linux-kernel - [PATCH v11 7/8] PCI/DPC: Clear AER registers in EDR mode

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Message-Id: <d24b1321a7b32aa8d1721d593c8fa133cdb2ad00.1577400653.git.sathyanarayanan.kuppuswamy@linux.intel.com>
Date:   Thu, 26 Dec 2019 16:39:13 -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, keith.busch@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: [PATCH v11 7/8] PCI/DPC: Clear AER registers in EDR mode

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

As per PCI firmware specification r3.2 System Firmware Intermediary
(SFI) _OSC and DPC Updates ECR
(https://members.pcisig.com/wg/PCI-SIG/document/13563), sec titled
"DPC Event Handling Implementation Note", page 10, OS is responsible
for clearing the AER registers in EDR mode. So clear AER registers in
dpc_process_error() function.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
Acked-by: Keith Busch <keith.busch@...el.com>
---
 drivers/pci/pcie/dpc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index db2e5cb635d7..588ae4f99781 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -284,6 +284,10 @@ static void dpc_process_error(struct dpc_dev *dpc)
 		pci_aer_clear_fatal_status(pdev, 0);
 	}
 
+	/* In EDR mode, OS is responsible for clearing AER registers */
+	if (pcie_aer_get_firmware_first(pdev))
+		pci_cleanup_aer_error_status_regs(pdev, 0);
+
 	/*
 	 * Irrespective of whether the DPC event is triggered by
 	 * ERR_FATAL or ERR_NONFATAL, since the link is already down,
-- 
2.21.0