linux-kernel - [RFC PATCH 9/9] cxl/pci: Enable interrupts for CXL PCIe ports' AER internal errors

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Date: Mon, 17 Jun 2024 15:04:11 -0500
From: Terry Bowman <terry.bowman@....com>
To: <dan.j.williams@...el.com>, <ira.weiny@...el.com>, <dave@...olabs.net>,
	<dave.jiang@...el.com>, <alison.schofield@...el.com>, <ming4.li@...el.com>,
	<vishal.l.verma@...el.com>, <jim.harris@...sung.com>,
	<ilpo.jarvinen@...ux.intel.com>, <ardb@...nel.org>,
	<sathyanarayanan.kuppuswamy@...ux.intel.com>, <linux-cxl@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <terry.bowman@....com>,
	<Yazen.Ghannam@....com>, <Robert.Richter@....com>
Subject: [RFC PATCH 9/9] cxl/pci: Enable interrupts for CXL PCIe ports' AER internal errors

CXL RAS errors are reported through AER interrupts using the AER status:
correctbale internal errors (CIE) and AER uncorrectable internal errors
(UIE).[1] But, the AER CIE/UIE are disabled by default preventing
notification of CXL RAS errors.[2]

Enable CXL PCIe port RAS notification by unmasking the ports' AER CIE
and UIE errors.

[1] CXL3.1 - 12.2.2 CXL Root Ports, Downstream Switch Ports, and Upstream
             Switch Ports
[2] PCI6.0 - 7.8.4.3 Uncorrectable Error Mask Register (Offset 08h),
             7.8.4.6 Correctable Error Mask Register (Offset 14h)

Signed-off-by: Terry Bowman <terry.bowman@....com>
---
 drivers/cxl/core/pci.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index e630eccb733d..73637d39df0a 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -861,6 +861,12 @@ void cxl_setup_parent_uport(struct device *host, struct cxl_port *port)
 	struct device *uport_dev = port->uport_dev;
 
 	cxl_port_map_regs(uport_dev, map, regs);
+
+	if (dev_is_pci(uport_dev)) {
+		struct pci_dev *pdev = to_pci_dev(uport_dev);
+
+		pci_aer_unmask_internal_errors(pdev);
+	}
 }
 EXPORT_SYMBOL_NS_GPL(cxl_setup_parent_uport, CXL);
 
@@ -878,6 +884,12 @@ void cxl_setup_parent_dport(struct device *host, struct cxl_dport *dport)
 
 	if (dport->rch)
 		cxl_disable_rch_root_ints(dport);
+
+	if (dev_is_pci(dport_dev)) {
+		struct pci_dev *pdev = to_pci_dev(dport_dev);
+
+		pci_aer_unmask_internal_errors(pdev);
+	}
 }
 EXPORT_SYMBOL_NS_GPL(cxl_setup_parent_dport, CXL);
 
-- 
2.34.1