Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Cc:     <lukas@wunner.de>, <mr.nuke.me@gmail.com>, <bhelgaas@google.com>,
        <Austin.Bolen@dell.com>, <keith.busch@intel.com>,
        <Shyam.Iyer@dell.com>, <okaya@kernel.org>,
        <linux-pci@vger.kernel.org>, <mika.westerberg@linux.intel.com>,
        <okaya@codeaurora.org>, <poza@codeaurora.org>,
        <linux-kernel@vger.kernel.org>
From:   <Alex_Gagniuc@Dellteam.com>
To:     <oohall@gmail.com>
Subject: Re: [PATCH RFC v2 4/4] PCI: hotplug: Add quirk For Dell nvme pcie
 switches
Thread-Topic: [PATCH RFC v2 4/4] PCI: hotplug: Add quirk For Dell nvme pcie
 switches
Thread-Index: AQHUyLqRKxehBZutlk6MputMunrGNg==
Date:   Fri, 22 Feb 2019 19:19:10 +0000
Message-ID: <747feb2ef93c4c5e97813232904de829@ausx13mps321.AMER.DELL.COM>
References: <20190220012031.10741-1-mr.nuke.me@gmail.com>
 <20190220012031.10741-5-mr.nuke.me@gmail.com>
 <20190221075634.uih5ysqwkna7cku4@wunner.de>
 <027101b4652c4e0c98b86649aa3e4732@ausx13mps321.AMER.DELL.COM>
 <CAOSf1CGqKePUE7Z9R3ojX6Ba_RxsdS7Y2rHONzbZNPNti8MtwQ@mail.gmail.com>
Accept-Language: en-US
Content-Language: en-US
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 2/21/19 8:05 PM, Oliver wrote:=0A=
> On Fri, Feb 22, 2019 at 5:38 AM <Alex_Gagniuc@dellteam.com> wrote:=0A=
>> On 2/21/19 1:57 AM, Lukas Wunner wrote:=0A=
[snip]=0A=
>>> If the quirk is x86-specific, please enclose it in "#ifdef CONFIG_X86"=
=0A=
>>> to reduce kernel footprint on other arches.=0A=
>>=0A=
>> That's a tricky one. If you look at p. 185 of [1], items 9, 11, and 12=
=0A=
>> are standard x16 cards that would fit in any x16 slot. Those cards have=
=0A=
>> the offending switches.=0A=
>>=0A=
>> On the one hand, you could take the cards and backplane and put them in=
=0A=
>> a non-hax86 system. On the other hand, I don't see why someone would=0A=
>> want to do this.=0A=
> =0A=
> I have a couple of POWER boxes with Dell branded switch cards in them.=0A=
> I have no idea why either, but it does happen.=0A=
=0A=
The hardware debouncer, I think, is on the backplane, so you'd really =0A=
need both the switch and backplane combo. I've seen other marketing =0A=
departments call the switches "NVMe HBA".=0A=
=0A=
Alex=0A=