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

Commit Message

Shiju Jose April 7, 2020, noon UTC

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

Signed-off-by: Shiju Jose <[e-mail]>
---
 drivers/acpi/apei/ghes.c | 55 ++++++++++++++++++++++++++++++----------
 1 file changed, 42 insertions(+), 13 deletions(-)

Patch

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;