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From: sathyanarayanan.kuppuswamy@linux.intel.com
To: bhelgaas@google.com
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	ashok.raj@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com
Subject: [PATCH v18 01/11] PCI/ERR: Update error status after reset_link()
Date: Mon, 23 Mar 2020 17:25:58 -0700
Message-ID: <a255fcb3a3fdebcd90f84e08b555f1786eb8eba2.1585000084.git.sathyanarayanan.kuppuswamy@linux.intel.com> (raw)
In-Reply-To: <cover.1585000084.git.sathyanarayanan.kuppuswamy@linux.intel.com>

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

Commit bdb5ac85777d ("PCI/ERR: Handle fatal error recovery") uses
reset_link() to recover from fatal errors. But during fatal error recovery,
if the initial value of error status is PCI_ERS_RESULT_DISCONNECT or
PCI_ERS_RESULT_NO_AER_DRIVER then even after successful recovery (using
reset_link()) pcie_do_recovery() will report the recovery result as
failure. So update the status of error after reset_link().

You can reproduce this issue by triggering a SW DPC using "DPC
Software Trigger" bit in "DPC Control Register". You should see recovery
failed dmesg log as below.

  pcieport 0000:00:16.0: DPC: containment event, status:0x1f27 source:0x0000
  pcieport 0000:00:16.0: DPC: software trigger detected
  pci 0000:04:00.0: AER: can't recover (no error_detected callback)
  pcieport 0000:00:16.0: AER: device recovery failed

Fixes: bdb5ac85777d ("PCI/ERR: Handle fatal error recovery")
Link: https://lore.kernel.org/r/15e702a33cc27314f9d43a06ccb408086a229cef.1583286655.git.sathyanarayanan.kuppuswamy@linux.intel.com
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Keith Busch <keith.busch@intel.com>
Cc: Ashok Raj <ashok.raj@intel.com>
---
 drivers/pci/pcie/err.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index 01dfc8bb7ca0..1ac57e9e1e71 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -203,14 +203,14 @@ void pcie_do_recovery(struct pci_dev *dev, enum pci_channel_state state,
 	bus = dev->subordinate;
 
 	pci_dbg(dev, "broadcast error_detected message\n");
-	if (state == pci_channel_io_frozen)
+	if (state == pci_channel_io_frozen) {
 		pci_walk_bus(bus, report_frozen_detected, &status);
-	else
+		status = reset_link(dev, service);
+		if (status != PCI_ERS_RESULT_RECOVERED)
+			goto failed;
+	} else {
 		pci_walk_bus(bus, report_normal_detected, &status);
-
-	if (state == pci_channel_io_frozen &&
-	    reset_link(dev, service) != PCI_ERS_RESULT_RECOVERED)
-		goto failed;
+	}
 
 	if (status == PCI_ERS_RESULT_CAN_RECOVER) {
 		status = PCI_ERS_RESULT_RECOVERED;
-- 
2.17.1


  reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-24  0:25 [PATCH v18 00/11] Add Error Disconnect Recover (EDR) support sathyanarayanan.kuppuswamy
2020-03-24  0:25 ` sathyanarayanan.kuppuswamy [this message]
2020-03-24  0:25 ` [PATCH v18 02/11] PCI: move {pciehp,shpchp}_is_native() definitions to pci.c sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 03/11] PCI/DPC: Fix DPC recovery issue in non hotplug case sathyanarayanan.kuppuswamy
2020-03-24 23:49   ` Bjorn Helgaas
2020-03-25  1:17     ` Kuppuswamy, Sathyanarayanan
2020-03-28 17:10       ` Bjorn Helgaas
2020-03-28 22:04         ` Kuppuswamy, Sathyanarayanan
2020-03-28 22:21           ` Bjorn Helgaas
2020-03-28 22:40             ` Kuppuswamy, Sathyanarayanan
2020-03-24  0:26 ` [PATCH v18 04/11] PCI/DPC: Move DPC data into struct pci_dev sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 05/11] PCI/ERR: Remove service dependency in pcie_do_recovery() sathyanarayanan.kuppuswamy
2020-03-28 21:12   ` Kuppuswamy, Sathyanarayanan
2020-03-28 21:32     ` Bjorn Helgaas
2020-03-28 21:55       ` Kuppuswamy, Sathyanarayanan
2020-03-28 22:16         ` Bjorn Helgaas
2020-03-24  0:26 ` [PATCH v18 06/11] PCI/ERR: Return status of pcie_do_recovery() sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 07/11] PCI/DPC: Cache DPC capabilities in pci_init_capabilities() sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 08/11] PCI/AER: Add pci_aer_raw_clear_status() to unconditionally clear Error Status sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 09/11] PCI/DPC: Expose dpc_process_error(), dpc_reset_link() for use by EDR sathyanarayanan.kuppuswamy
2020-03-24  0:26 ` [PATCH v18 10/11] PCI/DPC: Add Error Disconnect Recover (EDR) support sathyanarayanan.kuppuswamy
2020-03-24 21:37   ` Bjorn Helgaas
2020-03-25  1:00     ` Kuppuswamy, Sathyanarayanan
2020-03-26 22:36       ` Bjorn Helgaas
2020-03-24  0:26 ` [PATCH v18 11/11] PCI/AER: Rationalize error status register clearing sathyanarayanan.kuppuswamy
2020-03-31 15:28 ` [PATCH v18 00/11] Add Error Disconnect Recover (EDR) support Bjorn Helgaas
2020-03-31 16:28   ` Kuppuswamy, Sathyanarayanan

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