Re: [PATCH v6 07/10] Revert "hw/386: Add EPYC mode topology decoding functions"

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 31 Aug 2020 13:42:48 -0500
Babu Moger <babu.moger@amd.com> wrote:

> This reverts commit 7568b205555a6405042f62c64af3268f4330aed5.
> 
> Remove the EPYC specific apicid decoding and use the generic
> default decoding.
> 
> Signed-off-by: Babu Moger <babu.moger@amd.com>

Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> ---
>  include/hw/i386/topology.h |  100 --------------------------------------------
>  1 file changed, 100 deletions(-)
> 
> diff --git a/include/hw/i386/topology.h b/include/hw/i386/topology.h
> index 07239f95f4..b9593b9905 100644
> --- a/include/hw/i386/topology.h
> +++ b/include/hw/i386/topology.h
> @@ -47,7 +47,6 @@ typedef uint32_t apic_id_t;
>  
>  typedef struct X86CPUTopoIDs {
>      unsigned pkg_id;
> -    unsigned node_id;
>      unsigned die_id;
>      unsigned core_id;
>      unsigned smt_id;
> @@ -89,11 +88,6 @@ 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)
> @@ -114,100 +108,6 @@ static inline unsigned apicid_pkg_offset(X86CPUTopoInfo *topo_info)
>      return apicid_die_offset(topo_info) + apicid_die_width(topo_info);
>  }
>  
> -#define NODE_ID_OFFSET 3 /* Minimum node_id offset if numa configured */
> -
> -/*
> - * Bit offset of the node_id field
> - *
> - * Make sure nodes_per_pkg >  0 if numa configured else zero.
> - */
> -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(NODE_ID_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.
>