linux-kernel - Re: [RFC 0/9] PCIe Hotplug Slot Emulation driver

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Date:   Mon, 10 Feb 2020 15:05:47 +0000
From:   "Derrick, Jonathan" <jonathan.derrick@...el.com>
To:     "hch@....de" <hch@....de>
CC:     "mr.nuke.me@...il.com" <mr.nuke.me@...il.com>,
        "Shevchenko, Andriy" <andriy.shevchenko@...el.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
        "helgaas@...nel.org" <helgaas@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "Baldysiak, Pawel" <pawel.baldysiak@...el.com>,
        "okaya@...nel.org" <okaya@...nel.org>,
        "kbusch@...nel.org" <kbusch@...nel.org>
Subject: Re: [RFC 0/9] PCIe Hotplug Slot Emulation driver

On Mon, 2020-02-10 at 08:01 +0100, Christoph Hellwig wrote:
> On Fri, Feb 07, 2020 at 04:59:58PM -0700, Jon Derrick wrote:
> > This set adds an emulation driver for PCIe Hotplug. There may be platforms with
> > specific configurations that can support hotplug but don't provide the logical
> > slot hotplug hardware. For instance, the platform may use an
> > electrically-tolerant interposer between the slot and the device.
> 
> The code seems like one giant hack to me.  What is the real life
> use case for this?  Another Intel chipset fuckup like vmd or the ahci
> remapping?
> 
Exactly as the cover letter describes. An interposer being used on a
non-hotplug slot.