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

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Date:   Mon, 30 Mar 2020 19:49:50 +0200
From:   "hch@....de" <hch@....de>
To:     "Derrick, Jonathan" <jonathan.derrick@...el.com>
Cc:     "helgaas@...nel.org" <helgaas@...nel.org>,
        "mr.nuke.me@...il.com" <mr.nuke.me@...il.com>,
        "hch@....de" <hch@....de>,
        "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>,
        "Baldysiak, Pawel" <pawel.baldysiak@...el.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "lukas@...ner.de" <lukas@...ner.de>,
        "okaya@...nel.org" <okaya@...nel.org>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "stuart.w.hayes@...il.com" <stuart.w.hayes@...il.com>
Subject: Re: [RFC 0/9] PCIe Hotplug Slot Emulation driver

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.