS3 htGDduIbFemnCke5//igs68pL2t28puhk6+7HGv0OOEeAwIKO07XdSoUDxd0w/kAUf0ICa GpT1DEd2ZMefXfs4EYUqssd/xmfvitU= 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-519-yetSOoJlMSGzHUFd_mTmtg-1; Wed, 12 Jul 2023 08:55:34 -0400 X-MC-Unique: yetSOoJlMSGzHUFd_mTmtg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 437AD104458C; Wed, 12 Jul 2023 12:55:34 +0000 (UTC) Received: from localhost (ovpn-8-25.pek2.redhat.com [10.72.8.25]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6214A200B402; Wed, 12 Jul 2023 12:55:33 +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 , Jack Wang Subject: [PATCH 8/8] scsi: pm8001: take blk_mq_max_nr_hw_queues() into account for calculating io vectors Date: Wed, 12 Jul 2023 20:54:55 +0800 Message-Id: <20230712125455.1986455-9-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 10.11.54.4 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@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 kernel 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. Cc: Jack Wang Signed-off-by: Ming Lei Acked-by: Jack Wang --- drivers/scsi/pm8001/pm8001_init.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c index 2e886c1d867d..e2416f556560 100644 --- a/drivers/scsi/pm8001/pm8001_init.c +++ b/drivers/scsi/pm8001/pm8001_init.c @@ -965,6 +965,8 @@ static u32 pm8001_setup_msix(struct pm8001_hba_info *pm8001_ha) rc = pci_alloc_irq_vectors(pm8001_ha->pdev, 1, 1, PCI_IRQ_MSIX); } else { + unsigned int max_vecs = min_t(unsigned int, PM8001_MAX_MSIX_VEC, + blk_mq_max_nr_hw_queues() + 1); /* * Queue index #0 is used always for housekeeping, so don't * include in the affinity spreading. @@ -973,7 +975,7 @@ static u32 pm8001_setup_msix(struct pm8001_hba_info *pm8001_ha) .pre_vectors = 1, }; rc = pci_alloc_irq_vectors_affinity( - pm8001_ha->pdev, 2, PM8001_MAX_MSIX_VEC, + pm8001_ha->pdev, 2, max_vecs, PCI_IRQ_MSIX | PCI_IRQ_AFFINITY, &desc); }