+static ssize_t hw_error_scrub_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
+ struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
+ struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+
+ return sprintf(buf, "%d\n", acpi_desc->scrub_mode);
+}
+
+/*
+ * The 'hw_error_scrub' attribute can have the following values written to it:
+ * '0': Switch to the default mode where an exception will only insert
+ * the address of the memory error into the poison and badblocks lists.
+ * '1': Enable a full scrub to happen if an exception for a memory error is
+ * received.
+ */
+static ssize_t hw_error_scrub_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t size)
+{
+ struct nvdimm_bus_descriptor *nd_desc;
+ ssize_t rc;
+ long val;
+
+ rc = kstrtol(buf, 0, &val);
+ if (rc)
+ return rc;
+
+ device_lock(dev);
+ nd_desc = dev_get_drvdata(dev);
+ if (nd_desc) {
+ struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+
+ switch (val) {
+ case HW_ERROR_SCRUB_ON:
+ acpi_desc->scrub_mode = HW_ERROR_SCRUB_ON;
+ break;
+ case HW_ERROR_SCRUB_OFF:
+ acpi_desc->scrub_mode = HW_ERROR_SCRUB_OFF;
+ break;
+ default:
+ rc = -EINVAL;
+ break;
+ }
+ }
+ device_unlock(dev);
+ if (rc)
+ return rc;
+ return size;
+}
+static DEVICE_ATTR_RW(hw_error_scrub);
+