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 58777C04AB6 for ; Fri, 31 May 2019 17:09:20 +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 CC7DB26CDD for ; Fri, 31 May 2019 17:09:19 +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="J7gr7Qgf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CC7DB26CDD 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 45FrXG1F67zDqcy for ; Sat, 1 Jun 2019 03:09:18 +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="J7gr7Qgf"; 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 45FrVx6s3xzDqCs for ; Sat, 1 Jun 2019 03:08:09 +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=KA1uUOBpqKj4QS1sNKzCJjD8A4csLtN/AKjlhA9dyZ4=; b=J7gr7QgfnGMd3RiwgTEO8jP6E ULSkOOmwWFPFnywhLdh+p2cuOeX4AQEoiphY0Ag6Z2GAfHpY6TA1iZKHiMLzXZdNrNF55KwISgO+t RFh629prGuE2WWI7iD2GrUHNv1edocH8eoxgliHN4oJ6mxDAYpMs+zmfPL5ORoDje5kc1bi1D/+YN Mne6X1vfTWc3AJh8Q7Wx+odcNye3DVIiFbQY5V0qgHQosWq/OfCKBYdl7Ttg2jDF+/TqiL5zoLAkM 4G7bVYwc15Mku1cYtcDj5/cChhYPrOUHktIJnWGJKRYerrZV01vlPz0uNkBvJKhGYQ3oGAMmcvMe0 jS18hNg6Q==; Received: from hch by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1hWl0e-0003CU-6E; Fri, 31 May 2019 17:08:04 +0000 Date: Fri, 31 May 2019 10:08:04 -0700 From: Christoph Hellwig To: Robin Murphy Subject: Re: [PATCH v3 0/6] Prerequisites for NXP LS104xA SMMU enablement Message-ID: <20190531170804.GA12211@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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <37406608-df48-c7a0-6975-4b4ad408ba36@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 06:03:30PM +0100, Robin Murphy wrote: > > The thing needs to be completely redone as it abuses parts of the > > iommu API in a completely unacceptable way. > > `git grep iommu_iova_to_phys drivers/{crypto,gpu,net}` > > :( > > I guess one alternative is for the offending drivers to maintain their own > lookup tables of mapped DMA addresses - I think at least some of these > things allow storing some kind of token in a descriptor, which even if it's > not big enough for a virtual address might be sufficient for an index. Well, we'll at least need DMA API wrappers that work on the dma addr only and hide this madness underneath. And then tell if an given device supports this and fail the probe otherwise.