@@ -1674,8 +1674,19 @@ static ssize_t range_index_show(struct device *dev,
}
static DEVICE_ATTR_RO(range_index);
+static ssize_t ecc_unit_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+ struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
+
+ return sprintf(buf, "%d\n", nfit_spa->clear_err_unit);
+}
+static DEVICE_ATTR_RO(ecc_unit_size);
+
static struct attribute *acpi_nfit_region_attributes[] = {
&dev_attr_range_index.attr,
+ &dev_attr_ecc_unit_size.attr,
NULL,
};
When the nfit driver initializes it runs an ARS (Address Range Scrub) operation across every pmem range. Part of that process involves determining the ARS capabilities of a given address range. One of the capabilities that is reported is the 'Clear Uncorrectable Error Range Length Unit Size' (see: ACPI 6.2 section 9.20.7.4 Function Index 1 - Query ARS Capabilities). This property is of interest to userspace software as it indicates the boundary at which the NVDIMM may need to perform read-modify-write cycles to maintain ECC blocks. Cc: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- drivers/acpi/nfit/core.c | 11 +++++++++++ 1 file changed, 11 insertions(+)