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=-2.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_MUTT autolearn=unavailable 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 EDFCCC04AB6 for ; Fri, 31 May 2019 17:47:51 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 71B0726D4A for ; Fri, 31 May 2019 17:47:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="OcvvfIQW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 71B0726D4A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 45FsNj6zBrzDqfZ for ; Sat, 1 Jun 2019 03:47:49 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=bombadil.srs.infradead.org (client-ip=2607:7c80:54:e::133; helo=bombadil.infradead.org; envelope-from=batv+1238baab1fee290d454e+5759+infradead.org+hch@bombadil.srs.infradead.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=infradead.org header.i=@infradead.org header.b="OcvvfIQW"; dkim-atps=neutral Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 45FsMK2NqVzDqd7 for ; Sat, 1 Jun 2019 03:46:36 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=sw59L5eilDcyLax1cbN/oovEq+2iPQ87MItZHDnliB8=; b=OcvvfIQWRmhZciRaxx8x6dnj7 P9/7pUyMmERrI8OtitGh0I1lua9/boy6cCyy8Ladvj3L+81QcfLZA3/MpAXnqBYWumQ7OwxjHJzyW dYcTgnoubni9ek4e+t2NdyFiporyzaIlnP+Sqtx7nVnm4QpWkErFIuu3c//DEmHtOceqwmRR+TleY 5xdn+M5QVBRJydb756QKcrm2LYNcpari+BbBMzfF1a1qnRAOkMBtY1ouzqY7uu11IRMQ992tj+IwH kTGIKLKzrT0G7yIOK0n8A8VlEo0R3dSDvfZe6tdSfdipO9HLYIyRazJqOFjrnnt5KR1OHdtFysfhd 5WgaU7K6g==; 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-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1b81c168-f5e0-f86a-f90e-22e8c3f2a602@arm.com> User-Agent: Mutt/1.9.2 (2017-12-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List 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 , iommu@lists.linux-foundation.org, camelia.groza@nxp.com, linuxppc-dev@lists.ozlabs.org, David Miller , linux-arm-kernel@lists.infradead.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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.