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x86/cpu/AMD: Evaluate smp_num_siblings early 

To support force disabling of SMT it's required to know the number of
thread siblings early. amd_get_topology() cannot be called before the APIC
driver is selected, so split out the part which initializes
smp_num_siblings and invoke it from amd_early_init().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner 2018-06-06 00:57:38 +02:00
parent 119bff8a9c
commit 1e1d7e25fd
1 changed files with 13 additions and 0 deletions
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13
arch/x86/kernel/cpu/amd.c
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@ -315,6 +315,17 @@ static void legacy_fixup_core_id(struct cpuinfo_x86 *c)
c->cpu_core_id %= cus_per_node;
}
static void amd_get_topology_early(struct cpuinfo_x86 *c)
{
if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
u32 eax, ebx, ecx, edx;
cpuid(0x8000001e, &eax, &ebx, &ecx, &edx);
smp_num_siblings = ((ebx >> 8) & 0xff) + 1;
}
}
/*
* Fixup core topology information for
* (1) AMD multi-node processors
@ -681,6 +692,8 @@ static void early_init_amd(struct cpuinfo_x86 *c)
set_cpu_bug(c, X86_BUG_AMD_E400);
early_detect_mem_encrypt(c);
amd_get_topology_early(c);
}
static void init_amd_k8(struct cpuinfo_x86 *c)