[PATCH 2/2] ACPI: extlog: Trace CPER PCI Express Error Section

[Fabio M. De Francesco]

Currently, extlog_print() (ELOG) only reports CPER PCIe section (UEFI
v2.10, Appendix N.2.7) to the kernel log via print_extlog_rcd(). Instead,
the similar ghes_do_proc() (GHES) prints to kernel log and calls
pci_print_aer() to report via the ftrace infrastructure.

Add support to report the CPER PCIe Error section also via the ftrace
infrastructure by calling pci_print_aer() to make ELOG act consistently
with GHES.

Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Fabio M. De Francesco <fabio.m.de.francesco@xxxxxxxxxxxxxxx>
---
 drivers/acpi/acpi_extlog.c | 30 ++++++++++++++++++++++++++++++
 drivers/pci/pcie/aer.c     |  2 +-
 include/linux/aer.h        | 13 +++++++++++--
 3 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
index e025ae390737..007ce96f8672 100644
--- a/drivers/acpi/acpi_extlog.c
+++ b/drivers/acpi/acpi_extlog.c
@@ -131,6 +131,32 @@ static int print_extlog_rcd(const char *pfx,
 	return 1;
 }
 
+static void extlog_print_pcie(struct cper_sec_pcie *pcie_err,
+			      int severity)
+{
+	struct aer_capability_regs *aer;
+	struct pci_dev *pdev;
+	unsigned int devfn;
+	unsigned int bus;
+	int aer_severity;
+	int domain;
+
+	if (pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
+	    pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
+		aer_severity = cper_severity_to_aer(severity);
+		aer = (struct aer_capability_regs *)pcie_err->aer_info;
+		domain = pcie_err->device_id.segment;
+		bus = pcie_err->device_id.bus;
+		devfn = PCI_DEVFN(pcie_err->device_id.device,
+				  pcie_err->device_id.function);
+		pdev = pci_get_domain_bus_and_slot(domain, bus, devfn);
+		if (!pdev)
+			return;
+		pci_print_aer(pdev, aer_severity, aer);
+		pci_dev_put(pdev);
+	}
+}
+
 static int extlog_print(struct notifier_block *nb, unsigned long val,
 			void *data)
 {
@@ -179,6 +205,10 @@ static int extlog_print(struct notifier_block *nb, unsigned long val,
 			if (gdata->error_data_length >= sizeof(*mem))
 				trace_extlog_mem_event(mem, err_seq, fru_id, fru_text,
 						       (u8)gdata->error_severity);
+		} else if (guid_equal(sec_type, &CPER_SEC_PCIE)) {
+			struct cper_sec_pcie *pcie_err = acpi_hest_get_payload(gdata);
+
+			extlog_print_pcie(pcie_err, gdata->error_severity);
 		} else {
 			void *err = acpi_hest_get_payload(gdata);
 
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index ac6293c24976..794aa15527ba 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -801,7 +801,7 @@ void pci_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);
 }
-EXPORT_SYMBOL_NS_GPL(pci_print_aer, CXL);
+EXPORT_SYMBOL_GPL(pci_print_aer);
 
 /**
  * add_error_device - list device to be handled
diff --git a/include/linux/aer.h b/include/linux/aer.h
index 4b97f38f3fcf..fbc82206045c 100644
--- a/include/linux/aer.h
+++ b/include/linux/aer.h
@@ -42,17 +42,26 @@ int pcie_read_tlp_log(struct pci_dev *dev, int where, struct pcie_tlp_log *log);
 #if defined(CONFIG_PCIEAER)
 int pci_aer_clear_nonfatal_status(struct pci_dev *dev);
 int pcie_aer_is_native(struct pci_dev *dev);
+void pci_print_aer(struct pci_dev *dev, int aer_severity,
+		   struct aer_capability_regs *aer);
 #else
 static inline int pci_aer_clear_nonfatal_status(struct pci_dev *dev)
 {
 	return -EINVAL;
 }
+
 static inline int pcie_aer_is_native(struct pci_dev *dev) { return 0; }
+static inline void pci_print_aer(struct pci_dev *dev, int aer_severity,
+				 struct aer_capability_regs *aer)
+{ }
 #endif
 
-void pci_print_aer(struct pci_dev *dev, int aer_severity,
-		    struct aer_capability_regs *aer);
+#if defined(CONFIG_ACPI_APEI_PCIEAER)
 int cper_severity_to_aer(int cper_severity);
+#else
+static inline int cper_severity_to_aer(int cper_severity) { return 0; }
+#endif
+
 void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
 		       int severity, struct aer_capability_regs *aer_regs);
 #endif //_AER_H_
-- 
2.45.1