From patchwork Tue Aug 8 10:42:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 13346273 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 EE7CCC001DB for ; Tue, 8 Aug 2023 16:13:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231622AbjHHQNV (ORCPT ); Tue, 8 Aug 2023 12:13:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231986AbjHHQL3 (ORCPT ); Tue, 8 Aug 2023 12:11:29 -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 D056F7D80 for ; Tue, 8 Aug 2023 08:46:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1691509580; 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=ketWVMOak+Jss00Ni7DMSRSVvfoPSxigoCA6y+QxH1E=; b=jKh6uXq7BF4zTTwBOAcr5IHI2+YE7Rufx/tWRpQ5kHAzS5C7tSxGcaqkRHY+1n4Z6u35hY 6hUFg4ol2paYTnHEthhZLYCp9df+MgU6Drsj7iOFkgDvT1ulWM/hlngoz08pdNiZkY0Usa 9rZQEkJUZhBcUVgmIu6a7wt4mxk/7xk= 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-443-MxRzmOzlP2azCBUyTJYr2w-1; Tue, 08 Aug 2023 06:43:16 -0400 X-MC-Unique: MxRzmOzlP2azCBUyTJYr2w-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E0DF880557C; Tue, 8 Aug 2023 10:43:15 +0000 (UTC) Received: from localhost (unknown [10.72.120.3]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0D5A51121314; Tue, 8 Aug 2023 10:43:14 +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 , Sreekanth Reddy , Sathya Prakash Veerichetty , Kashyap Desai , Sumit Saxena Subject: [PATCH V3 08/14] scsi: megaraid: take blk_mq_max_nr_hw_queues() into account for calculating io vectors Date: Tue, 8 Aug 2023 18:42:33 +0800 Message-Id: <20230808104239.146085-9-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 10.11.54.3 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 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: Sreekanth Reddy Cc: Sathya Prakash Veerichetty Cc: Kashyap Desai Cc: Sumit Saxena Signed-off-by: Ming Lei --- drivers/scsi/megaraid/megaraid_sas_base.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index 050eed8e2684..587ccbc1ec92 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -5921,6 +5921,10 @@ __megasas_alloc_irq_vectors(struct megasas_instance *instance) int i, irq_flags; struct irq_affinity desc = { .pre_vectors = instance->low_latency_index_start }; struct irq_affinity *descp = &desc; + unsigned max_vecs = instance->msix_vectors - instance->iopoll_q_count; + + if (max_vecs > scsi_max_nr_hw_queues()) + max_vecs = scsi_max_nr_hw_queues(); irq_flags = PCI_IRQ_MSIX; @@ -5934,7 +5938,7 @@ __megasas_alloc_irq_vectors(struct megasas_instance *instance) */ i = pci_alloc_irq_vectors_affinity(instance->pdev, instance->low_latency_index_start, - instance->msix_vectors - instance->iopoll_q_count, irq_flags, descp); + max_vecs, irq_flags, descp); return i; }