@@ -490,6 +490,103 @@ static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
#endif
}
+struct ghes_event_notify {
+ struct list_head list;
+ struct rcu_head rcu_head;
+ guid_t sec_type; /* guid of the error record */
+ ghes_event_handler_t event_handler; /* event handler function */
+ void *data; /* handler driver's private data if any */
+};
+
+/* List to store the registered event handling functions */
+static DEFINE_MUTEX(ghes_event_notify_mutex);
+static LIST_HEAD(ghes_event_handler_list);
+
+/**
+ * ghes_register_event_handler - register an event handling
+ * function for the non-fatal HW errors.
+ * @sec_type: sec_type of the corresponding CPER to be notified.
+ * @event_handler: pointer to the error handling function.
+ * @data: handler driver's private data.
+ *
+ * return 0 : SUCCESS, non-zero : FAIL
+ */
+int ghes_register_event_handler(guid_t sec_type,
+ ghes_event_handler_t event_handler,
+ void *data)
+{
+ struct ghes_event_notify *event_notify;
+
+ event_notify = kzalloc(sizeof(*event_notify), GFP_KERNEL);
+ if (!event_notify)
+ return -ENOMEM;
+
+ event_notify->event_handler = event_handler;
+ guid_copy(&event_notify->sec_type, &sec_type);
+ event_notify->data = data;
+
+ mutex_lock(&ghes_event_notify_mutex);
+ list_add_rcu(&event_notify->list, &ghes_event_handler_list);
+ mutex_unlock(&ghes_event_notify_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ghes_register_event_handler);
+
+/**
+ * ghes_unregister_event_handler - unregister the previously
+ * registered event handling function.
+ * @sec_type: sec_type of the corresponding CPER.
+ */
+void ghes_unregister_event_handler(guid_t sec_type)
+{
+ struct ghes_event_notify *event_notify;
+ bool found = false;
+
+ mutex_lock(&ghes_event_notify_mutex);
+ rcu_read_lock();
+ list_for_each_entry_rcu(event_notify,
+ &ghes_event_handler_list, list) {
+ if (guid_equal(&event_notify->sec_type, &sec_type)) {
+ list_del_rcu(&event_notify->list);
+ found = true;
+ break;
+ }
+ }
+ rcu_read_unlock();
+ mutex_unlock(&ghes_event_notify_mutex);
+
+ if (!found) {
+ pr_err("Tried to unregister a GHES event handler that has not been registered\n");
+ return;
+ }
+
+ synchronize_rcu();
+ kfree(event_notify);
+}
+EXPORT_SYMBOL_GPL(ghes_unregister_event_handler);
+
+static int ghes_handle_non_standard_event(guid_t *sec_type,
+ struct acpi_hest_generic_data *gdata, int sev)
+{
+ struct ghes_event_notify *event_notify;
+ bool found = false;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(event_notify,
+ &ghes_event_handler_list, list) {
+ if (guid_equal(&event_notify->sec_type, sec_type)) {
+ event_notify->event_handler(gdata, sev,
+ event_notify->data);
+ found = true;
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ return found;
+}
+
static void ghes_do_proc(struct ghes *ghes,
const struct acpi_hest_generic_status *estatus)
{
@@ -525,11 +622,14 @@ static void ghes_do_proc(struct ghes *ghes,
log_arm_hw_error(err);
} else {
- void *err = acpi_hest_get_payload(gdata);
-
- log_non_standard_event(sec_type, fru_id, fru_text,
- sec_sev, err,
- gdata->error_data_length);
+ if (!ghes_handle_non_standard_event(sec_type, gdata,
+ sev)) {
+ void *err = acpi_hest_get_payload(gdata);
+
+ log_non_standard_event(sec_type, fru_id,
+ fru_text, sec_sev, err,
+ gdata->error_data_length);
+ }
}
}
}
@@ -50,6 +50,55 @@ enum {
GHES_SEV_PANIC = 0x3,
};
+/**
+ * typedef ghes_event_handler_t - event handling function
+ * for the non-fatal HW errors.
+ *
+ * @gdata: acpi_hest_generic_data.
+ * @sev: error severity of the entire error event defined in the
+ * ACPI spec table generic error status block.
+ * @data: handler driver's private data.
+ *
+ * The error handling function is responsible for logging error and
+ * this function would be called in the interrupt context.
+ */
+typedef void (*ghes_event_handler_t)(struct acpi_hest_generic_data *gdata,
+ int sev, void *data);
+
+#ifdef CONFIG_ACPI_APEI_GHES
+/**
+ * ghes_register_event_handler - register an event handling
+ * function for the non-fatal HW errors.
+ * @sec_type: sec_type of the corresponding CPER to be notified.
+ * @event_handler: pointer to the event handling function.
+ * @data: handler driver's private data.
+ *
+ * Return : 0 - SUCCESS, non-zero - FAIL.
+ */
+int ghes_register_event_handler(guid_t sec_type,
+ ghes_event_handler_t event_handler,
+ void *data);
+
+/**
+ * ghes_unregister_event_handler - unregister the previously
+ * registered event handling function.
+ * @sec_type: sec_type of the corresponding CPER.
+ */
+void ghes_unregister_event_handler(guid_t sec_type);
+
+#else
+int ghes_register_event_handler(guid_t sec_type,
+ ghes_event_handler_t event_handler,
+ void *data)
+{
+ return -ENODEV;
+}
+
+void ghes_unregister_event_handler(guid_t sec_type)
+{
+}
+#endif
+
int ghes_estatus_pool_init(int num_ghes);
/* From drivers/edac/ghes_edac.c */
Presently APEI does not support reporting the vendor specific HW errors, received in the vendor defined table entries, to the vendor drivers for any recovery. This patch adds the support to register and unregister the error handling function for the vendor specific HW errors and notify the registered kernel driver. Signed-off-by: Shiju Jose <shiju.jose@huawei.com> --- drivers/acpi/apei/ghes.c | 110 ++++++++++++++++++++++++++++++++++++++++++++--- include/acpi/ghes.h | 49 +++++++++++++++++++++ 2 files changed, 154 insertions(+), 5 deletions(-)