[PATCH v7 20/27] PCI/AER: Refactor cper_print_aer() for use by CXL driver module

[Terry Bowman <terry.bowman@amd.com>]

The CXL driver plans to use cper_print_aer() for logging restricted CXL
host (RCH) AER errors. cper_print_aer() is not currently exported and
therefore not usable by the CXL drivers built as loadable modules. Export
the cper_print_aer() function. Use the EXPORT_SYMBOL_NS_GPL() variant
to restrict the export to CXL drivers.

The CONFIG_ACPI_APEI_PCIEAER kernel config is currently used to enable
cper_print_aer(). cper_print_aer() logs the AER registers and is
useful in PCIE AER logging outside of APEI. Remove the
CONFIG_ACPI_APEI_PCIEAER dependency to enable cper_print_aer().

The cper_print_aer() function name implies CPER specific use but is useful
in non-CPER cases as well. Rename cper_print_aer() to pci_print_aer().

Also, update cxl_core to import CXL namespace imports.

Co-developed-by: Robert Richter <rrichter@amd.com>
Signed-off-by: Robert Richter <rrichter@amd.com>
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Cc: Mahesh J Salgaonkar <mahesh@linux.ibm.com>
Cc: "Oliver O'Halloran" <oohall@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/cxl/core/port.c | 1 +
 drivers/pci/pcie/aer.c  | 9 +++++----
 include/linux/aer.h     | 2 +-
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index 449472fb26a8..683f40e98119 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -2058,3 +2058,4 @@ static void cxl_core_exit(void)
 subsys_initcall(cxl_core_init);
 module_exit(cxl_core_exit);
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(CXL);
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index f6c24ded134c..d3344fcf1f79 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -771,9 +771,10 @@ int cper_severity_to_aer(int cper_severity)
 	}
 }
 EXPORT_SYMBOL_GPL(cper_severity_to_aer);
+#endif
 
-void cper_print_aer(struct pci_dev *dev, int aer_severity,
-		    struct aer_capability_regs *aer)
+void pci_print_aer(struct pci_dev *dev, int aer_severity,
+		   struct aer_capability_regs *aer)
 {
 	int layer, agent, tlp_header_valid = 0;
 	u32 status, mask;
@@ -812,7 +813,7 @@ void cper_print_aer(struct pci_dev *dev, int aer_severity,
 	trace_aer_event(dev_name(&dev->dev), (status & ~mask),
 			aer_severity, tlp_header_valid, &aer->header_log);
 }
-#endif
+EXPORT_SYMBOL_NS_GPL(pci_print_aer, CXL);
 
 /**
  * add_error_device - list device to be handled
@@ -1009,7 +1010,7 @@ static void aer_recover_work_func(struct work_struct *work)
 			       PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn));
 			continue;
 		}
-		cper_print_aer(pdev, entry.severity, entry.regs);
+		pci_print_aer(pdev, entry.severity, entry.regs);
 		if (entry.severity == AER_NONFATAL)
 			pcie_do_recovery(pdev, pci_channel_io_normal,
 					 aer_root_reset);
diff --git a/include/linux/aer.h b/include/linux/aer.h
index 97f64ba1b34a..8f124b904314 100644
--- a/include/linux/aer.h
+++ b/include/linux/aer.h
@@ -64,7 +64,7 @@ static inline void pci_save_aer_state(struct pci_dev *dev) {}
 static inline void pci_restore_aer_state(struct pci_dev *dev) {}
 #endif
 
-void cper_print_aer(struct pci_dev *dev, int aer_severity,
+void pci_print_aer(struct pci_dev *dev, int aer_severity,
 		    struct aer_capability_regs *aer);
 int cper_severity_to_aer(int cper_severity);
 void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
-- 
2.34.1