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_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 320FBC43610 for ; Fri, 16 Nov 2018 09:18:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8114B2245E for ; Fri, 16 Nov 2018 09:18:19 +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="RQkTxLAU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8114B2245E 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-pci-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727543AbeKPT3o (ORCPT ); Fri, 16 Nov 2018 14:29:44 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:44600 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727398AbeKPT3o (ORCPT ); Fri, 16 Nov 2018 14:29:44 -0500 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=b5OutxS0GhcercmpX11Sg1tknmPeUT3sBqckvewo8zA=; b=RQkTxLAUFOLPA0J+RppItlpIB 9kxTGUs2y4LLsgZ8EuCtZwLQLM2MMhu1rG+qls0/zIjSoV5AvMQZPzgiAteiRkkB60IFUCQuNi2Pw Xlkg3+1gJh0u0eLVG1GBlvVINgJXch1SU9tm6k2gb1UU4C4VjPqJchEvC3CBW//wmHqqpNrnVCUgS qNM73fMXTq0i66M7gARtiW6xyn1qmMDBXKkuST/tWiT/J3p5QB4BWcOYeMJ3c0L8iMtWC6ayOEhsF Izub2bAiZd7A+UyM1hYDB1G9pfULIjbAUY5e1DPsAqS6H4e4BFXhyUa+Vxwi2DLVDE75zEZ56Mee2 I8nJ1dmew==; Received: from hch by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1gNaGK-0002Gm-Ok; Fri, 16 Nov 2018 09:18:04 +0000 Date: Fri, 16 Nov 2018 01:18:04 -0800 From: Christoph Hellwig To: Mika Westerberg Cc: Yehezkel Bernat , ashok.raj@intel.com, Mario Limonciello , michael.jamet@intel.com, Christian Kellner , rjw@rjwysocki.net, Anthony Wong , LKML , Andreas Noever , iommu@lists.linux-foundation.org, lukas@wunner.de, jacob.jun.pan@intel.com, linux-pci@vger.kernel.org, Bjorn Helgaas , linux-acpi@vger.kernel.org, David Woodhouse Subject: Re: [PATCH 1/4] PCI / ACPI: Identify external PCI devices Message-ID: <20181116091804.GA4548@infradead.org> References: <20181113112700.GT2500@lahna.fi.intel.com> <20181113114527.GA12821@e107981-ln.cambridge.arm.com> <20181115102239.GU2500@lahna.fi.intel.com> <20181115111356.GA599@e107981-ln.cambridge.arm.com> <20181115113737.GW2500@lahna.fi.intel.com> <20181115120736.pscly6zwd3k2tvd2@wunner.de> <20181115121627.GA2500@lahna.fi.intel.com> <20181115174608.GA17691@e107981-ln.cambridge.arm.com> <20181115191026.GE4179@lahna.fi.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181115191026.GE4179@lahna.fi.intel.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 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Thu, Nov 15, 2018 at 09:10:26PM +0200, Mika Westerberg wrote: > FireWire is kind of different but there are connectors such as > ExpressCard and NVMe (over U.2 connector) which carry PCIe and are > relatively easy to access without need for a screwdriver. AFAIK some > eGPUs are also using some other proprietary (non-TBT) connector that > carries PCIe. U.2 is a data center internal form factor with hot plug capability. If you enable an iommu for that by default you will make a lot of people very unhappy. More importantly NVMe is now used for the current/next generation Compact Flash and SD cards, which contain full PCIe gen 3 links.