Re: [PATCH v7 07/13] hw/386: Add EPYC mode topology decoding functions

[Babu Moger <babu.moger@amd.com>]

On 3/12/20 7:39 AM, Igor Mammedov wrote:
> On Wed, 11 Mar 2020 17:53:34 -0500
> Babu Moger <babu.moger@amd.com> wrote:
> 
>> These functions add support for building EPYC mode topology given the smp
>> details like numa nodes, cores, threads and sockets.
>>
>> The new apic id decoding is mostly similar to current apic id decoding
>> except that it adds a new field node_id when numa configured. Removes all
>> the hardcoded values. Subsequent patches will use these functions to build
>> the topology.
>>
>> Following functions are added.
> [...]
>> x86_topo_ids_from_idx_epyc
> you forgot to remove unused anymore function.
> No need to respin whole series for it though, you can post as reply to
> this patch v8 or do it as a patch on top.

Igor, The function x86_topo_ids_from_idx_epyc(or x86_topo_ids_from_idx) is
still there. We are using it internally now. It is used by
x86_apicid_from_cpu_idx_epyc(or x86_apicid_from_cpu_idx). We removed it as
callback function. So, we are good here. Thanks

> 
> 
> 
> 
> [...]
>>
>> The topology details are available in Processor Programming Reference (PPR)
>> for AMD Family 17h Model 01h, Revision B1 Processors. The revision guides are
>> available from the bugzilla Link below.
>> Link: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.kernel.org%2Fshow_bug.cgi%3Fid%3D206537&amp;data=02%7C01%7Cbabu.moger%40amd.com%7C3d1032fb1cc94a5a197308d7c68268c5%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637196135715465573&amp;sdata=13zSN7AqPGKHFG%2FePmkWTVbwM0qzktrnolEidnNzyhs%3D&amp;reserved=0
>>
>> Signed-off-by: Babu Moger <babu.moger@amd.com>
>> Acked-by: Igor Mammedov <imammedo@redhat.com>
>> Acked-by: Michael S. Tsirkin <mst@redhat.com>
> [...]
>> +static inline void x86_topo_ids_from_idx_epyc(X86CPUTopoInfo *topo_info,
>> +                                              unsigned cpu_index,
>> +                                              X86CPUTopoIDs *topo_ids)
>> +{
>> +    unsigned nr_nodes = MAX(topo_info->nodes_per_pkg, 1);
>> +    unsigned nr_dies = topo_info->dies_per_pkg;
>> +    unsigned nr_cores = topo_info->cores_per_die;
>> +    unsigned nr_threads = topo_info->threads_per_core;
>> +    unsigned cores_per_node = DIV_ROUND_UP((nr_dies * nr_cores * nr_threads),
>> +                                            nr_nodes);
>> +
>> +    topo_ids->pkg_id = cpu_index / (nr_dies * nr_cores * nr_threads);
>> +    topo_ids->node_id = (cpu_index / cores_per_node) % nr_nodes;
>> +    topo_ids->die_id = cpu_index / (nr_cores * nr_threads) % nr_dies;
>> +    topo_ids->core_id = cpu_index / nr_threads % nr_cores;
>> +    topo_ids->smt_id = cpu_index % nr_threads;
>> +}
>> +
>> +/*
> [...]
>