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Diffstat (limited to 'Documentation/ABI/removed/sysfs-bus-nfit')
| -rw-r--r-- | Documentation/ABI/removed/sysfs-bus-nfit | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/ABI/removed/sysfs-bus-nfit b/Documentation/ABI/removed/sysfs-bus-nfit new file mode 100644 index 000000000000..ae8c1ca53828 --- /dev/null +++ b/Documentation/ABI/removed/sysfs-bus-nfit @@ -0,0 +1,17 @@ +What: /sys/bus/nd/devices/regionX/nfit/ecc_unit_size +Date: Aug, 2017 +KernelVersion: v4.14 (Removed v4.18) +Contact: linux-nvdimm@lists.01.org +Description: + (RO) Size of a write request to a DIMM that will not incur a + read-modify-write cycle at the memory controller. + + 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 indicates the boundary at which the NVDIMM may + need to perform read-modify-write cycles to maintain ECC (Error + Correcting Code) blocks. |