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The "Clear Error Unit" may be smaller than the ECC unit size on some devices. For example, poison may be tracked at 64-byte alignment even though the ECC unit is larger. Unless / until the ACPI specification provides a non-ambiguous way to communicate this property do not expose this to userspace. Software that had been using this property must already be prepared for the case where the property is not provided on older kernels, so it is safe to remove this attribute. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
18 lines
809 B
Plaintext
18 lines
809 B
Plaintext
What: /sys/bus/nd/devices/regionX/nfit/ecc_unit_size
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Date: Aug, 2017
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KernelVersion: v4.14 (Removed v4.18)
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Contact: linux-nvdimm@lists.01.org
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Description:
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(RO) Size of a write request to a DIMM that will not incur a
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read-modify-write cycle at the memory controller.
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When the nfit driver initializes it runs an ARS (Address Range
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Scrub) operation across every pmem range. Part of that process
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involves determining the ARS capabilities of a given address
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range. One of the capabilities that is reported is the 'Clear
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Uncorrectable Error Range Length Unit Size' (see: ACPI 6.2
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section 9.20.7.4 Function Index 1 - Query ARS Capabilities).
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This property indicates the boundary at which the NVDIMM may
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need to perform read-modify-write cycles to maintain ECC (Error
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Correcting Code) blocks.
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