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Date:   Thu, 6 Dec 2018 08:45:09 +0200
From:   Leon Romanovsky <leon@kernel.org>
To:     David Gibson <david@gibson.dropbear.id.au>
Cc:     davem@davemloft.net, saeedm@mellanox.com, ogerlitz@mellanox.com,
        tariqt@mellanox.com, bhelgaas@google.com,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        netdev@vger.kernel.org, alex.williamson@redhat.com,
        linux-pci@vger.kernel.org, linux-rdma@vger.kernel.org,
        sbest@redhat.com, paulus@samba.org, benh@kernel.crashing.org
Subject: Re: [PATCH] PCI: Add no-D3 quirk for Mellanox ConnectX-[45]
Message-ID: <20181206064509.GM15544@mtr-leonro.mtl.com>
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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@gibson.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?

Thanks

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