On 2019/5/25 3:53, Ralf Quint wrote:
On 5/23/2019 2:10 AM, Jinke Fan wrote:
Hi,
This patch adds vendor id detection for Hygon Dhyana CPUs.
Could anyone help me with submit it?
More details can be found on:
http://lkml.kernel.org/r/5ce86123a7b9dad925ac583d88d2f921040e859b.1538583282.git.pu...@hygon.cn
Why would this be needed? I just had to look up what this actually is
and it doesn't seem to be necessary to distinguish between that
particular CPU (quote from Wikipedia):
The initial microprocessor created in 2018 is the Hygon Dhyana
<https://en.wikipedia.org/wiki/AMD_Epyc#Chinese_variants> system on a
chip <https://en.wikipedia.org/wiki/System_on_a_chip>.^[1]
<https://en.wikipedia.org/wiki/AMD%E2%80%93Chinese_joint_venture#cite_note-2018-toms-hardware-1>
^[2]
<https://en.wikipedia.org/wiki/AMD%E2%80%93Chinese_joint_venture#cite_note-2018-phoronix-2>
It is noted to be a variant of the AMD EPYC
<https://en.wikipedia.org/wiki/EPYC> and is so similar that "there is
little to no differentiation between the chips".^[1]
<https://en.wikipedia.org/wiki/AMD%E2%80%93Chinese_joint_venture#cite_note-2018-toms-hardware-1>
It has been noted that there is "less than 200 lines of new kernel
code" for Linux <https://en.wikipedia.org/wiki/Linux> kernel support,
and that the Dhyana is "mostly a re-branded Zen CPU for the Chinese
server market".^[2]
<https://en.wikipedia.org/wiki/AMD%E2%80%93Chinese_joint_venture#cite_note-2018-phoronix-2>
^Are you aware of any specifics of that processor that it would require
a distinction and direct support for that CPU version, beside the geek
factor?
Dhyana process was the first generation of Hygon. And,
"there is little to no differentiation between the chips".
The spec refer to:
https://www.amd.com/system/files/TechDocs/54945_PPR_Family_17h_Models_00h-0Fh.pdf
At the software level, code typically reuses AMD's code path as so far.
Best regards.
Jinke Fan
^Ralf
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