ghes: add the needed hooks for EDAC error report

In order to allow reporting errors via EDAC, add hooks for:

1) register an EDAC driver;
2) unregister an EDAC driver;
3) report errors via EDAC.

As the EDAC driver will need to access the ghes structure, adds it
as one of the parameters for ghes_do_proc.

Acked-by: Huang Ying <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/acpi/apei/ghes.c

···
 	ghes->flags &= ~GHES_TO_CLEAR;
 }
 
-static void ghes_do_proc(const struct acpi_hest_generic_status *estatus)
+static void ghes_do_proc(struct ghes *ghes,
+			 const struct acpi_hest_generic_status *estatus)
 {
 	int sev, sec_sev;
 	struct acpi_hest_generic_data *gdata;
···
 				 CPER_SEC_PLATFORM_MEM)) {
 			struct cper_sec_mem_err *mem_err;
 			mem_err = (struct cper_sec_mem_err *)(gdata+1);
+			ghes_edac_report_mem_error(ghes, sev, mem_err);
+
 #ifdef CONFIG_X86_MCE
 			apei_mce_report_mem_error(sev == GHES_SEV_CORRECTED,
 						  mem_err);
···
 		if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
 			ghes_estatus_cache_add(ghes->generic, ghes->estatus);
 	}
-	ghes_do_proc(ghes->estatus);
+	ghes_do_proc(ghes, ghes->estatus);
 out:
 	ghes_clear_estatus(ghes);
 	return 0;
···
 		estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
 		len = apei_estatus_len(estatus);
 		node_len = GHES_ESTATUS_NODE_LEN(len);
-		ghes_do_proc(estatus);
+		ghes_do_proc(estatus_node->ghes, estatus);
 		if (!ghes_estatus_cached(estatus)) {
 			generic = estatus_node->generic;
 			if (ghes_print_estatus(NULL, generic, estatus))
···
 		estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool,
 						      node_len);
 		if (estatus_node) {
+			estatus_node->ghes = ghes;
 			estatus_node->generic = ghes->generic;
 			estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
 			memcpy(estatus, ghes->estatus, len);
···
 		ghes = NULL;
 		goto err;
 	}
+
+	rc = ghes_edac_register(ghes, &ghes_dev->dev);
+	if (rc < 0)
+		goto err;
+
 	switch (generic->notify.type) {
 	case ACPI_HEST_NOTIFY_POLLED:
 		ghes->timer.function = ghes_poll_func;
···
 		if (acpi_gsi_to_irq(generic->notify.vector, &ghes->irq)) {
 			pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
 			       generic->header.source_id);
-			goto err;
+			goto err_edac_unreg;
 		}
 		if (request_irq(ghes->irq, ghes_irq_func,
 				0, "GHES IRQ", ghes)) {
 			pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
 			       generic->header.source_id);
-			goto err;
+			goto err_edac_unreg;
 		}
 		break;
 	case ACPI_HEST_NOTIFY_SCI:
···
 	platform_set_drvdata(ghes_dev, ghes);
 
 	return 0;
+err_edac_unreg:
+	ghes_edac_unregister(ghes);
 err:
 	if (ghes) {
 		ghes_fini(ghes);
···
 	}
 
 	ghes_fini(ghes);
+
+	ghes_edac_unregister(ghes);
+
 	kfree(ghes);
 
 	platform_set_drvdata(ghes_dev, NULL);

include/acpi/ghes.h

···
 struct ghes_estatus_node {
 	struct llist_node llnode;
 	struct acpi_hest_generic *generic;
+	struct ghes *ghes;
 };
 
 struct ghes_estatus_cache {
···
 	GHES_SEV_RECOVERABLE = 0x2,
 	GHES_SEV_PANIC = 0x3,
 };
+
+/* From drivers/edac/ghes_edac.c */
+
+#ifdef CONFIG_EDAC_GHES
+void ghes_edac_report_mem_error(struct ghes *ghes, int sev,
+				struct cper_sec_mem_err *mem_err);
+
+int ghes_edac_register(struct ghes *ghes, struct device *dev);
+
+void ghes_edac_unregister(struct ghes *ghes);
+
+#else
+static inline void ghes_edac_report_mem_error(struct ghes *ghes, int sev,
+				       struct cper_sec_mem_err *mem_err)
+{
+}
+
+static inline int ghes_edac_register(struct ghes *ghes, struct device *dev)
+{
+	return 0;
+}
+
+static inline void ghes_edac_unregister(struct ghes *ghes)
+{
+}
+#endif