From: Kai-Heng Feng <kai.heng.feng@canonical.com>
To: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc: bhelgaas@google.com, mika.westerberg@linux.intel.com,
koba.ko@canonical.com, baolu.lu@linux.intel.com,
Russell Currey <ruscur@russell.cc>,
"Oliver O'Halloran" <oohall@gmail.com>,
linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/2] PCI/AER: Disable AER service when link is in L2/L3 ready, L2 and L3 state
Date: Fri, 8 Apr 2022 19:26:06 +0800 [thread overview]
Message-ID: <CAAd53p50sW8GsetxisisNXM3FTZf73GCPnRXAqYysckKzw_SqQ@mail.gmail.com> (raw)
In-Reply-To: <009c9c14-7669-9750-a787-1d220414423e@linux.intel.com>
On Thu, Mar 31, 2022 at 3:40 AM Sathyanarayanan Kuppuswamy
<sathyanarayanan.kuppuswamy@linux.intel.com> wrote:
>
>
>
> On 3/29/22 1:31 AM, Kai-Heng Feng wrote:
> > On some Intel AlderLake platforms, Thunderbolt entering D3cold can cause
> > some errors reported by AER:
> > [ 30.100211] pcieport 0000:00:1d.0: AER: Uncorrected (Non-Fatal) error received: 0000:00:1d.0
> > [ 30.100251] pcieport 0000:00:1d.0: PCIe Bus Error: severity=Uncorrected (Non-Fatal), type=Transaction Layer, (Requester ID)
> > [ 30.100256] pcieport 0000:00:1d.0: device [8086:7ab0] error status/mask=00100000/00004000
> > [ 30.100262] pcieport 0000:00:1d.0: [20] UnsupReq (First)
> > [ 30.100267] pcieport 0000:00:1d.0: AER: TLP Header: 34000000 08000052 00000000 00000000
> > [ 30.100372] thunderbolt 0000:0a:00.0: AER: can't recover (no error_detected callback)
> > [ 30.100401] xhci_hcd 0000:3e:00.0: AER: can't recover (no error_detected callback)
> > [ 30.100427] pcieport 0000:00:1d.0: AER: device recovery failed
>
> Include details about in which platform you have seen it and whether
> this is a generic power issue?
_All_ Alder Lake platforms I worked on have this issue. I don't think
have hardware to analyze if it's a power issue though.
>
> >
> > So disable AER service to avoid the noises from turning power rails
> > on/off when the device is in low power states (D3hot and D3cold), as
> > PCIe spec "5.2 Link State Power Management" states that TLP and DLLP
>
> Also include PCIe specification version number.
Will add in next revision.
Kai-Heng
>
> > transmission is disabled for a Link in L2/L3 Ready (D3hot), L2 (D3cold
> > with aux power) and L3 (D3cold).
> >
> > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215453
> > Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> > ---
> > v3:
> > - Remove reference to ACS.
> > - Wording change.
> >
> > v2:
> > - Wording change.
> >
> > drivers/pci/pcie/aer.c | 31 +++++++++++++++++++++++++------
> > 1 file changed, 25 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> > index 9fa1f97e5b270..e4e9d4a3098d7 100644
> > --- a/drivers/pci/pcie/aer.c
> > +++ b/drivers/pci/pcie/aer.c
> > @@ -1367,6 +1367,22 @@ static int aer_probe(struct pcie_device *dev)
> > return 0;
> > }
> >
> > +static int aer_suspend(struct pcie_device *dev)
> > +{
> > + struct aer_rpc *rpc = get_service_data(dev);
> > +
> > + aer_disable_rootport(rpc);
> > + return 0;
> > +}
> > +
> > +static int aer_resume(struct pcie_device *dev)
> > +{
> > + struct aer_rpc *rpc = get_service_data(dev);
> > +
> > + aer_enable_rootport(rpc);
> > + return 0;
> > +}
> > +
> > /**
> > * aer_root_reset - reset Root Port hierarchy, RCEC, or RCiEP
> > * @dev: pointer to Root Port, RCEC, or RCiEP
> > @@ -1433,12 +1449,15 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
> > }
> >
> > static struct pcie_port_service_driver aerdriver = {
> > - .name = "aer",
> > - .port_type = PCIE_ANY_PORT,
> > - .service = PCIE_PORT_SERVICE_AER,
> > -
> > - .probe = aer_probe,
> > - .remove = aer_remove,
> > + .name = "aer",
> > + .port_type = PCIE_ANY_PORT,
> > + .service = PCIE_PORT_SERVICE_AER,
> > + .probe = aer_probe,
> > + .suspend = aer_suspend,
> > + .resume = aer_resume,
> > + .runtime_suspend = aer_suspend,
> > + .runtime_resume = aer_resume,
> > + .remove = aer_remove,
> > };
> >
> > /**
>
> --
> Sathyanarayanan Kuppuswamy
> Linux Kernel Developer
prev parent reply other threads:[~2022-04-08 11:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-29 8:31 [PATCH v3 1/2] PCI/AER: Disable AER service when link is in L2/L3 ready, L2 and L3 state Kai-Heng Feng
2022-03-29 8:31 ` [PATCH v3 2/2] PCI/DPC: Disable DPC " Kai-Heng Feng
2022-03-30 19:40 ` [PATCH v3 1/2] PCI/AER: Disable AER " Sathyanarayanan Kuppuswamy
2022-04-08 11:26 ` Kai-Heng Feng [this message]
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