On 10/13/2015 02:36 PM, Dan Williams wrote:
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
After revert my commits on NVDIMM driver, yeah, it works.
Okay, i will drop the namespace part and make it as label-less
instead.
Thank you, Dan!
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