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

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Message-ID: <20200210070115.GA7748@lst.de>
Date:   Mon, 10 Feb 2020 08:01:15 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jon Derrick <jonathan.derrick@...el.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Pawel Baldysiak <pawel.baldysiak@...el.com>,
        Sinan Kaya <okaya@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Keith Busch <kbusch@...nel.org>,
        Alexandru Gagniuc <mr.nuke.me@...il.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [RFC 0/9] PCIe Hotplug Slot Emulation driver

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?