From: Bjorn Helgaas <helgaas@kernel.org>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: linux1394-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
edmund.raile@proton.me,
Takashi Sakamoto <o-takashi@sakamocchi.jp>
Subject: Re: [PATCH v2] PCI: Mark LSI FW643 to avoid bus reset
Date: Thu, 28 Mar 2024 16:06:46 -0500 [thread overview]
Message-ID: <20240328210646.GA1581782@bhelgaas> (raw)
In-Reply-To: <20240328144201.510f6d5e.alex.williamson@redhat.com>
On Thu, Mar 28, 2024 at 02:42:01PM -0600, Alex Williamson wrote:
> On Wed, 27 Mar 2024 10:01:19 -0500
> Bjorn Helgaas <helgaas@kernel.org> wrote:
>
> > On Tue, Mar 26, 2024 at 10:18:58PM +0900, Takashi Sakamoto wrote:
> > > On Mon, Mar 25, 2024 at 09:41:49AM -0500, Bjorn Helgaas wrote:
> > > > So even without this patch, you are able to pass the FW643 to a VM
> > > > with VFIO, and you don't see any issues caused by VFIO resetting the
> > > > device?
> > >
> > > Absolutely yes, at least in my VM, for recent years to maintain Linux
> > > FireWire subsystem and ALSA firewire stack.
> >
> > So there must be something different between your system and Edmund's.
> > Maybe we can refine the quirk so it avoids the SBR on Edmund's system
> > but not yours.
> >
> > Can you both collect the output of "sudo lspci -vvv" so we can try to
> > figure out the difference? Also a complete dmesg log would be helpful
> > and would contain DMI information that we might need if this is
> > firmware dependent.
>
> The original patch proposed for this gave me the impression that this
> was a device used on various old Mac systems, not likely applicable to
> a general purpose plug-in card. Given the expanded use case, I'd
> suggest reverting the patch.
Makes sense, I'll queue up a revert for v6.9 so we can take some time
to figure this out.
> I think we need significantly more exhaustive testing on the afflicted
> system to understand whether this is an issue with the endpoint, the
> root port, the BIOS, etc.
>
> In the meantime, or maybe as a permanent solution, Edmund can make use
> of the reset_method interface in pci-syfs to restrict the available
> reset methods for the device rather than risk removing a reset
> mechanism identified as working by other users. My 2 cents. Thanks,
>
> Alex
>
next prev parent reply other threads:[~2024-03-28 21:06 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-26 10:25 [PATCH] PCI: Mark LSI FW643 to avoid bus reset Edmund Raile
2024-02-26 21:02 ` Bjorn Helgaas
2024-02-27 13:14 ` [PATCH v2] " Edmund Raile
2024-02-29 23:00 ` Bjorn Helgaas
2024-03-25 1:21 ` Takashi Sakamoto
2024-03-25 14:41 ` Bjorn Helgaas
2024-03-26 13:18 ` Takashi Sakamoto
2024-03-27 15:01 ` Bjorn Helgaas
2024-03-28 20:42 ` Alex Williamson
2024-03-28 21:06 ` Bjorn Helgaas [this message]
2024-03-29 4:41 ` Lukas Wunner
2024-03-29 8:12 ` Takashi Sakamoto
2024-03-29 13:37 ` Lukas Wunner
2024-03-28 18:35 ` edmund.raile
2024-03-29 8:05 ` Takashi Sakamoto
-- strict thread matches above, loose matches on Subject: below --
2024-03-30 10:14 edmund.raile
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