[RFC PATCH 8/9] PCI/AER: Export pci_aer_unmask_internal_errors()

[Terry Bowman]

AER correctable internal errors (CIE) and AER uncorrectable internal
errors (UIE) are disabled through the AER mask register by default.[1]

CXL PCIe ports use the CIE/UIE to report RAS errors and as a result
need CIE/UIE enabled.[2]

Change pci_aer_unmask_internal_errors() function to be exported for
the CXL driver and other drivers to use.

[1] PCI6.0 - 7.8.4.3 Uncorrectable
[2] CXL3.1 - 12.2.2 CXL Root Ports, Downstream Switch Ports, and Upstream
             Switch Ports

Signed-off-by: Terry Bowman <terry.bowman@xxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: linux-pci@xxxxxxxxxxxxxxx
---
 drivers/pci/pcie/aer.c | 3 ++-
 include/linux/aer.h    | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 4dc03cb9aff0..d7a1982f0c50 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -951,7 +951,7 @@ static bool find_source_device(struct pci_dev *parent,
  * 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;
@@ -964,6 +964,7 @@ 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_GPL(pci_aer_unmask_internal_errors);
 
 static bool is_cxl_mem_dev(struct pci_dev *dev)
 {
diff --git a/include/linux/aer.h b/include/linux/aer.h
index 4b97f38f3fcf..a4fd25ea0280 100644
--- a/include/linux/aer.h
+++ b/include/linux/aer.h
@@ -50,6 +50,12 @@ static inline int pci_aer_clear_nonfatal_status(struct pci_dev *dev)
 static inline int pcie_aer_is_native(struct pci_dev *dev) { return 0; }
 #endif
 
+#ifdef CONFIG_PCIEAER_CXL
+void pci_aer_unmask_internal_errors(struct pci_dev *dev);
+#else
+static inline void pci_aer_unmask_internal_errors(struct pci_dev *dev) { }
+#endif
+
 void pci_print_aer(struct pci_dev *dev, int aer_severity,
 		    struct aer_capability_regs *aer);
 int cper_severity_to_aer(int cper_severity);
-- 
2.34.1