This series prepares cpu_to_coregroup_id() for broader use and enables
coregroup support on PowerNV when firmware exposes the required
associativity information.

The first patch cleans up find_primary_domain_index(). The second makes
cpu_to_coregroup_id() available outside PPC_SPLPAR while preserving the
existing fallback behavior. The final patch detects coregroup support
from the associativity hierarchy and uses it on PowerNV systems.

Changelog from v1: https://lkml.kernel.org/r/20260524010017.140408-1-srikar@linux.ibm.com
- Split into 3 patches
- Handle comments from Christophe Leroy

Srikar Dronamraju (3):
  powerpc/numa: Simplify find_primary_domain_index
  powerpc/numa: Allow cpu_to_coregroup_id without PPC_SPLPAR
  powerpc/numa: Support coregroup on PowerNV

 arch/powerpc/include/asm/topology.h | 15 +++--
 arch/powerpc/mm/numa.c              | 85 ++++++++++++++++++++++-------
 2 files changed, 71 insertions(+), 29 deletions(-)

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2.43.0