netdev - Re: [PATCH] PCI: Add no-D3 quirk for Mellanox ConnectX-[45]

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Message-ID: <20181211023151.GH4261@umbus.fritz.box>
Date:   Tue, 11 Dec 2018 13:31:51 +1100
From:   David Gibson <david@...son.dropbear.id.au>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     davem@...emloft.net, saeedm@...lanox.com, ogerlitz@...lanox.com,
        tariqt@...lanox.com, bhelgaas@...gle.com,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        netdev@...r.kernel.org, alex.williamson@...hat.com,
        linux-pci@...r.kernel.org, linux-rdma@...r.kernel.org,
        sbest@...hat.com, paulus@...ba.org, benh@...nel.crashing.org
Subject: Re: [PATCH] PCI: Add no-D3 quirk for Mellanox ConnectX-[45]

On Thu, Dec 06, 2018 at 08:45:09AM +0200, Leon Romanovsky wrote:
> On Thu, Dec 06, 2018 at 03:19:51PM +1100, David Gibson wrote:
> > Mellanox ConnectX-5 IB cards (MT27800) seem to cause a call trace when
> > unbound from their regular driver and attached to vfio-pci in order to pass
> > them through to a guest.
> >
> > This goes away if the disable_idle_d3 option is used, so it looks like a
> > problem with the hardware handling D3 state.  To fix that more permanently,
> > use a device quirk to disable D3 state for these devices.
> >
> > We do this by renaming the existing quirk_no_ata_d3() more generally and
> > attaching it to the ConnectX-[45] devices (0x15b3:0x1013).
> >
> > Signed-off-by: David Gibson <david@...son.dropbear.id.au>
> > ---
> >  drivers/pci/quirks.c | 17 +++++++++++------
> >  1 file changed, 11 insertions(+), 6 deletions(-)
> >
> 
> Hi David,
> 
> Thank for your patch,
> 
> I would like to reproduce the calltrace before moving forward,
> but have trouble to reproduce the original issue.
> 
> I'm working with vfio-pci and CX-4/5 cards on daily basis,
> tried manually enter into D3 state now, and it worked for me.
> 
> Can you please post your full calltrace, and "lspci -s PCI_ID -vv"
> output?

Sorry, I may have jumped the gun on this.  Using disable_idle_d3 seems
to do _something_ for these cards, but there are some other things
going wrong which are confusing the issue.  This is on POWER, which
might affect the situation.  I'll get back to you once I have some
more information.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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