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| author |   Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2018-04-27 16:48:01 -0500 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2018-05-06 12:49:16 +0200 |
| commit | 3986a0a805e668a63fac0ca2cdfa8db951f87c4b (patch) | |
| tree | 629e208932df026543587428bf0ff800c7c45a11 /arch/x86/kernel/cpu/amd.c | |
| parent | x86/CPU: Modify detect_extended_topology() to return result (diff) | |
| download | linux-dev-3986a0a805e668a63fac0ca2cdfa8db951f87c4b.tar.xz linux-dev-3986a0a805e668a63fac0ca2cdfa8db951f87c4b.zip | |
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
Diffstat (limited to 'arch/x86/kernel/cpu/amd.c')
| -rw-r--r-- | arch/x86/kernel/cpu/amd.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index bf27246bb7bd..55361ee04cc5 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -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); } |