linux-kernel - [PATCH v9 6/8] PCI/DPC: Update comments related to DPC recovery on NON

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Message-Id: <e9d8a8f9b0af89365b0cc96367c126a204540d0d.1570145778.git.sathyanarayanan.kuppuswamy@linux.intel.com>
Date:   Thu,  3 Oct 2019 16:39:02 -0700
From:   sathyanarayanan.kuppuswamy@...ux.intel.com
To:     bhelgaas@...gle.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        ashok.raj@...el.com, keith.busch@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: [PATCH v9 6/8] PCI/DPC: Update comments related to DPC recovery on NON_FATAL errors

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

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index a8b634e05694..fafc55c00fe0 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -275,7 +275,11 @@ static void dpc_process_error(struct dpc_dev *dpc)
 		pci_aer_clear_fatal_status(pdev);
 	}
 
-	/* 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);
 }
 
-- 
2.21.0