From: Kai-Heng Feng <kai.heng.feng@canonical.com>
To: bhelgaas@google.com
Cc: mika.westerberg@linux.intel.com, koba.ko@canonical.com,
baolu.lu@linux.intel.com,
sathyanarayanan.kuppuswamy@linux.intel.com,
Kai-Heng Feng <kai.heng.feng@canonical.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: [PATCH v3 1/2] PCI/AER: Disable AER service when link is in L2/L3 ready, L2 and L3 state
Date: Tue, 29 Mar 2022 16:31:28 +0800 [thread overview]
Message-ID: <20220329083130.817316-1-kai.heng.feng@canonical.com> (raw)
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
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
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,
};
/**
--
2.34.1
next reply other threads:[~2022-03-29 8:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-29 8:31 Kai-Heng Feng [this message]
2022-03-29 8:31 ` [PATCH v3 2/2] PCI/DPC: Disable DPC service when link is in L2/L3 ready, L2 and L3 state 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
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