From patchwork Tue Aug 8 10:42:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 711856 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 7BB80C04FDF for ; Tue, 8 Aug 2023 16:11:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229607AbjHHQLo (ORCPT ); Tue, 8 Aug 2023 12:11:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231983AbjHHQJl (ORCPT ); Tue, 8 Aug 2023 12:09:41 -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 7CD6F7A82 for ; Tue, 8 Aug 2023 08:46:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1691509567; 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=cH8+J+v5eCSEAo5zzPYOsTrKPWy+zXGNhCQOIixYmz0=; b=hEWW1uGTe+46JA2K7EtdqN8NNzv49+gZ8PjIEjr3Ukg8FDmNUNn+NLWUK/ucVmvwWNVVPD pzSedgcNk/jOHF+lP2UqsezxvEz2s1gOXDE+J1uf+7XlxHAf4YzbAZwvXCJfmyCGzK8JDY l2IRjU6HBtldgGIvlVlfBwuDX2Ps8UI= 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-694-ORIgDiMuM2yLXyVmCPXrgg-1; Tue, 08 Aug 2023 06:43:30 -0400 X-MC-Unique: ORIgDiMuM2yLXyVmCPXrgg-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 363D685CCE1; Tue, 8 Aug 2023 10:43:30 +0000 (UTC) Received: from localhost (unknown [10.72.120.3]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5FD0C140E962; Tue, 8 Aug 2023 10:43:29 +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 V3 12/14] scsi: ufs: limit max allowed nr_hw_queues Date: Tue, 8 Aug 2023 18:42:37 +0800 Message-Id: <20230808104239.146085-13-ming.lei@redhat.com> In-Reply-To: <20230808104239.146085-1-ming.lei@redhat.com> References: <20230808104239.146085-1-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 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. Signed-off-by: Ming Lei --- drivers/ufs/core/ufs-mcq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c index 6fb0e007af63..7d808836b018 100644 --- a/drivers/ufs/core/ufs-mcq.c +++ b/drivers/ufs/core/ufs-mcq.c @@ -186,7 +186,7 @@ static int ufshcd_mcq_config_nr_queues(struct ufs_hba *hba) if (!hba->nr_queues[HCTX_TYPE_DEFAULT]) hba->nr_queues[HCTX_TYPE_DEFAULT] = min3(rem, rw_queues, - num_possible_cpus()); + scsi_max_nr_hw_queues()); for (i = 0; i < HCTX_MAX_TYPES; i++) host->nr_hw_queues += hba->nr_queues[i];