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| author | Dan Williams <dan.j.williams@intel.com> | 2017-08-31 12:53:36 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-08-31 12:53:36 -0700 |
| commit | a15797f4bef201544263ef5c264c3f48d78cc5d4 (patch) | |
| tree | 6f879ef7a0f288e11615065f445cab90ee2a7ca6 /drivers/acpi/nfit/core.c | |
| parent | ed36b4dba54a421ce5551638f6a9790b2c2116b1 (diff) | |
| download | lwn-a15797f4bef201544263ef5c264c3f48d78cc5d4.tar.gz lwn-a15797f4bef201544263ef5c264c3f48d78cc5d4.zip | |
libnvdimm, nfit: export an 'ecc_unit_size' sysfs attribute
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>
Diffstat (limited to 'drivers/acpi/nfit/core.c')
| -rw-r--r-- | drivers/acpi/nfit/core.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 2c5608b92578..03105648f9b1 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -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, }; |