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| author | Vishal Badole <Vishal.Badole@amd.com> | 2026-07-21 21:15:14 +0530 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2026-07-23 14:23:47 -0700 |
| commit | 924be9d673eb75deef2f71ddee0d7d89fe69bb7b (patch) | |
| tree | 028d8182ea8c06392cde41970e14c33d2fab5c81 /arch/x86/kernel/acpi | |
| parent | bdb1b1f03b9b1cc1cde7d54f8b5b2f9a6bdda782 (diff) | |
| download | linux-next-924be9d673eb75deef2f71ddee0d7d89fe69bb7b.tar.gz linux-next-924be9d673eb75deef2f71ddee0d7d89fe69bb7b.zip | |
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 <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
Diffstat (limited to 'arch/x86/kernel/acpi')
| -rw-r--r-- | arch/x86/kernel/acpi/cppc.c | 3 |
1 files changed, 2 insertions, 1 deletions
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; |