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=-2.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_MUTT 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 98560C04AB6 for ; Fri, 31 May 2019 17:46:41 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 72F5A26D5D for ; Fri, 31 May 2019 17:46:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="pS2rebvu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 72F5A26D5D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=BvuLpWHbb6F5cgo6RubrS1fYceWKTS0AfytyalrO9EA=; b=pS2rebvuddVN00 JOs2nyrAR7V0aTm3fYmw3jsnOkALZ+Az8rDMfnppWXXnw2HfE73oUfQhNsgV+uPdFIBo5bNxKAVjH 0FEdG3bigoet4/BIPtC02GbN0xErwsPdwpt2ewmK/pCUdm1FhHRhz5QAHJkwm14xjtNrVJvm0lIcP HH2OxRO51cli9o/R1YMJl/544LwEl8vuQPqfq7bLHhVePsoeoiQKSTufsOelEq5eCdVmUWwoU8pnY 7I5fuBLIim2Dz6sraHpPiBwV+IS1ynL/zQyhDylwj7XyzTamv+NwD8hqqqgVyQhFK70LhObUMaJio p2cF7sVW2ahIDT2Oi2/A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hWlbt-00023H-0V; Fri, 31 May 2019 17:46:33 +0000 Received: from hch by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1hWlbq-00022N-4T; Fri, 31 May 2019 17:46:30 +0000 Date: Fri, 31 May 2019 10:46:30 -0700 From: Christoph Hellwig To: Robin Murphy Subject: Re: [PATCH v3 0/6] Prerequisites for NXP LS104xA SMMU enablement Message-ID: <20190531174629.GA6298@infradead.org> References: <20190530141951.6704-1-laurentiu.tudor@nxp.com> <20190530.150844.1826796344374758568.davem@davemloft.net> <20190531163350.GB8708@infradead.org> <37406608-df48-c7a0-6975-4b4ad408ba36@arm.com> <20190531170804.GA12211@infradead.org> <1b81c168-f5e0-f86a-f90e-22e8c3f2a602@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1b81c168-f5e0-f86a-f90e-22e8c3f2a602@arm.com> User-Agent: Mutt/1.9.2 (2017-12-15) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: madalin.bucur@nxp.com, netdev@vger.kernel.org, roy.pledge@nxp.com, linux-kernel@vger.kernel.org, leoyang.li@nxp.com, Christoph Hellwig , Joakim.Tjernlund@infinera.com, iommu@lists.linux-foundation.org, camelia.groza@nxp.com, linuxppc-dev@lists.ozlabs.org, David Miller , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, May 31, 2019 at 06:45:00PM +0100, Robin Murphy wrote: > Bleh, I'm certainly not keen on formalising any kind of > dma_to_phys()/dma_to_virt() interface for this. Or are you just proposing > something like dma_unmap_sorry_sir_the_dog_ate_my_homework() for drivers > which have 'lost' the original VA they mapped? Yes, I guess we need that in some form. I've heard a report the IBM emca ethernet driver has the same issue, and any SOC with it this totally blows up dma-debug as they just never properly unmap. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel