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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 B164CC2D0EF for ; Mon, 30 Mar 2020 17:50:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9043020776 for ; Mon, 30 Mar 2020 17:50:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730155AbgC3Rt5 (ORCPT ); Mon, 30 Mar 2020 13:49:57 -0400 Received: from verein.lst.de ([213.95.11.211]:34955 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728903AbgC3Rty (ORCPT ); Mon, 30 Mar 2020 13:49:54 -0400 Received: by verein.lst.de (Postfix, from userid 2407) id DB2B468B05; Mon, 30 Mar 2020 19:49:50 +0200 (CEST) Date: Mon, 30 Mar 2020 19:49:50 +0200 From: "hch@lst.de" To: "Derrick, Jonathan" Cc: "helgaas@kernel.org" , "mr.nuke.me@gmail.com" , "hch@lst.de" , "Shevchenko, Andriy" , "lorenzo.pieralisi@arm.com" , "linux-kernel@vger.kernel.org" , "mika.westerberg@linux.intel.com" , "Baldysiak, Pawel" , "linux-pci@vger.kernel.org" , "lukas@wunner.de" , "okaya@kernel.org" , "kbusch@kernel.org" , "stuart.w.hayes@gmail.com" Subject: Re: [RFC 0/9] PCIe Hotplug Slot Emulation driver Message-ID: <20200330174950.GA19929@lst.de> References: <20200328215123.GA130140@google.com> <97b916ad6ad03f39ccdf5b62fe7d7b9e10190708.camel@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <97b916ad6ad03f39ccdf5b62fe7d7b9e10190708.camel@intel.com> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 30, 2020 at 05:43:33PM +0000, Derrick, Jonathan wrote: > > There's a lot of good work in here, and I don't claim to understand > > the use case and all the benefits. > I've received more info that the customer use case is an AIC that > breaks out 1-4 M.2 cards which have been made hotplug tolerant. Which sounds completely bogus. M.2 cards are eletrically not designed for this at all, and neither is the AIC. If people want to support similar use cases they need to get them standardized by PCI SIG and handled by hotplug capable slots.