linux-kernel - Re: [PATCH RFC v2 4/4] PCI: hotplug: Add quirk For Dell nvme pcie switches

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Date:   Fri, 22 Feb 2019 19:19:10 +0000
From:   <Alex_Gagniuc@...lteam.com>
To:     <oohall@...il.com>
Cc:     <lukas@...ner.de>, <mr.nuke.me@...il.com>, <bhelgaas@...gle.com>,
        <Austin.Bolen@...l.com>, <keith.busch@...el.com>,
        <Shyam.Iyer@...l.com>, <okaya@...nel.org>,
        <linux-pci@...r.kernel.org>, <mika.westerberg@...ux.intel.com>,
        <okaya@...eaurora.org>, <poza@...eaurora.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC v2 4/4] PCI: hotplug: Add quirk For Dell nvme pcie
 switches

On 2/21/19 8:05 PM, Oliver wrote:
> On Fri, Feb 22, 2019 at 5:38 AM <Alex_Gagniuc@...lteam.com> wrote:
>> On 2/21/19 1:57 AM, Lukas Wunner wrote:
[snip]
>>> If the quirk is x86-specific, please enclose it in "#ifdef CONFIG_X86"
>>> to reduce kernel footprint on other arches.
>>
>> That's a tricky one. If you look at p. 185 of [1], items 9, 11, and 12
>> are standard x16 cards that would fit in any x16 slot. Those cards have
>> the offending switches.
>>
>> On the one hand, you could take the cards and backplane and put them in
>> a non-hax86 system. On the other hand, I don't see why someone would
>> want to do this.
> 
> I have a couple of POWER boxes with Dell branded switch cards in them.
> I have no idea why either, but it does happen.

The hardware debouncer, I think, is on the backplane, so you'd really 
need both the switch and backplane combo. I've seen other marketing 
departments call the switches "NVMe HBA".

Alex