From 924be9d673eb75deef2f71ddee0d7d89fe69bb7b Mon Sep 17 00:00:00 2001 From: Vishal Badole Date: Tue, 21 Jul 2026 21:15:14 +0530 Subject: x86/topology: Add TOPO_CPU_TYPE_LOW_POWER 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 Signed-off-by: Borislav Petkov (AMD) Link: https://patch.msgid.link/20260721154514.2506972-4-Vishal.Badole@amd.com --- arch/x86/kernel/acpi/cppc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/x86/kernel/acpi') diff --git a/arch/x86/kernel/acpi/cppc.c b/arch/x86/kernel/acpi/cppc.c index b8f5dd0a8117..bbade0da5130 100644 --- a/arch/x86/kernel/acpi/cppc.c +++ b/arch/x86/kernel/acpi/cppc.c @@ -281,8 +281,9 @@ int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator) /* use the max scale for performance cores */ *numerator = CPPC_HIGHEST_PERF_PERFORMANCE; return 0; + case TOPO_CPU_TYPE_LOW_POWER: case TOPO_CPU_TYPE_EFFICIENCY: - /* use the highest perf value for efficiency cores */ + /* use the highest perf value for efficiency and low-power cores */ ret = amd_get_highest_perf(cpu, &tmp); if (ret) return ret; -- cgit v1.2.3