On Mon, Oct 12, 2015 at 10:49 PM, Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx> wrote: > > > On 10/13/2015 11:38 AM, Dan Williams wrote: >> >> On Mon, Oct 12, 2015 at 8:14 PM, Xiao Guangrong >> <guangrong.xiao@xxxxxxxxxxxxxxx> wrote: >>> >>> On 10/13/2015 12:36 AM, Dan Williams wrote: >>>> >>>> Static namespaces can be emitted without a label. Linux needs this to >>>> support existing "label-less" bare metal NVDIMMs. >>> >>> >>> >>> This is Linux specific? As i did not see it has been documented in the >>> spec... >> >> >> I expect most NVDIMMs, especially existing ones available today, do >> not have a label area. This is not Linux specific and ACPI 6 does not >> specify a label area, only the Intel DSM Interface Example. >> > > Yup, label data is accessed via DSM interface, the spec I mentioned > is Intel DSM Interface Example. > > However, IIRC Linux NVDIMM driver refused to use the device if no > DSM GET_LABEL support, are you going to update it? Label-less DIMMs are tested as part of the unit test [1] and the "memmap=nn!ss" kernel parameter that registers a persistent-memory address range without a DIMM. What error do you see when label support is disabled? [1]: https://github.com/pmem/ndctl/blob/master/README.md -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
