[v7 PATCH 2/6] ACPI / APEI: Add callback for memory errors to the GHES notifier

[Shiju Jose <shiju.jose@xxxxxxxxxx>]

Add callback function for handling the memory errors to the GHES notifier.

Signed-off-by: Shiju Jose <shiju.jose@xxxxxxxxxx>
---
 drivers/acpi/apei/ghes.c | 55 ++++++++++++++++++++++++++++++----------
 1 file changed, 42 insertions(+), 13 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 5c0ab5422311..053c4a2ed96c 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -471,23 +471,33 @@ static void ghes_clear_estatus(struct ghes *ghes,
 		ghes_ack_error(ghes->generic_v2);
 }
 
-static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int sev)
+static int ghes_handle_memory_failure(struct notifier_block *nb,
+				      unsigned long event, void *data)
 {
 #ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE
 	unsigned long pfn;
 	int flags = -1;
+	int sev = event;
+	struct acpi_hest_generic_data *gdata = data;
 	int sec_sev = ghes_severity(gdata->error_severity);
 	struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
 
+	if (!guid_equal((guid_t *)gdata->section_type, &CPER_SEC_PLATFORM_MEM))
+		return NOTIFY_DONE;
+
+	ghes_edac_report_mem_error(sev, mem_err);
+
+	arch_apei_report_mem_error(sev, mem_err);
+
 	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
-		return;
+		return NOTIFY_STOP;
 
 	pfn = mem_err->physical_addr >> PAGE_SHIFT;
 	if (!pfn_valid(pfn)) {
 		pr_warn_ratelimited(FW_WARN GHES_PFX
 		"Invalid address in generic error data: %#llx\n",
 		mem_err->physical_addr);
-		return;
+		return NOTIFY_STOP;
 	}
 
 	/* iff following two events can be handled properly by now */
@@ -500,6 +510,7 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
 	if (flags != -1)
 		memory_failure_queue(pfn, flags);
 #endif
+	return NOTIFY_STOP;
 }
 
 /*
@@ -547,6 +558,22 @@ static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
 #endif
 }
 
+static struct notifier_block ghes_notifier_mem_error = {
+	.notifier_call = ghes_handle_memory_failure,
+};
+
+struct ghes_error_handler_list {
+	const char *name;
+	struct notifier_block *nb;
+};
+
+static const struct ghes_error_handler_list ghes_error_handler_list[] = {
+	{
+		.name = "ghes_notifier_mem_error",
+		.nb = &ghes_notifier_mem_error,
+	},
+};
+
 static BLOCKING_NOTIFIER_HEAD(ghes_event_notify_list);
 
 /**
@@ -630,15 +657,7 @@ static void ghes_do_proc(struct ghes *ghes,
 			break;
 		}
 
-		if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
-			struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
-
-			ghes_edac_report_mem_error(sev, mem_err);
-
-			arch_apei_report_mem_error(sev, mem_err);
-			ghes_handle_memory_failure(gdata, sev);
-		}
-		else if (guid_equal(sec_type, &CPER_SEC_PCIE)) {
+		if (guid_equal(sec_type, &CPER_SEC_PCIE)) {
 			ghes_handle_aer(gdata);
 		}
 		else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) {
@@ -1431,7 +1450,7 @@ static struct platform_driver ghes_platform_driver = {
 
 static int __init ghes_init(void)
 {
-	int rc;
+	int rc, i;
 
 	if (acpi_disabled)
 		return -ENODEV;
@@ -1473,6 +1492,16 @@ static int __init ghes_init(void)
 		goto err;
 	}
 
+	for (i = 0; i < ARRAY_SIZE(ghes_error_handler_list); i++) {
+		const struct ghes_error_handler_list *list =
+						&ghes_error_handler_list[i];
+		rc = ghes_register_event_notifier(list->nb);
+		if (rc) {
+			pr_warn(GHES_PFX "fail to register %s\n", list->name);
+			goto err;
+		}
+	}
+
 	return 0;
 err:
 	return rc;
-- 
2.17.1