From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 46490A00E6 for ; Tue, 9 Jul 2019 10:39:58 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id E336A1B959; Tue, 9 Jul 2019 10:39:57 +0200 (CEST) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id 43D631B958 for ; Tue, 9 Jul 2019 10:39:56 +0200 (CEST) X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jul 2019 01:39:55 -0700 X-IronPort-AV: E=Sophos;i="5.63,470,1557212400"; d="scan'208";a="159391541" Received: from bricha3-mobl.ger.corp.intel.com ([10.251.95.59]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jul 2019 01:39:53 -0700 Date: Tue, 9 Jul 2019 09:39:50 +0100 From: Bruce Richardson To: Jerin Jacob Kollanukkaran Cc: David Marchand , dev , Thomas Monjalon , Ben Walker , "Burakov, Anatoly" Message-ID: <20190709083950.GA485@bricha3-MOBL.ger.corp.intel.com> References: <20190708142450.51597-1-jerinj@marvell.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.11.4 (2019-03-13) Subject: Re: [dpdk-dev] [EXT] Re: [PATCH] bus/pci: fix IOVA as VA mode selection X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On Mon, Jul 08, 2019 at 07:13:28PM +0000, Jerin Jacob Kollanukkaran wrote: > See below, > > Please send the email as text to avoid formatting issue.(No HTML) > > From: David Marchand > Sent: Tuesday, July 9, 2019 12:09 AM > To: Jerin Jacob Kollanukkaran > Cc: dev ; Thomas Monjalon ; Ben Walker ; Burakov, Anatoly > Subject: [EXT] Re: [dpdk-dev] [PATCH] bus/pci: fix IOVA as VA mode selection > > ________________________________________ > > On Mon, Jul 8, 2019 at 4:25 PM wrote: > From: Jerin Jacob > > Existing logic fails to select IOVA mode as VA > if driver request to enable IOVA as VA. > > IOVA as VA has more strict requirement than other modes, > so enabling positive logic for IOVA as VA selection. > > This patch also updates the default IOVA mode as PA > for PCI devices as it has to deal with DMA engines unlike > the virtual devices that may need only IOVA as DC. > > We have three cases: > - driver/hw supports IOVA as PA only > > [Jerin] It is not driver cap, it is more of system cap(IOMMU vs non IOMMU). We are already addressing that case > Not necessarily. It's possible to have hardware that does not use the IOMMU on a platform. Therefore, you have more than two options to support. /Bruce