ACPI: extlog: Trace CPER PCI Express Error Section

I/O Machine Check Architecture events may signal failing PCIe components
or links. The AER event contains details on what was happening on the wire
when the error was signaled.

Trace the CPER PCIe Error section (UEFI v2.11, Appendix N.2.7) reported
by the I/O MCA.

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Fabio M. De Francesco <fabio.m.de.francesco@linux.intel.com>
Link: https://patch.msgid.link/20260114101543.85926-3-fabio.m.de.francesco@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
index 47d11cb5c912039dbc764d66a2c534897ded6ca0..88a2237772c26151a2a116242c36f0eb8e374fb2 100644 (file)
--- a/drivers/acpi/acpi_extlog.c
+++ b/drivers/acpi/acpi_extlog.c
@@ -132,6 +132,36 @@ static int print_extlog_rcd(const char *pfx,
        return 1;
 }
 
+static void extlog_print_pcie(struct cper_sec_pcie *pcie_err,
+                             int severity)
+{
+#ifdef ACPI_APEI_PCIEAER
+       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))
+               return;
+
+       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);
+#endif
+}
+
 static int extlog_print(struct notifier_block *nb, unsigned long val,
                        void *data)
 {
@@ -183,6 +213,10 @@ 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 e0bcaa896803c91e7451e57fed06a725c90c6114..71ee4f5064ded47a365f9fde7d334adab718931e 100644 (file)
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -973,7 +973,7 @@ void pci_print_aer(struct pci_dev *dev, int aer_severity,
                pcie_print_tlp_log(dev, &aer->header_log, info.level,
                                   dev_fmt("  "));
 }
-EXPORT_SYMBOL_NS_GPL(pci_print_aer, "CXL");
+EXPORT_SYMBOL_GPL(pci_print_aer);
 
 /**
  * add_error_device - list device to be handled