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x86/CPU/AMD: Derive CPU topology from CPUID function 0xB when available 

Derive topology information from Extended Topology Enumeration (CPUID
function 0xB) when the information is available.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1524865681-112110-3-git-send-email-suravee.suthikulpanit@amd.com
This commit is contained in:
Suravee Suthikulpanit 2018-04-27 16:48:01 -05:00 committed by Thomas Gleixner
parent 6c4f5abaf3
commit 3986a0a805
1 changed files with 10 additions and 1 deletions
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11
arch/x86/kernel/cpu/amd.c
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@ -327,6 +327,7 @@ static void amd_get_topology(struct cpuinfo_x86 *c)
/* get information required for multi-node processors */
if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
int err;
u32 eax, ebx, ecx, edx;
cpuid(0x8000001e, &eax, &ebx, &ecx, &edx);
@ -344,6 +345,14 @@ static void amd_get_topology(struct cpuinfo_x86 *c)
c->x86_max_cores /= smp_num_siblings;
}
/*
* In case leaf B is available, use it to derive
* topology information.
*/
err = detect_extended_topology(c);
if (!err)
c->x86_coreid_bits = get_count_order(c->x86_max_cores);
cacheinfo_amd_init_llc_id(c, cpu, node_id);
} else if (cpu_has(c, X86_FEATURE_NODEID_MSR)) {
@ -378,7 +387,6 @@ static void amd_detect_cmp(struct cpuinfo_x86 *c)
c->phys_proc_id = c->initial_apicid >> bits;
/* use socket ID also for last level cache */
per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
amd_get_topology(c);
}
u16 amd_get_nb_id(int cpu)
@ -821,6 +829,7 @@ static void init_amd(struct cpuinfo_x86 *c)
/* Multi core CPU? */
if (c->extended_cpuid_level >= 0x80000008) {
amd_detect_cmp(c);
amd_get_topology(c);
srat_detect_node(c);
}