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Subject: Re: [PATCH] PCI: Add no-D3 quirk for Mellanox ConnectX-[45]
To:     Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        David Gibson <david@gibson.dropbear.id.au>
Cc:     Jason Gunthorpe <jgg@ziepe.ca>, Leon Romanovsky <leon@kernel.org>,
        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
References: <20181206041951.22413-1-david@gibson.dropbear.id.au>
 <20181206064509.GM15544@mtr-leonro.mtl.com>
 <20190104034401.GA2801@umbus.fritz.box> <20190105175116.GB14238@ziepe.ca>
 <c1296ee9120a6a04dc75d0fdb2a641c722cb65d6.camel@kernel.crashing.org>
 <20190108040129.GE5336@ziepe.ca>
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 <20190109053045.GE6682@umbus.fritz.box>
 <23e44611-7eec-b57c-c5a0-6c3b96133a9e@ozlabs.ru>
 <1cf957e55f9587cb5aba557d0e723deaa5358fe1.camel@kernel.crashing.org>
From:   Alexey Kardashevskiy <aik@ozlabs.ru>
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Date:   Wed, 9 Jan 2019 19:14:25 +1100
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On 09/01/2019 18:25, Benjamin Herrenschmidt wrote:
> On Wed, 2019-01-09 at 17:32 +1100, Alexey Kardashevskiy wrote:
>> I have just moved the "Mellanox Technologies MT27700 Family
>> [ConnectX-4]" from garrison to firestone machine and there it does not
>> produce an EEH, with the same kernel and skiboot (both upstream + my
>> debug). Hm. I cannot really blame the card but I cannot see what could
>> cause the difference in skiboot either. I even tried disabling NPU so
>> garrison would look like firestone, still EEH'ing.
> 
> The systems have a different chip though, firestone is P8 and garrison
> is P8', which a slightly different PHB revision. Worth checking if we
> have anything significantly different in our inits and poke at the HW
> guys.

Nope, we do not have anything different for these machines. Asking HW
guys never worked for me :-/

I think the easiest is just doing what we did for PHB4 and ignoring
these D3 requests on garrisons.


> BTW. Are the cards behind a switch in either case ?


No, directly connected to the root on both:

garrison:

0000:00:00.0 PCI bridge: IBM Device 03dc (rev ff)
0000:01:00.0 Ethernet controller: Mellanox Technologies MT27700 Family
[ConnectX-4] (rev ff)
0000:01:00.1 Ethernet controller: Mellanox Technologies MT27700 Family
[ConnectX-4] (rev ff)

firestone (phb #0 is taken by nvidia gpu):

0001:00:00.0 PCI bridge: IBM POWER8 Host Bridge (PHB3)
0001:01:00.0 Ethernet controller: Mellanox Technologies MT27700 Family
[ConnectX-4]
0001:01:00.1 Ethernet controller: Mellanox Technologies MT27700 Family
[ConnectX-4]


-- 
Alexey