Re: [PATCH v4 08/16] hw/386: Add EPYC mode topology decoding functions

[Babu Moger]

On 2/24/20 2:50 AM, Igor Mammedov wrote:
> On Thu, 13 Feb 2020 12:17:18 -0600
> Babu Moger <address@hidden> 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 llc_id when numa configured. Removes all
> 
> llc_id/nodes_per_pkg

Good catch. Thanks.

> 
>> the hardcoded values. Subsequent patches will use these functions to build
>> the topology.
>>
>> Following functions are added.
>> apicid_llc_width_epyc
>> apicid_llc_offset_epyc
>> apicid_pkg_offset_epyc
>> apicid_from_topo_ids_epyc
>> x86_topo_ids_from_idx_epyc
>> x86_topo_ids_from_apicid_epyc
>> x86_apicid_from_cpu_idx_epyc
>>
>> The topology details are available in Processor Programming Reference (PPR)
>> for AMD Family 17h Model 01h, Revision B1 Processors.
>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.amd.com%2Fsystem%2Ffiles%2FTechDocs%2F55570-B1_PUB.zip&amp;data=02%7C01%7Cbabu.moger%40amd.com%7C07f6ec6272fa4a0bb44608d7b9069ef6%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637181310409402221&amp;sdata=nPUTNqiXVSihj8mHt%2FO6sSGCL4uTtPsfvIiEJ0WosaM%3D&amp;reserved=0
> 
> also checkpatch doesn't like this patch for too long strings.

Yes. I saw that.  Some are bit tricky. I may need to break the definitions
like this below.

static inline apic_id_t
x86_apicid_from_topo_ids_epyc(X86CPUTopoInfo *topo_info,
                              const X86CPUTopoIDs *topo_ids)


> with that fixed
>   Acked-by: Igor Mammedov <address@hidden>
> 
> 
> PS:
> similar checkpatch warnings should be fixed in preceding patches

Sure. Will take care.
> 
> 
>>
>> Signed-off-by: Babu Moger <address@hidden>
>> ---
>>  include/hw/i386/topology.h |   93 
>> ++++++++++++++++++++++++++++++++++++++++++++
>>  include/hw/i386/x86.h      |    1 
>>  2 files changed, 94 insertions(+)
>>
>> diff --git a/include/hw/i386/topology.h b/include/hw/i386/topology.h
>> index 3158157430..d9319dc2ac 100644
>> --- a/include/hw/i386/topology.h
>> +++ b/include/hw/i386/topology.h
>> @@ -83,6 +83,11 @@ static inline unsigned apicid_die_width(X86CPUTopoInfo 
>> *topo_info)
>>      return apicid_bitwidth_for_count(topo_info->dies_per_pkg);
>>  }
>>  
>> +/* Bit width of the node_id field per socket */
>> +static inline unsigned apicid_node_width_epyc(X86CPUTopoInfo *topo_info)
>> +{
>> +    return apicid_bitwidth_for_count(MAX(topo_info->nodes_per_pkg, 1));
>> +}
>>  /* Bit offset of the Core_ID field
>>   */
>>  static inline unsigned apicid_core_offset(X86CPUTopoInfo *topo_info)
>> @@ -103,6 +108,94 @@ static inline unsigned apicid_pkg_offset(X86CPUTopoInfo 
>> *topo_info)
>>      return apicid_die_offset(topo_info) + apicid_die_width(topo_info);
>>  }
>>  
>> +#define LLC_OFFSET 3 /* Minimum LLC offset if numa configured */
>> +
>> +/* Bit offset of the node_id field */
>> +static inline unsigned apicid_node_offset_epyc(X86CPUTopoInfo *topo_info)
>> +{
>> +    unsigned offset = apicid_die_offset(topo_info) +
>> +                      apicid_die_width(topo_info);
>> +
>> +    if (topo_info->nodes_per_pkg) {
>> +        return MAX(LLC_OFFSET, offset);
>> +    } else {
>> +        return offset;
>> +    }
>> +}
>> +
>> +/* Bit offset of the Pkg_ID (socket ID) field */
>> +static inline unsigned apicid_pkg_offset_epyc(X86CPUTopoInfo *topo_info)
>> +{
>> +    return apicid_node_offset_epyc(topo_info) + 
>> apicid_node_width_epyc(topo_info);
>> +}
>> +
>> +/*
>> + * Make APIC ID for the CPU based on Pkg_ID, Core_ID, SMT_ID
>> + *
>> + * The caller must make sure core_id < nr_cores and smt_id < nr_threads.
>> + */
>> +static inline apic_id_t x86_apicid_from_topo_ids_epyc(X86CPUTopoInfo 
>> *topo_info,
>> +                                                      const X86CPUTopoIDs 
>> *topo_ids)
>> +{
>> +    return (topo_ids->pkg_id  << apicid_pkg_offset_epyc(topo_info)) |
>> +           (topo_ids->node_id << apicid_node_offset_epyc(topo_info)) |
>> +           (topo_ids->die_id  << apicid_die_offset(topo_info)) |
>> +           (topo_ids->core_id << apicid_core_offset(topo_info)) |
>> +           topo_ids->smt_id;
>> +}
>> +
>> +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;
>> +}
>> +
>> +/*
>> + * Calculate thread/core/package IDs for a specific topology,
>> + * based on APIC ID
>> + */
>> +static inline void x86_topo_ids_from_apicid_epyc(apic_id_t apicid,
>> +                                            X86CPUTopoInfo *topo_info,
>> +                                            X86CPUTopoIDs *topo_ids)
>> +{
>> +    topo_ids->smt_id = apicid &
>> +            ~(0xFFFFFFFFUL << apicid_smt_width(topo_info));
>> +    topo_ids->core_id =
>> +            (apicid >> apicid_core_offset(topo_info)) &
>> +            ~(0xFFFFFFFFUL << apicid_core_width(topo_info));
>> +    topo_ids->die_id =
>> +            (apicid >> apicid_die_offset(topo_info)) &
>> +            ~(0xFFFFFFFFUL << apicid_die_width(topo_info));
>> +    topo_ids->node_id =
>> +            (apicid >> apicid_node_offset_epyc(topo_info)) &
>> +            ~(0xFFFFFFFFUL << apicid_node_width_epyc(topo_info));
>> +    topo_ids->pkg_id = apicid >> apicid_pkg_offset_epyc(topo_info);
>> +}
>> +
>> +/*
>> + * Make APIC ID for the CPU 'cpu_index'
>> + *
>> + * 'cpu_index' is a sequential, contiguous ID for the CPU.
>> + */
>> +static inline apic_id_t x86_apicid_from_cpu_idx_epyc(X86CPUTopoInfo 
>> *topo_info,
>> +                                                     unsigned cpu_index)
>> +{
>> +    X86CPUTopoIDs topo_ids;
>> +    x86_topo_ids_from_idx_epyc(topo_info, cpu_index, &topo_ids);
>> +    return x86_apicid_from_topo_ids_epyc(topo_info, &topo_ids);
>> +}
>>  /* Make APIC ID for the CPU based on Pkg_ID, Core_ID, SMT_ID
>>   *
>>   * The caller must make sure core_id < nr_cores and smt_id < nr_threads.
>> diff --git a/include/hw/i386/x86.h b/include/hw/i386/x86.h
>> index d76fd0bbb1..38c2d27910 100644
>> --- a/include/hw/i386/x86.h
>> +++ b/include/hw/i386/x86.h
>> @@ -42,6 +42,7 @@ typedef uint32_t apic_id_t;
>>  
>>  typedef struct X86CPUTopoIDs {
>>      unsigned pkg_id;
>> +    unsigned node_id;
>>      unsigned die_id;
>>      unsigned core_id;
>>      unsigned smt_id;
>>
>