From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0B6FC32771 for ; Wed, 22 Jan 2020 04:39:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9BB4824656 for ; Wed, 22 Jan 2020 04:39:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729098AbgAVEjD (ORCPT ); Tue, 21 Jan 2020 23:39:03 -0500 Received: from mga02.intel.com ([134.134.136.20]:23482 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726605AbgAVEjD (ORCPT ); Tue, 21 Jan 2020 23:39:03 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Jan 2020 20:39:03 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,348,1574150400"; d="scan'208";a="215779176" Received: from allen-box.sh.intel.com (HELO [10.239.159.138]) ([10.239.159.138]) by orsmga007.jf.intel.com with ESMTP; 21 Jan 2020 20:39:01 -0800 Cc: baolu.lu@linux.intel.com, iommu@lists.linux-foundation.org, Christoph Hellwig , Keith Busch , Joerg Roedel , David Woodhouse Subject: Re: [PATCH v5 4/7] iommu/vt-d: Use pci_real_dma_dev() for mapping To: Jon Derrick , linux-pci@vger.kernel.org, Bjorn Helgaas , Lorenzo Pieralisi References: <1579613871-301529-1-git-send-email-jonathan.derrick@intel.com> <1579613871-301529-5-git-send-email-jonathan.derrick@intel.com> From: Lu Baolu Message-ID: Date: Wed, 22 Jan 2020 12:37:32 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <1579613871-301529-5-git-send-email-jonathan.derrick@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On 1/21/20 9:37 PM, Jon Derrick wrote: > The PCI device may have a DMA requester on another bus, such as VMD > subdevices needing to use the VMD endpoint. This case requires the real > DMA device when mapping to IOMMU. > > Signed-off-by: Jon Derrick Acked-by: Lu Baolu Thanks, baolu