x86/topology: Add TOPO_CPU_TYPE_LOW_POWER

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AMD heterogeneous parts report a third core type via CPUID Fn0x80000026
EBX[31:28] (Extended CPU Topology, Core Type):

  0 - Performance
  1 - Efficiency
  2 - Low Power

get_topology_cpu_type() only translates the first two, so on parts that ship
low-power cores the third type falls through to TOPO_CPU_TYPE_UNKNOWN.

Add TOPO_CPU_TYPE_LOW_POWER which takes care of this new type.

  [ bp: Massage commit message, zap the "what" explanation. ]

Signed-off-by: Vishal Badole <Vishal.Badole@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260721154514.2506972-4-Vishal.Badole@amd.com

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This commit is contained in:

Vishal Badole 2026-07-21 21:15:14 +05:30 • committed by Borislav Petkov (AMD)

parent bdb1b1f03b

commit 924be9d673

3 changed files with 6 additions and 1 deletions

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1

arch/x86/include/asm/processor.h

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3

arch/x86/kernel/acpi/cppc.c

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3

arch/x86/kernel/cpu/topology_common.c

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