[PATCH v2 0/5] x86/topo: SNC Divination

[Peter Zijlstra]

Hi!

Extend Thomas' MADT time topology code to include SRAT based node counts to
provide a boot time based: topology_num_nodes_per_package().

This provides a best effort estimate for things like Intel CoD/SNC and AMD NPS
modes that are not otherwise enumerated.

Use this measure to address various SNC snafus.

v1: https://lkml.kernel.org/r/20260226104909.675623579@xxxxxxxxxxxxx

---
 arch/x86/include/asm/numa.h           |   6 ++
 arch/x86/include/asm/topology.h       |   6 ++
 arch/x86/kernel/cpu/common.c          |   3 +
 arch/x86/kernel/cpu/resctrl/monitor.c |  36 +------
 arch/x86/kernel/cpu/topology.c        |  13 ++-
 arch/x86/kernel/smpboot.c             | 198 ++++++++++++++++++++++++----------
 arch/x86/mm/numa.c                    |   8 ++
 arch/x86/mm/srat.c                    |   2 +
 8 files changed, 184 insertions(+), 88 deletions(-)