linux-kernel - Re: [PATCH V10 2/3] PCI: handle CRS returned by device after FLR

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Message-ID: <20170823200111.GF8498@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 23 Aug 2017 15:01:11 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Sinan Kaya <okaya@...eaurora.org>
Cc:     linux-pci@...r.kernel.org, timur@...eaurora.org,
        alex.williamson@...hat.com, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V10 2/3] PCI: handle CRS returned by device after FLR

On Tue, Aug 22, 2017 at 11:21:24PM -0400, Sinan Kaya wrote:
> On 8/21/2017 2:00 PM, Bjorn Helgaas wrote:
> > On Mon, Aug 21, 2017 at 09:44:09AM -0400, Sinan Kaya wrote:
> >> Hi Bjorn,
> >>
> >> On 8/18/2017 5:01 PM, Bjorn Helgaas wrote:
> 
> > 
> > It would still be interesting to see the lspci output.  Likely <MAbort
> > in the upstream bridge will be set even before the FLR because of
> > aborts during enumeration.  The PCI core should probably clear that
> > after enumeration.  I expect that if you manually clear it with
> > setpci, do the lspci, do the FLR, do another lspci, you will probably
> > see <MAbort being set by this pci_flr_wait() loop.  We might want to
> > consider clearing it here as well.
> 
> 
>      Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>         Latency: 0
>         Interrupt: pin A routed to IRQ 345
>         Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
>         I/O behind bridge: 00002000-00002fff
>         Memory behind bridge: 00100000-002fffff
>         Prefetchable memory behind bridge: 0000090400000000-00000904001fffff
>         Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
> 
> FLR reset here with CRS to the NVMe drive.
> 	
>      Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>         Latency: 0
>         Interrupt: pin A routed to IRQ 345
>         Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
>         I/O behind bridge: 00002000-00002fff
>         Memory behind bridge: 00100000-002fffff
>         Prefetchable memory behind bridge: 0000090400000000-00000904001fffff
>         Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
> 	
> I don't see <MAbort getting set. 

Thanks for checking.  One of the many things I don't understand, I guess.