x86: add cpu_get_pkg_id() and cpu_get_core_id() topology helpers
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Authored by afscoelho_gmail.com on Jun 23 2026, 2:36 AM.

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Reviewers: None

Summary

Map logical CPU to physical package (socket) id and physical core id by
shifting per-package and SMT-thread bits out of the APIC id. SMT siblings
share a core id.

Lets drivers for per-socket or per-core hardware bind to real topology,
not NUMA domains or logical CPUs. First consumer: AMD RAPL (package
energy MSRs socket-scoped, per-core energy MSR shared by SMT siblings).

Sponsored by: Advanced Micro Devices (AMD)
MFC after: 2 weeks
Signed-off-by: Andre Silva <andasilv@amd.com>

Diff Detail

Repository

rG FreeBSD src repository

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Unit

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Build Status

Buildable 74128
Build 71011: arc lint + arc unit

Event Timeline

afscoelho_gmail.com created this revision.Jun 23 2026, 2:36 AM

Herald added a subscriber: imp. · View Herald TranscriptJun 23 2026, 2:36 AM

afscoelho_gmail.com requested review of this revision.Jun 23 2026, 2:36 AM

Harbormaster completed remote builds in B74125: Diff 180340.Jun 23 2026, 2:36 AM

afscoelho_gmail.com added a child revision: D57759: x86: add AMD RAPL MSR and feature-bit definitions.Jun 23 2026, 2:36 AM

Correct stack onto D55603 and add Co-authored-by trailer for ShengYi Hung.

Harbormaster completed remote builds in B74128: Diff 180343.Jun 23 2026, 2:50 AM

afscoelho_gmail.com mentioned this in D57760: amdrapl: add AMD RAPL energy/power telemetry driver.Jun 23 2026, 2:50 AM

Abandoning: no longer needed. This change added cpu_get_pkg_id()/cpu_get_core_id() topology helpers whose sole consumer was to be the AMD RAPL driver. In the merged hwpmc RAPL class (D58028), the counters are scoped via PMC_CAP_DOMWIDE (one counter per NUMA domain, allocated by pmcstat) rather than by physical package/core topology, so these helpers have no remaining consumer.