linux-kernel - Re: [PATCH] PCI: xgene: Revert "PCI: xgene: Use inbound resources for setup"

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Date:   Mon, 21 Mar 2022 09:40:04 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     dann frazier <dann.frazier@...onical.com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>, robh@...nel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, Toan Le <toan@...amperecomputing.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Stéphane Graber <stgraber@...ntu.com>,
        Thorsten Leemhuis <regressions@...mhuis.info>
Subject: Re: [PATCH] PCI: xgene: Revert "PCI: xgene: Use inbound resources for setup"

On Thu, 17 Mar 2022 18:23:33 +0000,
dann frazier <dann.frazier@...onical.com> wrote:
> 
> On Thu, Mar 17, 2022 at 09:15:43AM +0000, Lorenzo Pieralisi wrote:
> > [removed CC stable]
> > 
> > On Mon, Mar 14, 2022 at 02:44:29PM +0000, Marc Zyngier wrote:
> > > Commit 6dce5aa59e0b ("PCI: xgene: Use inbound resources for setup")
> > > killed PCIe on my XGene-1 box (a Mustang board). The machine itself
> > > is still alive, but half of its storage (over NVMe) is gone, and the
> > > NVMe driver just times out.
> > > 
> > > Note that this machine boots with a device tree provided by the
> > > UEFI firmware (2016 vintage), which could well be non conformant
> > > with the spec, hence the breakage.
> > > 
> > > With the patch reverted, the box boots 5.17-rc8 with flying colors.
> > > 
> > > Signed-off-by: Marc Zyngier <maz@...nel.org>
> > > Cc: Rob Herring <robh@...nel.org>
> > > Cc: Toan Le <toan@...amperecomputing.com>
> > > Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> > > Cc: Krzysztof Wilczyński <kw@...ux.com>
> > > Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> > > Cc: Stéphane Graber <stgraber@...ntu.com>
> > > Cc: dann frazier <dann.frazier@...onical.com>
> > > Cc: Thorsten Leemhuis <regressions@...mhuis.info>
> > > Cc: stable@...r.kernel.org>
> > > ---
> > >  drivers/pci/controller/pci-xgene.c | 33 ++++++++++++++++++++----------
> > >  1 file changed, 22 insertions(+), 11 deletions(-)
> > 
> > Dann, Rob,
> > 
> > does this fix the regression debated here:
> > 
> > https://lore.kernel.org/all/Yf2wTLjmcRj+AbDv@xps13.dannf
> > 
> > It is unclear in that thread what the conclusion reached was.
> 
> Thanks for checking in Lorenzo! Reverting that patch is required but
> not sufficient to get our m400s working. In addition, we'd also need
> to revert commit c7a75d07827a ("PCI: xgene: Fix IB window setup").
> 
> I believe if we revert both then it should return us to a state where
> Marc's Mustang, Stéphane's Merlins and our m400s all work again.

Right. I'll post a series reverting both patches, which hopefully
Lorenzo and Bjorn can merge shortly.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.