1 files changed, 96 insertions, 0 deletions

diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index 3b4bb8d05035..3c85fd1ae5a9 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -777,12 +777,105 @@ void cxl_setup_parent_dport(struct device *host, struct cxl_dport *dport)
 }
 EXPORT_SYMBOL_NS_GPL(cxl_setup_parent_dport, CXL);
 
+static void cxl_handle_rdport_cor_ras(struct cxl_dev_state *cxlds,
+					  struct cxl_dport *dport)
+{
+	return __cxl_handle_cor_ras(cxlds, dport->regs.ras);
+}
+
+static bool cxl_handle_rdport_ras(struct cxl_dev_state *cxlds,
+				       struct cxl_dport *dport)
+{
+	return __cxl_handle_ras(cxlds, dport->regs.ras);
+}
+
+/*
+ * Copy the AER capability registers using 32 bit read accesses.
+ * This is necessary because RCRB AER capability is MMIO mapped. Clear the
+ * status after copying.
+ *
+ * @aer_base: base address of AER capability block in RCRB
+ * @aer_regs: destination for copying AER capability
+ */
+static bool cxl_rch_get_aer_info(void __iomem *aer_base,
+				 struct aer_capability_regs *aer_regs)
+{
+	int read_cnt = sizeof(struct aer_capability_regs) / sizeof(u32);
+	u32 *aer_regs_buf = (u32 *)aer_regs;
+	int n;
+
+	if (!aer_base)
+		return false;
+
+	/* Use readl() to guarantee 32-bit accesses */
+	for (n = 0; n < read_cnt; n++)
+		aer_regs_buf[n] = readl(aer_base + n * sizeof(u32));
+
+	writel(aer_regs->uncor_status, aer_base + PCI_ERR_UNCOR_STATUS);
+	writel(aer_regs->cor_status, aer_base + PCI_ERR_COR_STATUS);
+
+	return true;
+}
+
+/* Get AER severity. Return false if there is no error. */
+static bool cxl_rch_get_aer_severity(struct aer_capability_regs *aer_regs,
+				     int *severity)
+{
+	if (aer_regs->uncor_status & ~aer_regs->uncor_mask) {
+		if (aer_regs->uncor_status & PCI_ERR_ROOT_FATAL_RCV)
+			*severity = AER_FATAL;
+		else
+			*severity = AER_NONFATAL;
+		return true;
+	}
+
+	if (aer_regs->cor_status & ~aer_regs->cor_mask) {
+		*severity = AER_CORRECTABLE;
+		return true;
+	}
+
+	return false;
+}
+
+static void cxl_handle_rdport_errors(struct cxl_dev_state *cxlds)
+{
+	struct pci_dev *pdev = to_pci_dev(cxlds->dev);
+	struct aer_capability_regs aer_regs;
+	struct cxl_dport *dport;
+	struct cxl_port *port;
+	int severity;
+
+	port = cxl_pci_find_port(pdev, &dport);
+	if (!port)
+		return;
+
+	put_device(&port->dev);
+
+	if (!cxl_rch_get_aer_info(dport->regs.dport_aer, &aer_regs))
+		return;
+
+	if (!cxl_rch_get_aer_severity(&aer_regs, &severity))
+		return;
+
+	pci_print_aer(pdev, severity, &aer_regs);
+
+	if (severity == AER_CORRECTABLE)
+		cxl_handle_rdport_cor_ras(cxlds, dport);
+	else
+		cxl_handle_rdport_ras(cxlds, dport);
+}
+
+#else
+static void cxl_handle_rdport_errors(struct cxl_dev_state *cxlds) { }
 #endif
 
 void cxl_cor_error_detected(struct pci_dev *pdev)
 {
 	struct cxl_dev_state *cxlds = pci_get_drvdata(pdev);
 
+	if (cxlds->rcd)
+		cxl_handle_rdport_errors(cxlds);
+
 	cxl_handle_endpoint_cor_ras(cxlds);
 }
 EXPORT_SYMBOL_NS_GPL(cxl_cor_error_detected, CXL);
@@ -795,6 +888,9 @@ pci_ers_result_t cxl_error_detected(struct pci_dev *pdev,
 	struct device *dev = &cxlmd->dev;
 	bool ue;
 
+	if (cxlds->rcd)
+		cxl_handle_rdport_errors(cxlds);
+
 	/*
 	 * A frozen channel indicates an impending reset which is fatal to
 	 * CXL.mem operation, and will likely crash the system. On the off