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 Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A5EA8C433F5 for ; Wed, 6 Apr 2022 15:47:34 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id 4BC1940517; Wed, 6 Apr 2022 15:47:34 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ha3SuJde-2uL; Wed, 6 Apr 2022 15:47:33 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp2.osuosl.org (Postfix) with ESMTPS id 587B240141; Wed, 6 Apr 2022 15:47:33 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 412DFC001D; Wed, 6 Apr 2022 15:47:33 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [IPv6:2605:bc80:3010::136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 19A01C0012; Wed, 6 Apr 2022 15:47:32 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id EBDBF60ED4; Wed, 6 Apr 2022 15:47:31 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id L7uIe2sd9maI; Wed, 6 Apr 2022 15:47:31 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.8.0 X-Greylist: from auto-whitelisted by SQLgrey-1.8.0 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by smtp3.osuosl.org (Postfix) with ESMTPS id 59B8960ECB; Wed, 6 Apr 2022 15:47:31 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 4C5E168AFE; Wed, 6 Apr 2022 17:47:24 +0200 (CEST) Date: Wed, 6 Apr 2022 17:47:23 +0200 From: Christoph Hellwig To: Jason Gunthorpe Subject: Re: [PATCH 1/5] iommu: Replace uses of IOMMU_CAP_CACHE_COHERENCY with dev_is_dma_coherent() Message-ID: <20220406154723.GA30153@lst.de> References: <0-v1-ef02c60ddb76+12ca2-intel_no_snoop_jgg@nvidia.com> <1-v1-ef02c60ddb76+12ca2-intel_no_snoop_jgg@nvidia.com> <20220406053039.GA10580@lst.de> <20220406120730.GA2120790@nvidia.com> <20220406135150.GA21532@lst.de> <20220406141446.GE2120790@nvidia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220406141446.GE2120790@nvidia.com> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: Nelson Escobar , "Michael S. Tsirkin" , Jason Wang , virtualization@lists.linux-foundation.org, Will Deacon , Christoph Hellwig , linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-rdma@vger.kernel.org, Gerald Schaefer , David Woodhouse , "Tian, Kevin" , linux-arm-msm@vger.kernel.org, Alex Williamson , linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, Cornelia Huck , iommu@lists.linux-foundation.org, Christian Benvenuti , Robin Murphy X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Wed, Apr 06, 2022 at 11:14:46AM -0300, Jason Gunthorpe wrote: > Really? It is the only condition that dma_info_to_prot() tests to > decide of IOMMU_CACHE is used or not, so you are saying that there is > a condition where a device can be attached to an iommu_domain and > dev_is_dma_coherent() returns the wrong information? How does > dma-iommu.c safely use it then? arm does not use dma-iommu.c _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu