linux-kernel - [PATCH v13 6/8] PCI/DPC: Update comments related to DPC recovery on NON

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Message-Id: <3ee62d75a2953a6435bebcc806a70fd5a3ecbe57.1579406227.git.sathyanarayanan.kuppuswamy@linux.intel.com>
Date:   Sat, 18 Jan 2020 20:00:35 -0800
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, sathyanarayanan.kuppuswamy@...ux.intel.com,
        Keith Busch <keith.busch@...el.com>
Subject: [PATCH v13 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 bb237af8dac1..97eb032f9a29 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_err_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