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x86: use cpuid vector 0xb when available for detecting cpu topology

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cpuid leaf 0xb provides extended topology enumeration. This interface provides
the 32-bit x2APIC id of the logical processor and it also provides a new
mechanism to detect SMT and core siblings (which provides increased
addressability).

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Suresh Siddha
2008-08-23 17:47:10 +02:00
committed by Ingo Molnar
parent 87ce786ae5
commit bbb65d2d36
6 changed files with 104 additions and 3 deletions
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11
arch/x86/kernel/cpu/intel.c
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@@ -176,9 +176,16 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
if (p)
strcpy(c->x86_model_id, p);
c->x86_max_cores = num_cpu_cores(c);
detect_extended_topology(c);
detect_ht(c);
if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
/*
* let's use the legacy cpuid vector 0x1 and 0x4 for topology
* detection.
*/
c->x86_max_cores = num_cpu_cores(c);
detect_ht(c);
}
/* Work around errata */
Intel_errata_workarounds(c);