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[v11,6/8] PCI/DPC: Update comments related to DPC recovery on NON_FATAL errors

Message ID 4f098d7d72a4454863ea4fafeccf9864969df1ea.1577400653.git.sathyanarayanan.kuppuswamy@linux.intel.com (mailing list archive)
State Superseded, archived
Delegated to: Bjorn Helgaas
Headers show
Series Add Error Disconnect Recover (EDR) support | expand

Commit Message

Kuppuswamy Sathyanarayanan Dec. 27, 2019, 12:39 a.m. UTC 
From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

Currently, in native mode, DPC driver is configured to trigger DPC only
for FATAL errors and hence it only supports port recovery for FATAL
errors. But with Error Disconnect Recover (EDR) support, DPC
configuration is done by firmware, and hence we should expect DPC
triggered for both FATAL/NON_FATAL errors. So update comments and add
details about how NON_FATAL dpc recovery is handled.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Acked-by: Keith Busch <keith.busch@intel.com>
---
 drivers/pci/pcie/dpc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index e711a3747f48..db2e5cb635d7 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -284,7 +284,11 @@  static void dpc_process_error(struct dpc_dev *dpc)
 		pci_aer_clear_fatal_status(pdev, 0);
 	}
 
-	/* We configure DPC so it only triggers on ERR_FATAL */
+	/*
+	 * Irrespective of whether the DPC event is triggered by
+	 * ERR_FATAL or ERR_NONFATAL, since the link is already down,
+	 * use the FATAL error recovery path for both cases.
+	 */
 	pcie_do_recovery(pdev, pci_channel_io_frozen, PCIE_PORT_SERVICE_DPC);
 }