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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 | |
| 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
| -rw-r--r-- | arch/x86/include/asm/processor.h | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/acpi/cppc.c | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/topology_common.c | 3 |
3 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index fc0350fe8f5e..9e8183441888 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -73,6 +73,7 @@ enum x86_topology_cpu_type { TOPO_CPU_TYPE_ANY = 0, TOPO_CPU_TYPE_PERFORMANCE, TOPO_CPU_TYPE_EFFICIENCY, + TOPO_CPU_TYPE_LOW_POWER, TOPO_CPU_TYPE_UNKNOWN, }; 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; diff --git a/arch/x86/kernel/cpu/topology_common.c b/arch/x86/kernel/cpu/topology_common.c index 71b6c33afe0b..581f2fcd7e42 100644 --- a/arch/x86/kernel/cpu/topology_common.c +++ b/arch/x86/kernel/cpu/topology_common.c @@ -44,6 +44,7 @@ enum x86_topology_cpu_type get_topology_cpu_type(struct cpuinfo_x86 *c) switch (c->topo.amd_type) { case AMD_CPU_TYPE_PERFORMANCE: return TOPO_CPU_TYPE_PERFORMANCE; case AMD_CPU_TYPE_EFFICIENCY: return TOPO_CPU_TYPE_EFFICIENCY; + case AMD_CPU_TYPE_LOW_POWER: return TOPO_CPU_TYPE_LOW_POWER; } } @@ -57,6 +58,8 @@ const char *get_topology_cpu_type_name(struct cpuinfo_x86 *c) return "performance"; case TOPO_CPU_TYPE_EFFICIENCY: return "efficiency"; + case TOPO_CPU_TYPE_LOW_POWER: + return "low_power"; default: return "unknown"; } |