linux-kernel - [PATCH v4 06/15] PCI/AER: Change AER driver to read UCE fatal status for all CXL PCIe Port devices

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Message-ID: <20241211234002.3728674-7-terry.bowman@amd.com>
Date: Wed, 11 Dec 2024 17:39:53 -0600
From: Terry Bowman <terry.bowman@....com>
To: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, <nifan.cxl@...il.com>, <ming4.li@...el.com>,
	<dave@...olabs.net>, <jonathan.cameron@...wei.com>, <dave.jiang@...el.com>,
	<alison.schofield@...el.com>, <vishal.l.verma@...el.com>,
	<dan.j.williams@...el.com>, <bhelgaas@...gle.com>, <mahesh@...ux.ibm.com>,
	<ira.weiny@...el.com>, <oohall@...il.com>, <Benjamin.Cheatham@....com>,
	<rrichter@....com>, <nathan.fontenot@....com>, <terry.bowman@....com>,
	<Smita.KoralahalliChannabasappa@....com>, <lukas@...ner.de>,
	<PradeepVineshReddy.Kodamati@....com>
Subject: [PATCH v4 06/15] PCI/AER: Change AER driver to read UCE fatal status for all CXL PCIe Port devices

The AER service driver's aer_get_device_error_info() function doesn't read
uncorrectable (UCE) fatal error status from PCIe Upstream Port devices,
including CXL Upstream Switch Ports. As a result, fatal errors are not
logged or handled as needed for CXL PCIe Upstream Switch Port devices.

Update the aer_get_device_error_info() function to read the UCE fatal
status for all CXL PCIe devices. Make the change such that non-CXL devices
are not affected.

The fatal error status will be used in future patches implementing
CXL PCIe Port uncorrectable error handling and logging.

Signed-off-by: Terry Bowman <terry.bowman@....com>
---
 drivers/pci/pcie/aer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index d75886174969..c1eb939c1cca 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -1250,7 +1250,8 @@ int aer_get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
 	} else if (type == PCI_EXP_TYPE_ROOT_PORT ||
 		   type == PCI_EXP_TYPE_RC_EC ||
 		   type == PCI_EXP_TYPE_DOWNSTREAM ||
-		   info->severity == AER_NONFATAL) {
+		   info->severity == AER_NONFATAL ||
+		   (pcie_is_cxl(dev) && type == PCI_EXP_TYPE_UPSTREAM)) {
 
 		/* Link is still healthy for IO reads */
 		pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS,
-- 
2.34.1