[v11,12/20] PCI/AER: Refactor cper_print_aer() for use by CXL driver module

Commit Message

Robert Richter Sept. 27, 2023, 3:43 p.m. UTC

From: Terry Bowman <[e-mail]>

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 <[e-mail]>
Signed-off-by: Terry Bowman <[e-mail]>
Signed-off-by: Robert Richter <[e-mail]>
Cc: Mahesh J Salgaonkar <[e-mail]>
Cc: "Oliver O'Halloran" <[e-mail]>
Cc: Bjorn Helgaas <[e-mail]>
Cc: [e-mail]
Reviewed-by: Jonathan Cameron <[e-mail]>
Acked-by: Bjorn Helgaas <[e-mail]>
Reviewed-by: Dave Jiang <[e-mail]>
---
 drivers/cxl/core/port.c | 1 +
 drivers/pci/pcie/aer.c  | 9 +++++----
 include/linux/aer.h     | 2 +-
 3 files changed, 7 insertions(+), 5 deletions(-)

Patch

diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index 41a8aa56cffd..802e85321a63 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -2101,3 +2101,4 @@  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 9c8fd69ae5ad..6593fe3fc555 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -759,9 +759,10 @@  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;
@@ -800,7 +801,7 @@  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
@@ -996,7 +997,7 @@  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 29cc10220952..f6ea2f57d808 100644
--- a/include/linux/aer.h
+++ b/include/linux/aer.h
@@ -51,7 +51,7 @@  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
 
-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,