diff options
| author | Vishal Badole <Vishal.Badole@amd.com> | 2026-07-21 21:15:13 +0530 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2026-07-23 14:23:27 -0700 |
| commit | bdb1b1f03b9b1cc1cde7d54f8b5b2f9a6bdda782 (patch) | |
| tree | 33996584c995aa565970bbcb4db08249bab44902 | |
| parent | 598ebce64c4cfaca54cbecdc25a7ef56ea701051 (diff) | |
x86/topology: Name the AMD core-type values
Replace the bare 0/1 in get_topology_cpu_type() with named constants that
mirror what the AMD APM publishes for CPUID Fn0x80000026 EBX[31:28] (Extended
CPU Topology, Core Type):
0 - Performance core
1 - Efficient core
2 - Low-power core (used by a follow-up)
No functional change.
Suggested-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Vishal Badole <Vishal.Badole@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260721154514.2506972-3-Vishal.Badole@amd.com
| -rw-r--r-- | arch/x86/include/asm/topology.h | 6 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/topology_common.c | 4 |
2 files changed, 8 insertions, 2 deletions
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h index ef76ba674f1b..1825691af941 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -114,6 +114,12 @@ enum x86_topology_domains { TOPO_MAX_DOMAIN, }; +enum amd_cpu_type { + AMD_CPU_TYPE_PERFORMANCE = 0, + AMD_CPU_TYPE_EFFICIENCY = 1, + AMD_CPU_TYPE_LOW_POWER = 2, +}; + struct x86_topology_system { unsigned int dom_shifts[TOPO_MAX_DOMAIN]; unsigned int dom_size[TOPO_MAX_DOMAIN]; diff --git a/arch/x86/kernel/cpu/topology_common.c b/arch/x86/kernel/cpu/topology_common.c index b9d025f3373a..71b6c33afe0b 100644 --- a/arch/x86/kernel/cpu/topology_common.c +++ b/arch/x86/kernel/cpu/topology_common.c @@ -42,8 +42,8 @@ enum x86_topology_cpu_type get_topology_cpu_type(struct cpuinfo_x86 *c) } if (c->x86_vendor == X86_VENDOR_AMD) { switch (c->topo.amd_type) { - case 0: return TOPO_CPU_TYPE_PERFORMANCE; - case 1: return TOPO_CPU_TYPE_EFFICIENCY; + case AMD_CPU_TYPE_PERFORMANCE: return TOPO_CPU_TYPE_PERFORMANCE; + case AMD_CPU_TYPE_EFFICIENCY: return TOPO_CPU_TYPE_EFFICIENCY; } } |