Re: [RFC PATCH] x86/cpu/hygon: Fix phys_proc_id calculation logic for multi-die processor

[Pu Wen]

On 2019/3/23 0:52, Peter Zijlstra wrote:
> On Fri, Mar 22, 2019 at 05:44:45PM +0100, Borislav Petkov wrote:
>> On Sat, Mar 23, 2019 at 12:19:01AM +0800, Pu Wen wrote:
>>> That 6 is not a magic number.
>>
>> Well, if I see a naked 6, then it is only magic to me. Now if it were a
>> proper define with a descriptive name...
> 
> Does AMD/Hygon not have a CPUID leaf to read useful things like this
> from?

ApicId[6] is read from CPUID_Fn00000001_EBX[30].
Please see section 2.1.11.1 and 2.1.10.2.1.3 of referrence [1].

Reference:
[1] https://www.amd.com/system/files/TechDocs/54945_PPR_Family_17h_Models_00h-0Fh.pdf

-- 
Regards,
Pu Wen