[RFC PATCH v2 2/3] ACPI: extlog: Trace CPER PCI Express Error Section

["Fabio M. De Francesco" <fabio.m.de.francesco@xxxxxxxxxxxxxxx>]

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 | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
index 4e62d7235d33..fb7b0c73f86a 100644
--- a/drivers/acpi/acpi_extlog.c
+++ b/drivers/acpi/acpi_extlog.c
@@ -131,6 +131,36 @@ static int print_extlog_rcd(const char *pfx,
 	return 1;
 }
 
+static void extlog_print_pcie(struct cper_sec_pcie *pcie_err,
+			      int severity)
+{
+#ifdef CONFIG_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) {
+		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) {
+			pr_err("no pci_dev for %04x:%02x:%02x.%x\n",
+			       domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
+			return;
+		}
+		pci_print_aer(pdev, aer_severity, aer);
+	}
+#endif
+}
+
 static int extlog_print(struct notifier_block *nb, unsigned long val,
 			void *data)
 {
@@ -182,6 +212,10 @@ 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);
 
@@ -331,3 +365,4 @@ module_exit(extlog_exit);
 MODULE_AUTHOR("Chen, Gong <gong.chen@xxxxxxxxx>");
 MODULE_DESCRIPTION("Extended MCA Error Log Driver");
 MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(CXL);
-- 
2.45.0