From patchwork Wed Jul 12 12:54:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 702157 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 6C6BBEB64DA for ; Wed, 12 Jul 2023 12:56:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232463AbjGLM4L (ORCPT ); Wed, 12 Jul 2023 08:56:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34594 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232446AbjGLM4I (ORCPT ); Wed, 12 Jul 2023 08:56:08 -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 5DAD51989 for ; Wed, 12 Jul 2023 05:55:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1689166519; 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=YJ4imw3iHzN6mbjqWrKiopdQuaapVjZy4MvSNpK4PGw=; b=Z7DiJmkRwAMTt+SBmw+KSFFHfGkuWJp74hi4k1kCfmQ0RmMO4MwUcYw0/F+Axuxu6YPhnY FIHH1Hi8k/AO39wALLKgpiqWoBfq0PNMcl6um2scxF1SirYlwJkZtDrdYCRuT2prOZtLhT /OBCKKtuNuY6orZ2RwTH46VNnYCAv8c= 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-139-V3DQFlR7NK6gTouM1E1UAg-1; Wed, 12 Jul 2023 08:55:15 -0400 X-MC-Unique: V3DQFlR7NK6gTouM1E1UAg-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id DB5AC10504AA; Wed, 12 Jul 2023 12:55:14 +0000 (UTC) Received: from localhost (ovpn-8-25.pek2.redhat.com [10.72.8.25]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0338A1454142; Wed, 12 Jul 2023 12:55:13 +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 , James Smart Subject: [PATCH 3/8] scsi: lpfc: use blk_mq_max_nr_hw_queues() to calculate io vectors Date: Wed, 12 Jul 2023 20:54:50 +0800 Message-Id: <20230712125455.1986455-4-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 10.11.54.7 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: James Smart Signed-off-by: Ming Lei --- drivers/scsi/lpfc/lpfc_init.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index 3221a934066b..88314c3f1dc1 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -13012,6 +13012,7 @@ lpfc_sli4_enable_msix(struct lpfc_hba *phba) if (phba->irq_chann_mode != NORMAL_MODE) aff_mask = &phba->sli4_hba.irq_aff_mask; + vectors = min_t(unsigned int, vectors, blk_mq_max_nr_hw_queues()); if (aff_mask) { cpu_cnt = cpumask_weight(aff_mask); vectors = min(phba->cfg_irq_chann, cpu_cnt);