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x86/topology: Name the AMD core-type values

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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
This commit is contained in:
Vishal Badole 2026-07-21 21:15:13 +05:30 committed by Borislav Petkov (AMD)
parent 598ebce64c
commit bdb1b1f03b
2 changed files with 8 additions and 2 deletions
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6
arch/x86/include/asm/topology.h
View File

@ -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];

4
arch/x86/kernel/cpu/topology_common.c
View File

@ -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;
}
}