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>

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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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drivers/acpi/nfit/core.c

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