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libnvdimm, nfit: export an 'ecc_unit_size' sysfs attribute

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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>
This commit is contained in:
Dan Williams 2017-08-31 12:53:36 -07:00
parent ed36b4dba5
commit a15797f4be
1 changed files with 11 additions and 0 deletions
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11
drivers/acpi/nfit/core.c
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@ -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,
};