linux-kernel - [PATCH v3 15/15] PCI/AER: Enable internal errors for CXL upstream and downstream switch ports

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Message-ID: <20241113215429.3177981-16-terry.bowman@amd.com>
Date: Wed, 13 Nov 2024 15:54:29 -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>
Subject: [PATCH v3 15/15] PCI/AER: Enable internal errors for CXL upstream and downstream switch ports

The AER service driver enables uncorrectable internal errors (UIE) and
correctable internal errors (CIE) for CXL root ports and CXL RCEC's. The
UIE and CIE are used in reporting CXL protocol errors. The same UIE/CIE
enablement is needed for CXL PCIe upstream and downstream ports inorder to
notify the associated root port and OS.[1]

Export the AER service driver's pci_aer_unmask_internal_errors() function
to CXL namsespace.

Remove the function's dependency on the CONFIG_PCIEAER_CXL kernel config
because it is now an exported function.

Call pci_aer_unmask_internal_errors() during RAS initialization in:
cxl_uport_init_ras_reporting() and cxl_dport_init_ras_reporting().

[1] PCIe Base Spec r6.2-1.0, 6.2.3.2.2 Masking Individual Errors

Signed-off-by: Terry Bowman <terry.bowman@....com>
---
 drivers/cxl/core/pci.c | 2 ++
 drivers/pci/pcie/aer.c | 5 +++--
 include/linux/aer.h    | 1 +
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index af2ff6936a09..4ede038a7148 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -887,6 +887,7 @@ void cxl_uport_init_ras_reporting(struct cxl_port *port)
 
 	cxl_assign_port_error_handlers(pdev);
 	devm_add_action_or_reset(port->uport_dev, cxl_clear_port_error_handlers, pdev);
+	pci_aer_unmask_internal_errors(pdev);
 }
 EXPORT_SYMBOL_NS_GPL(cxl_uport_init_ras_reporting, CXL);
 
@@ -919,6 +920,7 @@ void cxl_dport_init_ras_reporting(struct cxl_dport *dport)
 
 	cxl_assign_port_error_handlers(pdev);
 	devm_add_action_or_reset(dport_dev, cxl_clear_port_error_handlers, pdev);
+	pci_aer_unmask_internal_errors(pdev);
 }
 EXPORT_SYMBOL_NS_GPL(cxl_dport_init_ras_reporting, CXL);
 
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 87fddd514030..1028814379e4 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -949,7 +949,6 @@ static bool is_internal_error(struct aer_err_info *info)
 	return info->status & PCI_ERR_UNC_INTN;
 }
 
-#ifdef CONFIG_PCIEAER_CXL
 /**
  * pci_aer_unmask_internal_errors - unmask internal errors
  * @dev: pointer to the pcie_dev data structure
@@ -960,7 +959,7 @@ static bool is_internal_error(struct aer_err_info *info)
  * Note: AER must be enabled and supported by the device which must be
  * checked in advance, e.g. with pcie_aer_is_native().
  */
-static void pci_aer_unmask_internal_errors(struct pci_dev *dev)
+void pci_aer_unmask_internal_errors(struct pci_dev *dev)
 {
 	int aer = dev->aer_cap;
 	u32 mask;
@@ -973,7 +972,9 @@ static void pci_aer_unmask_internal_errors(struct pci_dev *dev)
 	mask &= ~PCI_ERR_COR_INTERNAL;
 	pci_write_config_dword(dev, aer + PCI_ERR_COR_MASK, mask);
 }
+EXPORT_SYMBOL_NS_GPL(pci_aer_unmask_internal_errors, CXL);
 
+#ifdef CONFIG_PCIEAER_CXL
 static bool is_cxl_mem_dev(struct pci_dev *dev)
 {
 	/*
diff --git a/include/linux/aer.h b/include/linux/aer.h
index 4b97f38f3fcf..093293f9f12b 100644
--- a/include/linux/aer.h
+++ b/include/linux/aer.h
@@ -55,5 +55,6 @@ void pci_print_aer(struct pci_dev *dev, int aer_severity,
 int cper_severity_to_aer(int cper_severity);
 void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
 		       int severity, struct aer_capability_regs *aer_regs);
+void pci_aer_unmask_internal_errors(struct pci_dev *dev);
 #endif //_AER_H_
 
-- 
2.34.1