linux-kernel - Re: [PATCH v7 7/8] PCI: Enable NO_BUS

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Date:   Thu, 10 Jun 2021 18:53:19 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Shanker R Donthineni <sdonthineni@...dia.com>
Cc:     Amey Narkhede <ameynarkhede03@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        alex.williamson@...hat.com,
        Raphael Norwitz <raphael.norwitz@...anix.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        kw@...ux.com, Sinan Kaya <okaya@...nel.org>,
        Len Brown <lenb@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v7 7/8] PCI: Enable NO_BUS_RESET quirk for Nvidia GPUs

On Thu, Jun 10, 2021 at 06:43:26PM -0500, Shanker R Donthineni wrote:
> On 6/10/21 6:16 PM, Bjorn Helgaas wrote:
> >> From: Shanker Donthineni <sdonthineni@...dia.com>
> >>
> >> On select platforms, some Nvidia GPU devices do not work with SBR.
> > Interesting that you say "on select platforms."  Apparently SBR does
> > work for some of these GPUs, but not on all platforms?  If you have
> > any clarification here, I can still update the commit log.
> >
> Yes, SBR works for some GPUs but GPUs which are listed in this quirk will
> not work and these GPUs are available only on selected server platforms.
> I believe commit text reflects the issue but please update if needed. 

It sounds like there is no actual dependency on the platform.  So even
though these GPUs are only available on certain platforms, if one were
to move one of them to a different, non-supported platform, SBR would
still not work.

So I think I'll remove the reference to "select platforms" since it
doesn't add any useful information and might suggest that SBR should
work on some platforms, if you could only find the right ones.

Bjorn