a15797f4bef201544263ef5c264c3f48d78cc5d4 libnvdimm, nfit: export an 
'ecc_unit_size' sysfs attribute

** Tags added: kernel

** Information type changed from Proprietary to Public

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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  [Feature][Crystal Ridge] Export the read-modify-write boundary in

Status in intel:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  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 Function Index 1 -
  Query ARS Capabilities). This property is of interest to userspace
  software as it indicates the boundary at which the NVDIMM may ned to
  perform read-modify-write cycles to maintain ECC blocks.

  Commit Ids:

  Target Kernel: 4.14
  Target Release: 18.04

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